来自硫-胺共聚的层次性多孔管中的S和O协调的Mo单位,用于氧降低和进化
Yongzhi Zhao1, Zili Zhang1,2, Luan Liu1
1Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China.
Journal of the American Chemical Society
|November 4, 2022
概括
研究人员使用独特的共聚化策略开发了一种新的双功能单原子催化剂 (SAC). 这种催化剂显著增强了高性能可充电空气电池的氧减和演化反应.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 高性能可充电Zn空气电池需要高效的双功能催化剂来减少氧气 (ORR) 和氧气演变 (OER).
- 非贵金属单原子催化剂 (SAC) 提供低成本和高原子利用率,但高活性双功能版本仍然稀缺.
- 开发先进的催化剂对于改善储能技术至关重要.
研究的目的:
- 合成一种新型的双功能单原子催化剂 (SAC),具有优化的O/S协调,以提高ORR和OER活性.
- 研究可充电Zn空气电池中的新Mo SAC的催化性能.
- 将催化剂的性能与商业基准进行比较
主要方法:
- 采用纳米空间限制的硫胺共聚化策略,以创建具有O/S协调性的Mo SAC (Mo-O2S2-C).
- 催化剂被支在多层层,层层的空洞管道上,以改善活性部位的暴露和质量转移.
- 进行了电化学测试以评估ORR和OER活性,并将催化剂组装到Zn-air电池中进行性能评估.
主要成果:
- -O2S2-C催化剂表现出优异的ORR活性和低的OER超电位 (324 mV在10 mA cm-2),超过了许多报告的基催化剂.
- 层次性的多孔结构促进了质量转移,并暴露了更多活跃的部位.
- 由此产生的 Zn-空气电池实现了高功率密度 (197.3 mW cm-2) 和长寿命 (50 小时),超过了商用 Pt/C+IrO2 催化剂.
结论:
- 在O/S协调下开发的Mo SAC代表了非贵金属催化剂在能源应用中的重大进步.
- 独特的合成策略和催化剂结构为设计高效电催化剂提供了有前途的途径.
- 这项工作为下一代可充电Zn空气电池提供了可行的替代品.
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