Co1-xS embedded in porous carbon derived from metal organic framework as a highly efficient electrocatalyst for oxygen evolution reaction

• Published in: Chinese chemical letters Vol. 30; no. 1; pp. 229 - 233
• Main Authors: He, Denghong, Wu, Xiaolin, Liu, Wei, Lei, Chaojun, Yu, Chunlin, Zheng, Guokui, Pan, Junjie, Lei, Lecheng, Zhang, Xingwang
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.2019
• Subjects: Cobalt sulfides; Electrochemical water splitting; Metal organic framework; Oxygen evolution reaction; Porous composite catalyst; Metal organic framework; Cobalt sulfides; Electrochemical water splitting; Porous composite catalyst; Oxygen evolution reaction
• ISSN: 1001-8417; 1878-5964
• DOI: 10.1016/j.cclet.2018.03.020

[Display omitted] Here, we report a two-step conversion method to fabricate a composite of Co1-xS embedded in porous carbon framework (Co1-xS@C) derived from metal organic frameworks (MOFs). The as-prepared porous dodecahedron Co1-xS@C composite catalyst exhibits excellent electrocatalytic performance towards oxygen evolution reaction (OER). Developing active, robust, and cost-efficient electrocatalysts is critical for oxygen evolution reaction (OER). Here, a novel composite catalyst of Co1-xS embedded in porous dodecahedron carbon hybrid was synthesized by a two-step conversion protocol of a cobalt-based metal-organic framework (ZIF-67). The porous dodecahedron Co1-xS@C composite catalyst was prepared by direct oxidation of ZIF-67 followed by sulfurization reaction. The Co1-xS@C composite exhibit superior OER performance, including a low overpotential of 260mV for 10mA/cm2, a small Tafel slope of ∼85mV/dec, outstanding stability over 80h and almost 100% Faradaic efficiency. The various material characterizations indicate that the excellent activity and strong stability of Co1-xS@C might be attributed to good conductivity of Co1-xS, mesoporous nanostructure, and synergistic effect of Co1-xS encapsulated within porous carbon. This work provides a novel strategy for designing and synthesizing advanced composite electrocatalysts