Unassisted photoelectrochemical CO2 reduction by employing III–V photoelectrode with 15% solar-to-fuel efficiency

IF 19.5 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon Energy Pub Date : 2025-01-06 DOI:10.1002/cey2.669

Karthik Peramaiah, Purushothaman Varadhan, Vinoth Ramalingam, Bilawal Khan, Pradip Kumar Das, Hao Huang, Hui-Chun Fu, Xiulin Yang, Vincent Tung, Kuo-Wei Huang, Jr-Hau He

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Abstract

Solar-driven carbon dioxide reduction reaction (CO₂RR) provides an opportunity to produce value-added chemical feedstocks and fuels. However, achieving efficient and stable photoelectrochemical (PEC) CO₂RR 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 CO₂RR 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 CO₂RR. 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 CO₂RR.

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采用III-V光电极的无辅助光电化学CO2减排，太阳能-燃料效率为15%

太阳能驱动的二氧化碳还原反应（CO2RR）为生产高附加值的化学原料和燃料提供了机会。然而，实现高效和稳定的光电化学（PEC） CO2RR选择性产品是具有挑战性的，因为与PEC设备的光学和电学结构以及电催化剂性质相关的困难。在此，我们构建了一个高效的，集中的阳光驱动的CO2RR装置，由InGaP/GaAs/Ge三结电池作为光阳极和氧化物衍生的Au （Ox-Au）作为阴极组成，以执行无辅助的PEC CO2RR。在单太阳照射下，最大工作电流密度为11.5 mA cm-2，对于一氧化碳（CO）的产生具有令人印象深刻的~98%的法拉第效率（FE），从而使太阳能到燃料的转换效率达到~15%。在10个太阳的集中强度下，光阳极的最大电流密度为~124 mA cm-2，并保持了~60%的FE用于CO生产。结果表明，在使用III-V基光阳极用于高浓度PEC CO2RR方面取得了重大进展。

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来源期刊

Carbon Energy Multiple-

CiteScore

25.70

自引率

10.70%

发文量

116

审稿时长

4 weeks

期刊介绍： Carbon Energy is an international journal that focuses on cutting-edge energy technology involving carbon utilization and carbon emission control. It provides a platform for researchers to communicate their findings and critical opinions and aims to bring together the communities of advanced material and energy. The journal covers a broad range of energy technologies, including energy storage, photocatalysis, electrocatalysis, photoelectrocatalysis, and thermocatalysis. It covers all forms of energy, from conventional electric and thermal energy to those that catalyze chemical and biological transformations. Additionally, Carbon Energy promotes new technologies for controlling carbon emissions and the green production of carbon materials. The journal welcomes innovative interdisciplinary research with wide impact. It is indexed in various databases, including Advanced Technologies & Aerospace Collection/Database, Biological Science Collection/Database, CAS, DOAJ, Environmental Science Collection/Database, Web of Science and Technology Collection.