在Pd纳米粒子上对CO2的尺寸依赖的电催化降低
Dunfeng Gao1,2, Hu Zhou3, Jing Wang1,2
1†State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
Journal of the American Chemical Society
|March 10, 2015
概括
纳米颗粒 (Pd NPs) 的大小显著影响二氧化碳 (CO2) 电还原. 较小的PdNP提高了二氧化碳转化效率和选择性,这对于可再生能源储存至关重要.
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:
- 纳米粒子大小会影响催化性能.
- 了解二氧化碳电减的尺寸效应对于可再生能源和碳利用至关重要.
- 纳米粒子 (PdNP) 是减少二氧化碳的关键催化剂.
研究的目的:
- 研究PdNP在CO2电还原中的显著大小依赖活性和选择性.
- 确定有效的CO生产的最佳Pd NP大小.
- 阐明NP表面结构与催化性能之间的关系.
主要方法:
- 用不同大小的Pd NP (2.410.3 nm) 进行电催化CO2减排实验.
- 密度函数理论 (DFT) 计算来分析反应机制和能量.
- 分析法拉第克效率,电流密度和周转频率.
主要成果:
- 法拉戴克对二氧化碳生产的效率从5.8% (10.3 nm NP) 增加到91.2% (3.7 nm NP).
- 电流密度显示,随着NP大小的下降,电流密度增加了18.4倍.
- 与露台站点相比,DFT计算显示,边缘/角落站点的二氧化碳吸附和COOH*中间形成更容易.
结论:
- Pd NP的大小是调整二氧化碳电还原活性和选择性的关键因素.
- 较小的Pd NP具有较高的边缘/角位比率,对CO产生更有效.
- 控制NP大小可以优化二氧化碳吸附,中间体形成和产品去除,从而提高催化效果.
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