The utilization of solar energy into electrochemical reduction systems has received con-siderable attention. Most of these attempts have been conducted in a single electrolyte without a membrane. Here, we report the system combined by the electrochemical CO2 reduction on the Au dendrite electrode and the water oxidation on the Co‐Pi electrode with a Nafion membrane. An efficient reduction of CO2 to CO in the cathode using the proton from water oxidation in the anode is conducted using perovskite solar cells under 1 sun condition. The sustainable reaction condition is secured by balancing each reaction rate based on products analysis. Through this system, we col-lect reduction products such as CO and H2 and oxidation product, O2, separately. Employing separation of each electrode system and series‐connected perovskite solar cells, we achieve 8% of solar to fuel efficiency with 85% of CO selectivity under 1 sun illumination.
Bibliographical noteFunding Information:
Funding: This research was supported by a grant from the Korea Research Institute of Chemical Technology (KRICT)(SS2122‐20).
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.
- CO reduction
- Solar to fuel
- Water oxidation
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Fuel Technology
- Energy Engineering and Power Technology
- Energy (miscellaneous)
- Control and Optimization
- Electrical and Electronic Engineering