A core-satellite structured type II heterojunction photocatalyst with enhanced CO2 reduction under visible light

Cheng, Yuanyuan; Liu, Yixian; Liu, Yunliang; Li, Yaxi; Wu, Ruqiang; Du, Yongchao; Askari, Najmeh; Liu, Naiyun; Qiao, Fen; Sun, Chenghua; Kang, Zhenhui; Li, Haitao

doi:10.1007/s12274-022-4714-7

Cited by 33 publications

(16 citation statements)

References 69 publications

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“…These spectra also reveal that the flat-band potentials of β-Ga 2 O 3 and CoGa 2 O 4 are approximately −1.50 and 1.86 V vs Ag/AgCl (or −1.30 and 2.06 V vs NHE), respectively, from the corresponding x -axis intercepts. Generally, the conduction band (CB) potential for the n-type semiconductor is considered to be more negative than that of flat-band potential by about −0.1 V ( V fb – 0.1 V), and the valence band (VB) potential for the p-type semiconductor is more positive than that of V fb by about 0.1 V ( V fb + 0.1 V) . Also, the potential versus the Ag/AgCl electrode was converted to the NHE scale using E (NHE) = E (Ag/AgCl) + 0.197 V (pH = 7) .…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic Conversion of CO₂ to CO with a p–n Heterojunction Based on Core–Shell β-Ga₂O₃@CoGa₂O₄ Nanorods

Liu,

Li,

Wang

et al. 2024

ACS Appl. Nano Mater.

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Constructing a p−n heterojunction is an efficient strategy to mitigate the charge-carrier recombination in semiconductors, thereby enhancing photocatalytic activity. This study designed and fabricated core− shell structured p−n heterojunction photocatalyst β-Ga 2 O 3 @CoGa 2 O 4 nanorods, using an in situ self-template-etched chemical route. The experimental results revealed that CoGa 2 O 4 nanoparticles could be intimately grown on the surface of β-Ga 2 O 3 nanorods, and the thickness of the CoGa 2 O 4 shells could be easily adjusted by optimizing the Co/Ga ratio. Notably, when employed as a photocatalyst for the conversion of CO 2 with H 2 O, without requiring additional sacrificial reagents, β-Ga 2 O 3 @CoGa 2 O 4 nanorods showed improved photocatalytic activity for CO 2 reduction to CO with a yield of 21.1 μmol g −1 h −1 compared to isolated β-Ga 2 O 3 or CoGa 2 O 4 . The presence of a p−n heterojunction in β-Ga 2 O 3 @ CoGa 2 O 4 nanorods promotes charge-carrier transportation and separation through the internal electric field caused by n-type β-Ga 2 O 3 and p-type CoGa 2 O 4 . Consequently, this results in enhanced photocatalytic CO 2 reduction activity during continuous operation. This study would offer a feasible method for achieving effective photocatalytic CO 2 conversion through the rational design of p−n heterojunctions at the nanoscale. KEYWORDS: p−n heterojunction, β-Ga 2 O 3 @CoGa 2 O 4 , core−shell nanorods, photocatalysis, CO 2 reduction

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Section: Resultsmentioning

confidence: 99%

Photocatalytic Conversion of CO₂ to CO with a p–n Heterojunction Based on Core–Shell β-Ga₂O₃@CoGa₂O₄ Nanorods

Liu,

Li,

Wang

et al. 2024

ACS Appl. Nano Mater.

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“…Research has shown that more electrons in the lower frequency region promote the efficient transfer of photogenerated electrons and holes in type-II heterojunctions, which is the key to determining the performance of photocatalysts. [134] Additionally, regulating surface catalytic sites and further stabilizing the key intermediate *CO are also crucial for type-II heterojunctions to promote methane production. [135] Z-scheme heterojunctions (Figure 7b) exhibit higher redox potentials, where photogenerated electrons transfer from the conduction band of semiconductor B to the valence band of semiconductor A, separating photogenerated electrons and holes between the valence band of semiconductor A and the conduction band of semiconductor B.…”

Section: Photocatalystmentioning

confidence: 99%

“…by the peak at ~639 cm À 1 (Figure 7e), can also infer the formation of heterojunction in Mn 3 O 4 /FeNbO 4 . [134] The conduction band position can be obtained by the Mott-Schottky experiment, as described in the above section. The heterojunction type would be determined by combining the bandgap information from UV-vis results.…”

Section: Photocatalystmentioning

confidence: 99%

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Electrocatalytic and Photocatalytic CO₂ Methanation: From Reaction Fundamentals to Catalyst Developments

Tian,

Xu,

Gao

et al. 2024

ChemCatChem

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Transitioning from fossil fuels to renewable energy sources is demanded due to the gradual depletion of petroleum oil/gas and the environmental impact of carbon dioxide (CO2) emissions into the atmosphere. Electrocatalytic and photocatalytic CO2 reduction to methane (CH4) using renewable energy sources is crucial for sustainable chemical/fuel production and greenhouse gas reduction. In recent years, extensive research has focused on understanding the fundamental aspects of the two approaches, such as reaction mechanisms and active sites, and exploring/designing novel catalytic materials. This review initially discusses the reaction fundamentals, including performance evaluation indexes, reactors, and mechanisms, to understand the catalytic reactions. Subsequently, various catalyst preparation strategies and characterization methods are summarized, trying to outline the catalyst design principle based on the obtained understanding of the reaction mechanisms. Finally, research challenges and perspectives for future development in this area are discussed and presented. It is expected to provide a comprehensive understanding of the photo/electrocatalytic CO2 methanation, valuable knowledge to novice researchers, and a helpful reference for future research endeavors.

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“…Recently, electrochemical nitrogen reduction reaction (eNRR) has attracted great attention as a promising strategy for synthetic ammonia because electricity-driven reactions aided by catalysts can progress under mild conditions, improving energy efficiency. 3,[11][12][13][14][15] Undoubtedly, the high bond energy of nitrogen and competing hydrogen evolution reaction (HER) impose harsh demand on the capacity of catalysts. 16 Inspired by nitrogen fixing enzymes containing Mo and Fe, 17 the twodimensional (2D) molybdenum disulfide (MoS 2 ) has been widely studied in NRR.…”

Section: Introductionmentioning

confidence: 99%

Interface engineering of CoS/MoS₂ heterostructure for the electrocatalytic reduction of N₂ to NH₃

Liu¹,

Wu²,

Liu³

et al. 2023

Inorg. Chem. Front.

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A core-satellite structured type II heterojunction photocatalyst with enhanced CO2 reduction under visible light

Cited by 33 publications

References 69 publications

Photocatalytic Conversion of CO₂ to CO with a p–n Heterojunction Based on Core–Shell β-Ga₂O₃@CoGa₂O₄ Nanorods

Photocatalytic Conversion of CO₂ to CO with a p–n Heterojunction Based on Core–Shell β-Ga₂O₃@CoGa₂O₄ Nanorods

Electrocatalytic and Photocatalytic CO₂ Methanation: From Reaction Fundamentals to Catalyst Developments

Interface engineering of CoS/MoS₂ heterostructure for the electrocatalytic reduction of N₂ to NH₃

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A core-satellite structured type II heterojunction photocatalyst with enhanced CO2 reduction under visible light

Cited by 33 publications

References 69 publications

Photocatalytic Conversion of CO2 to CO with a p–n Heterojunction Based on Core–Shell β-Ga2O3@CoGa2O4 Nanorods

Photocatalytic Conversion of CO2 to CO with a p–n Heterojunction Based on Core–Shell β-Ga2O3@CoGa2O4 Nanorods

Electrocatalytic and Photocatalytic CO2 Methanation: From Reaction Fundamentals to Catalyst Developments

Interface engineering of CoS/MoS2 heterostructure for the electrocatalytic reduction of N2 to NH3

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Photocatalytic Conversion of CO₂ to CO with a p–n Heterojunction Based on Core–Shell β-Ga₂O₃@CoGa₂O₄ Nanorods

Photocatalytic Conversion of CO₂ to CO with a p–n Heterojunction Based on Core–Shell β-Ga₂O₃@CoGa₂O₄ Nanorods

Electrocatalytic and Photocatalytic CO₂ Methanation: From Reaction Fundamentals to Catalyst Developments

Interface engineering of CoS/MoS₂ heterostructure for the electrocatalytic reduction of N₂ to NH₃