Theoretical and experimental design of Pt-Co(OH)2 electrocatalyst for efficient HER performance in a

• 作 者: Haijun Wu Xiaoqing Zuo Shanpen
• 机 构: School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming,
• 出 处: 自然科学进展（英文版）
• 发表日期: 2019年3期

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, de-monstrating 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 of 58 mV dec?1 and the good stability for 20000s without obvious degradation.