Cobalt molybdenum nitride-based nanosheets for seawater splitting
Wang, Xiang (Universitat de Barcelona. Departament d'Enginyeria Electrònica i Biomèdica)
Han, Xu (Institut Català de Nanociència i Nanotecnologia)
Du, Ruifeng (Institut de Recerca en Energia de Catalunya)
Xing, Congcong (Institut de Recerca en Energia de Catalunya)
Qi, Xueqiang (Chongqing University. College of Chemistry and Chemical Engineering)
Liang, Zhifu (Institut Català de Nanociència i Nanotecnologia)
Guardia, Pablo (Institut de Recerca en Energia de Catalunya)
Arbiol i Cobos, Jordi (Institut Català de Nanociència i Nanotecnologia)
Cabot, Andreu (Institució Catalana de Recerca i Estudis Avançats)
Li, Junshan (Chengdu University. Institute of Advanced Study)

Date:	2022
Abstract:	The development of cost-effective bifunctional catalysts for water electrolysis is both a crucial necessity and an exciting scientific challenge. Herein, a simple approach based on a metal-organic framework sacrificial template to preparing cobalt molybdenum nitride supported on nitrogen-doped carbon nanosheets is reported. The porous structure of produced composite enables fast reaction kinetics, enhanced stability, and high corrosion resistance in critical seawater conditions. The cobalt molybdenum nitride-based electrocatalyst is tested toward both oxygen evolution reaction and hydrogen evolution reaction half-reactions using the seawater electrolyte, providing excellent performances that are rationalized using density functional theory. Subsequently, the nitride composite is tested as a bifunctional catalyst for the overall splitting of KOH-treated seawater from the Mediterranean Sea. The assembled system requires overpotentials of just 1. 70 V to achieve a current density of 100 mA cm-2 in 1 M KOH seawater and continuously works for over 62 h. This work demonstrates the potential of transition-metal nitrides for seawater splitting and represents a step forward toward the cost-effective implementation of this technology.
Grants:	Ministerio de Ciencia e Innovación PID2020-116093RB-C43 Ministerio de Ciencia e Innovación PID2019-105490RB-C32 Ministerio de Economía y Competitividad SEV-2017-0706 Ministerio de Economía y Competitividad SEV-2013-0295-17-1 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-327
Note:	Altres ajuts: ICN2 is funded by the CERCA Programme/Generalitat de Catalunya. Part of the present work has been performed in the framework of Universitat Autònoma de Barcelona Materials Science PhD program.
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió sotmesa a revisió
Subject:	Molybdenum nitride ; Cobalt nitride ; Electrocatalysis ; Seawater splitting ; Hydrogen
Published in:	ACS applied materials & interfaces, Vol. 14, issue 37 (Sep. 2022) , p. 41924-41933, ISSN 1944-8252

DOI: 10.1021/acsami.2c09272

Preprint 19 p, 4.6 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles