NDLI: Cobalt sulfide/N,S codoped porous carbon core–shell nanocomposites as superior bifunctional electrocatalysts for oxygen reduction and evolution reactions

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Nanoscale Vol - 7 Issue - 39

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Cobalt sulfide/N,S codoped porous carbon core–shell nanocomposites as superior bifunctional electrocatalysts for oxygen reduction and evolution reactions

Content Provider	Royal Society of Chemistry (RSC)
Author	Li, Rong Xia, Yongde Ma, Guiping Zhu, Yanqiu Chen, Binling Gou, Xinglong
Copyright Year	2015
Abstract	Exploring highly-efficient and low-cost bifunctional electrocatalysts for both oxygen reduction reaction (ORR) and oxygen evolution reactions (OER) in the renewable energy area has gained momentum but still remains a significant challenge. Here we present a simple but efficient method that utilizes ZIF-67 as the precursor and template for the one-step generation of homogeneous dispersed cobalt sulfide/N,S-codoped porous carbon nanocomposites as high-performance electrocatalysts. Due to the favourable molecular-like structural features and uniform dispersed active sites in the precursor, the resulting nanocomposites, possessing a unique core–shell structure, high porosity, homogeneous dispersion of active components together with N and S-doping effects, not only show excellent electrocatalytic activity towards ORR with the high onset potential (around −0.04 V vs. −0.02 V for the benchmark Pt/C catalyst) and four-electron pathway and OER with a small overpotential of 0.47 V for 10 mA cm−2 current density, but also exhibit superior stability (92%) to the commercial Pt/C catalyst (74%) in ORR and promising OER stability (80%) with good methanol tolerance. Our findings suggest that the transition metal sulfide–porous carbon nanocomposites derived from the one-step simultaneous sulfurization and carbonization of zeolitic imidazolate frameworks are excellent alternative bifunctional electrocatalysts towards ORR and OER in the next generation of energy storage and conversion technologies.
Starting Page	20674
Ending Page	20684
Page Count	11
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	7
Issue Number	48
Journal	Nanoscale
DOI	10.1039/c5nr07429k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Zero insertion force Dispersion relation Redox Overpotential Transition metal Carbon Carbonization Renewable energy Oxygen evolution Zeolitic imidazolate framework Porosity Cobalt sulfide Current density Methanol
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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Switching effective oxygen reduction and evolution performance by controlled graphitization of a cobalt–nitrogen–carbon framework system

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