用于氧化水的高性能低催化剂:通过胺兴奋剂打破IrO2的远程顺序
Yifan Wang1,2, YuFeng Qin1,2, Rou Wen1,2
1State Key Laboratory of Chemical Resource Engineering, Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology, Beijing, 100029, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|August 20, 2024
概括
为氧化演化反应 (OER) 开发高效的低电催化剂是质子交换膜水电解 (PEMWE) 的关键. 将氧化 (IrO2) 与 (Nd) 进行兴奋剂,为PEMWE创造了一种具有增强活性和耐久性的新型催化剂.
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:
- 质子交换膜水电解 (PEMWE) 需要高效的电催化剂来进行氧化演化反应 (OER).
- 低 (Ir) 基催化剂对于大型PEMWE应用至关重要,因为的成本很高.
- 开发非贵金属化催化剂为传统的氧化提供了一个有希望的替代品.
研究的目的:
- 为OER设计和研究一种新的低电催化剂.
- 了解兰化物兴奋剂对IrO2.2的结构和电子效应.
- 评估PEMWE开发的电催化剂的催化性能和耐用性.
主要方法:
- 合成 (Nd) 加的氧化 (IrO2) 电催化剂.
- 使用分析晶体结构和原子排列的技术进行结构性表征.
- 电化学测试以评估OER活动,包括超电位和质量活动.
- 在高电流密度下进行耐用性测试.
主要成果:
- 的注导致了IrO2中一个混乱但短距离的有序结构,形成了--键并增加了氧空缺 (Ov).
- Nd-doped催化剂表现出显著增强的OER活性,具有较低的超电位 (263 mV在10 mA cm-2) 和高质量活性 (216.98 A gIr-1),比商业Iro2高八倍.
- 催化剂表现出优越的耐用性,在50 mA cm-2下运行20小时,相比商业的IrO2的3小时,归因于Nd的氧化抑制作用.
结论:
- 兴奋剂有效地改变了IrO2的电子结构,削弱了中间吸附,并促进了OER的晶格氧机制 (LOM).
- 二氧化为PEMWE提供了一个高效和耐用的低电催化剂.
- 这项研究为设计用于清洁能源应用的先进电催化剂提供了宝贵的见解.
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