减少Ir重量TiO2的反应性和稳定性 支持氧气演化催化剂用于质子交换膜 (PEM) 水电解阳极
Hoang Phi Tran1,2, Hong Nhan Nong1, Matej Zlatar3,4
1Department of Chemistry, Chemical Engineering Division, The Electrochemical Energy, Catalysis and Materials Science Laboratory, Technische Universität Berlin, Straße des 17. Juni 124, 10623 Berlin, Germany.
Journal of the American Chemical Society
|November 11, 2024
概括
这项研究引入了一种新的TiO2支持的Ir@IrO(OH) 核心催化剂,该催化剂可显著降低绿色生产的需求. 这种新型催化剂可以提高水电解剂的氧化反应活性和稳定性.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 减少 (Ir) 需求对于绿色生产的质子交换膜水电解器 (PEM WE) 的经济可行性至关重要.
- 基于的催化剂对于PEM WE中的氧化演化反应 (OER) 是必不可少的,但它们的高成本需要提高效率.
研究的目的:
- 发现和描述一种具有减少含量的新型催化剂,以提高PEM WE中的OER性能.
- 研究新催化剂在运行条件下的结构-活动关系和稳定性.
主要方法:
- 支持TiO2的Ir@IrO(OH) 核心外纳米粒子的合成和表征.
- 使用操作XAS和ICP-MS等技术对OER活性和稳定性的电化学评估.
- 微观分析 (HAADF-EDX),以了解催化剂形态和催化剂支持相互作用 (CSI).
主要成果:
- 通过Ir@IrO(OH) /TiO2核心外催化剂实现显著增强的OER质量活性 (约2%) 与商业参考资料相比,A gIr-1 的VRHE为1.53.
- 减少了负荷,使利用率降至0.075gIr/kW-1,从而实现了可行的阳极层厚度.
- 催化剂表现出异常的形态稳定性和强大的CSI,操作XAS显示可逆的Ir-O键收缩和活性电友O-I物种的形成.
结论:
- 支持TiO2的Ir@IrO(OH) 核心外纳米粒子催化剂为减少绿色生产中的消耗提供了有希望的途径.
- 强烈的催化剂支持相互作用和Ir-O键的动态演变是增强催化活性和稳定性的关键.
- 这些发现为更具成本效益和可持续的PEM水电解技术铺平了道路.
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