Tianquan Lin

Chinese Academy of Sciences, Peping, Beijing, China

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Publications (35)242.04 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: Black TiO2, with increased solar light absorption and enhanced photocatalytic and photoelectrochemical (PEC) performance, has attracted enormous attention, stimulating us to explore the blackening of other oxide semiconductors for enhanced properties. Here, we report the fabrication of black nanostructured Nb2O5 and its enhanced PEC property for the first time. We successfully prepare oxygen-deficient black Nb2O5 nanochannels, which contain considerable amount of oxygen vacancies (Nb4+ sites) serving as shallow donors. The black Nb2O5 exhibits strong visible and infrared light absorption, which can absorb 75.5% solar energy superior to 5.7% for pristine Nb2O5. The PEC performance of black Nb2O5 photoanode is significantly enhanced with a relatively large photocurrent of 1.02 mA cm-2 and high applied bias photon-to-current efficiency (ABPE) of 0.345%, in comparison with the poor performance of pristine Nb2O5 (0.084 mA cm-2 photocurrent and 0.056% ABPE). These results indicate that black Nb2O5 is a promising material for PEC application and solar energy utilization.
    04/2015; 3(22). DOI:10.1039/C5TA01544H
  • Hui Bi, Houlei Cui, Tianquan Lin, Fuqiang Huang
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    ABSTRACT: A novel architecture of graphene wrapped copper-nickel (Cu-Ni) nanospheres (NSs)/graphene film was proposed to be TCO- and Pt-free counter electrode (CE) with high electrocatalytic activity for dye-sensitized solar cells (DSSCs). The novel architecture CE is composed of highly conductive graphene film, Cu-Ni alloy NSs and the wrapping graphene on the surface of alloy NSs. The graphene film as an electrically conductive layer was synthesized by chemical vapor deposition (CVD) on the insulating SiO2 substrate, and graphene wrapped Cu-Ni alloy catalyst NSs on the graphene film were in-situ formed by the reduction of Cu-Ni acetate and graphene growth using CVD. The graphene wrapped Cu-Ni NSs/graphene film CE shows much superior electrocatalytic activity, compared with graphene film, and the power conversion efficiency of 5.46% was achieved in DSSC devices, which is close to that of Pt/FTO electrode (6.19%). Therefore, the novel architecture of graphene wrapped Cu-Ni NSs/graphene film CE may be used as Pt- and TCO-free CEs for low-cost, high performance DSSCs.
    Carbon 04/2015; 91. DOI:10.1016/j.carbon.2015.04.051 · 6.16 Impact Factor
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    ABSTRACT: Colored titania has attracted enormous attentions due to its visible light absorption and wide range of applications. Here, we demonstrate an effective approach to obtain colored titania with enhancing solar absorption by introducing disorder in the surface of titania through Al reduction. As prepared black TiO2−x possesses solar energy absorption up to 88%. The recombination centers of light-induced electrons and holes are reduced in acid solution, which ensures the excellent photocatalytic activity of the black TiO2 −x in the photo-oxidation of organic molecules in water.
    Catalysis Communications 11/2014; 60. DOI:10.1016/j.catcom.2014.11.004 · 3.32 Impact Factor
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    ABSTRACT: Three-dimensional elastic macroscopic graphene network (3D-GN) is prepared with the assistance of porous SiO2 ceramic substrates by using ambient pressure chemical vapor deposition, which is suitable for thermal management application. The free standing elastic macroscopic 3D-GN possesses excellent electrical, mechanical and thermal transfer properties.
    09/2014; 2(43). DOI:10.1039/C4TA03801K
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    ABSTRACT: Graphene/ceramic composites are proposed by directly depositing graphene on the insulating Al2O3 particles by chemical vapor deposition without any metal catalysts. Carbothermic reduction occurring at the Al2O3 surface is vital during the initial stage of graphene nucleation and the graphene sheet can connect with neighboring sheets to completely cover Al2O3 particles. The quality and layer number of graphene on Al2O3 can be finely tailored by changing the growth temperature and gas ratio. Graphene coated Al2O3 (G-Al2O3) composites are used as effective fillers of stearic acid (SA) to increase the thermal transport property. By the optimization of the layer number of graphene, size of Al2O3 particles and ratio of G-Al2O3/SA in a quantitative, their thermal conductivities significantly increase up to 11 folds from 0.15 to 1.65 W m−1 K−1. The great improvement is attributed to the high thermal transfer performance of graphene and excellent wettability between graphene and SA. When the G-Al2O3/SA composites with the graphene coated porous Al2O3 foam, the thermal conductivity further reaches to 2.39 W m−1 K−1, and the corresponding latent heat is 38 J g−1. It demonstrates the potential applications of graphene in thermal transport and thermal energy storage devices.
    Carbon 08/2014; 75:314–321. DOI:10.1016/j.carbon.2014.04.009 · 6.16 Impact Factor
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    ABSTRACT: Black titania nanotube arrays are prepared for the first time by the melted aluminium reduction of pristine anodized and air-annealed titania nanotube arrays. The black titania nanotubes with substantial Ti3+ and oxygen vacancies exhibit an excellent photoelectrochemical water-splitting performance due to the improved charge transport and separation and the extended visible light response. An impressive applied bias photon-to-current efficiency of 1.20% is achieved.
    05/2014; 2(23). DOI:10.1039/C4TA00176A
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    ABSTRACT: Direct growth of graphene on Al2O3 film is successfully achieved assisted with NiAl2O4 film on a SiO2 substrate by chemical vapor deposition at 800 °C. The Ni particles are first uniformly separated out on the substrate, and play an important role in capturing carbon atoms and accelerating the nucleation to grow high quality graphene rooting on insulating Al2O3 film. The thickness of graphene films can be tuned from two layers to few layers (<10) by changing growth time. The continuous graphene films exhibit extremely excellent electrical transport properties with a sheet resistance of down to 18.5 Ω sq−1. The graphene/Ni/Al2O3/SiO2 is used as the counter electrode of dye sensitized solar cell which achieves a photovoltaic efficiency of 7.62%.
    Carbon 05/2014; 71:20–26. DOI:10.1016/j.carbon.2013.12.064 · 6.16 Impact Factor
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    ABSTRACT: Nonmetal-doped black titania is achieved in a core-shell structure by a two-step synthesis. The nonmetal dopants in amorphous TiO2-x shells decrease e-h recombination centers, and more than 6.6 at.% N further improves solar energy absorption from 65% up to 85%. The photocatalytic H-2 generation of the N-doped black titania is 15.0 mmol h(-1) g(-1) under 100 mW cm(-2) of full-sunlight and 200 mmol h(-1) g(-1) under 90 mW cm(-2) of visible-light irradiation, superior to TiO2-x and reported titania photocatalysis.
    Energy & Environmental Science 03/2014; 7(3):967-972. DOI:10.1039/c3ee42708k · 20.52 Impact Factor
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    ABSTRACT: We report a new rapid household microwave method to successfully grow graphene on h-BN flakes without using any catalysts. We obtained a novel uniform multi-level matrix of vertical graphene sheets on h-BN flakes. The unique structure possessed outstanding electron conductivity and thermal properties (29.1 W m-1 K-1).
    ACS Applied Materials & Interfaces 02/2014; 6(5). DOI:10.1021/am405689r · 6.72 Impact Factor
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    ABSTRACT: Directional heat transfer can provide an efficient way for thermal management in thermal transfer, thermal energy storage, etc. A novel growth method is proposed to synthesize continuous graphene films on insulating substrates by Ni-assisted chemical vapor deposition (CVD) at relatively low temperature down to 800 °C. Uniformly dispersed Ni nanoparticles on ceramic substrates play an important role of capturing carbon atoms and accelerating the nucleation to grow high quality graphene rooted on insulating ceramic substrates (anodic aluminum oxide, cordierite). The graphene species consist of 1D isolated graphene tubes coated on AAO, which can act as the media for directional thermal transport. The graphene/Ni/cordierite composite contains an interconnected macroporous graphene framework with a low sheet electrical resistance down to 8.6 Ω sq−1 and thermal conductivity of 4.17 W m−1 K−1. The porous graphene/Ni/cordierite composite can hold phase change materials (wood's alloy) to construct efficient thermal energy storage devices due to its high thermal conductivity, which can be used as heat sinks in thermoelectric devices. This work displays the great potential of CVD direct growth of graphene on insulating porous substrates for directional heat conduction, thermal management and thermoelectric applications.
    01/2014; 2(7). DOI:10.1039/C3TA14325B
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    ABSTRACT: Anatase TiO2 is one of the most important energy materials, but suffers from poor electrical conductivity. Nb-doping has been considered as an effective way to improve its performance in the applications of photocatalysis, solar cells, Li batteries and transparent conducting oxide films. Here, we report the further enhancement of electron transport in Nb-doped TiO2 nanoparticles via pressure-induced phase transitions. The phase transition behavior and influence of Nb-doping in anatase Nb-TiO2 are systematically investigated by in situ synchrotron X-ray diffraction and Raman spectroscopy. The bulk moduli are determined to be 179.5, 163.3, 148.3 and 139.0 GPa for 0, 2.5, 5.0 and 10.0 mol% Nb-doped TiO2, respectively. The Nb-concentration-dependent stiffness variation is demonstrated that the sample with higher Nb concentration has lower stiffness. In situ resistance measurement reveals an increase of 40% in conductivity of quenched Nb-TiO2 compared to the pristine anatase phase. The pressure-induced conductivity evolution is discussed detailedly in terms of the packing factor model, which provides a direct evidence for the rationality of packing factor correlated with electron transport in semiconductors. Such pressure-treated Nb-doped TiO2 with unique properties surpassing those in anatase phase hold great promise for energy-related applications.
    Journal of the American Chemical Society 12/2013; 136(1). DOI:10.1021/ja410810w · 11.44 Impact Factor
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    ABSTRACT: Black TiO2 attracts enormous attention due to its large solar absorption and induced excellent photocatalytic activity. Herein, a new approach assisted by hydrogen plasma to synthesize unique H-doped black titania with a core/shell structure (TiO2@TiO2-xHx) is presented, superior to the high H2-pressure process (under 20 bar for five days). The black titania possesses the largest solar absorption (≈83%), far more than any other reported black titania (the record (high-pressure): ≈30%). H doping is favorable to eliminate the recombination centers of light-induced electrons and holes. High absorption and low recombination ensure the excellent photocatalytic activity for the black titania in the photo-oxidation of organic molecules in water and the production of hydrogen. The H-doped amorphous shell is proposed to play the same role as Ag or Pt loading on TiO2 nanocrystals, which induces the localized surface plasma resonance and black coloration. Photocatalytic water splitting and cleaning using TiO2-xHx is believed to have a bright future for sustainable energy sources and cleaning environment.
    Advanced Functional Materials 11/2013; 23(43):5444-5450. DOI:10.1002/adfm.201300486 · 11.81 Impact Factor
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    ABSTRACT: Modification of rutile titanium dioxide (TiO</sub>2<sub>) for hydrogen generation and water cleaning is a grand challenge due to the chemical inertness of rutiles, while such inertness is a desired merit for its stability in photoelectrochemical applications. Herein, we report an innovative two-step method to prepare a core-shell nanostructured S-doped rutile TiO</sub>2<sub> (R'-TiO</sub>2<sub>-S). This modified black rutile TiO</sub>2<sub> sample exhibits remarkably enhanced absorption in visible and near infrared regions and efficient charge separation and transport. As a result, the unique sulfide surface (TiO</sub>2-x<sub>:S) boosts the photocatalytic water cleaning and water splitting with a steady solar hydrogen production rate of 0.258 mmol h</sup>-1<sup> g</sup>-1<sup>. The black titania is also an excellent photoelectrochemical (PEC) electrode exhibiting a high solar-to-hydrogen conversion efficiency of 1.67 %. The sulfided surface shell is proved to be an effective strategy for enhancing solar light absorption and photoelectric conversion.
    Journal of the American Chemical Society 10/2013; 135(47). DOI:10.1021/ja4076748 · 11.44 Impact Factor
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    ABSTRACT: Utilizing solar energy for hydrogen generation and water cleaning is a great challenge due to insufficient visible-light power conversion. Here we report a mass production approach to synthesize black titania by aluminium reduction. The obtained sample possesses a unique crystalline core-amorphous shell structure (TiO2@TiO2−x). The black titania absorbs 65% of the total solar energy by improving visible and infrared absorption, superior to the recently reported ones (30%) and pristine TiO2 (5%). The unique core-shell structure (TiO2@TiO2−x) and high absorption boost the photocatalytic water cleaning and water splitting. The black titania is also an excellent photoelectrochemical electrode exhibiting a high solar-to-hydrogen efficiency (1.7%). A large photothermic effect may enable black titania “capture” solar energy for solar thermal collectors. The Al-reduced amorphous shell is proved to be an excellent candidate to absorb more solar light and receive more efficient photocatalysis.
    Energy & Environmental Science 10/2013; 6(10):3007. DOI:10.1039/c3ee41817k · 20.52 Impact Factor
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    ABSTRACT: Not always black and white: Gray TiO2 nanowires with high photocatalytic activity have been successfully synthesized by aluminum-mediated reduction in a two-zone furnace. These wires, which possess a core (TiO2-x )/shell (TiO2 ) structure, exhibit visible-light and even IR absorption with high photocatalytic activity, far exceeding that of commercial Degussa P25. They show high stability in air and water under solar-light irradiation.
    Chemistry - A European Journal 09/2013; 19(40). DOI:10.1002/chem.201302286 · 5.70 Impact Factor
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    ABSTRACT: The composite films of metal sulfide (MS, M = Ni, Co) nanoparticles (NPs)/graphene films were proposed to be novel transparent conductive oxide- and platinum (Pt)-free counter electrodes with high electrocatalytic activity for dye-sensitized solar cells (DSSCs). Such DSSCs show higher photovoltaic conversion efficiencies of 5.25% (NiS/graphene) and 5.04% (CoS/graphene), compared with 5.00% for (Pt/fluorine-doped tin oxide). The excellent DSSC efficiencies are mainly due to the superior electrocatalytic activity of the MS and graphene films, and highly electrical properties of graphene films (9.57 Omega/sq). The excellent charge transfer between MS NPs and graphene films is due to the unique MS NPs and high surface area graphene structure. The graphene films were directly grown on dielectric SiO2 substrates by chemical vapor deposition. MS NPs were uniformly implanted on the graphene films by dip,coating of MS precursors M(C3HSOS2)(2), and further annealed at 400 degrees C for 30 min under Ar.
    Carbon 09/2013; 61:116-123. DOI:10.1016/j.carbon.2013.04.075 · 6.16 Impact Factor
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    ABSTRACT: Black platelike brookite with outstanding photocatalytic performance is prepared by constructing a distinct crystalline core/disordered shell structure (TiO2@TiO2−x) through aluminium reduction. Many oxygen vacancies and Ti3+ states are introduced into the distorted shell, which increase the solar energy absorption and boost the photocatalytic activity.
    08/2013; 1(34). DOI:10.1039/C3TA11782K
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    ABSTRACT: A phase change material consisting of three-dimensional graphene aerogel (GA) and octadecanoic acid (OA) was produced. The GA was assembled from the sheets of graphene oxide in a hydrothermal reaction. The pore sizes of the network were several micrometers and the pore walls consisted of thin layers of stacked graphene sheets. OA was impregnated into GA by capillary forces, with the GA acting as the support. The GA/OA composite had a thermal conductivity about 2.635 W/m K at a GA loading fraction of ∼20 vol%, which was about 14 times that of the OA (0.184 W/m K). The transient heating and cooling responses of the material were investigated for thermal energy storage. The GA had a low bulk density so that the weight percent of the GA in the composite was only about 15%. The composite presents a high heat storage capacity of 181.8 J/g, which was very close to the value of the OA alone (186.1 J/g).
    Solar Energy Materials and Solar Cells 06/2013; 113:195–200. DOI:10.1016/j.solmat.2013.01.046 · 5.34 Impact Factor
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    ABSTRACT: The composite substrate of Co and Cu was proposed to grow homogenous high quality wafer-size graphene films by an atmosphere pressure CVD method. The composite substrate consists of a moderate-carbon-solubility metal top (Co coating) as a C-dissolving layer and a low-carbon-solubility metal base (Cu foil) as a C-rejecting layer. During the CVD process, the interdiffusion of Co and Cu atoms occurs in the composite. With the dynamic control on Co and Cu alloying process to affect the carbon solubility, active carbon atoms captured by the Co layer were segregated to form spontaneously a high-quality graphene film on the top of Cu-Co substrate. The tunable layer-number of the graphene films can be precisely controlled by adjusting the thickness of the Co layer. High quality single-layered graphene films with a 98% yield were prepared on an 80 nm-Co-coated Cu foil and insensitive to growth temperature and time. More importantly, this type of composite substrate has also been developed to grow AB-stacked bilayers and three-layer graphene with 99% surface coverage and absence of defects. The approach is opening up a new avenue for high-quality graphene production with precise layer control through composite substrate design.
    Nanoscale 05/2013; 5(13). DOI:10.1039/c3nr33124e · 6.74 Impact Factor
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    ABSTRACT: A simple and scalable method was proposed to fabricate graphene papers, and the graphene sheets were prepared using conventional chemical vapor deposition (CVD) method. The CVD graphene papers possess much higher electrical conductivity of 1097 S cm−1, compared with other reported carbon-related papers (graphene, carbon nanotube, etc.). The graphene papers have good flexibility with only <5% loss of electrical conductivity after mechanically bending 500 times. Such free-standing graphene papers can replace expensive Pt/FTO counter electrodes of dye-sensitized solar cells with better energy conversion efficiency, and also be used as anodes of lithium ion batteries possessing a superior high-rate capacity and cycling performance. The highly conductive, free-standing and flexible graphene papers reveal potential in high-performance, flexible energy conversion and storage devices.
    RSC Advances 05/2013; 3(22):8454-8460. DOI:10.1039/C3RA23500A · 3.84 Impact Factor

Publication Stats

409 Citations
242.04 Total Impact Points

Institutions

  • 2011–2015
    • Chinese Academy of Sciences
      • Graduate School
      Peping, Beijing, China
  • 2011–2013
    • Peking University
      • • College of Chemistry and Molecular Engineering
      • • National Laboratory of Rare Earth Material Chemistry and Application
      Peping, Beijing, China