Bio-inspired engineering of BiSPPy composite for the efficient electrocatalytic reduction of carbon dioxide
Using surface-engineered chemical composites to enhance the binding energy of reaction intermediates and the conductivity is an attractive route to achieve a high partial current density and increased yield of the target products. Herein, conductive polymer polypyrrole (PPy) was used to regulate the...
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Published in | Energy & environmental science Vol. 16; no. 9; pp. 3885 - 3898 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Published |
13.09.2023
|
Online Access | Get full text |
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Summary: | Using surface-engineered chemical composites to enhance the binding energy of reaction intermediates and the conductivity is an attractive route to achieve a high partial current density and increased yield of the target products. Herein, conductive polymer polypyrrole (PPy) was used to regulate the electronic structure of Bi
2
S
3
and facilitate the activation of CO
2
molecules to enhance the CO
2
electroreduction activity. The constructed electrocatalyst with a unique 3D hierarchical urchin-like nanoflower morphology was composed of Bi
2
S
3
nanowire assemblies with rich S vacancies
via
PPy modification, featuring an improved electron-transfer ability and outstanding formate faradaic efficiency of 91.18% and partial current density of 56.95 mA cm
2
, as well as good stability at a moderate potential in an H-type cell. More importantly, it could deliver current densities exceeding 300 mA cm
2
without compromising the selectivity of formate in a flow-cell reactor. A possible reaction mechanism for formate formation related to HCO
3
was proposed based on the
in situ
ATR-IR spectra, which could bring a new scientific understanding of CO
2
reduction. DFT calculations further demonstrated that the optimized electronic structure, boosted adsorption and activation of CO
2
, and protonation process contributed to a reduced formation energy for the formate intermediate *OCHO, leading to the enhanced performance. More impressively, ZnCO
2
batteries equipped with Bi
2
S
3
PPy displayed a maximum power density of 2.4 mW cm
2
and a superior cycle stability of >110 h. This study underlines the effectiveness of designing composite electrocatalysts to improve the CO
2
RR performance and thus provides a viable path toward carbon neutrality.
Using surface-engineered chemical composites to enhance the binding energy of reaction intermediates and the conductivity is an attractive route to achieve a high partial current density and increased yield of the target products. |
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Bibliography: | https://doi.org/10.1039/d3ee02029k Electronic supplementary information (ESI) available. See DOI |
ISSN: | 1754-5692 1754-5706 |
DOI: | 10.1039/d3ee02029k |