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Title: Optimizing Materials to Boost the Valorization of CO2: Tuning Cobalt–Cobalt Interactions on In2O3-Based Photothermal Catalysts

Journal Article · · ACS Applied Materials and Interfaces
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [5]
  1. Consejo Superior de Investigaciones Cientificas (CSIC), Madrid (Spain). Inst. de Catalisis y Petroleoquimica; Autonomous Univ. of Madrid (Spain)
  2. Brookhaven National Laboratory (BNL), Upton, NY (United States)
  3. Complutense Univ. of Madrid (Spain); Inst. de Investigacion Sanitaria (ISS), Madrid (Spain)
  4. Brookhaven National Laboratory (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States)
  5. Consejo Superior de Investigaciones Cientificas (CSIC), Madrid (Spain). Inst. de Catalisis y Petroleoquimica

The valorization of CO2 is an important challenge within the current panorama, since this molecule is probably the main contributor to climate change. In this study, the synthesis of materials based on a nanostructured batonnet-type indium oxide is carried out. In them, different amounts of Co are introduced, varying between 2 and 8% mol. It is verified that the most active sample in the transformation of carbon dioxide to carbon monoxide contains 6 mol %. of Co. This sample’s activity under dual excitation exceeds the thermal counterpart by more than 30%. After carrying out a complete physical and chemical characterization with the help of X-ray absorption spectroscopy and other techniques, it is shown that catalysts with amounts of cobalt equal to or below 4 mol % contain isolated single-atom species, while those with higher amounts of metal display a Co–Co interaction which triggers the evolution of the samples under reaction conditions. The optimum control of this Co–Co interaction and the nature of the final cobalt-containing species determine dual photothermal catalytic properties. In conclusion, this work establishes a structure–activity relationship to interpret the catalytic behavior of highly dispersed subnanometric cobalt species, and thus an avenue to optimize the photothermal valorization of carbon dioxide.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
SC0012704
OSTI ID:
2480269
Report Number(s):
BNL--226388-2024-JAAM
Journal Information:
ACS Applied Materials and Interfaces, Journal Name: ACS Applied Materials and Interfaces Journal Issue: 45 Vol. 16; ISSN 1944-8244
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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