Improved the Electrocatalytic Hydrogen Evolution Performances of Co-MOF Derivatives Through Introducing Zinc Ions by Two Ways
2022; American Chemical Society; Volume: 36; Issue: 11 Linguagem: Inglês
10.1021/acs.energyfuels.2c00912
ISSN1520-5029
AutoresLing Qin, Jinliang Liu, Xiaoyan Zhou, Yanqing Wang, Xun Sun, Ming‐Dao Zhang,
Tópico(s)MXene and MAX Phase Materials
ResumoDue to the high price and rareness of precious metal electrocatalysts, the preparation of cheap, high-efficiency nonprecious metal electrocatalysts is urgently needed. In this paper, a Co-metal-organic framework (MOF) has been synthesized by the hydrothermal method. In view of the poor electrocatalytic performance of pristine Co-MOF, we used it as a template and obtained the Co-MOF-800 electrocatalyst by high-temperature calcination at 800 °C under a nitrogen atmosphere. To further improve the electrocatalytic hydrogen evolution performance, we used two methods to synthesize cobalt/zinc bimetallic-based electrocatalysts. The first method is adding zinc ions to Co-MOF and stirring to obtain Co-MOF@Zn; the second method is adding zinc ions during the in situ synthesis to obtain Co/Zn-MOF. Finally, Co-MOF@Zn-800 and Co/Zn-MOF-800 were obtained by pyrolysis at 800 °C under a nitrogen atmosphere. The electrocatalytic hydrogen evolution results show that Co-MOF@Zn-800 and Co/Zn-MOF-800 obtained by doping and introducing zinc ions have larger specific surface areas of 369.837 and 347.898 m2 g–1, respectively, and better electrocatalytic hydrogen evolution performances in 0.5 M sulfuric acid. The overpotentials are 218 and 236 mV at a 10 mA cm–2 current density, and the Tafel slopes are 146.6 and 187.0 mV dec–1. After 40 h of stability testing, the Co-MOF@Zn-800 material still holds a nearly constant current density.
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