Abstract
Perovskite with the general formula ABO3 has received great interest in the application of fuel cells. The catalytic performances of perovskite can be significantly influenced by regulating the A-site non-stoichiometric in direct methanol oxidation fuel cells. Herein, an A-site, non-stoichiometric nickel-based perovskite LaxNiO3 was synthesized and introduced as a catalyst for the electrochemical oxidation of methanol in fuel cells. Results show that La0.95NiO3 exhibits a better onset potential of approximately 0.369 V. The current density is obtained with 52 mA/cm2 at 0.6 V, which is 1.85 times higher than that of the standard perovskite LaNiO3. The catalytically active area of the catalyst was found to be strongly related to its La concentration. A high active area of 112.98 cm2 for A-site-deficient La0.95NiO3 was demonstrated at different sweep rates (10–100 mV/s). The density functional theory was employed to analyze the energy band structures, D-band centers, and methanol adsorption energy of a standard perovskite and the A-site-deficient perovskite. The Fermi level of the A-site-deficient perovskite La0.95NiO3 catalyst spans more energy bands. Furthermore, catalyst La0.95NiO3 has a higher D-band center (− 1.78 eV) and adsorption energy (− 1.21 eV), suggesting the A-site deficiency can produce the desired methanol oxidation reaction (MOR) catalyst activity.
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The project was financially supported by the National Natural Science Foundation of China (51772017).
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Chen, NH., Song, TY., Li, YF. et al. Elevated electrocatalytic performance of A-site non-stoichiometric LaxNiO3 perovskites towards methanol oxidation reaction in NaOH solution. J Solid State Electrochem 27, 479–487 (2023). https://doi.org/10.1007/s10008-022-05341-5
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DOI: https://doi.org/10.1007/s10008-022-05341-5