Pressure-promoted irregular CoMoP2 nanoparticles activated by surface reconstruction for oxygen evolution reaction electrocatalysts. Issue 4 (7th January 2020)

• Record Type: Journal Article
• Authors: Xu, Shishuai; Gao, Xiang; Deshmukh, Amol; Zhou, Junshuang; Chen, Ning; Peng, Wenfeng; Gong, Yutong; Yao, Zhiqiang; Finkelstein, Kenneth D.; Wan, Biao; Gao, Faming; Wang, Mingzhi; Chen, Mingyang; Gou, Huiyang
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 4(2020)
• Page Start: 2001
• Page End: 2007
• Publication Date: 2020-01-07
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c9ta11775j
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Pressure-induced homogeneous CoMoP2 irregular nanoparticles, whose surface Co atoms form Co(OH)2 shells by reconstruction, and Mo atoms maintain the structural integrity. Abstract : Developing highly ordered and conductive phosphorous-based materials and identifying their active sites are critical to improve the catalytic performance for oxygen evolution reactions (OERs). Herein, we report a template-free and rapid high-pressure synthesis protocol to fabricate irregular CoMoP2 nanoparticles for OER catalysts. Pure CoMoP2 electrocatalysts show a reduced overpotential of 270 mV at 10 mA cm −2, improved kinetics and long-term stability. XAS, XPS and DFT calculations reveal that the reorganization induces highly active Co sites with a Co(OH)2 layer on the surface, while Mo atoms regulate electronic conductivity towards OER reduction potential and maintain the structural integrity of CoMoP2 . This work not only provides an identified activation mechanism for bimetallic catalysts, but also highlights the high-pressure synthesis as one of the alternative approaches for developing OER catalysts.