林昌健

Xiamen University, Amoy, Fujian, China

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Publications (48)30.65 Total impact

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    ABSTRACT: A combined sol-gel and hydrothermal method was developed for preparing a three-dimensional titanate nanowire network film on titanium substrates to achieve an especial photocathodic protection effect for 403 stainless steel. Photopotential measurements were performed to study the protection effect of the film. The results indicated that the titanate film exhibited a special all-dimensional uniform porous structure composed of branched titanate nanowires. When we coupled the steel in a 0.5 M NaCl solution to the titanate film photoanode in a 1.0 M NaOH solution under illumination, its potential decreased by 560 mV. Especially after the light source was cut off, the photopotential of the steel increased by only 50-145 mV, and kept at the lower values than the corrosion potential under dark conditions for over 10 h, indicating that the titanate nanowire network film could produce a striking photocathodic protection effect for 403 stainless steel under illumination and dark conditions. (C) 2010 Elsevier B.V. All rights reserved. National High Technology Research and Development Program of China [2009AA03Z327]; National Natural Science Foundation of China [20473066, 50731004, 21073151]
    Electrochemistry Communications 11/2010; · 4.29 Impact Factor
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    ABSTRACT: A pulse current deposition technique was adopted to construct highly dispersed Ag nanoparticles on TiO2 nanotube arrays which were prepared by the electrochemical anodization The morphology. crystallinity, elemental composition. and UV-vis absorption of Ag/TiO2 nanotube arrays were characterized by scanning election microscopy (SEM). X-ray photoelectron spectroscopy (XPS). X-ray diffraction (XRD). and diffuse reflectance spectra (DRS) In particular. the photoelectrochemical properties and photoelectrocatalytic activity under UV light in actuation and the photocatalytic activity under visible light irradiation for newly synthesized Ag/TiO2 nanotube arrays were investigated The maximum incident photon to charge culler efficiency (IPCE) value of Ag/TiO2 nanotube arrays was 51%, much higher than that of pm e TiO2 nanotube all ays. Ag/TiO2 nanotube arrays exhibited higher photocatalytic activities than the pine TiO2 nanotube arrays under both UV and visible light irradiation The photoelectrocatalytic activity of Ag/TiO2 nanotube arrays under UV light irradiation was 1 6-fold enhancement compared with put e TiO2 nanotube allays This approach can be used in synthesizing various metal-loaded nanotube arrays materials (C) 2010 Elsevier Ltd. All lights reserved Natural Science Foundation of China [20773100]; Technical Program of Fujian Province, China [2007H0031]
    Electrochimica Acta 10/2010; 55(24):7211-7218. · 4.09 Impact Factor
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    ABSTRACT: Scanning electrochemical probes of corrosion potential and chloride ions were developed for the in situ monitoring of localized corrosion processes of reinforcing steel in NaCl-containing solution. The results indicated that the chloride ions (Cl-) preferentially adsorbed and accumulated at the imperfect/defective sites, resulting in initiation and propagation of pitting corrosion on the reinforcing steel surface. An electron microprobe analyzer (EMPA) was used to examine the corrosion morphology and elemental distribution at the corroded location to investigate the origins of the preferential Cl- adsorption and pitting corrosion. By combining the in situ and ex situ images, we concluded that manganese sulfide inclusions in reinforcing steel are the most susceptible defects to pitting corrosion in chloride-containing solution. (C) 2010 Elsevier Ltd. All rights reserved. National Natural Science Foundation of China [20473066, 50731004]; Technology Support Program of China [2007BAB27B04]
    Electrochimica Acta 09/2010; · 4.09 Impact Factor
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    ABSTRACT: Highly ordered nitrogen-doped titanium dioxide (N-doped TiO2) nanotube array films with enhanced photocatalytic activity were fabricated by electrochemical anodization, followed by a wet immersion and annealing post-treatment. The morphology, structure and compostition of the N-doped TiO2 nanotube array films were investigated by FESEM, XPS, UV-vis and XRD. The effect of annealing temperature on the morphology, structures, photoelectrochemical property and photo-absorption of the N-doped TiO2 nanotube array films was investigated. Liquid chromatography and mass spectrometry were applied to the analysis of the intermediates coming from the photocatalytic degradation of MO. The experimental results showed that there were four primary intermediates existing in the photocatalytic reaction. Compared with the pure TiO2 nanotube array film, the N-doped TiO2 nanotubes exhibited higher photocatalytic activity in degradating methyl orange into non-toxic inorganic products under both UV and simulated sunlight irradiation. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved. National Research Foundation of the Singapore Government [MEWR651/06/160]; National Nature Science Foundation of China [20773100, 51072170, 21021002]; National Basic Research Program of China (973 Program) [2007CB935603]
    01/2010;
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    ABSTRACT: An ultrafast and template-free method to synthesize three-dimensional (3D) hierarchical layered titanate microspherulite (TMS) particles with high surface area is reported. The synthesis makes use of an electrochemical spark discharge spallation (ESDS) process, during which a fast anodic reaction on the titanium surface creates a layer of titanium dioxide that instantly breaks down by the applied electrical field into the solution in the form of titanium oxide particles. The spalled particles readily react with the heated NaOH electrolyte to form the titanate particles. A typical as-prepared TMS with a diameter of 0.4 similar to 1.5 mu m is synthesized by ESDS of Ti foils in 10 M NaOH solution under an applied current density of 0.5 A cm(-2), leading to a reaction yield of approximately 0.10 similar to 0.15 g per square centimetre of exposed Ti foil within 20 min. After hydrogen ion exchange, the surface area can reach as high as similar to 406 m(2) g(-1). On the Ti surface, a crystalline rutile TiO2 nanosheet structure is formed, which is attributed to the local exothermic heat caused by the spark discharge. A formation mechanism of the TMS is discussed based on field emission scanning electron microscopy (FESEM), a transmission electron microscopy (TEM) study and Raman scattering spectroscopy analysis. The as-prepared TMS shows excellent adsorption performance compared with a titanate micro-particle (TMP), nanowire (TNW) and nanotube (TNT) when methylene blue (MB) and Pb-II ions are used as representative organic and inorganic pollutants. The mechanism of adsorption has also been discussed. National Research Foundation of Singapore Government [MEWR651/06/160]
    01/2010;
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    ABSTRACT: A TiO2 film was synthesized on the surface of a Ti substrate by a hydrothermal method, followed by acid treatment and calcination. The properties of the TiO2 film were characterized by scanning electron microscopy, X-ray diffraction, and ultraviolet-visible spectrophotometry. The photogenerated cathodic protection properties of the TiO2 film were investigated by electrochemical techniques. The corrosion performance of 403 stainless steel coupled to a TiO2 film photoanode in different solutions was evaluated by photogenerated potential and electrochemical impedance spectroscopy. The results showed that the TiO2 film was composed of many randomly. oriented anatase nanowires of about 10 nm in diameter. The TiO2 nanowire film prepared by the hydrothermal reaction at 150 degrees C for 6 h was used for the photogenerated cathodic protection of 403 stainless steel. When we coupled the steel in a 0.5 mol.L-1 NaCl solution to the TiO2 film photoanode in a mixed solution containing 0.3 mol.L-1 Na2SO4 and 0.5 mol.L-1 HCOOH, its potential decreased by 545 mV. Additionally, the charge transfer resistance of the electrode reaction process for the coupled steel decreased considerably. The results also indicated that the HCOOH in the mixed solution improved the photogenerated cathodic protection of the TiO2 film photoanode. National High Technology Research and Development Program of China [2009AA03Z327]; National Key Technology R&D Program of China [2007BAB27B04]
    ACTA PHYSICO-CHIMICA SINICA 01/2010; · 0.87 Impact Factor
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    ABSTRACT: In the current work, pulse current deposition has been used to prepare evenly distributed and uniformly sized Ag nanoparticles on a TiO2 nanotube array photoelectrode. The Ag particle size and loading were controlled by the pulse deposition time. The Ag/TiO2 nanotube arrays were characterized by SEM, TEM, XRD, XPS and UV-vis diffuse reflection absorption. The resulting electrode contained intimately coupled, three-dimensional Ag/TiO2 structures with greatly improved photocurrent generation and charge transfer compared to a two-dimensional random Ag particle layer deposited directly on top of the nanotube array by the regular photoinduction method. A model mechanism is proposed to illustrate the uniform Ag nanoparticle deposition via the new deposition technique developed in the current work that promotes the uniform distribution of the Ag particles whilst minimizing their deposition at tube entrances, thus effectively preventing the pores from becoming clogged. National Research Foundation of Singapore Government [MEWR 651/06/160]; National Nature Science Foundation of China [20773100, 20620130427]; National Basic Research Program of China (973 Program) [2007CB935603]; R&D of Fujian and Xiamen [2007H0031, 3502Z20073004]
    01/2010;
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    ABSTRACT: An enhanced hydrogen production by photoelectrocatalytic water splitting was obtained using extremely highly ordered nanotubular TiO2 arrays in this work. Highly ordered TiO2 nanotube arrays with a regular top porous morphology were grown by a facile and green three-step electrochemical anodization. The well ordered hexagonal concaves were uniformly distributed on titanium substrate by the first anodization, served as a template for further growth of TiO2 nanotubes. As a result, the TiO2 nanotube arrays constructed through the third anodization showed appreciably more regular architecture than that of the sample by conventional single anodization under the same conditions. The enhanced photoelectrochemical activity was demonstrated through the hydrogen generation by photoelectrocatalytic water splitting, with an exact H-2 evolution rate up to 420 mu mol h(-1) cm(-2) (10 mL h(-1) cm(-2)) in 2 M Na2CO3 + 0.5 M ethylene glycol. The photocurrent density of the third-step anodic TiO2 nanotubes is about 24 mA cm(-2) in 0.5 M KOH, which is 2.2 times higher than that of the normal TiO2 nanotubes (similar to 11 mA cm(-2)) by a single electrochemical anodization. (C) 2010 Elsevier Ltd. All rights reserved. National Natural Science Foundation of China [20773100, 20620130427]; National Basic Research Program of China [2007CB935603]; MOST [2007DFC40440]; National High Technology Research and Development Program of China [2009AA03Z327]
    Electrochimica Acta 01/2010; · 4.09 Impact Factor
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    ABSTRACT: Correlation between the cluster energy and its population and dynamics can provide a better understanding of the complicated energy landscape of disordered metallic systems. We propose a method to analyze the cluster energy distribution for different kinds of short-range order (local clusters) in liquid and glass systems. By applying this analysis to an interesting and important glass forming system-Cu64.5Zr35.5 we observe a direct correlation between the energy and dynamics of the cluster in this realistic glass-forming system. This study suggests that dynamic arrest originates from the environment-dependent energetics of local clusters. (C) 2010 American Institute of Physics. [doi:10.1063/1.3464164] National Natural Science Foundation of China [20773100]
    01/2010;
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    ABSTRACT: Based on surface molecule self. assembly and photocatalytic lithography techniques, superhydrophilic/superhydrophobic micropatterns were fabricated on TiO2 films. Micropatterned calcium phosphate (CaP) films were successfully fabricated by the as-prepared superhydrophilic/superhydrophobic template combined with the electrochemical deposition method. Scanning electron microscopy (SEM) and electron probe microanalysis (EPMA) indicated that micropatterned CaP films with a high spatial resolution could be constructed using the superhydrophilic/superhydrophobic micropatterns as templates. In vitro MG-63 cell tests of the micropatterned CaP films showed that the cells selectively adhered to the tiny CaP film units, which is promising for the control of the adherent growth of the cells on the tiny units and to achieve a high throughput evaluation of the cell behavior. National Natural Science Foundation of China [20620130427, 20773100]; National Key Basic Research Program of China (973) [2007CB935603]; Ministry of Science and Technology of China [2007DFC40440]
    ACTA PHYSICO-CHIMICA SINICA 01/2010; · 0.87 Impact Factor
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    ABSTRACT: An in-situ atomic force microscope (AFM), optical microscope and electrochemical noise (ECN) techniques were applied to the investigation of corrosion initiations in an early stage of 1Cr18Ni9Ti stainless steel immersed in 0.5 M HCl solution. The electrochemical current noise data has been analyzed using discrete wavelet transform (DWT). For the first time, the origin of wavelet coefficients is discussed based on the correlation between the evolution of the energy distribution plot (EDP) of wavelet coefficients and topographic changes. It is found that the occurrence of initiation of metastable pitting at susceptive sites is resulted from the reductive breakdown of passive film of stainless steel in the diluted HCL solution. The coefficients d(4)-d(6) are originated from metastable pitting, d(7) represents the formation and growth of stable pitting while d(8) corresponds to the general corrosion. (C) 2009 Elsevier Ltd. All rights reserved. Natural Science Foundation of China [50731004]; Technology Support Program of China [2007BAB27B04]
    11/2009;
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    ABSTRACT: Vertically aligned TiO2 nanotube (VATN) array micropatterns were fabricated based on a versatile superhydrophilic-superhydrophobic template. Scanning electron microscopy, optical microscopy, and an electron probe microanalyzer were systematically used to confirm the successful fabrication of the dual-scale (micro-/nanoscale) patterns and characterize their structure and morphology. The fabrication of the VATN patterning employed a simple photocatalytic lithography technique and mild reaction conditions at low temperature in the absence of a photoresist and a harmful chemical catalyst. This large-area dual-scale pattern based on the superhydrophilic-superhydrophobic template is expected to be a promising candidate for many applications in a broad range of scientific and technological areas, such as sensor arrays and optoelectronic devices. (C) 2009 The Electrochemical Society. [DOI: 10.1149/1.3216032] All rights reserved. National Natural Science Foundation of China [50571085, 20620130427]; National Basic Research Program of China [2007CB935603, 2007DFC40440]
    Journal of The Electrochemical Society 11/2009; · 2.86 Impact Factor
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    ABSTRACT: The correlation of localized corrosion behavior and microstructure of reinforcement steel in simulated concrete pore solutions was investigated. The SEM/EDS analysis showed that most of ferrite, minor amount of pearlite and some MnS inclusions existed on the steel surface. The SKPFM results indicated a higher corrosion tendency at the ferrite grain boundaries, pearlite grains and MnS inclusions. The EIS and electrochemical polarization measurements demonstrated the influence of pH and chloride concentration on the corrosion behavior. in situ optical observations and AFM images revealed a detail of the localized corrosion behavior, which was in good agreement with the results from the other measurements. (C) 2009 Elsevier Ltd. All rights reserved. National Natural Science Foundation of China [50731004]; Technology Support Programs of China [2007BAB27B04-N43M]
    Corrosion Science 09/2009; · 3.62 Impact Factor
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    ABSTRACT: In this work, the electrochemical deposition behavior of calcium phosphate coating from an aqueous electrolyte containing very dilute calcium and phosphorus species (Ca-P) was studied. The effects of three process parameters, i.e. temperature, current density and duration, were systematically investigated and the underlying mechanism was thoroughly analyzed. It was observed that the coating is mainly composed of hydroxyapatite (HA) in a wide range of temperature and current densities. The temperature had a significant effect on the deposition velocity. An apparent activation energy of 174.9 kJ mol(-1) was subsequently derived, indicating the mass-transfer control mechanism for the coating formation. The current density was identified to be an important parameter for structure controllability. The results of DR-FTIR/Raman spectroscopic studies of the initial deposition phase strongly suggested that the HA coating was instantaneously and directly precipitated on the substrate; neither induction period nor precursor was detected in this dilute Ca-P electrolyte system. Finally, a phase diagram of the Ca-P electrolyte system was constructed, which offered a thermodynamic reason for the direct single-phase HA precipitation observed only in this system. but not in conventional concentrated systems. (C) 2009 Elsevier B.V. All rights reserved. National Science Foundation of China [20773100, 20620130427]; National Basic Research Program of China [2007CB935603]
    Materials Chemistry and Physics 06/2009; · 2.07 Impact Factor
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    ABSTRACT: A spongelike nanostructured titanium dioxide (TiO2) film was fabricated on a titanium substrate by electrochemical anodic oxidation. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) experiments were performed to characterize the morphology and crystalline phase of the spongelike nanostructured TiO2 films. The effect of anodizing time on the thickness of the layers was examined. The relationship between the thickness of the spongelike nanostructured TiO2 film and its photocatalytic activity was investigated by the degradation of methyl orange solution. Results showed that the spongelike nanostructured TiO2 film had a high photocatalytic activity. The photocatalytic degradation rate of a methyl orange solution increased with the film thickness. The photocatalytic degradation rate by the spongelike nanostructured TiO2 film with a thickness of 2.2 mu m was 64 times as large as that by the spongelike nanostructured TiO2 film with a thickness of 480 nm. Natural Science Foundation of Fujian Province, China [U0750015]; Technical Programs of Fujian Province
    ACTA PHYSICO-CHIMICA SINICA 01/2009; · 0.87 Impact Factor
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    ABSTRACT: The self-corrosion rate, anodic dissolution rate, and passivating tendency of a zinc anode are important parameters that affect the performance of alkaline batteries. Effects of the addition of Carbopol resin to the electrolyte and the addition of passivation Bi passivation to the electrodes on the electrochemical behavior of Zn electrodes were investigated by linear polarization and chronopotentiometry. Surface morphologies of Zn electrodes and Zn-Bi alloy electrodes after etched and constant current dissolution were examined using a metallographic microscope and environmental scanning electron microscope (ESEM). Results showed that the addition of Carbopol resin significantly enhanced the polarization resistance, decreased the self-corrosion current, led to a positive shift in anodic dissolution potential, remarkably increased the anodic overpotential and promoted the passivation of alloy electrodes. The addition of Bi markedly improved the oxide film morphology and mass transfer between solid-liquid interfaces, decreased the self-corrosion rate of Zn electrodes and inhibited the self-corrosion process in Zn electrodes. National Natural Science Foundation of China [50731004]; National Sci-Tech Supporting Program of China [2007BAB27B04-N43CTT]
    ACTA PHYSICO-CHIMICA SINICA 01/2009; · 0.87 Impact Factor
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    ABSTRACT: The scanning micro-reference electrode (SMRE) technique was used to study the corrosion behavior of reinforcing steel in simulated concrete pore (SCP) solutions with different pH values. The early stage as well as the propagation of the localized corrosion of reinforcing steel in different solutions was explored. The results indicated that the potential distribution on the reinforcing steel surface changed in home-ostasis and the steel remained passive in the pure simulated concrete pore solution. The solution pH had a significant effect on the localized corrosion of reinforcing steel, and the critical pH value for localized corrosion of reinforcing steel in SCP solutions was between 11.46 and 11.31. (C) 2009 Elsevier Ltd. All rights reserved. National Natural Science Foundation of China [20473066,50731004]; National Key Technology RD Program [2007BAB27B04]
    01/2009;
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    ABSTRACT: A constant current electrochemical deposition was employed to incorporate CdS nanoparticles into the TiO2 nanotube arrays (TiO2NTs). The size and amount of CdS nanoparticles in TiO2NTs (CdS@TiO2NTs) were controllable via modulating current, deposition time and electrolyte concentration. It was revealed, from the scanning electron microscopy (SEM) images and X-ray photoelectron spectroscopy (XPS) in depth profile, that CdS nanoparticles were filled into TiO2 nanotubes. A shift of the absorption edge toward the visible region under the optimal electrodeposition condition was observed with the diffuse reflectance spectroscopy (DRS). A 5-fold enhancement in the photocurrent spectrum for TiO2NTs was observed and the photocurrent response range was significantly extended into the visible region because of the CdS incorporation. Compared with pure TiO2NTs, under a visible light irradiation, CdS@TiO2NTs exhibited a 3.5-fold improvement of photocatalytic activity, which was demonstrated by the photocatalytic decomposition of Rhodamine B (RhB). National Natural Science Foundation of China [50571085]; Natural Science Foundation of Fujian Province [U0750015]; R&D Program of Fujian [2007H0031]; Xiamen [3502Z20073004]
    Science in China Series B Chemistry 01/2009; · 1.20 Impact Factor
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    ABSTRACT: A net-like structured TiO2. film was obtained with a low-temperature hydrothermal process, followed by acid washing and calcination in air. The photoelectrochemical properties of the net-like structured TiO2. film coupled to 316L stainless steel (SS) for corrosion protection application in 3.5% NaCl solution were investigated and compared with the TiO2 nanotube (TN) array prepared by electrochemical anodization. The TiO2. films prepared by two different techniques were examined using SEM, Raman, XPS, photopotential variation with time, polarization measurements as well as EIS. It is found that the TiO2. films with different surface morphologies in a comparable. film thickness range both offer a distinctly photogenerated cathode protection for 316L SS under the white light illumination. The results have been discussed in terms of the structure of TiO2. film and its performance of photogenerated cathode protection. (C) 2008 Elsevier B. V. All rights reserved. National Nature Science Foundation of China [50571085, 20773100]; Fujian Province [2005HZ01-3, 2007H0031]
    01/2008;
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    ABSTRACT: The inhibition action and adsorption behavior of an environment-friendly inhibitor poly-aspartate (PASP) on copper in aqueous NaCl (0.02%) solution were investigated by means of electrochemical techniques. The results indicated that the best inhibition efficiency of PASP was 78.3% with the concentration of 15 mg center dot L-1 at 20 degrees C. The adsorption of PASP prevented Cu from being corroded and PASP was an anodic inhibitor. The inhibition efficiency of PASP decreased with the increase in solution temperature, it decreased to 40.4% at 50 degrees C. The adsorption behavior of PASP followed Langmuir isotherm, it was spontaneous and exothermic, and belonged to chemical adsorption.
    ACTA PHYSICO-CHIMICA SINICA 01/2008; · 0.87 Impact Factor