Self-supported Fe_(x)Ni_(1-x)MoO_(4) with synergistic morphology and composition for efficient overall water splitting at large current density  

作　　者：Xin-Yu Zhang Wen-Li Yu Jie Zhao Jia-Yu Fu Bin Dong Fu-Li Wang Jian-Feng Yu Chen-Guang Liu Yong-Ming Chai 

机构地区：[1]State Key Laboratory of Heavy Oil Processing,College of Chemistry and Chemical Engineering,China University of Petroleum(East China),Qingdao 266580,China

出　　处：《Chinese Chemical Letters》2023年第2期327-332,共6页中国化学快报（英文版）

基　　金：financially supported by National Natural Science Foundation of China (No. 52174283);Shandong Provincial Natural Science Foundation (No. ZR2020MB044);Innovation Fund Project for Graduate Students of China University of Petroleum (East China) (No. 22CX04026A);the Fundameantal Research Funds for the Central Universities。

摘　　要：Developing the high activity,low cost and robust large-current-density-based electrocatalysts is of great significance for the industrial electrolytic water splitting.However,the current range of most reported materials is small,which makes it difficult for them to play their roles in practical applications.Here,a self-supported amorphous FexNi1-xMo O4/IF treated with ammonium fluoride (AF_(0.1)-FNMO/IF) is synthesized by one-step hydrothermal method.With the help of NH4F,AF_(0.1)-FNMO/IF exhibits a vertically cross-linked nanosheet with spherical structure.Electrochemical measurement shows that AF_(0.1)-FNMO/IF affords a large current density ordeal and only need low overpotentials of 289 and 345 m V to reach a current response of 500 m A/cm ^(2)for oxygen evolution reaction and hydrogen evolution reaction,respectively,together with long-time stability (both at 500,1000 and 2000 m A/cm ^(2)) in 1.0 mol/L KOH solution.Using it as bifunctional catalyst for overall water splitting,the current densities of 100,500,1000 and1500 m A/cm ^(2)are achieved at a cell voltage of 1.71,1.88,1.94 and 1.97 V with excellent durability,which is much better than that of most published electrodes.The work provides valuable insight for designing higher activity nickel iron-based molybdate catalysts with large current density.

关 键 词：Bimetallic molybdate Bifunctional electrocatalysts Overall water splitting Large current density Alkaline solution 

分 类 号：TQ116.2[化学工程—无机化工] TQ426