焦耳热驱动sp2C域调节生物质碳中,用于高性能双功能氧气电催化
Jiawei He1, Yuying Zhao2, Yang Li3
1Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, College of Chemical Engineering, Nanjing Forestry University, Nanjing, 210037, People's Republic of China.
Nano-micro letters
|April 17, 2025
概括
闪光焦耳加热增强了生物质衍生的活性碳催化剂,用于氧气电催化. 这种方法提高了空气电池的性能,为和催化剂提供了可持续的替代品.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
背景情况:
- 来自生物质的碳材料为氧气电催化剂的石墨烯催化剂提供了一个可持续的替代品.
- 目前对这些催化剂的调节策略有限,阻碍了它们的性能.
- 开发高效和可调节的生物质衍生催化剂对于推进储能技术至关重要.
研究的目的:
- 开发一种新的战略,以提高生物质衍生碳材料的电催化性能.
- 研究受控sp2-C域增强对催化剂特性的影响.
- 评估改性催化剂在氧降解和演化反应以及空气电池中的性能.
主要方法:
- 采用了快速的朱尔加热来可控地增强N-doped子甲衍生活性炭 (AC) 中的sp2-C域.
- 描述了改造AC催化剂的结构和电子特性.
- 测试了催化剂在氧减少反应 (ORR) 和氧演化反应 (OER) 中的性能.
- 在Zn-空气电池中评估了催化剂的稳定性和功率密度.
- 采用密度函数理论 (DFT) 模拟来理解增强活动的机制.
主要成果:
- 闪光焦耳加热显著改善了交流催化剂的边缘缺陷密度和图形化.
- 修改后的催化剂表现出极好的ORR性能 (半波电位为0.884VRHE) 和OER活性 (超电位为295mV在10mA cm−2).
- 在Zn-空气电池中,催化剂表现出卓越的循环稳定性 (>1200小时) 和121mW cm-2.2的峰值功率密度.
- DFT模拟证实,增强的sp2-C域负责改善的催化活性.
结论:
- 闪光焦耳加热为生物质衍生碳催化剂中sp2-C域调节提供了一个强大的策略.
- 这种方法有效地调整电子结构并加速电子转移,从而提高了电催化性能.
- 增强的生物质衍生碳催化剂在能源应用中显示出作为贵金属催化剂的经济有效替代品的巨大潜力.
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