【摘 要】
：
Developing efficient oxygen evolution reaction(OER)electrocatalysts such as transition metal sulfides(TMSs)is of great importance to advance renewable hydrogen fuel toward further practical applications.Herein,NiCoS2 nanoparticles well decorated on double
【机 构】
：
School of Environment and Safety Engineering,North University of China,Taiyuan 030051,China;State Ke
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Developing efficient oxygen evolution reaction(OER)electrocatalysts such as transition metal sulfides(TMSs)is of great importance to advance renewable hydrogen fuel toward further practical applications.Herein,NiCoS2 nanoparticles well decorated on double-sided N-doped reduced graphene oxide sheets(NiCoS2/rGO)are prepared from an Al-containing ternary NiCoAl-layered double hydroxide precursor(NiCoAl-LDH)grown on GO support as an OER electrocatalyst.The Al-confinement-assisted sulfurization,followed by selective acid treatment,endows the resulting NiCoS2/rGO composite with the advantages:well-dispersed NiCoS2 nanoparticles,dual-sided rGO support,as well as a large specific surface area of 119.4 m2.g-1 and meso-/macroporous size distribution.The NiCoS2/rGO electrocatalyst exhibits an overpotential of 273 mV at 10 mA·cm-2 and a good stability of 24 h,which outperform those of the counterparts of NiS2/rGO and CoS2/rGO.The results of electrochemical active sur-face area and electrochemical impedance spectra experi-mentally provide convincing rationales of the information of active sites and good conductivity,both underpin the enhanced electrocatalytic performances.
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