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Chemical Engineering Journal

Chemical Engineering Journal

IF: 13.3
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Localized lattice strain in perovskite oxides for enhanced oxygen reduction reaction kinetics in solid oxide fuel cells

Published:12 December 2024 DOI: 10.1016/j.cej.2024.158541
Xiaodan Yu, Rongzheng Ren, Chunming Xu, Jinshuo Qiao, Wang Sun, Kening Sun, Zhenhua Wang

Abstract

The cathode of a solid oxide fuel cell (SOFC) must exhibit both high activity and robust durability for effective utilization in electrochemical oxygen reduction reactions (ORR). To address this challenge, we present a novel strain engineering strategy that involves the creation of nanoscale local lattice strain microdomains to further enhance the ORR kinetics. Specifically, Ga cations are introduced into some of the B-sites of the perovskite Pr0.4Sr0.6Fe0.5Co0.5O3-δ (PSFC). Benefiting from local lattice strain engineering, the bulk oxygen migration coefficient of the locally strained PSFC sample is significantly enhanced, reaching twice that of the pure PSFC sample at 650?°C. Moreover, the polarization impedance of PSFC (0.102?Ω·cm2) is more than twice that of Pr0.4Sr0.6Fe0.4Co0.5Ga0.1O3-δ (PSFCG, 0.043?Ω·cm2) at 800?°C. Microscopic structural analyses and computational calculations indicate that the optimized electronic structure of the rich micro-strain catalyst reduces the bond energy of adjacent B-O bonds and the oxygen transport barrier. This work demonstrates a practical local lattice micro-strain engineering strategy and provides a new approach for improving the performance of ORR electrocatalysts.

Substances (3)

Materials
Procduct Name CAS Molecular Formula Supplier Price
Citric acid 77-92-9 C6H8O7 2177 suppliers $5.00-$2290.00
Ethylenediaminetetraacetic acid 60-00-4 C10H16N2O8 1461 suppliers $6.00-$6397.62
Cobaltous nitrate hexahydrate 10026-22-9 CoH12N2O12 384 suppliers $17.47-$2051.53

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