Cheng Hengxu, Sun Haojie, Dai Meizhen, Li Yucai, Wang Jian, Song Shiwei, Zhang Dong, Zhao Depeng
School of New Energy, Shenyang Institute of Engineering, Shenyang 110136, China.
Molecules. 2024 Dec 4;29(23):5721. doi: 10.3390/molecules29235721.
Developing low-cost, efficient alternatives to catalysts for bifunctional oxygen electrode catalysis in the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is critical for advancing the practical applications of alkaline fuel cells. In this study, Co particles and single atoms co-loaded on nitrogen-doped carbon (CoNC) were synthesized via pyrolysis of a CN and cobalt nitrate mixture at varying temperatures (900, 950, and 1000 °C). The pyrolysis temperature and precursor ratios were found to significantly influence the ORR/OER performance of the resulting catalysts. The optimized CoNC-950 catalyst demonstrated exceptional ORR (E = 0.85 V) and OER (E = 320 mV) activities, surpassing commercial Pt/C + RuO-based devices when used in a rechargeable zinc-air battery. This work presents an effective strategy for designing high-performance non-precious metal bifunctional electrocatalysts for alkaline environments.
开发用于氧还原反应（ORR）和析氧反应（OER）中双功能氧电极催化的低成本、高效催化剂替代品对于推进碱性燃料电池的实际应用至关重要。在本研究中，通过在不同温度（900、950和1000°C）下热解CN和硝酸钴混合物，合成了负载在氮掺杂碳（CoNC）上的钴颗粒和单原子。发现热解温度和前驱体比例对所得催化剂的ORR/OER性能有显著影响。优化后的CoNC-950催化剂表现出优异的ORR（E = 0.85 V）和OER（E = 320 mV）活性，在可充电锌空气电池中使用时超过了基于商业Pt/C + RuO的器件。这项工作为设计用于碱性环境的高性能非贵金属双功能电催化剂提供了一种有效策略。
