塔菲尔方程
化学
过电位
电催化剂
析氧
催化作用
纳米颗粒
电化学
分解水
电解
过渡金属
无机化学
化学工程
电极
有机化学
物理化学
光催化
电解质
工程类
作者
Muhammad Fiaz,Muhammad Athar
出处
期刊:Catalysis Letters
[Springer Nature]
日期:2020-04-30
卷期号:150 (11): 3314-3326
被引量:23
标识
DOI:10.1007/s10562-020-03223-x
摘要
Development of highly efficient and stable bi-functional electrocatalyst towards both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) by engaging the earth abundant precursors has attracted much research attention. In this study, a highly efficient, durable and stable amine functionalized MOF based bi-functional electrocatalyst CuO@NH2-UiO-66 has been facilely synthesized via in-situ incorporation of pre-synthesized CuO nanoparticles into amine functionalized Zr-MOF NH2-UiO-66. It is observed that CuO@NH2-UiO-66 exhibits excellent bi-functional electrocatalytic activity towards HER as well as OER and delivers the benchmark of 10 mA cm−2 current density at just 166 and 283 mV overpotential, respectively, which is better than several previously, reported Cu-based, different transition metals and MOF based HER and OER catalysts. It also exhibits lower Tafel slope value 87 and 113 mV dec−1 towards HER and OER, respectively which indicates faster and better charge transfer during catalytic activity. CuO@NH2-UiO-66 exhibits significant stability and generates constant current density upto 6000 s during water electrolysis experiments. Furthermore, SEM and P-XRD techniques are used to investigate the stability of working electrode after the electrocatalytic studies and it is observed that CuO@NH2-UiO-66 maintains its integrity and chemical structure, after many hours of electrocatalytic activity. This study encourages the development of more earth abundant transition metals and MOFs based electrocatalysts for efficient electrochemical studies.
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