Peramaiah K, Varadhan P, Ramalingam V, et al. Unassisted photoelectrochemical CO2 reduction by employing III–V photoelectrode with 15% solar‐to‐fuel efficiency. Carbon Energy. 2025;7:e669
Abstract:
Abstract
Solar‐driven carbon dioxide reduction reaction (CO
2
RR) provides an opportunity to produce value‐added chemical feedstocks and fuels. However, achieving efficient and stable photoelectrochemical (PEC) CO
2
RR into selective products is challenging owing to the difficulties associated with the optical and the electrical configuration of PEC devices and electrocatalyst properties. Herein, we construct an efficient, concentrated sunlight‐driven CO
2
RR setup consisting of InGaP/GaAs/Ge triple‐junction cell as a photoanode and oxide‐derived Au (Ox‐Au) as a cathode to perform the unassisted PEC CO
2
RR. Under one‐sun illumination, a maximum operating current density of 11.5 mA cm
–2
with an impressive Faradaic efficiency (FE) of ~98% is achieved for carbon monoxide (CO) production, leading to a solar‐to‐fuel conversion efficiency of ~15%. Under concentrated intensity of 10 sun, the photoanode records a maximum current density of ~124 mA cm
–2
and maintains ~60% of FE for CO production. The results demonstrate crucial advancements in using III–V based photoanodes for concentrated PEC CO
2
RR.
License type:
Publisher Copyright
Funding Info:
This research / project is supported by the Agency for Science, Technology and Research - CSF
Grant Reference no. : C230415018 and C231218003
This work is supported by the City University of Hong Kong
(9380107 and 7005943), King Abdullah University of Science
and Technology
Description:
This is the peer reviewed version of the following article: Peramaiah K, Varadhan P, Ramalingam V, et al. Unassisted photoelectrochemical CO2 reduction by employing III–V photoelectrode with 15% solar‐to‐fuel efficiency. Carbon Energy. 2025;7:e669, which has been published in final form at https://doi.org/10.1002/cey2.669. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.