电催化剂
双功能
塔菲尔方程
析氧
计时安培法
化学
电子转移
限制电流
催化作用
循环伏安法
锰
无机化学
过电位
化学工程
电化学
电极
光化学
物理化学
有机化学
工程类
作者
Deviprasath Chinnadurai,Nallal Muthuchamy,Hee‐Je Kim,Oi Lun Li,Kang Hyun Park,Kandasamy Prabakar
出处
期刊:Chemcatchem
[Wiley]
日期:2020-02-04
卷期号:12 (8): 2348-2355
被引量:63
标识
DOI:10.1002/cctc.202000164
摘要
Abstract Manganese‐based electrocatalyst has a great attention for the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) applications, since the discovery of active centre in nature photosynthesis system. The Mn oxidation state optimization and structural defect engineering are essential to get a highly active Mn‐based catalytic materials. MnP showed a good water oxidation activity with a lower overpotential of 286 mV to reach the current density of 10 mA/cm 2 and a Tafel slope of 76 mV/dec. Also, the electron transfer number calculated from both the rotating disk electrode and rotating ring‐disk electrode techniques is a quasi‐4 electron transfer process with an onset and halfwave potential of 0.998 V and 0.936 V vs RHE respectively. MnP achieved a higher limiting kinetic current of 5.7 mA/cm 2 and a very low H 2 O 2 yield of 1.6 %. Chronoamperometry and cyclic voltammetry studies confirmed the long‐term stability and durability of the prepared catalyst. The variance metrics ΔE [Ej 10 −Ej ‐3 ] is used to estimate the overall activity from the potential difference between OER overpotential at 10 mA/cm 2 and ORR kinetic current at 3 mA/cm 2 . MnP shows very low ΔE (0.58 V) which demonstrate an efficient bifunctional activity in ORR and OER reactions. This work might shed new light on the development of MnP based bifunctional oxygen electrocatalyst.
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