@article{Yang2024, 
author = {Xingchen Yang and Yang Gao and Xiaohui Xu and Wenqiang Xu and Denghui Wang and Bin Luo and Dong Liu and Tao Liang and Bin Wang},
title = {2D Ca/Nb-based perovskite oxide with Ta doping as highly efficient H2O2 synthesis catalyst},
year = {2024},
journal = {Nano Research},
volume = {17},
number = {6},
pages = {4934-4942},
keywords = {perovskite oxide, H2O2, two-electron oxygen reduction reaction, catalyst, Ca2Nb3–xTaxO10– nanoflakes},
url = {https://www.sciopen.com/article/10.1007/s12274-024-6496-6},
doi = {10.1007/s12274-024-6496-6},
abstract = {Perovskite oxides (POs) are emerging as a class of highly efficient catalysts for reducing oxygen to H2O. Although a rich variety of POs-based catalysts have been developed by tuning the complex composition, a highly efficient PO catalyst that is able to alter the reaction pathway from a 4e− process to a 2e− process for H2O2 production has rarely been achieved. We modified the structure and composition of a Ca- and Nb-based PO material by realizing a uniform two-dimensional (2D) morphology and varied Ta doping, resulting in the 2D Ca2Nb3−xTaxO10− (x = 0, 0.5, 1, and 1.5) monolayer catalysts. The obtained catalysts exhibit a dominant 2e− pathway and show exceptional H2O2 production efficiency. The typical Ca2Nb2.5Ta0.5O10− nanoflakes showed an onset potential of 0.735 V vs. reversible hydrogen electrode (RHE), a remarkably high selectivity over 95% across a wide range of 0.3–0.7 V, an impressively high Faradaic efficiency of 94%, and a notable H2O2 productivity of 1571 mmol·gcat−1·h−1. These findings highlight the great potential of 2D perovskite oxide nanoflakes as advanced electrocatalysts for 2e− oxygen reduction reaction.}
}