Aqueous CO2 Reduction at Very Low Overpotential on Oxide-Derived Au Nanoparticles

详细信息    查看全文

• 作者：Yihong Chen ; Christina W. Li ; Matthew W. Kanan
• 刊名：The Journal of the American Chemical Society
• 出版年：2012
• 出版时间：December 12, 2012
• 年：2012
• 卷：134
• 期：49
• 页码：19969-19972
• 全文大小：304K
• 年卷期：v.134,no.49(December 12, 2012)
• ISSN：1520-5126

文摘

Carbon dioxide reduction is an essential component of many prospective technologies for the renewable synthesis of carbon-containing fuels. Known catalysts for this reaction generally suffer from low energetic efficiency, poor product selectivity, and rapid deactivation. We show that the reduction of thick Au oxide films results in the formation of Au nanoparticles (鈥渙xide-derived Au鈥? that exhibit highly selective CO₂ reduction to CO in water at overpotentials as low as 140 mV and retain their activity for at least 8 h. Under identical conditions, polycrystalline Au electrodes and several other nanostructured Au electrodes prepared via alternative methods require at least 200 mV of additional overpotential to attain comparable CO₂ reduction activity and rapidly lose their activity. Electrokinetic studies indicate that the improved catalysis is linked to dramatically increased stabilization of the CO₂^{鈥⑩€?/sup> intermediate on the surfaces of the oxide-derived Au electrodes.}