核心外协同催化与高性能室温Na-S电池的接口工程相结合.
Daliang Fang1, Tanmay Ghosh2, Shaozhuan Huang3
1Pillar of Engineering Product Development, Singapore University of Technology and Design, 8 Somapah Road, Singapore, 487372, Singapore.
这项研究开发了一种用于室温硫电池的新型双催化剂阴极,显著提高了性能. 新的设计增强了减少硫的效果,并抑制了穿效应,从而实现了长期的,高容量的能量存储.
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:
- 室温硫电池 (RT Na-S) 面临着缓慢的氧化还原动力学和穿效应的挑战,这限制了它们的实际应用.
- 单一的催化剂不足以解决复杂的,多步骤的硫氧化还原过程.
研究的目的:
- 设计和制造具有双催化剂的阴极材料,以克服RT Na-S电池的局限性.
- 为了提高整个硫氧化转化过程的催化效率.
主要方法:
- 用添加的核心外碳纳米圈的制造,与ZnS纳米晶体 (核心) 和孤立的Ni-N4位点 (外) 集成.
- 研究ZnS和Ni-N4对减少硫和聚硫化物转换的协同催化作用.
- 阴极-电解质接口 (CEI) 的特性和电化学性能.
主要成果:
- ZnS核心有效地将S8减少到Na2Sx,而Ni-N4外催化Na2Sx转化为Na2S.
- Ni-N4位点促进了富含无机物CEI,有效地抑制了穿效应.
- 该ZnS-NC@Ni-N4/S阴极实现了卓越的速率性能 (650mAhg-1在5Ag-1) 和超长周期稳定性 (2000周期每周期衰减0.011%).
结论:
- 开发的双催化剂阴极材料显著提高了RT Na-S电池的电化学性能.
- 这项工作为高性能硫电池的多催化剂系统提供了合理的设计策略.
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