Journal
CHEMICAL SCIENCE
Volume 8, Issue 4, Pages 2569-2573Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6sc04966d
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Funding
- Ministry of Science and Technology of China [2016YFB0600901, 2013CB933100]
- National Natural Science Foundation of China [21573222, 91545202]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB17020200]
- CAS Youth Innovation Promotion
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Electrochemical promotion of catalysis (EPOC) has been shown to accelerate the rate of many heterogeneous catalytic reactions; however, it has rarely been reported in low-temperature aqueous electrochemical reactions. Herein, we report a significant EPOC effect for the CO2 reduction to generate formate over Pd nanoparticles (NPs) in a 1 M KHCO3 aqueous solution. By applying a negative potential over differently-sized Pd NPs, the rate of formate production is greatly improved as compared to that at an open-circuit voltage, with a rate enhancement ratio ranging from 10 to 143. The thermocatalytic and electrocatalytic reduction of CO2 compete with each other and are promoted by the applied negative potential and H-2 in the feeds, respectively. Inspired by the EPOC effect, a composite electrode containing Pd/C and Pt/C catalysts on different sides of a carbon paper was constructed for catalyzing the CO2 reduction without adding H-2 to the feeds. Water electrolysis over Pt NPs generates H-2, which then effectively promotes formate production over Pd NPs.
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