2D Ca/Nb-based perovskite oxide with Ta doping as highly efficient H2O2 synthesis catalyst

被引:5
|
作者
Yang, Xingchen [1 ,2 ]
Gao, Yang [1 ,2 ]
Xu, Xiaohui [1 ,2 ]
Xu, Wenqiang [1 ,2 ]
Wang, Denghui [1 ,2 ]
Luo, Bin [3 ,4 ]
Liu, Dong [5 ]
Liang, Tao [6 ,7 ]
Wang, Bin [1 ,2 ]
机构
[1] Natl Ctr Nanosci & Technol, CAS Key Lab Nanosystem & Hierarch Fabricat, Beijing 100190, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] Univ Queensland, Sch Chem Engn, Nanomat Ctr, St Lucia, Qld 4072, Australia
[4] Univ Queensland, Australian Inst Bioengn & Nanotechnol, St Lucia, Qld 4072, Australia
[5] Beijing Univ Chem Technol, Coll Chem Engn, Coll Mat Sci & Engn, State Key Lab Organ Inorgan Composites, Beijing 100029, Peoples R China
[6] Univ Chinese Acad Sci, Hangzhou Inst Adv Study, Hangzhou 310024, Peoples R China
[7] Zhejiang Univ, State Key Lab Silicon Mat, Hangzhou 310027, Peoples R China
关键词
perovskite oxide; H2O2; two-electron oxygen reduction reaction; catalyst; Ca2Nb3-xTaxO10-; nanoflakes; OXYGEN-REDUCTION; HYDROGEN-PEROXIDE; RATIONAL DESIGN; FUEL-CELLS; NANOSHEETS; O-2;
D O I
10.1007/s12274-024-6496-6
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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 Ca(2)Nb(3-x)TaxO(10)- (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.
引用
收藏
页码:4934 / 4942
页数:9
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