二元金属合金电催化剂协同加速硫电池中的双向聚硫化物转换
Lianbo Ma1, Qingzhu Wu1, Man He2
1School of Materials Science and Engineering, Anhui University of Technology, Maanshan 243002, China.
Nano letters
|January 22, 2025
概括
这项研究在碳纳米纤维上引入了一种新的-合金,作为-硫电池的高效电催化剂,克服了聚硫化物穿效应,提高了性能和稳定性.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 硫 (Li-S) 电池面临着缓慢的聚硫化物氧化还原动力学和穿效应的挑战,阻碍了实际应用.
- 传统的电催化剂往往表现出单向的催化限制,需要先进的解决方案.
研究的目的:
- 开发一种高效的电催化剂,加速双向聚硫化物转换,以提高Li-S电池的性能.
- 研究嵌入碳矩阵中的二元金属 (CoNi) 合金对碳纳米纤维 (CoNi@C-CNFs) 的协同效应.
主要方法:
- 制造 CoNi@C-CNFs 作为一种新型电催化剂.
- 利用飞行时间二次离子质谱法 (TOF-SIMS) 来分析催化效应.
- 进行理论模拟以了解协同作用的相互作用.
- 进行电化学测量以评估电池性能.
主要成果:
- TOF-SIMS证实了聚硫化物与CoNi合金的增强催化转化,特别是在引入Ni后.
- 理论模拟显示了来自Co-Ni原子相互作用的协同催化增强.
- 在3.0°C下达到705mAhg-1的高特异容量和优异的长期周期稳定性.
- 证明了令人印象深刻的面积容量 (5.28 mAh cm−2) 在高硫负载 (∼6.1 mg cm−2) 时,使用稀薄的电解质.
结论:
- CoNi@C-CNFs电催化剂通过促进双向聚硫化物转化,有效地减轻了穿效应.
- 和之间的协同相互作用对于增强的催化活性至关重要.
- 这种先进的电催化剂在实际条件下显示出对高性能,稳定的硫电池显著的前景.
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