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Compositionally Screened Eutectic Catalytic Coatings on Halide Perovskite Photocathodes for Photoassisted Selective CO2 Reduction
journal contribution
posted on 2019-05-08, 00:00 authored by Jie Chen, Jun Yin, Xiaopeng Zheng, Hassan Ait Ahsaine, Yang Zhou, Chunwei Dong, Omar F. Mohammed, Kazuhiro Takanabe, Osman M. BakrSelective
CO2 reduction via photoelectrocatalysis is
a creative approach to alleviating the energy crisis and environmental
deterioration as well as to producing value-added chemicals. A considerable
challenge is the development of electrocatalysts and photoelectrocatalytic
systems to selectively and efficiently produce a target product. Here,
we report an efficient and selective photocathode for converting CO2 to HCOOH in aqueous solution. A rational compositional screening
strategy was first applied to pinpoint In0.4Bi0.6 from ternary In–Bi–Sn alloys as the most HCOOH-selective
electrocatalyst composition among the electrocatalysts reported. A
photocathode was then fabricated by coating the catalytic, protective,
and conductive In0.4Bi0.6 alloy layer on a halide
perovskite photovoltaic, effectively utilizing its low melting point
eutectic molten state. The generated photovoltage assisted reduction
of the overpotential by 680 mV while producing a stable current for
nearly exclusive HCOOH production under simulated AM 1.5G irradiation.
This work provides a promising approach to achieving efficient and
selective solar–fuel conversion.
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Keywords
photocathodeAM 1.5 G irradiationCO 2 reduction0.4 Bi 0.6HCOOH-selective electrocatalyst compositionCO 2 Reductiontarget productapproachphotoelectrocatalytic systemsscreening strategyHCOOH production680 mVpoint eutecticCO 20.4 Bi 0.6 alloy layerHalide Perovskite Photocathodesenergy crisisCompositionally Screened Eutectic Catalytic Coatingshalide perovskite photovoltaic
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