Synthesis of Cu 2− x S electrocatalysts with different stoichiometric numbers by electrodeposition and heat posttreatment
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2024
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| _version_ | 1867018204137652224 |
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| author | Xujie Xiao Haoran Yin Jingkang Chen Chengfei Zhu |
| author_facet | Xujie Xiao Haoran Yin Jingkang Chen Chengfei Zhu Xujie Xiao Haoran Yin Jingkang Chen Chengfei Zhu |
| collection | Wiley Open Access |
| contents | Synthesis of Cu 2− x S electrocatalysts with different stoichiometric numbers by electrodeposition and heat posttreatment Xujie Xiao Haoran Yin Jingkang Chen Chengfei Zhu Journal of the American Ceramic Society Abstract The work presented an electrochemical anode method with different electrolyte concentrations and heat posttreatment to control the stoichiometry and structure of Cu 2− x S electrocatalysts. X‐ray diffraction, X‐ray photoelectron spectroscopy, and scanning electron microscopy were employed to characterize the composition and morphology, whereas the electrocatalytic activity was evaluated by linear scanning voltammetry and electrochemical impedance spectroscopy. The results showed that the electrochemical method successfully synthesized thin flake‐shaped Cu 7 S 4 , which exhibited optimal performance at the electrolyte concentration of 0.45 mol L 1 with maximum turnover frequency of 0.786 s −1 , maximum mass activity of 0.539 A g −1 , minimum charge transfer resistance of 0.156 Ω cm −2 , and minimum overpotential of 154 mV at a current density of 10 mA cm −2 . In the Cu 7 S 4 structure, Cu 2+ and S 2− were coordinated in a CuS 4 tetrahedral structure, whereas Cu + and S 2− were coordinated in a CuS 3 triangular structure. Heat posttreatment could change the stoichiometry from 1.75 to 1.8 and improve the electrochemical performance. In the Cu 9 S 5 structure, the CuS 3 triangular structure had disappeared. Under the same conditions, the overvoltage was only 128 mV. 10.1111/jace.19710 http://onlinelibrary.wiley.com/termsAndConditions#vor |
| doi_str_mv | 10.1111/jace.19710 |
| format | Artículo Open Access |
| id | wiley_oa_10_1111_jace_19710 |
| institution | Wiley Open Access |
| license_str_mv | http://onlinelibrary.wiley.com/termsAndConditions#vor |
| publishDate | 2024 |
| publisher | Wiley |
| record_format | wiley_oa |
| spellingShingle | Synthesis of Cu 2− x S electrocatalysts with different stoichiometric numbers by electrodeposition and heat posttreatment Xujie Xiao Haoran Yin Jingkang Chen Chengfei Zhu Journal of the American Ceramic Society Synthesis of Cu 2− x S electrocatalysts with different stoichiometric numbers by electrodeposition and heat posttreatment Xujie Xiao Haoran Yin Jingkang Chen Chengfei Zhu Journal of the American Ceramic Society Abstract The work presented an electrochemical anode method with different electrolyte concentrations and heat posttreatment to control the stoichiometry and structure of Cu 2− x S electrocatalysts. X‐ray diffraction, X‐ray photoelectron spectroscopy, and scanning electron microscopy were employed to characterize the composition and morphology, whereas the electrocatalytic activity was evaluated by linear scanning voltammetry and electrochemical impedance spectroscopy. The results showed that the electrochemical method successfully synthesized thin flake‐shaped Cu 7 S 4 , which exhibited optimal performance at the electrolyte concentration of 0.45 mol L 1 with maximum turnover frequency of 0.786 s −1 , maximum mass activity of 0.539 A g −1 , minimum charge transfer resistance of 0.156 Ω cm −2 , and minimum overpotential of 154 mV at a current density of 10 mA cm −2 . In the Cu 7 S 4 structure, Cu 2+ and S 2− were coordinated in a CuS 4 tetrahedral structure, whereas Cu + and S 2− were coordinated in a CuS 3 triangular structure. Heat posttreatment could change the stoichiometry from 1.75 to 1.8 and improve the electrochemical performance. In the Cu 9 S 5 structure, the CuS 3 triangular structure had disappeared. Under the same conditions, the overvoltage was only 128 mV. 10.1111/jace.19710 http://onlinelibrary.wiley.com/termsAndConditions#vor |
| title | Synthesis of Cu 2− x S electrocatalysts with different stoichiometric numbers by electrodeposition and heat posttreatment |
| topic | Journal of the American Ceramic Society |
| url | https://ceramics.onlinelibrary.wiley.com/doi/10.1111/jace.19710 |