无形的IrOx缓冲层稳定了低价值的Ir中心,并加强了在层次多层Ir-IrCoOx中Iro杂交,以获得酸性氧的进化
Menghao Zhou1, Kai Zeng2, Xu Liang1
1School of Electrical Engineering, Institute of Smart City and Intelligent Transportation, Southwest Jiaotong University, Chengdu 610032, China.
在酸性条件下开发稳定,低电催化剂用于氧化演化反应 (OER) 是具有挑战性的. 这项研究提出了一种新的Ir/IrOx/Co3O4催化剂,通过使用IrOx缓冲层来增强活性和稳定性.
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
- 催化剂是一种催化剂.
背景情况:
- 在酸性介质中开发高活性和稳定的氧化演化反应 (OER) 的电催化剂对于能量转化技术至关重要.
- 较低的 (Ir) 负载对于成本效益是可取的,但实现高性能和稳定性仍然是一个重大挑战.
研究的目的:
- 为酸性OER设计和合成一种具有低负载的新型层次电催化剂.
- 研究无形氧化物 (IrOx) 缓冲层在增强催化剂稳定性和活性方面的作用.
- 为了证明接口合工程对于酸性OER电催化剂设计的有效性.
主要方法:
- 一个有层次的Ir/IrOx/Co3O4多层架构与空洞的纳米盒形态的合成.
- 使用操作式红外吸收光谱和外置X射线吸收光谱进行了表征.
- 在酸性介质中评估氧气演化反应的电化学性能.
主要成果:
- 无形的IrOx缓冲层有效地抑制过度氧化,稳定低Ir氧化状态.
- 与商业的IrO相比,工程催化剂具有显著增强的质量活性 (120.28 A gIr-1) 和旋转频率 (0.18 s-1).
- 接口合工程成功地减轻了Ir溶解.
结论:
- 开发的Ir-IrCoOx催化剂证明了酸性OER的卓越性能和稳定性.
- 电流Ox缓冲层在保护电流中心和调节电子性能方面发挥着至关重要的作用.
- 这项工作为先进的酸性OER电催化剂提供了一般设计策略.
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