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Tunable Selectivity and High Efficiency of CO2 Electroreduction via Borate-Enhanced Molten Salt Electrolysis.


ABSTRACT: Converting CO2 into value-added chemical fuels and functional materials by CO2 reduction reaction (CO2RR) is conducive to achieving a carbon-neutral energy cycle. However, it is still challenging to efficiently navigate CO2RR toward desirable products. Herein, we report a facile strategy to extend product species in borate-containing molten electrolyte at a positively shifted cathodic potential with a high current density (e.g. 100 mA/cm2), which can selectively electro-transform CO2 into desired products (either CO or solid carbon nanofibers, respectively reaching a high selectivity of ?90%). The borates can act as a controller of electrolyte alkalinity to buffer the concentration of sequentially generated O2- during CO2RR, positively shifting the reduction potential of the captured CO2 and concurrently extending the product species. The sustainable buffering effect is available under CO2 atmosphere. Compared with borate-free electrolyte, the CO2 conversion efficiency is over three times higher, while the electrolysis energy consumption is decreased by over 40%.

SUBMITTER: Hu L 

PROVIDER: S-EPMC7648164 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature

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Tunable Selectivity and High Efficiency of CO<sub>2</sub> Electroreduction via Borate-Enhanced Molten Salt Electrolysis.

Hu Liangyou L   Deng Bowen B   Du Kaifa K   Jiang Rui R   Dou Yanpeng Y   Wang Dihua D  

iScience 20201007 10


Converting CO<sub>2</sub> into value-added chemical fuels and functional materials by CO<sub>2</sub> reduction reaction (CO<sub>2</sub>RR) is conducive to achieving a carbon-neutral energy cycle. However, it is still challenging to efficiently navigate CO<sub>2</sub>RR toward desirable products. Herein, we report a facile strategy to extend product species in borate-containing molten electrolyte at a positively shifted cathodic potential with a high current density (e.g. 100 mA/cm<sup>2</sup>),  ...[more]

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