Doped-nitrogen enhanced the performance of Nb2CTx on the electrocatalytic synthesis of H2O2

作者：Shijie Zhang, Jingnan Zheng, Junming Lin, Yuanan Li, Zhikang Bao, Xiaoge Peng, Wenkai Ji, Lei Ding, Zaixiang Xu, Guo‐Liang Wang, Xing Zhong, Jianguo Wang · 发表于：Nano Research · 年份：2022 · DOI：10.1007/s12274-022-5051-6 · 被引用次数：27 · 研究领域：MXene and MAX Phase Materials、Electrocatalysts for Energy Conversion、Fuel Cells and Related Materials

Electrochemical oxygen reduction reaction (ORR) for preparing hydrogen peroxide (H 2 O 2 ) is a promising way to replace the anthraquinone method. The key to H 2 O 2 production is the development of catalysts to regulate the oxygen reduction reaction pathway. Here, nitrogen-doped Nb 2 CT x was prepared by NH 3 annealing method. Compared with precursor Nb 2 AlC (67.01%) and pure Nb 2 CT x (75.70%), nitrogen-doped Nb 2 CT x exhibited excellent performance for 2e − ORR with > 90% H 2 O 2 selectivity (at 0.4 V vs. reversible hydrogen electrode (RHE)). Faradic efficiency of nitrogen-doped Nb 2 CT x reached 80.75%, whereas those for Nb 2 AlC and Nb 2 CT x were 60.35% and 39.27%, respectively. A desirable catalytic stability for 50 h was observed. Density functional theory (DFT) calculations indicated excellent activity of the nitrogen-doped Nb 2 CT x was attributed to the introduction of N. This excellent activity was conducive to the adsorption of oxygen and promoted the formation of the OOH intermediate. This work can serve as an important reference for regulating the electronic structure of MXene to expand the application area in the electrochemical field.