Highly active atomic Cu catalyst anchored on superlattice CoFe layered double hydroxide for efficient oxygen evolution electrocatalysis

电催化剂 塔菲尔方程 析氧 过电位 层状双氢氧化物 催化作用 高分辨率透射电子显微镜 分解水 材料科学 氢氧化物 化学工程 超晶格 无机化学 纳米技术 透射电子显微镜 化学 电化学 电极 物理化学 冶金 光电子学 工程类 光催化 生物化学
作者
Mohamed H. Elbakkay,S.I. El‐Dek,Ahmed A. Farghali,Waleed M. A. El Rouby
出处
期刊:International Journal of Hydrogen Energy [Elsevier BV]
卷期号:47 (17): 9876-9894 被引量:11
标识
DOI:10.1016/j.ijhydene.2022.01.069
摘要

Developing active, natural abundant and non-expensive electrocatalysts for large scale production and storage of clean hydrogen (H2) fuel is a prerequisite to drive stable water splitting reaction. Herein, atomic Cu species loaded on hierarchical flower-like CoFe layered double hydroxides (LDHs) superlattice (denoted as Cux/CoFe LDHs) were firstly fabricated by a facile co-precipitation method followed by a room temperature treatment to load the atomic Cu species from alkaline copper salt solution. The superlattice structure was proved by the high resolution transmission electron microscopy (HRTEM). Remarkably, benefiting from high level long ordering associated with vacant cation sites and defects, the unique superlattice structural features and the atomic Cu % loading onto the LDHs matrix, the obtained Cux/CoFe LDHs electrocatalyst exhibited superior activity and stability for oxygen evolution reaction (OER). The loaded atomic Cu species improves the electronic structure and provides more exposed active sites due to synergetic electron coupling between Copper and the LDHs. These atomic species have outstanding potentials for achieving high selectivity and reactivity in electrocatalysis and heterocatalysis. Importantly, the efficient resulted Cu4.76/CoFe LDHs electrode in which the atomic Cu % loading ratio is 4.76% showed the best electrocatalytic activity which only required the much lower overpotential of 253 mV to reach 10 mA/cm2 and a small Tafel slope of 63 mV/decade in 1 M KOH. This electrocatalyst possessed unique superior features to many other state-of-the-art earth-abundant electrocatalysts. This work paves a facile and novel method for enhancing the catalytic activity of CoFe LDHs based electrocatalyst, which may be extended to the synthesis of future electrocatalysts having highly active OER performance.
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