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Efficient solar-driven electrocatalytic CO2 reduction in a redox-medium-assisted system.


ABSTRACT: Solar-driven electrochemical carbon dioxide (CO2) reduction is capable of producing value-added chemicals and represents a potential route to alleviate carbon footprint in the global environment. However, the ever-changing sunlight illumination presents a substantial impediment of maintaining high electrocatalytic efficiency and stability for practical applications. Inspired by green plant photosynthesis with separate light reaction and (dark) carbon fixation steps, herein, we developed a redox-medium-assisted system that proceeds water oxidation with a nickel-iron hydroxide electrode under light illumination and stores the reduction energy using a zinc/zincate redox, which can be controllably released to spontaneously reduce CO2 into carbon monoxide (CO) with a gold nanocatalyst in dark condition. This redox-medium-assisted system enables a record-high solar-to-CO photoconversion efficiency of 15.6% under 1-sun intensity, and an outstanding electric energy efficiency of 63%. Furthermore, it allows a unique tuning capability of the solar-to-CO efficiency and selectivity by the current density applied during the carbon fixation.

SUBMITTER: Wang Y 

PROVIDER: S-EPMC6258760 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature

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Efficient solar-driven electrocatalytic CO<sub>2</sub> reduction in a redox-medium-assisted system.

Wang Yuhang Y   Liu Junlang J   Wang Yifei Y   Wang Yonggang Y   Zheng Gengfeng G  

Nature communications 20181127 1


Solar-driven electrochemical carbon dioxide (CO<sub>2</sub>) reduction is capable of producing value-added chemicals and represents a potential route to alleviate carbon footprint in the global environment. However, the ever-changing sunlight illumination presents a substantial impediment of maintaining high electrocatalytic efficiency and stability for practical applications. Inspired by green plant photosynthesis with separate light reaction and (dark) carbon fixation steps, herein, we develop  ...[more]

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