In:
Angewandte Chemie, Wiley, Vol. 133, No. 51 ( 2021-12-13), p. 26951-26958
Abstract:
Modulation of A‐site defects is crucial to the redox reactions on ABO 3 perovskites for both clean air application and electrochemical energy storage. Herein we report a scalable one‐pot strategy for in situ regulation of La vacancies (V La ) in LaMnO 3.15 by simply introducing urea in the traditional citrate process, and further reveal the fundamental relationship between V La creation and surface lattice oxygen (O latt ) activation. The underlying mechanism is shortened Mn−O bonds, decreased orbital ordering, promoted MnO 6 bending vibration and weakened Jahn–Teller distortion, ultimately realizing enhanced Mn‐3d and O‐2p orbital hybridization. The LaMnO 3.15 with optimized V La exhibits order of magnitude increase in toluene oxidation and ca. 0.05 V versus RHE (reversible hydrogen electrode) increase of half‐wave potential in oxygen reduction reaction (ORR). The reported strategy can benefit the development of novel defect‐meditated perovskites in both heterocatalysis and electrocatalysis.
Type of Medium:
Online Resource
ISSN:
0044-8249
,
1521-3757
DOI:
10.1002/ange.v133.51
DOI:
10.1002/ange.202111610
Language:
English
Publisher:
Wiley
Publication Date:
2021
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