Divalent anion intercalation and etching-hydrolysis strategies to construct ultra-stable electrodes for seawater splitting  

作　　者：Jiajia Lu Yang Liu Han-Pu Liang 

机构地区：[1]Key Laboratory of Biofuels,Qingdao Institute of Bioenergy and Bioprocess Technology,Chinese Academy of Sciences,Qingdao,266101,China [2]Henan Provincial Key Laboratory of Nanocomposites and Applications,Institute of Nano-Structured Functional Materials,Huanghe Science and Technology College,Zhengzhou,450006,China [3]School of Materials Science and Engineering,Henan Normal University,Xinxiang,453007,China [4]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing,100049,China [5]Shandong Energy Institute,Qingdao,266101,China

出　　处：《Science China Chemistry》2024年第2期687-695,共9页中国科学（化学英文版）

基　　金：supported from the China Postdoctoral Science Foundation (2020M682250);the Natural Science Foundation of Shandong Province (ZR2022QB062,ZR2021MB070);the DNL Cooperation Fund,CAS (DNL202010)。

摘　　要：Developing stable electrodes for seawater splitting remains a great challenge due to the detachment of catalysts at a large operating current and severe anode corrosion caused by chlorine.Herein,divalent anion intercalation and etching-hydrolysis strategies are deployed to synthesize the ultra-stable anode,dendritic Fe(OH)_(3) grown on Ni(SO_4)_(0.3)(OH)_(1.4)–Ni(OH)_(2).Experimental results reveal that the anode exhibits good activity and excellent stability in alkaline simulated seawater.After 500 h,the current density operated at 1.72 V remains 99.5%,about 210 m A cm^(-2).The outstanding stability originates from the etchinghydrolysis strategy,which strengthens the interaction between the catalyst and the carrier and retards thus the detachment of catalysts at a large current density.Besides,theoretical simulations confirm that the intercalated divalent anions,such as SO_4^(2-) and CO_(3)^(2-),can weaken the adsorption strength of chlorine on the surface of catalysts and hinder the coupling and hybridization between chlorine and nickel,which slows down the anode corrosion and improves catalytic stability.Furthermore,the twoelectrode system shows the remarkable 95.1% energy efficiency at 2,000 A m-2and outstanding stability in 6 mol L^(-1) KOH +seawater at 80 ℃.

关 键 词：seawater splitting stability divalent anion intercalation etching-hydrolysis 

分 类 号：TQ426[化学工程] P746[天文地球—海洋科学]