Baolian Yi

Chinese Academy of Sciences, Peping, Beijing, China

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Publications (234)946.02 Total impact


  • No preview · Article · Feb 2016
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    ABSTRACT: In this study, a novel porous hydrophilic acetylene black plate (HABP), possessing water permeability and gas-blocking properties, is employed as a water transport plate with which to improve the performance of a proton exchange membrane fuel cell under low-humidity. Porosity, tortuosity, hydrophilic pore size, hydrophilic pore fraction and wettability of the HABPs which may influence the permeated water flux, are measured by mercury intrusion, weighing and contact angle methods. By introducing nano-sized hydrophilic acetylene black (HAB) powders into the HABPs, the porosity, hydrophilic pore fraction and wettability increase, while the tortuosity and hydrophilic pore size decrease, which results in higher permeated water flux. By employing the HABP as an anode plate, the maximum power density of the cell is 194.3 mW cm-2 higher than that with a conventional solid plate. The favorable performance of the cell indicates that the HABP is a promising plate material for water transportation.
    No preview · Article · Jan 2016 · Journal of Power Sources
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    ABSTRACT: An appropriate water balance between membrane dehydration and water flooding is essential to improve the performance and endurance of the polymer electrolyte membrane fuel cell (PEMFC). In this study, a novel hydrophilic porous carbon plate (HPCP) is employed as a water transport plate (WTP) to achieve the water balance by virtue of its humidification and water drainage functions. The HPCP is fabricated by electrochemically assisted self-assembly of a hydrophilic silica film on the pore surface of a porous carbon plate (PCP). To overcome the problem that the precursor is unable to enter the hydrophobic pores of the PCP, a novel electro-deposition device forcing the precursor to flow through the pores is designed. Consequently, continuous hydrophilic pores are obtained which promotes the ability of humidification and water drainage. Owing to the humidification function of the HPCP, at the current density of 1000 mA cm−2, the voltage of the cell with HPCP is 270 mV higher than that with solid plate (SP) under no-humidity. Attributed to the water drainage function, the runtime of the cell is twelve times longer than that with SP under dead-ended cathode operation.
    No preview · Article · Jan 2016
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    ABSTRACT: Antimony doped tin oxide (ATO), a kind of semiconducting nanocrystalline material, has excellent electrochemical stability but poor electrical conductivity. Herein, ATO nanocomposites with carbon coatings are prepared by immersing ATO nano-material into dopamine solution, and then thermal treatment to improve the electrical conductivity of the ATO material. The morphology and microstructure of ATO@C/N nanocomposites are characterized using a scanning electron microscope and transmission electron microscopy. The GDLs with the MPL prepared from ATO@C/N nanocomposites are characterized by through-plane resistance testing, mercury intrusion porosimetry and surface contact angle measurement. The results of the above show that ATO@C/N nanocomposites with a 2.16 nm thick carbon coating enhance the electrical conductivity of ATO nanocrystals and exhibit higher electrochemical stability. Further, the performance of MEA fabricated with ATO@C/N as the cathode MPL is evaluated. The maximum power density approaches 1000 mW cm−2, and a slight difference in cell performance is observed compared to XC-72.
    No preview · Article · Dec 2015 · RSC Advances
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    ABSTRACT: In this paper, antimony doped tin oxide (ATO) was firstly used as a conductive material in the microporous layer (MPL). ATO had higher electrochemical stability than XC-72 carbon powder. With the same thickness of MPL, the electrochemical corrosion behavior of gas diffusion layers (GDLs) prepared with ATO and XC-72 carbon powder in the simulated PEMFC operation environment were examined and the results showed that the GDL prepared with ATO had higher durability after oxidation for 55 h. Besides, the fuel cell performance with the GDLs prepared with ATO and XC-72 carbon powder as the cathode GDLs were evaluated and a very small difference between those two cells was observed at low current densities, which demonstrated that GDL prepared with ATO had wide application prospects.
    No preview · Article · Nov 2015 · Journal of electroanalytical chemistry
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    ABSTRACT: The depressing oxygen reduction reaction (ORR) performance has impeded the commercialization of proton exchange membrane fuel cells. As a surface-sensitive reaction, the surface structure of the electrocatalyst has a crucial impact on the ORR. Herein, Pt nanoparticle surfaces were modified with the aid of Ag, which was deposited on the surface of Pt nanoparticles and was etched away through cyclic voltammetry (CV). After surface modification, the step density of the Pt nanoparticles was observed to decrease, according to high-resolution transmission electron microscopy images, which could contribute to the positive shift of the Pt4f binding energy and the improved ability to prevent Pt from being oxidized, as seem by using X-ray photoelectron spectroscopy. Furthermore, the peak potential increase for the surface metal-oxide reduction during CV was consistent with the impact of the step density reduction. After surface modification, the Pt nanoparticles showed improved ORR performance, according to half-cell tests. At the atomic scale, the decrease in the number of low-coordination atoms on the surface steps, which exhibit stronger interactions with Oads/OHads compared with atoms on terraces, could lead to the enhanced ORR performance.
    No preview · Article · Oct 2015
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    ABSTRACT: Antimony-doped tin oxide (ATO) nanoparticles are synthesized by a simple one-step hydrothermal method. The oxygen reduction reaction (ORR) activity of the PtPd/C catalyst is promoted by the presence of ATO. Moreover, after accelerated durability testing, the PtPd/C-ATO catalyst reserves most of its electrochemically active surface area (ESA) and ORR activity compared to the PtPd/C catalyst. The improved electrochemical stability and activity of PtPd/C-ATO is attributed to the high stability of ATO support and the strong interaction between Pt and ATO.
    No preview · Article · Aug 2015 · RSC Advances
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    ABSTRACT: Abstract Development of anion exchange membrane (AEM) with high conductivity, good dimensional stability, desirable toughness and long life-time simultaneously is still a challenge for the practical application of AEM fuel cells. Herein, a novel AEM (denoted as PBI-c-PVBC/OH) is fabricated by applying polybenzimidazole (PBI) and 1,4-diazabicyclo (2.2.2) octane (DABCO) as the macromolecular crosslinker and quaternizing reagent for poly(vinylbenzyl chloride) (PVBC), respectively. With the aid of crosslinking by PBI, PBI-c-PVBC/OH exhibits good flexibility and strength both in dry and water-saturated state. Moreover, high hydroxide conductivity (>25 mS cm-1 at room temperature) and low swelling ratio (∼13%) is obtained, especially the swelling ratio nearly does not increase with temperature. The membrane is also advanced for the superior chemical stability in alkaline environment due to the stable polymer backbone and ionic conductive group (only one nitrogen atom in a DABCO molecule is quaternized). Furthermore, a peak power density of 230 mW cm-2 at 50 °C is obtained on the H2/O2 fuel cell using PBI-c-PVBC/OH, and the membrane presents high durability both in the constant current and continuous open circuit voltage testing. Therefore, it is considered that the PBI crosslinking together with DABCO quaternization can be regarded as a promising strategy in the development of AEM for fuel cells.
    No preview · Article · Jul 2015 · Journal of Power Sources
  • Rong Xue · Jingwang Yan · Liang Jiang · Baolian Yi
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    ABSTRACT: A lithium titanate (Li4Ti5O12)/graphene composite (LTO/graphene) is fabricated with a one-pot sol–gel method. Graphite oxide is dispersed in an aqueous solution of lithium acetate and tetrabutyl titanate followed by heat treatment in H2/Ar. The LTO/graphene composite with reduced aggregation and improved homogeneity is investigated as an anode material for electrochemical capacitors. Electron transport is improved by the conductive graphene network in the insulating Li4Ti5O12 particles. The charge transfer resistance at the particle/electrolyte interface is reduced from 83.1 Ω to 55.4 Ω. The specific capacity of LTO/graphene composite is 126 mAh g−1 at 20C. The energy density and power density of a hybrid electrochemical supercapacitor with a LTO/graphene negative electrode and an activated carbon positive electrode are 120.8 Wh kg−1 and 1.5 kW kg−1, respectively, which is comparable to that of conventional electrochemical double layer capacitors (EDLCs). The LTO/graphene composite fabricated by the one-pot sol–gel method is a promising anode material for hybrid electrochemical supercapacitors.
    No preview · Article · May 2015 · Materials Chemistry and Physics
  • H. Leng · B. Yi · Q. Xie · L. Tang · Z. Gong
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    ABSTRACT: The response nonuniformity of uncooled infrared focal plane arrays is very similar to the stripe noise. Scene-based nonuniformity correction algorithm is an effective way to enhance the image quality and compensate the response drift. Based on the study of moment matching theory, a novel temporal moment matching nonuniformity correction algorithm is proposed. In the proposed algorithm, changing column is identified by the adjacent frames after moment matching, the correction coefficients are updated adaptively in temporal domain. The experimental results with the real infrared video sequences have shown that the proposed algorithm can significantly increase the convergence speed and reduce the ghosting artifacts.
    No preview · Article · Apr 2015
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    ABSTRACT: The effect of mass transport on the growth characteristics of large-area vapor-grown carbon nanofibers (CNFs) was investigated by adjusting the substrate deposition angle (α). The catalyst precursor solution was coated onto one side of the 2D porous carbon paper substrate via a decal printing method. The results showed that the CNFs were grown on only one side of the substrate and α was found to significantly affect the growth uniformity. At α = 0°, the growth thickness, the density, the microstructure and the yield of the CNF film were uniform across the substrate surface, whereas the growth uniformity deceased with increasing α, suggesting that the large-area CNF deposition processes were mass-transport-controlled. Computational fluid dynamics simulations of the gas diffusion processes revealed the homogeneous distributions of the carbon-source-gas concentration, pressure, and velocity near the substrate surface at α = 0°, which were the important factors in achieving the mass-transport-limited uniform CNF growth. The homogeneity of the filed distributions decreased with increasing α, in accordance with the variation in the growth uniformity with α. When used as a micro-porous layer, the uniform CNF film enabled higher proton exchange membrane fuel cell performance in comparison with commercial carbon black by virtue of its improved electronic and mass-transport properties confirmed by the electrochemical impedance spectroscopy results.
    No preview · Article · Mar 2015 · Nanoscale
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    ABSTRACT: In this paper, 1,2,4-triazolium methanesulfonate (C2H4N3+CH3SO3-, [Tri][MS]), an ionic conductor, was successfully synthesized. It exhibited high ionic conductivity of 18.60 mS·cm-1 at 140℃ and reached up to 36.51 mS·cm-1 at 190℃. [Tri][MS] was first applied to modify Nafion membrane to fabricate [Tri][MS]/Nafion membrane by impregnation method at 150℃. The prepared composite membrane showed high thermal stability with decomposed temperature above 200℃ in air atmosphere. In addition, the membrane indicated good ionic conductivity with 3.67 mS·cm-1 at 140℃ and reached up to 13.23 mS·cm-1 at 180℃. The structure of the [Tri][MS] and the composite membrane were characterized by FTIR and the compatibility of [Tri][MS] and Pt/C catalyst was studied by a cyclic voltammetry (CV) method. Besides, the [Tri][MS]/Nafion membrane (thickness of 65 μm) was evaluated with single fuel cell at high temperature and without humidification. The highest power density of [Tri][MS]/Nafion membrane was 3.20 mW·cm-2 at 140℃ and 4.90 mW·cm-2 at 150℃, which was much higher than that of Nafion membrane.
    Full-text · Article · Mar 2015 · Journal of Energy Chemistry
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    ABSTRACT: Fe3+ is a sort of common metal ion contaminant for the solid polymer electrolyte (SPE) water electrolyser. In this paper, the effect of Fe3+ on the performance of SPE water electrolyser has been investigated by both in-situ and ex-situ characterizations. The electron probe microanalysis and ultraviolet test results showed that Fe3+ could migrate from the anode to the cathode and mostly be reduced to Fe2+ in the cathode rather than occurred underpotential deposition as described in the previous report. The in-situ dynamic contamination test showed that the anode voltage increased sharply as soon as the Fe3+ was fed into the anode, while the cathode voltage kept constant until the contamination time was over 30 minutes, indicating the higher tolerance of the cathode than the anode for the Fe3+ contamination. The calculation results based on the electrochemistry impedance spectroscopy test results revealed that the striking increase of the electrolysis voltage was mainly attributed to the ohmic overpotential, which was due to the replacement of H+ by Fe3+ in the Nafion resin. Interestingly, the voltage lagged behind the current for several minutes in the multi-current-step test for the contaminated electrolyser, which phenomenon may be used for judging whether the SPE water electrolyser performance degradation is due to the metal ions contamination. Furthermore, recovery strategy has been developed, and it was found that the contaminated electrolyser could be mostly recovered by 0.5 M H2SO4 solution treatment for 13 h.
    No preview · Article · Mar 2015 · Electrochimica Acta
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    ABSTRACT: Fe3+ is a sort of common metal ion contaminant for the solid polymer electrolyte (SPE) water electrolyser. In this paper, the effect of Fe3+ on the performance of SPE water electrolyser has been investigated by both in-situ and ex-situ characterizations. The electron probe microanalysis and ultraviolet test results showed that Fe3+ could migrate from the anode to the cathode and mostly be reduced to Fe2+ in the cathode rather than occurred underpotential deposition as described in the previous report. The in-situ dynamic contamination test showed that the anode voltage increased sharply as soon as the Fe3+ was fed into the anode, while the cathode voltage kept constant until the contamination time was over 30 minutes, indicating the higher tolerance of the cathode than the anode for the Fe3+ contamination. The calculation results based on the electrochemistry impedance spectroscopy test results revealed that the striking increase of the electrolysis voltage was mainly attributed to the ohmic overpotential, which was due to the replacement of H+ by Fe3+ in the Nafion resin. Interestingly, the voltage lagged behind the current for several minutes in the multi-current-step test for the contaminated electrolyser, which phenomenon may be used for judging whether the SPE water electrolyser performance degradation is due to the metal ions contamination. Furthermore, recovery strategy has been developed, and it was found that the contaminated electrolyser could be mostly recovered by 0.5 M H2SO4 solution treatment for 13 h.
    No preview · Article · Mar 2015 · Electrochimica Acta
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    ABSTRACT: Pt/WO3/C nanocomposites with parallel WO3 nanorods were synthesized and applied as the cathode catalyst for proton exchange membrane fuel cells (PEMFCs). Electrochemical results and single cell tests show that an enhanced activity for the oxygen reduction reaction (ORR) is obtained for the Pt/WO3/C catalyst compared with Pt/C. The higher catalytic activity might be ascribed to the improved Pt dispersion with smaller particle sizes. The Pt/WO3/C catalyst also exhibits a good electrochemical stability under potential cycling. Thus, the Pt/WO3/C catalyst can be used as a potential PEMFC cathode catalyst.
    No preview · Article · Jan 2015 · Journal of Energy Chemistry
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    ABSTRACT: An oriented ultrathin catalyst layer (UTCL) has been prepared for fuel cells application based on the high electrical conductivity TiO2 nanotube (TNTs). The electrical conductivity of TNTs was improved by the deposited C via a plasma enhanced chemical vapor deposition (PECVD) technique. Pt catalysts were deposited on the high electrical conductivitve TNTs by the radio frequency (RF) sputtering to form the oriented C-TNTs-Pt electrode. The mass activity of C-TNTs-Pt-1 at 0.85 V was about 0.44 A mgPt−1. The prepared oriented UTCL based on the C-TNTs-Pt electrode displayed a maximum power density of 206 and 305 mW cm−2 at an ultralow Pt loading resulting in a relatively high Pt utilization of 8.3 and 6.0 kW g−1Pt. A 2D symmetry model based on the parameters of the oriented UTCL was established. In the model, the performance of fuel cell was improved along with the decreasing of CL thickness. Meanwhile, it is found that there is little effect on the cell performance when the electrical conductivity of CL is larger than 3 S cm−1. The study in this work gave effectual evidence on the possibility of using the oriented UTCL for developing low cost fuel cells.
    No preview · Article · Jan 2015 · Electrochimica Acta
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    ABSTRACT: Water starvation could be one of the reasons for a proton exchange membrane (PEM) water electrolyzer degradation. In this paper, the water starvation phenomena of a unit cell in a PEM electrolyzer stack are investigated. The voltage, current density and temperature distribution are investigated in situ with a segmented electrolyzer. The results show that the voltage of the middle and outlet regions is higher than the inlet voltage, which illustrates water starvation could occur simultaneously in different regions of the electrolyzer. The water stoichiometries have an important effect on the voltage distribution, current density distribution and temperature distribution at 0.5 A cm-2 and 60oC. The electrochemical impedance spectra of different segments display that the cell resistance and charge transfer resistance gradually increase along the water flow direction when the water stoichiometry is 3. At last, according to the flow regime map, the critical water stoichiometry for electrolysis is further discussed.
    No preview · Article · Jan 2015 · RSC Advances
  • Q. Xie · W. Liu · H. Leng · B. Yi · Z. Wang · Y. Chen · C. Duan
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    ABSTRACT: This paper describe a research theoretically of the conversion result to the surface temperature based on long wave infrared detector, proposed a temperature measurement, then validate it by experiments. First, it introduces the constitution and measurement principle of the medical infrared thermal imager. Then, the conversion drift characteristic of infrared detect is described, the experimental data under variable environment is analyzed, and a temperature measurement and a drift compensation formula is proposed. Finally, some experiment with black body was accomplished. The results show the temperature error is under 0.3°C, confirm the validity of the measurement.
    No preview · Article · Jan 2015
  • Y. Chen · W. Liu · Z. Fan · L. Ren · B. Yi · Q. Xie · C. Duan
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    ABSTRACT: In order to solve the problem of the existing single waveband thermal imaging system can™t get precise temperature of object with emissivity unknown, an optical system of beam splitting lens and filter were used to established a colorimetric temperature measurement system based on infrared thermal imaging system. Completed the compensation for non-effective pixel, enhancement of contrast, calibration of nonhomogeneity and coherence for infrared thermal imaging system according to the application requirement, then acquired the calibration data with blackbody as radiation source at 200°∼500° and fit it. A temperature measurement test performed at last, compared with the result acquired by thermocouple and single waveband thermal imaging system, it was shown that the colorimetric pyrometry system achieve the attractive precision after calibration and applied to measure the temperature of the object with emissivity unknown.
    No preview · Article · Jan 2015 · Proceedings of SPIE - The International Society for Optical Engineering
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    ABSTRACT: A 9-cell proton exchange membrane (PEM) water electrolysis stack is developed and tested for 7800 h. The average degradation rate of 35.5 μV h−1 per cell is measured. The 4th MEA of the stack is offline investigated and characterized. The electrochemical impedance spectroscopy (EIS) shows that the charge transfer resistance and ionic resistance of the cell both increase. The linear sweep scan (LSV) shows the hydrogen crossover rate of the membrane has slight increase. The electron probe X-ray microanalyze (EPMA) illustrates further that Ca, Cu and Fe elements distribute in the membrane and catalyst layers of the catalyst-coated membranes (CCMs). The cations occupy the ion exchange sites of the Nafion polymer electrolyte in the catalyst layers and membrane, which results in the increase in the anode and the cathode overpotentials. The metallic impurities originate mainly from the feed water and the components of the electrolysis unit. Fortunately, the degradation was reversible and can be almost recovered to the initial performance by using 0.5 M H2SO4. This indicates the performance degradation of the stack running 7800 h is mainly caused by a recoverable contamination.
    Full-text · Article · Dec 2014 · Journal of Power Sources

Publication Stats

6k Citations
946.02 Total Impact Points

Institutions

  • 2002-2015
    • Chinese Academy of Sciences
      • • Laboratory of Fuel Cells
      • • Dalian Institute of Chemical Physics
      • • State Key Laboratory of Catalysis
      Peping, Beijing, China
  • 2014
    • Third Military Medical University
      Ch’ung-ch’ing-shih, Chongqing Shi, China
  • 1999-2014
    • Dalian Institute of Chemical Physics
      Lü-ta-shih, Liaoning, China
  • 2008
    • Dalian University of Technology
      Lü-ta-shih, Liaoning, China
  • 2007
    • Technical Institute of Physics and Chemistry
      Peping, Beijing, China
  • 2006
    • National Space Science
      Peping, Beijing, China