Theoretical and experimental design of Pt-Co(OH)_2 electrocatalyst for efficient HER performance in alkaline solution |
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| Authors: | Haijun Wu Xiaoqing Zuo Shan-Peng Wang Jun-Wen Yin Yan-Ning Zhang Jialin Chen |
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| Institution: | 1. School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan, 650093, China;2. State Key Laboratory of New Technologies for Comprehensive Utilization of Rare and Precious Metals, Kunming, Yunnan, 650106, China;3. Beijing Computational Science Research Center, Beijing, 100084, China;4. Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 611731, China;1. Fudan University;2. Institute of Metal Research, Chinese Academy of Science;3. School of Physics, Beihang Univesity |
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| Abstract: | Design efficient electrocatalysts become significant for the hydrogen evolution reaction (HER) in alkaline solution.Here,the HER performance on Pt-Co(OH)2 has been investigated by using DFT calculations.Compared with pure Pt,the Pt-Co(OH)2 shows excellent hydrogen binding energy (-0.29 eV) and hydrogen adsorption free energy (0.02 eV).More strikingly,the water dissociation process on Pt-Co(OH)2 is an exothermic reaction while that of Pt is an endothermic reaction,demonstrating that the Pt-Co(OH)_2 is an excellent catalyst for HER in alkaline medium.Then the two-step electrodepositions was used to fabricate Pt-Co(OH)2 on the carbon paper (CP).The Pt-Co(OH)_2/CP shows the lowest overpotential of only 37.6 mV at a current density of 10 mA cm~(-2) in 0.1M KOH,the smallest Tafel slope of58 mV dec~(-1) and the good stability for 20000s without obvious degradation. |
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| Keywords: | Corresponding author |
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