Journal of Electroanalytical Chemistry and Interfacial Electrochemistry
Effects of electrolytes on the photoelectrochemical reduction of carbon dioxide at illuminated p-type cadmium telluride and p-type indium phosphide electrodes in aqueous solutions
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2018, Catalysis TodayCitation Excerpt :In this mechanistic route, it was proposed that the formation of an intermediate carbon dioxide anion radical (CO2−) by a single electron reduction of carbon dioxide is the initial and the rate-determining step as given by Eq. (3) in Table 1. The initial step is followed by a second electron and a water-mediated proton in CO2− forming HCOO− [27,44–49], while an alternative pathway of this mechanism is the formation of CO in which another electron transfer and a CO2 molecule are involved [44,49,50]. It has been further suggested that in the presence of Cu particles, CO2− can be converted into methane or ethene by several electronation/protonation steps [49].
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2018, Electrochimica ActaCitation Excerpt :In fact, CO2 can be reduced to various products including CO, CH4, methanol, formaldehyde, formic acid, etc., and most of the reduction potential is more negative than that of hydrogen evolution reaction (HER), indicating the fierce competition can happen between them. By far, several p-type semiconductor electrodes have been investigated in PEC reduction of CO2, including GaP [5,6], InP [7], p-Si [8,9], Cu2O [10], ZnTe [11–13], CuNbO3 [14], CuFeO2 [15], etc. However, the selectivity towards CO2 reduction over these photocathodes are low due to the preferential H2 production, which need be improved by cooperating with assistant catalyst such as metal nanoparticles [12], pyridine molecules [16], or other metal complexes [17].
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