Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 46, Issue 64, Pages 32536-32545Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2021.07.110
Keywords
MXene; Hydrogen evolution reaction; Cobalt; Electrocatalyst; Ti3C2
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Funding
- Shanghai Science and Technology Innovation Action Plan [17JC1402500]
- Natural Science Foundation of Shanghai [18ZR1410900]
- China Postdoctoral Science Foundation [2017 M621540]
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The study presents a one-step molten salt etching method to prepare Co modified MXene hybrid, which exhibits excellent electrocatalytical activity for hydrogen evolution reaction in alkaline media due to improved electron charge transfer efficiency and increased active sites.
2D transition metal carbides, nitrides and carbonitrides, namely the MXenes, attract more and more attentions due to their unique properties. Here, we reporta simple onestep molten salt etching method to prepare Co modified MXene hybrid (Ti3C2Tx:Co) by the reaction of Ti3AlC2 with Lewis acid CoCl2 at 750 degrees C. Most of Co atoms aggregates in the interlayered space of Ti3C2Tx. Benefitting from the improved electron charge transfer efficiency and increased active sites, the sulfuric acid treated Ti3C2Tx:Co-12h hybrid exhibits excellent electrocatalytical activity for hydrogen evolution reaction in alkaline media, delivering a current density of 10 mA cm-2 at an overpotential of 103.6 mV, which is lower than most noble metal free MXene based electrocatalysts. The results illustrate that the proposed method is very facile and useful to incorporate mid to-late transition metals into the MXene phase to prepare MXene based HER electrocatalysts. (c) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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