对核心外结构的普鲁士蓝色类似物进行控制的建造,以实现增强的氧气减少
Han Tian1, Chang Chen1,2, Ziyi Yu1
1Shanghai Institute of Ceramics, Chinese Institute of Sciences, Shanghai, 200050, P. R. China.
ChemSusChem
|October 6, 2023
概括
新的金属有机框架 (MOF) 为高效的氧降解反应 (ORR) 电催化剂提供了低温合成途径. 这些水稳定MOF的性能与/碳 (Pt/C) 相美.
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:
- 金属有机框架 (MOF) 是氧降解反应 (ORR) 的有希望的电催化剂.
- 传统的MOF合成需要高温,往往导致水的稳定性差,阻碍工业用途.
- 开发基于MOF的强大和高效的ORR催化剂对于能源应用至关重要.
研究的目的:
- 为水稳定的MOF电催化剂开发一种简单的低温合成方法.
- 为了研究Mn和Fe联合装载的与核心外结构的普鲁士蓝色类似物的ORR性能.
- 评估这些新型催化剂在空气电池中的潜力.
主要方法:
- 使用低温离子交换方法合成和铁共载的普鲁士蓝色类似物.
- 通过控制的Mn和Fe负载实现了核心结构框架.
- 对ORR的电催化性能使用旋转盘电极 (RDE) 电压测量进行了评估.
- 评估了空气电池的性能,包括功率密度和长期稳定性.
主要成果:
- 合成的催化剂呈现出核心外结构,外中缩的Mn.
- 最优的催化剂 (HMPB-2.6Mn) 显示出高ORR半波潜力为0.86V.
- 催化剂实现了空气电池功率密度为119 mW cm-2.2.
- 经过60个小时的操作,观察到微不足道的降解,与商业Pt/C相比.
结论:
- 一种简单的低温离子交换方法成功地产生了水稳定的Mn和Fe共载的普鲁士蓝色类似物.
- 核心-外结构和协同的Mn-Fe相互作用是增强ORR活动和稳定的关键.
- 这些基于MOF的电催化剂在空气电池等能量转换装置中显示出可用于工业应用的巨大潜力.
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