Hydrothermal Synthesis and Electrocatalytic Performance of CoS2-MoS2 Composite Catalyst for Overall Water Splitting
FU Linping
LU Yaozong
LI Ming
ZHANG Longhua
HE Yu
LIU Wei
Abstract：The catalysts used for hydrogen production from water splitting are often expensive and various types of catalysts are mono-functional,which hinders the engineering application of electrolytic water.To address these challenges,based on the structural and catalytic reaction characteristics of molybdenum disulfide material and cobalt sulfide,a series of non-precious bifunctional CoS2-MoS2 catalysts with controlled cobalt-molybdenum molar ratios were synthesized through a facile one-step hydrothermal method.The samples were analyzed through field emission scanning electron microscopy,transmission electron microscopy,X-ray diffraction,X-ray photoelectron spectroscopy and electrochemical analysis.The experimental results showed the CoS2-MoS2 catalyst(CoS2-MoS2-1-3)displayed a micro-flower like morphology and exhibited the optimal catalytic activity,with the overpotential of OER reduced by approximately 128 mV compared with that of pristine CoS2,and that of HER reduced by about 131 mV compared with that of pristine MoS2,in 0.1 M KOH.The current density retention for OER and HER after 50 h testing were 99.38％and 84.12％,respectively,indicating good electrocatalytic stability.When the composite electrode was employed as both anode and cathode for overall water splitting in 1 M KOH electrolyte,the current density of 10 mA·cm-2 could be achieved with only 1.77 V,and the current density retention was 89.08％after 50 h of stability tests.
Keywords：MoS2CoS2oxygen evolution reactionhydrogen evolution reactioncomposite catalystbifunctional catalysisoverall water splitting
Publication Date：2025-06-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：11( 35-44,54 )