Synthesis of Cu2−xS electrocatalysts with different stoichiometric numbers by electrodeposition and heat posttreatment

• DOI: 10.1111/jace.19710
• Publication Date: 2024-01-26T15:58:30Z
• Authors: Xujie Xiao; Haoran Yin; Jingkang Chen; Chengfei Zhu
• Keywords: Stoichiometry

Abstract The work presented an electrochemical anode method with different electrolyte concentrations and heat posttreatment to control the stoichiometry structure of Cu 2− x S electrocatalysts. X‐ray diffraction, photoelectron spectroscopy, scanning electron microscopy were employed characterize composition morphology, whereas electrocatalytic activity was evaluated by linear voltammetry impedance spectroscopy. results showed that successfully synthesized thin flake‐shaped 7 4 , which exhibited optimal performance at concentration 0.45 mol L 1 maximum turnover frequency 0.786 s −1 mass 0.539 A g minimum charge transfer resistance 0.156 Ω cm −2 overpotential 154 mV a current density 10 mA . In structure, 2+ coordinated in CuS tetrahedral + 3 triangular structure. Heat could change from 1.75 1.8 improve performance. 9 5 had disappeared. Under same conditions, overvoltage only 128 mV.