首页|MXene-Based Quantum Dots Optimize Hydrogen Production via Spontaneous Evolution of Cl-to O-Terminated Surface Groups

MXene-Based Quantum Dots Optimize Hydrogen Production via Spontaneous Evolution of Cl-to O-Terminated Surface Groups

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MXene quantum dots(MQDs)offer wide applications owing to the abundant surface chemistry,tunable energy-level structure,and unique properties.However,the application of MQDs in electrochemical energy conversion,including hydrogen evolution reaction(HER),remains to be realized,as it remains a challenge to precisely control the types of surface groups and tune the structure of energy levels in MQDs,owing to the high surface energy-induced strong agglomeration in post-processing.Consequently,the determination of the exact catalytically active sites and processes involved in such an electrocatalysis is challenging because of the complexity of the synthetic process and reaction conditions.Herein,we demonstrated the spontaneous evolution of the surface groups of the Ti2CTx MQDs(x:the content of O atom),i.e.,replacement of the-Cl functional groups by O-terminated ones during the cathode reaction.This process resulted in a low Gibbs free energy(0.26 eV)in HER.Our steady Ti2COx/Cu2O/Cu foam systems exhibited a low overpotential of 175 mV at 10 mA cm-2 in 1 M aq.KOH,and excellent operational stability over 165 h at a constant current density of-10 mA cm-2.

HF freehydrogen evolutionMXenequantum dotssurface group

Yuhua Liu、Xiaoyu Zhang、Wei Zhang、Xin Ge、Yan Wang、Xu Zou、Xinyan Zhou、Weitao Zheng

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Key Laboratory of Automobile Materials MOE,and School of Materials Science & Engineering,and Jilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy Materials,and Electron Microscopy Center,and International Center of Future Science,Jilin University,Changchun 130012,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaChina Postdoctoral Science Foundation ProjectScience and Technology Research Project of the Department of Education of Jilin Province2020 International Cooperation Project of the Department of Science and Technology of Jilin Province

5187211552101256519320032020 M680043JJKH20211083KJ20200801001GH

2023

10.1002/eem2.12438

能源与环境材料(英文)

能源与环境材料(英文)

CSCD
ISSN：
年,卷(期)：2023.6(6)
  • 101