过电位
塔菲尔方程
材料科学
石墨烯
电催化剂
分解水
石墨氮化碳
析氧
钴
三元运算
化学工程
氮化物
电化学
无机化学
纳米技术
化学
催化作用
电极
物理化学
冶金
光催化
有机化学
工程类
程序设计语言
计算机科学
图层(电子)
作者
B. Shalini Reghunath,Sruthi Rajasekaran,K.R. Sunaja Devi,Dephan Pinheiro,Jadan Resnik Jaleel UC
标识
DOI:10.1016/j.ijhydene.2022.10.169
摘要
Multicomponent electrocatalysts containing carbon supports play a crucial role in influencing the hydrogen and oxygen evolution reactions which enhance the total water splitting. Herein, we report a ternary composite with cobalt ferrite, graphitic carbon nitride, and N-doped graphene quantum dots prepared via hydrothermal technique. The purity of the samples is established by carrying out various characterization methods. The intrinsic characteristics of the obtained materials are investigated by employing electrocatalytic processes in an alkaline media toward hydrogen and oxygen evolution reactions. Cobalt ferrite/graphitic carbon nitride/N doped graphene quantum dots electrocatalyst demonstrates a very low overpotential towards hydrogen evolution reaction of 287 mV at a constant 10 mA cm−2 current density in 1.0 M KOH. Tafel slope and Rct values generated are 94 mV dec−1 and 0.86 cm2, respectively. Oxygen evolution reaction studies reveal an overpotential of 445 mV at 10 mA cm−2 with a Tafel slope of 69 mV dec−1. Finally, the cell potential needed for the cobalt ferrite/graphitic carbon nitride/N doped graphene quantum dots electrode to achieve 10 mA cm−2 in total water splitting is only 2.0 V while displaying long-term stability.
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