Improving the oxygen evolution reaction : exsolved cobalt nanoparticles on titanate perovskite catalyst
Date
15/03/2024Grant ID
EP/T019298/1
EP/X038963/1
EP/R023522/1
EP/R023522/1
EP/R023751/1
Keywords
Metadata
Show full item recordAbstract
Perovskites are an important class of oxygen evolution reaction (OER) catalysts due to highly tunable compositions and adaptable characteristics. However, perovskite-based catalysts can have limited atom utilization efficiency due to large particle size, resulting in low mass activity. Herein, Cobalt nanoparticles are exsolved from La0.2+2xCa0.7-2xTi1-xCoxO3 perovskite and applied in OER. Upon reduction in the 5% H2/N2 atmosphere at 800 °C for 2 h, the Co exsolved perovskite catalyst (R-LCTCo0.11) exhibits optimal OER performance. The mass activity of R-LCTCo0.11 reaches ≈1700 mA mg−1 at an overpotential of 450 mV, which is 17 times and 3 times higher than that of LCTCo0.11 (97 mA mg−1) and R-Mix (560 mA mg−1) catalysts respectively, surpassing the benchmark catalyst RuO2 (42.7 mA mg−1 of oxide at η = 470 mV). Electrochemical impedance spectroscopy (EIS) data reveals that R-LCTCo0.11 has the lowest charge transfer resistance (Rct = 58 Ω), demonstrating the highest catalytic and kinetic activity for OER. Furthermore, this catalyst shows high stability during an accelerated durability test of 10 h electrolysis and 1000 cycles cyclic voltammetry (CV). This work demonstrates that nanoparticle exsolution from a doped perovskite is an effective strategy for improving the atom utilization efficiency in OER.
Citation
Zuo , S , Liao , Y , Wang , C , Naden , A B & Irvine , J T S 2024 , ' Improving the oxygen evolution reaction : exsolved cobalt nanoparticles on titanate perovskite catalyst ' , Small , vol. 20 , no. 11 , 2308867 . https://doi.org/10.1002/smll.202308867
Publication
Small
Status
Peer reviewed
ISSN
1613-6810Type
Journal article
Description
Funding: The authors acknowledge the support from Fundamental Research Funds for Engineering and Physical Sciences Research Council (EPSRC) Critical Mass grant EP/R023522/1, Light element Analysis Facility Grant EP/T019298/1, Strategic Equipment Resource grant EP/R023751/1, and China Scholarship Council (CSC).Collections
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