Dataset Information

Designing Highly Efficient Cu₂O-CuO Heterojunction CO Oxidation Catalysts: The Roles of the Support Type and Cu₂O-CuO Interface Effect.

ABSTRACT: In this work, a series of Cu₂O/S (S = α-MnO₂, CeO₂, ZSM-5, and Fe₂O₃) supported catalysts with a Cu₂O loading amount of 15% were prepared by the facile liquid-phase reduction deposition-precipitation strategy and investigated as CO oxidation catalysts. It was found that the Cu₂O/α-MnO₂ catalyst exhibits the best catalytic activity for CO oxidation. Additionally, a series of Cu₂O-CuO/α-MnO₂ heterojunctions with varied proportion of Cu⁺/Cu²⁺ were synthesized by further calcining the pristine Cu₂O/α-MnO₂ catalyst. The ratio of the Cu⁺/Cu²⁺ could be facilely regulated by controlling the calcination temperature. It is worth noting that the Cu₂O-CuO/α-MnO₂-260 catalyst displays the best catalytic performance. Moreover, the kinetic studies manifest that the apparent activation energy could be greatly reduced owing to the excellent redox property and the Cu₂O-CuO interface effect. Therefore, the Cu₂O-CuO heterojunction catalysts supported on α-MnO₂ nanotubes are believed to be the potential catalyst candidates for CO oxidation with advanced performance.

SUBMITTER: Zhao F

PROVIDER: S-EPMC9457833 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature

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Designing Highly Efficient Cu2O-CuO Heterojunction CO Oxidation Catalysts: The Roles of the Support Type and Cu2O-CuO Interface Effect.

Zhao Fen F Shi Yiyu Y Xu Leilei L Chen Mindong M Xue Yingying Y Wu Cai-E CE Qiu Jian J Cheng Ge G Xu Jingxin J Hu Xun X

Nanomaterials (Basel, Switzerland) 20220831 17

In this work, a series of Cu2O/S (S = α-MnO2, CeO2, ZSM-5, and Fe2O3) supported catalysts with a Cu2O loading amount of 15% were prepared by the facile liquid-phase reduction deposition-precipitation strategy and investigated as CO oxidation catalysts. It was found that the Cu2O/α-MnO2 catalyst exhibits the best catalytic activity for CO oxidation. Additionally, a series of Cu2O-CuO/α-MnO2</su ...[more]

PMID: 36080056

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Project description:Well designed and optimized epitaxial heterostructures lie at the foundation of materials development for photovoltaic, photocatalytic, and photoelectrochemistry applications. Heterostructure materials offer tunable control over charge separation and transport at the same time preventing recombination of photogenerated excitations at the interface. Thus, it is of paramount importance that a detailed understanding is developed as the basis for further optimization strategies and design. Oxides of copper are nontoxic, low cost, abundant materials with a straightforward and stable manufacturing process. However, in individual applications, they suffer from inefficient charge transport of photogenerated carriers. Hence, in this work, we investigate the role of the interface between epitaxially aligned CuO and Cu2O to explore the potential benefits of such an architecture for more efficient electron and hole transfer. The CuO/Cu2O heterojunction nature, stability, bonding mechanism, interface dipole, electronic structure, and band bending were rationalized using hybrid density functional theory calculations. New electronic states are identified at the interface itself, which are originating neither from lattice mismatch nor strained Cu-O bonds. They form as a result of a change in coordination environment of CuO surface Cu2+ cations and an electron transfer across the interface Cu1+-O bond. The first process creates occupied defect-like electronic states above the valence band, while the second leaves hole states below the conduction band. These are constitutional to the interface and are highly likely to contribute to recombination effects competing with the improved charged separation from the suitable band bending and alignment and thus would limit the expected output photocurrent and photovoltage. Finally, a favorable effect of interstitial oxygen defects has been shown to allow for band gap tunability at the interface but only to the point of the integral geometrical contact limit of the heterostructure itself.

Dataset Information

Designing Highly Efficient Cu₂O-CuO Heterojunction CO Oxidation Catalysts: The Roles of the Support Type and Cu₂O-CuO Interface Effect.

Publications

Designing Highly Efficient Cu<sub>2</sub>O-CuO Heterojunction CO Oxidation Catalysts: The Roles of the Support Type and Cu<sub>2</sub>O-CuO Interface Effect.

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