基于IrPdCuFeNiCoMo的核心外二面体纳米晶体和纳米,用于高效和强大的酸性氧进化
Mairui Long1, Siyuan Lai1, Kanghua Miao1
1New Energy Research Institute, School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China.
Angewandte Chemie (International ed. in English)
|December 4, 2024
概括
在酸性介质中合成高合金纳米以进行高效的氧化演化反应 (OER). 这些催化剂在水电解剂中表现出色的性能和稳定性,为催化提供了有前途的进步.
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:
- 在酸性介质中设计高效和强大的氧化演化反应 (OER) 催化剂对于电化学应用至关重要.
- 高合金 (HEAs) 具有独特的特性,但它们作为催化剂的应用,尤其是纳米晶体形式,仍然具有挑战性.
- 通过形状控制合成对HEA纳米晶体进行面向工程是一种有希望但未被充分探索的策略.
研究的目的:
- 开发一种基于Ir的新型高合金 (HEA) 纳米晶催化剂,用于在酸性条件下有效且稳定的氧演化反应 (OER).
- 为了研究HEA纳米的结构-属性关系,以增强催化活性.
- 为了评估合成的HEA纳米在质子交换膜水电解器中的性能.
主要方法:
- 使用湿化学还原方法,对具有PdCu核心和IrPdCuFeNiCoMo HEA外的icosahedral纳米晶体进行形状控制的合成.
- 序列选择性化学蚀刻PdCu核心以形成IrPdCuFeNiCoMo HEA纳米.
- 在传统的三电极电池和质子交换膜水电解仪中进行电化学表征.
- 理论计算以了解增强的催化活动的起源.
主要成果:
- 成功合成了具有独特核心外结构的IrPdCuFeNiCoMo HEA纳米.
- 在HEA纳米展现了一个低的超电位235mV在10mAcm-2和一个小的塔菲尔斜率51.0mVdec-1.1.
- 证明了特殊的稳定性,在500 mA cm−2的质子交换膜水电解器中运行超过900小时.
- 在1.50V与RHE相比,达到1624A gIr−1的高质量活动.
结论:
- 合成的IrPdCuFeNiCoMo HEA纳米是OER在酸性介质中的高效和强大的电催化剂.
- 增强的活动归因于OER中间体的约束能的广泛分布,打破了缩放关系.
- 这项工作为设计用于能源转换应用的先进HEA催化剂提供了新的策略.
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