用双原子催化剂促进电化学反应,用于高速硫电池
Jing Yu1,2, Oleg Usoltsev3, Irina Martynova1
1Catalonia Institute for Energy Research (IREC), Sant Adrià de Besòs, Barcelona, Catalonia, 08930, Spain.
Advanced materials (Deerfield Beach, Fla.)
|September 22, 2025
概括
研究人员在碳化物上开发了过渡金属-比斯原子对,以加速-硫电池反应. 这一战略通过促进硫化快速核化和提高电荷-放电率来增强能量储存.
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:
- 硫阴极对高能量密度,成本效益和可持续的储能充满希望.
- 缓慢的硫氧化还原反应 (SRR) 限制了硫电池 (LSB) 中硫阴极的实际应用.
研究的目的:
- 开发一种可扩展和具有成本效益的策略,用于合成催化剂,以激活LSB中的SRR.
- 为了研究在碳化物 (CN) 上固定的3D过渡金属-双 (TM-Bi) 原子对对增强LSB性能的潜力.
主要方法:
- TM-Bi/CN催化剂的合成.
- 电化学分析,包括速率性能和稳定性测试.
- 密度函数理论 (DFT) 计算和操作光谱学.
主要成果:
- 确定Ni-Bi/CN和Co-Bi/CN催化剂在改善LSB速率性能方面具有高度有效性.
- 这些催化剂促进了直接的电化学转换和快速的Li2S核化,而不是竞争的化学途径.
- 催化剂增强的LSB显示了高的电荷放电率,最大限度地减少了活性物质的损失,并提高了稳定性.
结论:
- 加快电化学过程,特别是Li2S核化,对于最大限度地减少硫损失和在LSB中实现高速性能至关重要.
- 在CN上的TM-Bi原子对通过调节电子结构并促进有效的电荷传输来有效地激活SRR.
- 这些发现为设计LSB和其他电催化应用的先进催化剂提供了洞察力.
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