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Pt-Anchored CuCrO2 for Low-Temperature-Operating High-Performance H2S Chemiresistors
Ruofan Zhang1,2,3, Zanhong Deng2,3, Lei Shi4
1School of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei 230026, China.
ACS Applied Materials & Interfaces
|May 20, 2022
Summary
This study introduces a novel single-atom platinum catalyst on copper chromite (CCO) for highly sensitive and selective hydrogen sulfide (H2S) detection at low temperatures. The catalyst demonstrates exceptional performance due to the spillover effect of platinum single atoms.
Area of Science:
- Materials Science
- Nanotechnology
- Catalysis
Background:
- Single atoms (SAs) on metal oxides offer high efficiency and unique reactivity.
- Developing advanced catalysts for gas sensing is crucial.
Purpose of the Study:
- To design and synthesize isolated platinum single atoms (Pt SAs) anchored on copper chromite (CuCr2O4) nanostructures.
- To investigate the H2S sensing performance and selectivity of the Pt-SA/CCO catalyst.
Main Methods:
- Glycine-nitrate solution combustion synthesis (SCS) route for catalyst preparation.
- Fabrication of chemiresistor devices for gas sensing.
- Ex situ characterizations to understand the sensing mechanism.
Main Results:
- Achieved a high density of isolated Pt SAs (∼100 μm-2) on CCO.
- Demonstrated a significantly boosted H2S response (1250 at 10 ppm H2S, 35x higher than pure CCO) at 100 °C.
- Exhibited excellent selectivity, with minimal response to other tested vapors.
Conclusions:
- The Pt-SA/CCO catalyst shows superior H2S sensing performance.
- The spillover catalytic effect of Pt SA sites is identified as the dominant sensing mechanism.
