探索 Cu-Doped Co3O4双功能氧气电催化剂用于水性 Zn-Air 电池
Asutosh Behera1, Deepak Seth2, Manish Agarwal3
1Solid State and Structural Chemistry Unit (SSCU), Indian Institute of Science, Bengaluru 560012, India.
ACS applied materials & interfaces
|April 1, 2024
概括
用铜合的氧化物 (用Cu合的Co3O4) 增强了水性空气电池的氧气电催化. 这种稳定,双功能的催化剂改善了氧气减少和演化反应,提高了电池的性能.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 高效的氧气电催化对于金属空气电池,特别是水性空气电池至关重要.
- 开发稳定和有效的双功能电催化剂,以减少氧 (ORR) 和氧进化 (OER),对于推进电池技术至关重要.
研究的目的:
- 研究铜剂对氧化物 (Co3O4) 作为水性Zn-空气电池的双功能电催化剂的影响.
- 优化Cu-doping度以提高ORR和OER活动,并了解潜在的机制.
主要方法:
- 用不同度 (≤5%和≥5%) 的Cu合Co3O4的合成和表征.
- 通过X射线衍射 (XRD),拉曼光谱和分子动力学 (MD) 计算来确定铜离子位点占用率.
- 温度依赖磁化测量和密度函数理论 (DFT) 计算,以分析电子结构和催化机制.
主要成果:
- 最佳的Cu兴奋剂 (≤5%) 导致Cu离子驻留在Co3O4的八面位,增加表面Co3+度和氧气空缺,有利于OER.
- 在Cu@Oh位点的Co3+离子有利的d轨道配置和旋转状态过渡增强了性介质中的ORR活性.
- 作为水性Zn-空气电池中的双功能催化剂,添加的Co3O4 (≤5%) 实现了84mW/cm2的功率密度,超过210个周期的稳定可循环,以及0.92V的低充/放电超电位.
结论:
- 在最佳度 (≤5%) 的铜剂将Co3O4转化为水性Zn-空气电池的高效和稳定的双功能电催化剂.
- 该研究阐明了Cu兴奋剂诱导的结构和电子修改,提供了对增强ORR/OER性能的见解.
- 证明的性能突出显示了 Cu-doped Co3O4 在下一代储能器件的实际应用中的潜力.
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