In-situ optimizing the valence configuration of vanadium sites in NiV-LDH nanosheet arrays for enhanced hydrogen evolution reaction

• 作者: Changcong Wang Dan Yang Danyang He Jianfeng Huang Jianpeng Wu Koji Kajiyoshi Liangliang Feng Liyun Cao Qianqian Liu
• 来源期刊: 能源化学
• 年，卷（期）: 2020,（8）
• 页码范围: 263-271
• 页数: 9页
• 语种: 英文

摘要

Developing the highly active,cost-effective,environmental-friendly,and ultra-stable nonprecious electrocatalysts for hydrogen evolution reaction (HER) is distinctly indispensable for the large-scale practical applications of hydrolytic hydrogen production.Herein,we report the synthesis of well-integrated electrode,NiV layered double hydroxide nanosheet array grown in-situ on porous nickel foam (abbreviated as in-NiV-LDH/NF) via the facile one-step hydrothermal route.Interestingly,the valence configuration of vanadium (V) sites in such NiV-LDH are well dominated by the innovative use of NF as the reducing regulator,achieving the reassembled in-NiV-LDH/NF with a high proportion of trivalent V ions (V3+),and then an enhanced intrinsic electrocatalytic HER activity.The HER testing results show that the in-NiV-LDH/NF drives the current densities of 10 and 100 mA cm-2 at extremely low overpotentials of 114 and 245 mV withoutiR-compensation respectively,even outperforms commercial 20 wt％ Pt/C at the large current density of over 80 mA cm-2 in alkaline media,as well as gives robust catalytic durability of at least 100 h in both alkaline and neutral media.More importantly,this work provides a fresh perspective for designing bimetal (oxy) hydroxides electrocatalysts with efficient hydrogen generation.