Hierarchical Porous Ni3S4 with Enriched High-Valence Ni Sites as a Robust Electrocatalyst for Efficient Oxygen Evolution Reaction
Wan, Kai (Katholieke Universiteit Leuven. Department of Materials Engineering)
Luo, Jiangshui (Katholieke Universiteit Leuven. Department of Materials Engineering)
Zhou, Chen (Katholieke Universiteit Leuven. Department of Materials Engineering)
Zhang, Ting (Institut Català de Nanociència i Nanotecnologia)
Arbiol i Cobos, Jordi (Institut Català de Nanociència i Nanotecnologia)
Lu, Xihong (Sun Yat-Sen University)
Mao, Bing-Wei (Xiamen University)
Zhang, Xuan (Katholieke Universiteit Leuven. Department of Materials Engineering)
Fransaer, Jan (Katholieke Universiteit Leuven. Department of Materials Engineering)

Data:	2019
Resum:	Electrochemical water splitting is a common way to produce hydrogen gas, but the sluggish kinetics of the oxygen evolution reaction (OER) significantly limits the overall energy conversion efficiency of water splitting. In this work, a highly active and stable, meso-macro hierarchical porous Ni S architecture, enriched in Ni is designed as an advanced electrocatalyst for OER. The obtained Ni S architectures exhibit a relatively low overpotential of 257 mV at 10 mA cm and 300 mV at 50 mA cm . Additionally, this Ni S catalyst has excellent long-term stability (no degradation after 300 h at 50 mA cm ). The outstanding OER performance is due to the high concentration of Ni and the meso-macro hierarchical porous structure. The presence of Ni enhances the chemisorption of OH , which facilitates electron transfer to the surface during OER. The hierarchical porosity increases the number of exposed active sites, and facilitates mass transport. A water-splitting electrolyzer using the prepared Ni S as the anode catalyst and Pt/C as the cathode catalyst achieves a low cell voltage of 1. 51 V at 10 mA cm . Therefore, this work provides a new strategy for the rational design of highly active OER electrocatalysts with high valence Ni and hierarchical porous architectures.
Ajuts:	Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-327 Ministerio de Economía y Competitividad ENE2017-85087-C3 Ministerio de Economía y Competitividad SEV-2013-0295
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió sotmesa a revisió
Matèria:	Durability ; Hierarchical porous structure ; High-valence Ni3+ ; Ni3S4 ; Oxygen evolution reaction
Publicat a:	Advanced functional materials, Vol. 29, Issue 18 (May 2019) , art. 1900315, ISSN 1616-3028

DOI: 10.1002/adfm.201900315

Preprint 42 p, 2.9 MB

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