Li Qingying, Liu Xiaohe, Zheng Zhicheng, Chen Gen, Ma Renzhi, Wan Hao
State Key Laboratory of Powder Metallurgy and School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, P.R. China.
School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, P.R. China.
Dalton Trans. 2022 Jul 26;51(29):11098-11107. doi: 10.1039/d2dt01235a.
Electrocatalytic overall water splitting is a sustainable approach to realizing the clean production of hydrogen energy; however, it is mainly hindered by the sluggish kinetics of the oxygen evolution reaction (OER). For large-scale hydrogen production, it is great urgent to develop efficient and low-cost OER electrocatalyst candidates from commercial noble metal-based materials. Herein, a facile template method was proposed for the preparation of a series of hierarchical NiFeV hydroxide nanotubes. With the combined advantages of a hierarchical nanostructure and the synergistic effect among multi-metal elements, the ternary hydroxides delivered outstanding OER performance. In particular, a low overpotential of 256.5 mV delivering a current density of 10 mA cm with a Tafel slope of 52.4 mV dec was achieved by hierarchical NiFeV hydroxide nanotubes with an initial Ni/Fe/V feed ratio of 8 : 1 : 1. After a subsequent topotactic transformation, ternary phosphide (denoted as NiFeVP) was obtained with the hierarchical nanostructure well maintained, and it achieved further performance enhancement where an overpotential of only 209.5 mV was required to deliver 10 mA cm with a lower Tafel slope of 30.3 mV dec and excellent durability for 50 h for chronopotentiometry even at 50 mA cm, demonstrating an admirable OER electrocatalyst.
电催化全水分解是实现氢能清洁生产的一种可持续方法；然而，它主要受到析氧反应（OER）缓慢动力学的阻碍。对于大规模制氢而言，从商业贵金属基材料中开发高效且低成本的OER电催化剂候选物迫在眉睫。在此，我们提出了一种简便的模板法来制备一系列分级结构的NiFeV氢氧化物纳米管。凭借分级纳米结构的综合优势以及多金属元素之间的协同效应，这些三元氢氧化物展现出出色的OER性能。特别是，初始Ni/Fe/V进料比为8 : 1 : 1的分级NiFeV氢氧化物纳米管实现了256.5 mV的低过电位，对应电流密度为10 mA cm ，塔菲尔斜率为52.4 mV dec 。经过随后的拓扑转变后，获得了保持良好分级纳米结构的三元磷化物（记为NiFeVP），其性能进一步提升，仅需209.5 mV的过电位就能实现10 mA cm ，塔菲尔斜率更低，为30.3 mV dec ，并且在计时电位法中即使在电流密度为50 mA cm 时也具有50 h的出色耐久性，证明是一种令人钦佩的OER电催化剂。
