在酸氧演化反应下了解IrFeCoNiCu高合金纳米颗粒的结构演化
Arifin Luthfi Maulana1,2, Peng-Cheng Chen2,3,4, Zixiao Shi5,6
1Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, California 94720, United States.
Nano letters
|July 5, 2023
概括
高合金纳米粒子作为酸氧演化反应 (OER) 的催化剂非常有前途. 一个IrFeCoNiCu-HEAs催化剂表现出卓越的活性和稳定性,在运行过程中形成了活性的富含Ir的外.
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:
- 高合金 (HEA) 纳米颗粒正在成为氧化演化反应 (OER) 的强大催化剂.
- 酸性OER催化剂对于能源转换技术至关重要,但经常面临稳定性挑战.
研究的目的:
- 合成和评估IrFeCoNiCu-HEA纳米颗粒作为酸性OER的电催化剂的性能.
- 在OER条件下研究HEA纳米颗粒的结构演变和活性部位形成.
主要方法:
- 使用微波辅助冲击合成,在碳纸基板上制备IrFeCoNiCu-HEA纳米粒子.
- 进行了电化学表征,包括0.1M HClO4中的OER活性和稳定性测试.
- 使用in-situ/operando分析来研究电化学激活期间的表面结构演变.
主要成果:
- 该IrFeCoNiCu-HEA纳米颗粒表现出极好的OER活性,在10mA cm-2时超电位为~302mV.
- 与单金属IR相比,HEA催化剂在12小时的运行中表现出更好的稳定性.
- 由于3d金属溶解,在HEA表面形成了具有纳米领域特征的活性,富含Ir的外层,而核心保持了其单相HEA结构.
结论:
- 铁铁-HEA纳米粒子是酸性OER的高效电催化剂,提供卓越的活性和稳定性.
- 形成一个动态的,富含的表面层是提高催化性能的关键.
- 这项研究强调了HEA纳米颗粒在酸性操作条件下可调节的近表面结构动态.
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