材料科学
氢氧化物
单层
水溶液
化学工程
析氧
电催化剂
镍
分解水
过电位
无机化学
催化作用
电化学
纳米技术
层状双氢氧化物
塔菲尔方程
化学
有机化学
电极
物理化学
冶金
工程类
光催化
作者
Xin Zhang,Yufei Zhao,Yunxuan Zhao,Run Shi,Geoffrey I. N. Waterhouse,Tierui Zhang
标识
DOI:10.1002/aenm.201900881
摘要
Abstract In this work, porous monolayer nickel‐iron layered double hydroxide (PM‐LDH) nanosheets with a lateral size of ≈30 nm and a thickness of ≈0.8 nm are successfully synthesized by a facile one‐step strategy. Briefly, an aqueous solution containing Ni 2+ and Fe 3+ is added dropwise to an aqueous formamide solution at 80 °C and pH 10, with the PM‐LDH product formed within only 10 min. This fast synthetic strategy introduces an abundance of pores in the monolayer NiFe‐LDH nanosheets, resulting in PM‐LDH containing high concentration of oxygen and cation vacancies, as is confirmed by extended X‐ray absorption fine structure and electron spin resonance measurements. The oxygen and cation vacancies in PM‐LDH act synergistically to increase the electropositivity of the LDH nanosheets, while also enhancing H 2 O adsorption and bonding strength of the OH* intermediate formed during water electrooxidation, endowing PM‐LDH with outstanding performance for the oxygen evolution reaction (OER). PM‐LDH offers a very low overpotential (230 mV) for OER at a current density of 10 mA cm −2 , with a Tafel slope of only 47 mV dec −1 , representing one of the best OER performance yet reported for a NiFe‐LDH system. The results encourage the wider utilization of porous monolayer LDH nanosheets in electrocatalysis, catalysis, and solar cells.
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