在Co3O4的旋转状态中调节装饰的Fe单原子使得可充电的空气电池性能优越
Yuhua Xie1,2, Yumei Feng2, Shiao Zhu2
1State Key Laboratory of New Textile Materials & Advanced Processing Technology, College of Materials Science and Engineering, Wuhan Textile University, Wuhan, 430200, China.
一种新的氧化物和铁单原子催化剂 (Co3O4@Fe1-NC) 提高了可充电空气电池的性能. 这种双功能电催化剂可促进氧反应,使其具有高功率密度和长期稳定性,用于实际应用.
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
- 纳米技术纳米技术
背景情况:
- 可充电的空气电池 (ZABs) 需要高性能双功能电催化剂来进行氧化演化 (OER) 和氧减少 (ORR) 反应.
- 由于缺乏高效和稳定的电催化材料,ZAB的工业化受到阻碍.
研究的目的:
- 开发一种新型的双功能电催化剂,通过使用Co3O4.4调节Fe单个原子在添加碳上的自旋状态.
- 为了研究 Co3O4 加入对 ZAB 的 Fe 单原子催化剂的电子结构和催化活性的影响.
主要方法:
- Co3O4@Fe1-NC复合电催化剂的合成.
- 电子结构 (d带中心,例如填充) 和旋转状态 (Fe,Co) 的表征.
- 对OER和ORR性能进行电化学评估,包括动力电流密度和超电位.
- 运行拉曼和电化学阻抗光谱来研究反应机制和稳定性.
- 测试ZAB性能,包括功率密度和长期循环.
主要成果:
- Co3O4@Fe1-NC对Fe具有中等的旋转状态,d带中心向下移动,eg填充增加,削弱OH*相互作用并提高ORR.
- Co3O4@Fe1-NC的ORR动力电流密度明显高于Fe1-NC和商业Pt/C.
- Co3O4@Fe1-NC表现出强大的OER活动,具有较低的超电位,表现优于Co3O4@NC和IrO2.
- 操作研究显示,在Co3O4@Fe1-NC上具有平衡的OH*吸附/脱质,确保稳定性.
- 基于Co3O4@Fe1-NC的ZAB实现了高功率密度 (193.2mW cm-2) 和长期稳定性 (200小时),对于全固态ZAB来说,结果很有希望.
结论:
- Co3O4调制策略有效调整单个Fe原子的电子结构,从而提高ZABs的双功能电催化活性.
- 与现有的催化剂相比,Co3O4@Fe1-NC的性能和稳定性优越,为实际的可充电空气电池铺平了道路.
- 这些发现为设计用于储能应用的先进单原子电催化剂提供了新的途径.
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