作为乙醇电氧化的优质催化剂的周期性五双纳米分支
Jiawei Zhang1, Jinyu Ye1, Qiyuan Fan1
1State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, College of Chemistry and Chemical Engineering , Xiamen University , Xiamen 361005 , P. R. China.
Journal of the American Chemical Society
|August 18, 2018
概括
新的循环五联Rh纳米分支对乙醇氧化反应 (EOR) 具有很高的选择性,有效地将乙醇转化为CO2. 这些纳米结构为先进的燃料电池催化剂提供了有前途的策略.
科学领域:
- 电化学
- 材料科学
- 纳米技术
背景情况:
- 直接乙醇燃料电池需要高效的乙醇氧化反应 (EOR) 的电催化剂.
- 目前的催化剂如 (Pt) 和 (Pd) 具有较差的选择性和快速降解.
- 在EOR中实现高选择性C-C债券裂变对于商业化至关重要.
研究的目的:
- 为增强乙醇氧化反应 (EOR) 开发新型电催化剂.
- 对EOR进行循环五双 (CPT) Rh纳米结构的结构-活性关系的研究.
- 提高对乙醇完全氧化到二氧化碳的选择性
主要方法:
- 容易合成自支的循环五双 (CPT) Rh 纳米分支 (NB).
- 纳米结构形态,面暴露和格子应变的表征.
- 在溶液中测试EOR的电催化性能.
- 密度函数理论 (DFT) 计算以阐明反应机制.
主要成果:
- CPT Rh NB 呈现出高百分比的开放面和 CPT 诱导的格子变异.
- 在性介质中具有优异的电催化性能.
- 在 -0.15 V 实现完全乙醇转化为 CO2 的选择性为 14.5 ± 1.1%,超过现有的催化剂.
- DFT计算证实了开放的Rh (100) 方面和拉伸应变在增强活动和选择性方面的主导作用.
结论:
- 电催化剂的表面和散装结构是提高性能的一种可行的策略.
- CPT Rh NB 显示出对 EOR 的优异活性和选择性.
- 这些发现为开发直接乙醇燃料电池的下一代电催化剂铺平了道路.
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