Enhancement of hydrogen evolution reaction by Pt nanopillar-array electrode in alkaline media and the effect of nanopillar length on the electrode efficiency |
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| Affiliation: | 1. Department of Electro-Optical Engineering, Southern Taiwan University of Science and Technology, Tainan, 710, Taiwan;2. Institute of Photonic System, National Chiao Tung University, Tainan, 71150, Taiwan;1. College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China;2. Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA;1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China;2. Jiangxi Key Laboratory for Advanced Copper and Tungsten Materials, Jiangxi Academy of Sciences, Nanchang 330029, China;1. Institute of chemical problems, National Academy of sciences of Azerbaijan, AZ 1143 Baku, Azerbaijan;2. Chemistry Department, Faculty of Science, Sohag University, 82524 Sohag, Egypt;1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, People’s Republic of China;2. Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin 300072, People’s Republic of China;3. Tianjin Mainland Hydrogen Equipment Co., Ltd., Tianjin 301609, People’s Republic of China;1. College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu, 610059, Sichuan, China;2. Institute for Advanced Study, Chengdu University, Chengdu, 610106, China |
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| Abstract: | Pt nanopillar-array 3D electrodes with nanopillar length of 150, 450 and 900 nm and nanopillar density of ~109 cm?2 were fabricated. Their catalytic activity for hydrogen evolution reaction (HER) was evaluated by linear sweep voltammetry and electrochemical impedance spectroscopy. In comparison with straightly electrodeposited black Pt film and forged Pt sheet electrodes, the HER current density has been significantly improved by the nanopillar-array architecture. The overpotential of HER at current density of 10 mA cm-2 at 26 °C is as low as 78 mV, lower than the black Pt film of 107 mV and the Pt sheet of 174 mV. The improvement of HER is ascribed to the low charge transfer resistance of the 3D electrode and the high desorption capability of hydrogen bubbles at the nanotips. Interestingly, the nanopillar-array 3D electrode has an optimal nanopillar length for HER. The mechanisms for the optimal nanopillar length were investigated here. |
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| Keywords: | Electrolysis Nanoarchitecture 3D electrode Platinum Hydrogen evolution |
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