期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 8, 期 44, 页码 23637-23644出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta09410b
关键词
-
资金
- Professorial and Doctoral Scientific Research Foundation of Huizhou University [2020JB027]
Developing low-cost and high-efficiency bifunctional electrocatalysts for both the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is pivotal for large-scale production of clean and sustainable hydrogen energy, but still remains challenging. In this work, a facile strategy to construct the VOOH/Ti3C2Tx MXene heterostructures is reported, benefiting from the optimized electronic structure and abundant heterogeneous interfaces that weakens the adsorption of oxygen-containing intermediates, as well as accelerating the dissociation of water molecules, thus facilitating the catalytic kinetics of the OER and HER. As expected, the VOOH/Ti3C2Tx MXene required overpotentials of 238 mV for the OER and 100 mV for the HER to reach a current density of 10 mA cm(-2). More importantly, by employing the VOOH/Ti3C2Tx MXene as both the anode and the cathode, a two-electrode alkaline electrolyzer delivers a current density of 10 mA cm(-2) at a low cell voltage of 1.579 V, which is superior to the commercial IrO2||Pt/C couple. This work opens up appealing opportunities for the rational design of MXene-based hybrid materials for efficient H-2 production and other energy-related applications.
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