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Enhancing Oxygen Evolution Reaction Activity in NiCo2O4 Catalysts Through Morphology and Oxygen Vacancy Engineering
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Abstract
En 中文
Developing oxygen evolution reaction (OER) catalysts that combine high performance with cost-effectiveness is a critical challenge for advancing the commercialization of anion exchange membrane water electrolysis (AEMWE). Practical application is often hindered by issues such as poor batch reproducibility and low-cost efficiency. To address these limitations, this study proposes a morphology-engineering strategy centered on oxygen vacancy modulation. Using nickel cobaltite as a model system, this strategy employs a low-cost, low-alkalinity solution medium and a gradient annealing process to achieve an optimal combination of tailored morphology and controlled oxygen vacancy concentration. Experimental characterization and density functional theory (DFT) calculations reveal that an appropriate annealing temperature (400 degrees C) effectively constructs active coordination sites, facilitates the proton-coupled electron transfer process, and thereby significantly enhances the OER performance. The performance loss after continuous operation for 112 h in the AEMWE single-cell device is negligible, highlighting its excellent uniformity and stability. This work not only confirms the crucial role of the oxygen-vacancy-modulated morphology-engineering strategy in improving the OER performance of spinel oxides but also provides important insights and a technical pathway for designing highly active catalysts suitable for practical water electrolysis systems. (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic) (OER) (sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic) (AEMWE) (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic)(sic)(sic)(sic)(sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic)(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic) (DFT) (sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic) (400 degrees C) (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)-(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)OER(sic)(sic).(sic)AEMWE(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)112 h(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)OER(sic)(sic)(sic)(sic)(sic)(sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).
Keywords:
anion exchange membrane
density functional theory
nickel cobalt oxide
oxygen evolution reaction
oxygen vacancies
water electrolysis
AI Summary
Key information extracted from the uploaded paper, including a brief overview, abstract, background, key highlights, visual analysis, and future outlook.
Journal
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11
Papers:
4.9K
Citations:
1.7W
Organization
Cited Papers