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Xie J.,Southwest University | Xie J.,Chongqing Key Laboratory for Advanced Materials | Guo C.,Southwest University | Guo C.,Chongqing Key Laboratory for Advanced Materials | And 2 more authors.
Physical Chemistry Chemical Physics | Year: 2013

Cu2O-ZnO nanowire solar cells have the advantages of light weight and high stability while possessing a large active material interface for potentially high power conversion efficiencies. In particular, electrochemically fabricated devices have attracted increasing attention due to their low-cost and simple fabrication process. However, most of them are "partially" electrochemically fabricated by vacuum deposition onto a preexisting ZnO layer. There are a few examples made via all-electrochemical deposition, but the power conversion efficiency (PCE) is too low (0.13%) for practical applications. Herein we use an all-electrochemical approach to directly deposit ZnO NWs onto FTO followed by electrochemical doping with Ga to produce a heterojunction solar cell. The Ga doping greatly improves light utilization while significantly suppressing charge recombination. A 2.5% molar ratio of Ga to ZnO delivers the best performance with a short circuit current density (Jsc) of 3.24 mA cm-2 and a PCE of 0.25%, which is significantly higher than in the absence of Ga doping. Moreover, the use of electrochemically deposited ZnO powder-buffered Cu2O from a mixed Cu2+-ZnO powder solution and oxygen plasma treatment could reduce the density of defect sites in the heterojunction interface to further increase Jsc and PCE to 4.86 mA cm-2 and 0.34%, respectively, resulting in the highest power conversion efficiency among all-electrochemically fabricated Cu2O-ZnO NW solar cells. This approach offers great potential for a low-cost solution-based process to mass-manufacture high-performance Cu2O-ZnO NW solar cells. © 2013 the Owner Societies. Source


Liu Q.,Southwest University | Liu Q.,Chongqing Key Laboratory for Advanced Materials | Gu S.,Southwest University | Gu S.,Chongqing Key Laboratory for Advanced Materials | And 2 more authors.
Journal of Power Sources | Year: 2015

Nickel-phosphorus nanoparticles film on copper foam (Ni-P/CF) was prepared by electrodeposition. This electrocatalyst shows high catalytic activity and durability toward both hydrogen and oxygen evolution reactions in basic electrolytes. The results show that Ni-P/CF can deliver a current density of 10 mA cm-2 at an overpotential of 98 mV for hydrogen production and 325 mV for oxygen generating. A two-electrode water electrolyzer using Ni-P/CF as cathode and anode produces 10 mA cm-2 at a cell voltage of 1.68 V with high stability. © 2015 Published by Elsevier B.V. Source


Zhang L.Y.,Southwest University | Zhang L.Y.,Chongqing Key Laboratory for Advanced Materials | Zhao Z.L.,Southwest University | Zhao Z.L.,Chongqing Key Laboratory for Advanced Materials | And 2 more authors.
Nano Energy | Year: 2015

For the first time, herein formic acid is used to reduce precursor for uniformly distributed ultrasmall Pd nanocrystals on graphene as an electrocatalyst towards formic acid oxidation, demonstrating more negative half-wave potential, much higher catalytic current density, lower charge-transfer resistance and better stability than that of the commercial Pd/C catalyst. Except the contribution of the ultrasmall Pd nanocrystals and graphene to the better catalytic performance than the commercial one, we argue that it could be also attributed to the Pd nanoparticles formed by reduction of formic acid to naturally possess strong affinity for strong absorption towards its oxidation for fast electrooxidation process. © 2014 Elsevier Ltd. Source


Xu M.,Southwest University | Xu M.,Chongqing Key Laboratory for Advanced Materials | Han J.,Southwest University | Han J.,Chongqing Key Laboratory for Advanced Materials | And 12 more authors.
Chemical Communications | Year: 2015

A novel book-like K0.23V2O5 crystal is obtained by a simple hydrothermal method and is explored as a cathode material for Li-ion batteries for the first time. It exhibits a high reversible capacity (of ca. 244 mA h g-1 at a current density of 50 mA g-1), along with a good rate capability (80 mA h g-1 at a current density of 1800 mA g-1) and a good capacity retention (185.3 mA h g-1 after 100 cycles). © 2015 The Royal Society of Chemistry. Source

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