Abstract
In this study, a low cost and high efficient porous high-entropy V2Snx(FeCoNi)1.2−xC (x = 0.4 ~ 0.8) MAX electrode (PHEM) has been fabricated through powder metallurgy method. The phase constitutes, morphology, and elements distribution are characterized by X-ray diffraction, scanning electron microscopy, and energy dispersive spectrometer. The hydrogen evolution performance of the materials was investigated by cyclic voltammetry curves, linear polarization curves, and electrochemical impedance spectrum. The electrochemical results reveal that the porous high-entropy MAX electrode exhibits excellent performance on hydrogen evolution. In 6 M KOH solution, the optimized electrode of V2Sn0.6(FeCoNi)0.6C provides overpotentials of 284 mV at 20 mA cm−2, and onset potential and Tafel slope are − 0.26 V (vs RHE) and 37.9 mV dec−1 at room temperature, respectively. Furthermore, porous high-entropy V2Sn0.6(FeCoNi)0.6C MAX electrode exhibits excellent chemical stability in alkaline solution for 13 h. This work is expected to be applied in the fabrication of other porous high-entropy MAX and offers a new route to high performance electrocatalyst for a low cost and simple method.
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This research was financially supported by the Natural Science Foundation of China (51704221) and Outstanding youth fund of Wuhan Polytechnic University (2018J05).
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Yang, J., Fan, Y., Liu, Y. et al. Self-supporting porous high-entropy MAX electrode for highly active electrocatalyst H2 evolution in alkali solution. J Porous Mater 29, 693–704 (2022). https://doi.org/10.1007/s10934-022-01205-5
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DOI: https://doi.org/10.1007/s10934-022-01205-5