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Solar‐Driven CO 2 Conversion via Optimized Photothermal Catalysis in a Lotus Pod Structure

Journal Article · · Angewandte Chemie
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  1. Department of Chemistry Yale University CT 06520 New Haven USA, Energy Sciences Institute Yale University CT 06516 West Haven USA
  2. Department of Materials Science and Engineering University of Pennsylvania PA 19104 Philadelphia USA
Abstract

Photothermal CO 2 reduction is one of the most promising routes to efficiently utilize solar energy for fuel production at high rates. However, this reaction is currently limited by underdeveloped catalysts with low photothermal conversion efficiency, insufficient exposure of active sites, low active material loading, and high material cost. Herein, we report a potassium‐modified carbon‐supported cobalt (K + −Co−C) catalyst mimicking the structure of a lotus pod that addresses these challenges. As a result of the designed lotus‐pod structure which features an efficient photothermal C substrate with hierarchical pores, an intimate Co/C interface with covalent bonding, and exposed Co catalytic sites with optimized CO binding strength, the K + −Co−C catalyst shows a record‐high photothermal CO 2 hydrogenation rate of 758 mmol g cat −1  h −1 (2871 mmol g Co −1  h −1 ) with a 99.8 % selectivity for CO, three orders of magnitude higher than typical photochemical CO 2 reduction reactions. We further demonstrate with this catalyst effective CO 2 conversion under natural sunlight one hour before sunset during the winter season, putting forward an important step towards practical solar fuel production.

Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0021173
OSTI ID:
1984896
Journal Information:
Angewandte Chemie, Journal Name: Angewandte Chemie Journal Issue: 30 Vol. 135; ISSN 0044-8249
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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