单分散的Au纳米粒子用于选择性电催化降低CO2到CO的过程
Wenlei Zhu1, Ronald Michalsky, Önder Metin
1Department of Chemistry and ‡School of Engineering, Brown University , Providence, Rhode Island 02912, United States.
Journal of the American Chemical Society
|October 26, 2013
概括
金纳米粒子有效地将二氧化碳转化为一氧化碳. 优化的8纳米金纳米粒子 (NP) 达到90%的选择性,证明了二氧化碳电催化的一条有前途的途径.
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:
- 电催化减少二氧化碳 (CO2) 对可持续能源至关重要.
- 黄金纳米粒子 (Au NPs) 显示了减少二氧化碳的潜力,但选择性和效率需要改进.
研究的目的:
- 研究金纳米颗粒大小对二氧化碳电催化降解到二氧化碳的影响.
- 阐明Au NP减少二氧化碳的机制,并提高催化性能.
主要方法:
- 在KHCO3电解液中使用单分散金纳米粒子 (4-10nm) 电催化减少CO2.
- 密度函数理论 (DFT) 计算以了解反应机制.
- 在丁-3-甲基利米达六酸中对Au NPs进行固定,以提高性能.
主要成果:
- 8nm Au NPs在 -0.67 V 与 RHE 的 CO 生产中表现出最大的法拉代效率 (FE) 为 90%.
- DFT计算表明,Au NP上的边缘位置更有利于CO演变而不是H2演变.
- 嵌入式Au NPs在-0.52V (vs RHE) 实现了97%的FE和3A/g质量活动,显示出增强的CO2稳定性.
结论:
- 单分散黄金纳米颗粒,特别是8nm,对于电催化二氧化碳降解为二氧化碳具有高度选择性.
- 在Au NP上优化表面位置和中间稳定显著提高了催化活性和选择性.
- 这项工作突出了定制的Au NP在高效的二氧化碳转化方面的潜力.
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