Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 316, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2022.121602
Keywords
Fe-doped NiOOH; Oxygen evolution reaction; In-situ Raman; DFT calculation
Funding
- National Key Research and Development Program of China [2021YFB3801600]
- R & D Program of Zhejiang [2022C01151, 2022C01218]
- National Natural Science Foundation of China [21872121, 21908189]
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In this study, the effect of iron incorporation on the phase structure transform and regulation of intermediate species in Fe incorporated Ni-based catalysts was investigated. The results provide new insights into the activity origins of NiFe-based catalysts.
Fe incorporated Ni-based electrocatalysts have emerged as one of the most active oxygen-evolving catalysts under alkaline conditions and deciphering the effect of iron incorporation in enhancing the activity is chal-lenging but critical for the catalyst design. Herein, the as-prepared nanocube Ni-based catalysts underwent a reconstruction process and transformed from gamma-NiOOH to beta-NiOOH structure by iron incorporation under the applied bias, which was confirmed by in-situ Raman measurement. According to the methanol oxidation current response difference, the hydroxyl adsorption intensity was proposed to be regulated by iron incorporation and the rate-determining step would be the formation of *OOH for Fe-doped beta-NiOOH, which was further supported by DFT calculation. This work reveals the effect of iron-doped on the phase structure transform and the regu-lation of intermediate species elaborately and offers new insight on the understanding of the activity origins for NiFe-based catalysts.
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