过电位
析氧
双金属片
电解质
电催化剂
塔菲尔方程
催化作用
化学工程
电化学
分解水
材料科学
氢氧化物
无机化学
化学
碱性水电解
金属
电极
电解
冶金
物理化学
工程类
光催化
生物化学
作者
Mia Rinawati,Yu‐Xuan Wang,Kuei-Yuan Chen,Min‐Hsin Yeh
标识
DOI:10.1016/j.cej.2021.130204
摘要
The increase of high energy resource demand has led to the rapid development of clean fuel of hydrogen by efficiently electrolytic water splitting. However, considering the sluggish kinetics of the oxygen evolution reaction (OER) as the the bottleneck in its electrochemical activity, it is desirable to develop water oxidation electrocatalysts operating under alkaline conditions. Herein, in this study, an effective precursor conversion by a bimetallic metal-organic framework (MOF) is proposed for the first time for fabricating the NiFe layered double hydroxide (LDH) via spontaneously deriving process in the alkaline electrolyte without any additional treatments. The bimetallic MOF-74-derived NiFe LDH provided desirable hot spots for electrocatalizing OER in alkaline solution and facilitated electrolyte penetration within the uniform channel in an organized nanostructure to further increase the contact area between the active material and electrolyte. Compared to pristine NiFe LDH and commercial RuO2, MOF-74-derived NiFe LDH shows higher electroactivity with a promising overpotential of 299 mV to reach a current density of 10 mA cm−2 and a lower Tafel slope of 48.7 mV dec−1 in 1.0 M KOH. This study proposes a facile and easy strategy to design a bimetallic MOF-derived LDH with various metallic combinations and ratios for application in different applications.
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