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N-containing biochar-wrapped Co nanoparticles supported on N-doped graphitic carbon for efficient alkaline oxygen and hydrogen evolution reactions
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DOI：10.1016/j.ijhydene.2024.12.488.png)
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Abstract
En 中文
Significant advancements have been made in the development of bifunctional electrocatalysts for the comprehensive water splitting in alkaline electrolytes. However, the creation of inexpensive, abundant, and efficient non-precious alternatives through effective strategies remains a formidable task. In this study, a simple impregnation-pyrolysis approach was employed to fabricate nitrogen-containing biochar-encapsulated cobalt nanoparticles supported on nitrogen-doped graphitic carbon electrocatalysts. By varying the pyrolysis temperature and the amount of grapefruit peel, the catalyst optimized under conditions of 700 degrees C and 2.5000 g of grapefruit peel exhibits the lowest overpotentials of 340 mV for the oxygen evolution reaction and 120 mV for the hydrogen evolution reaction at 10 mA cm-2 under alkaline conditions, respectively. Furthermore, it exhibits exceptional electrocatalytic stability, maintaining negligible overpotentials even after undergoing 2000 CV cycles, with good preservation of its structure and morphology. This study offers an environmentally friendly, and efficient approach for the fabrication of high-performance bifunctional electrocatalysts.
Keywords:
Biochar-wrapped Co nanoparticle
Bifunctional electrocatalyst
Hydrogen evolution reaction
Oxygen evolution reaction
Journal
IF:
8.3
Papers:
5.4W
Citations:
23.1W