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Photovoltaic-electrochemical (PV-EC) systems can not only make full use of solar energy, but also transform CO 2 into organic molecules. However, it is difficult to achieve PV-EC systems since most CO 2 reduction catalysts are potential-dependent. This paper describes the rational design of potential-insensitive disordered Ag, which can achieve more than 90% faradaic efficiency (FE) for CO within a wide voltage range of 1.1 V in an electroreduction CO 2 system. The system shows attractive activity under different photovoltage conditions in a PV-EC system. By employing in situ attenuated total reflection surface-enhanced infrared absorption spectroscopy (ATR-SEIRAS), we address the origin of the volcano peak of FE on Ag nanoclusters to understand the mechanism of the carbon dioxide reduction reaction (CO 2 RR). In addition, we find that the CO 2 RR on disordered Ag nanoparticles is a proton-electron coupling transfer (PECT) reaction mechanism, which may result in high activity in a wide potential range.

Achieving convenient CO2 electroreduction and photovoltage in tandem using potential-insensitive disordered Ag nanoparticles

Achieving convenient CO₂ electroreduction and photovoltage in tandem using potential-insensitive disordered Ag nanoparticles