Issue 44, 2020

In situ formed VOOH nanosheet arrays anchored on a Ti3C2Tx MXene as a highly efficient and robust synergistic electrocatalyst for boosting water oxidation and reduction

Abstract

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 H2 production and other energy-related applications.

Graphical abstract: In situ formed VOOH nanosheet arrays anchored on a Ti3C2Tx MXene as a highly efficient and robust synergistic electrocatalyst for boosting water oxidation and reduction

Supplementary files

Article information

Article type
Paper
Submitted
25 Sep 2020
Accepted
22 Oct 2020
First published
23 Oct 2020

J. Mater. Chem. A, 2020,8, 23637-23644

In situ formed VOOH nanosheet arrays anchored on a Ti3C2Tx MXene as a highly efficient and robust synergistic electrocatalyst for boosting water oxidation and reduction

L. Yan, X. Chen, X. Liu, L. Chen and B. Zhang, J. Mater. Chem. A, 2020, 8, 23637 DOI: 10.1039/D0TA09410B

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