Critical role of phosphorus in hollow structures cobalt-based phosphides as bifunctional catalysts for water splitting
Zhang, Wei (KU Leuven. Department of Materials Engineering)
Han, Ning (KU Leuven. Department of Materials Engineering)
Luo, Jiangshui (Sichuan University. College of Materials Science and Engineering)
Han, Xu (Institut Català de Nanociència i Nanotecnologia)
Feng, Shihui (Stockholm University. Department of Materials and Environmental Chemistry)
Guo, Wei (KU Leuven. Department of Materials Engineering)
Xie, Sijie (KU Leuven. Department of Materials Engineering)
Zhou, Zhenyu (KU Leuven. Department of Materials Engineering)
Subramanian, Palaniappan (KU Leuven. Department of Materials Engineering)
Wan, Kai (KU Leuven. Department of Materials Engineering)
Arbiol i Cobos, Jordi (Institut Català de Nanociència i Nanotecnologia)
Zhang, Chi (Wuyi University. School of Applied Physics and Materials)
Liu, Shaomin (Beijing University of Chemical Technology. College of Chemical Engineering)
Xu, Maowen (Southwest University. Key Laboratory of Luminescent and Real-Time Analytical Chemistry)
Zhang, Xuan (KU Leuven. Department of Materials Engineering)
Fransaer, Jan (KU Leuven.Department of Materials Engineering)

Títol variant:	High-performance bifunctional hollow structures cobalt-based phosphides catalysts for water splitting
Data:	2022
Resum:	Cobalt phosphides electrocatalysts have great potential for water splitting, but the unclear active sides hinder the further development of cobalt phosphides. Wherein, three different cobalt phosphides with the same hollow structure morphology (CoP-HS, CoP-HS, CoP-HS) based on the same sacrificial template of ZIF-67 are prepared. Surprisingly, these cobalt phosphides exhibit similar OER performances but quite different HER performances. The identical OER performance of these CoP-HS in alkaline solution is attributed to the similar surface reconstruction to CoOOH. CoP-HS exhibits the best catalytic activity for HER among these CoP-HS in both acidic and alkaline media, originating from the adjusted electronic density of phosphorus to affect absorption-desorption process on H. Moreover, the calculated ΔG based on P-sites of CoP-HS follows a quite similar trend with the normalized overpotential and Tafel slope, indicating the important role of P-sites for the HER process. Moreover, CoP-HS displays good performance (cell voltage of 1. 67 V at a current density of 50 mA cm) and high stability in 1 M KOH. For the first time, this work detailly presents the critical role of phosphorus in cobalt-based phosphides for water splitting, which provides the guidance for future investigations on transition metal phosphides from material design to mechanism understanding.
Ajuts:	European Commission 654360 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-327 Ministerio de Ciencia e Innovación TED2021-131458A-I00 Ministerio de Economía y Competitividad SEV-2017-0706
Nota:	La versió preprint no conté els autors Shihui Feng i Shaomen Liu.
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió sotmesa a revisió
Matèria:	Alkaline solutions ; Bifunctional catalysts ; Cobalt-based ; Further development ; Hollow structure ; Performance ; Phosphide ; Sacrificial templates ; Surfaces reconstruction ; Water splitting
Publicat a:	Small, Vol. 18, issue 4 (Jan. 2022) , art. 2103561, ISSN 1613-6829

DOI: 10.1002/smll.202103561

Preprint 29 p, 3.0 MB

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