4.8 Article

Dynamic dissolution and re-adsorption of molybdate ion in iron incorporated nickel-molybdenum oxyhydroxide for promoting oxygen evolution reaction

期刊

APPLIED CATALYSIS B-ENVIRONMENTAL
卷 307, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.apcatb.2022.121150

关键词

Dynamic behavior; Ion effect; Promoting effect; Molybdate ion; Oxygen evolution reaction

资金

  1. National Natural Sci-ence Foundation of China [12074435, 52001335, 21872174, U1932148]
  2. Technology Cooperation Program [2017YFE0127800]
  3. Hunan Provincial Key Research and Development Program [2020WK2002]
  4. Hunan Provincial Natural Science Foundation of China [2020JJ2041, 2020JJ5691]

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This study investigates the effect of escaped inactive ion from pre-catalysts on the performance of alkaline oxygen evolution reaction (OER). The results show that the escaped ion promotes the reconstruction of the catalyst and enhances the OER activity. This finding enriches our understanding of the inactive-ion effect on alkaline OER and provides a pathway for developing efficient electrocatalysts.
Transition metal-based pre-catalysts undergo drastic reconstruction to form the active catalysts during the alkaline oxygen evolution reaction (OER). However, the effect of escaped inactive ion from pre-catalysts themselves is usually ignored during reconstruction processes. Here, we investigate the effect of inactive MoO(4)(2-& nbsp;)escaped from a pre-catalyst of Fe incorporated nickel-molybdenum oxyhydroxide (NiMo-Fe) on OER performance. The results of in-situ Raman and X-ray photoelectron spectroscopy reveal that MoO(4)(2-& nbsp;)can be easily dissolved into KOH electrolyte and re-adsorbed on surface of catalyst during OER processes, which delivers a promoting effect on OER performance. The dissolution of MoO(4)(2-& nbsp;)is beneficial for increasing the reconstruction degree of NiMo-Fe to form the active phase of NiFeOOH. Theoretical calculations demonstrate that the re adsorbed MoO(4)(2-& nbsp;)is favorable for the adsorption of the OOH* intermediate, thus boosts the OER activity. As expected, the NiMo-Fe shows a superior electrocatalytic performance for OER, outperforming the pre-catalyst without Mo species. This finding enriches the knowledge of inactive-ion effect on alkaline OER performance and offers a path for developing efficient electrocatalysts.

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