首页|In situ generation of oxyanions-decorated cobalt(nickel)oxyhydroxide catalyst with high corrosion resistance for stable and efficient seawater oxidation

In situ generation of oxyanions-decorated cobalt(nickel)oxyhydroxide catalyst with high corrosion resistance for stable and efficient seawater oxidation

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The development of efficient and robust anode materials for stable alkaline seawater electrolysis is severely limited by chlorine evolution reaction and chloride corrosion.Here,the sulfur-doped cobalt-nickel bimetallic phosphides(CoNiPS)are specifically designed as a pre-catalyst for navigating a surface reconstruction to fabricate the anions(PO43-and SO42-)-decorated Co(Ni)OOH catalyst(R-CoNiPS)with exceptional durability and high activity for stable alkaline seawater oxidation(ASO).Various experiment techniques together with theoretical simulations both demonstrate that the in situ-generated PO43-and SO42-anions on catalyst surface can improve the oxygen evolution reaction(OER)activity,regulating and stabilizing the catalytic active species Co(Ni)OOH,as well as make a critical role in inhibiting the adsorp-tion of chloride ions and extending the service life of electrode.Therefore,this R-CoNiPS electrode exhi-bits superb OER activity toward ASO and stands out among the non-precious ASO electrocatalysts reported recently,requiring low overpotentials of 420 and 440 mV to attain large current densities of 500 and 1000 mA cm-2 in an alkaline natural seawater electrolyte,respectively.Particularly,the catalyst displays a negligible chloride corrosion at room temperature during ASO operation(＞200 h)at 500 mA cm-2.This work opens up a new viewpoint for designing high-activity and durable electrocata-lysts for seawater electrolysis.

Seawater electrolysisAnionsOxygen evolution reactionChloride corrosion

Fengting Luo、Pei Yu、Jueting Xiang、Junjie Jiang、Shijian Chen

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Chongqing Key Laboratory of Interface Physics in Energy Conversion,College of Physics,Chongqing University,Chongqing 401331,China

Center of Modern Physics,Institute for Smart City of Chongqing University in Liyang,Liyang 213300,Jiangsu,China

National Natural Science Foundation of ChinaFundamental Research Funds of Central UniversitiesFundamental Research Funds of Central Universities

U22A20782022CDJQY-0072022CDJJCLK001

2024

10.1016/j.jechem.2024.03.006

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.94(7)