Cooperative Catalysis toward Oxygen Reduction Reaction under Dual Coordination Environments on Intrinsic AMnO3-Type Perovskites via Regulating Stacking Configurations of Coordination Units |
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Authors: | Chunning Zhao Xilin Zhang Meng Yu Ansheng Wang Linxia Wang Lina Xue Jieyu Liu Zongxian Yang Weichao Wang |
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Affiliation: | 1. Integrated Circuits and Smart System Lab (Shenzhen), Renewable Energy Conversion and Storage Center, Tianjin Key Laboratory of Photo-Electronic Thin Film Device and Technology, College of Electronic Information and Optical Engineering, Nankai University, Tianjin, 300071 P. R. China;2. School of Physics, Henan Key Laboratory of Photovoltaic Materials, Henan Normal University, 46# Jianshe Road, Xinxiang, 453007 P. R. China |
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Abstract: | It remains challenging for pure-phase catalysts to achieve high performance during the electrochemical oxygen reduction reaction to overcome the sluggish kinetics without the assistance of extrinsic conditions. Herein, a series of pristine perovskites, i.e., AMnO3 (A = Ca, Sr, and Ba), are proposed with various octahedron stacking configurations to demonstrate the cooperative catalysis over SrMnO3 jointly explored by experiments and first-principles calculations. Comparing with the unitary stacking of coordination units in CaMnO3 or BaMnO3, the intrinsic SrMnO3 with a mixture of corner-sharing and face-sharing octahedron stacking configurations demonstrates superior activity (Ehalf-wave = 0.81 V), and charge–discharge stability over 400 h without the voltage gap (≈0.8 V) increasing in zinc–air batteries. The theoretical study reveals that, on the SrMnO3(110) surface, the active sites switch from coordinatively unsaturated atop Mn (*OO, *OOH) to Mn–Mn bridge (*O, *OH). Therefore, the intrinsic dual coordination environments of Mn–Ocorner and Mn–Oface enable cooperative modulation of the interaction strength of the oxygen intermediates with the surface, inducing the decrease of the *OH desorption energy (rate-limiting step) unrestricted by scaling relationships with the overpotential of ≈0.28 V. This finding provides insights into catalyst design through screening intrinsic structures with multiple coordination unit stacking configurations. |
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Keywords: | active site migration cooperative catalysis intrinsic dual coordination environments octahedron stacking configuration oxygen reduction reaction |
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