Abstract
Transition-metal complexes are candidates for replacing platinum and its combinations with other metals as catalysts for the hydrogen oxidation reaction (HOR) in proton-exchange membrane fuel cells (PEMFCs). The results of catalytic tests of bis(diphosphine) coordination complexes of nickel [Ni(PPh2NPh2)2]·2BF4 and [Ni(PPh2NBn2)2]·2BF4 in liquid-phase oxidation of hydrogen and as components of catalysts for the HOR in PEMFC are analyzed. It was found that the latter complex is a much more efficient catalyst for the HOR in PEMFC than the former. ESR studies demonstrated an increase in the difference between the hyperfine coupling constants on phosphorus nuclei on going from [Ni(PPh2NPh2)2] · 2BF4 to [Ni(PPh2NBn2)2]·2BF4. Significant morphological differences between the complexes on the atomically smooth surface of pyrolytic graphite were revealed by atomic force microscopy.
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Dedicated to Academician of the Russian Academy of Sciences V. I. Ovcharenko on the occasion of his 70th birthday.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1402–1409, July, 2022.
The authors are grateful to the staff of Assigned Spectral-Analytical Center of Shared Facilities for Study of Structure, Composition, and Properties of Substances and Materials of the Federal Research Center “Kazan Scientifi c Center of the Russian Academy of Sciences” for help in conducting the research and discussing the results; to the Kazan National Research Technological University and to the Kazan National Research Technical University for providing test equipment, and to Candidate of Sciences (Chem.) M. N. Khri zanforov for carrying out electrochemical measurements using the carbon paste electrode.
This work was carried out within the framework of the State Assignment to the Federal Research Center “Kazan Scientific Center of the Russian Academy of Sciences”.
No human or animal subjects were used in this research.
The authors declare no competing interests.
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Kadirov, M.K., Karasik, A.A., Kadirov, D.M. et al. Biomimetic molecular anode catalysts based on nickel bis(diphosphine) coordination complexes for proton-exchange membrane fuel cells. Russ Chem Bull 71, 1402–1409 (2022). https://doi.org/10.1007/s11172-022-3546-7
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DOI: https://doi.org/10.1007/s11172-022-3546-7