S-scheme heterojunction based on p-type ZnMn2O4 and n-type ZnO with improved photocatalytic CO2 reduction activity

Deng, Hongzhao; Fei, Xingang; Yang, Yi; Fan, Jiajie; Yu, Jiaguo; Zhang, Liuyang

doi:10.1016/j.cej.2020.127377

Cited by 309 publications

(111 citation statements)

References 69 publications

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“…Therefore, numerous S‐scheme photocatalysts for CO 2 reduction have been explored, e.g., g‐C 3 N 4 /Cu 3 P|S, g‐C 3 N 4 /Ti 3 C 2 T x Mxene, ZnMn 2 O 4 /ZnO, CdS/TiO 2 , g‐C 3 N 4 /CdSe‐DETA, g‐C 3 N 4 /Bi/BiVO 4 , g‐C 3 N 4 /Bi 12 O 17 C l2 , SnNb 2 O 6 /CdSe, TiO 2 @PDA, and BP/g‐C 3 N 4 . [ 61–71 ] Deng et al constructed hierarchical S‐scheme ZnMn 2 O 4 /ZnO nanofiber photocatalysts with using electrospinning and subsequent calcination. [ 62 ] The S‐scheme heterojunction photocatalysts present more than 4 times increment in CO and CH 4 products than pure ZnO nanofiber photocatalysts.…”

Section: S‐scheme Photocatalystsmentioning

confidence: 99%

“…[ 61–71 ] Deng et al constructed hierarchical S‐scheme ZnMn 2 O 4 /ZnO nanofiber photocatalysts with using electrospinning and subsequent calcination. [ 62 ] The S‐scheme heterojunction photocatalysts present more than 4 times increment in CO and CH 4 products than pure ZnO nanofiber photocatalysts. The strong redox capability, i.e., photogenerated e − with reduction potential of −1.47 V at CB of ZnMn 2 O 4 , and h + with oxidation potential of +2.58 over VB of ZnO, has been ensured to overcome CO 2 reduction overpotential.…”

Section: S‐scheme Photocatalystsmentioning

confidence: 99%

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S‐Scheme Photocatalytic Systems

et al. 2021

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Recently, step‐scheme (S‐scheme) photocatalysts have received widespread attention in the field of solar fuel development and transformation because of efficient charge spatial separation along with strong redox capabilities. Herein, the development history of S‐scheme photocatalysts is summarized and reviewed, from Z‐scheme photocatalysts to S‐scheme photocatalysts. Advantages of S‐scheme photocatalysts are also discussed in depth and detail, including design principles and construction strategies as well as charge transfer mechanisms. In addition, identification characterizations for S‐scheme photocatalysts and their solar energy conversion applications are also reviewed. Finally, conclusions and outlooks for solar energy conversion challenges are demonstrated. It provides insights and up‐to‐date information to enable the scientific community to fully tap into the potential of S‐scheme photocatalysts in renewable energy generation and environmental remediation.

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Section: S‐scheme Photocatalystsmentioning

confidence: 99%

Section: S‐scheme Photocatalystsmentioning

confidence: 99%

S‐Scheme Photocatalytic Systems

et al. 2021

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“…With the development of society, the greenhouse effect has posed a great threat to human life due to excessive CO 2 emission. Numerous solutions have been explored, including electrochemical Liu et al (2016), Albo et al (2017), thermochemical Erb and Zarzycki (2016), Gong et al (2016), and photochemical methods (Deng et al, 2020;Deng et al, 2021;Gogoi et al, 2021;Meng et al, 2021;Zhang et al, 2021b). Among them, photocatalytic methods are promising due to the sustainability of solar light (Chen et al, 2020;Liu et al, 2020;Xu et al, 2020b;Zhen et al, 2020;Liu et al, 2021a;Wei et al, 2021a;Zhang et al, 2021c).…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, exploration of effective photocatalysts is necessary. In the past few years, various photocatalysts have been explored for photocatalytic CO 2 reduction such as metals (Dong et al, 2020), metal sulfides (Suzuki et al, 2018;Ge et al, 2019;Wang et al, 2020;Xu et al, 2020a), metal oxides (Wang et al, 2020;Wang et al, 2021), and nonmetals (He et al, 2020;Fei et al, 2021). Despite the great progress, low visible-light absorption and poor catalytic activity are still common problems faced by these photocatalysts.…”

Section: Introductionmentioning

confidence: 99%

DFT Study on Regulating the Electronic Structure and CO2 Reduction Reaction in BiOBr/Sulphur-Doped G-C3N4 S-Scheme Heterojunctions

Fei

Zhang

et al. 2021

Front. Nanotechnol.

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Photocatalytic CO2 reduction is a promising method to mitigate the greenhouse effect and energy shortage problem. Development of effective photocatalysts is vital in achieving high photocatalytic activity. Herein, the S-scheme heterojunctions composed by BiOBr and g-C3N4 with or without S doping are thoroughly investigated for CO2 reduction by density functional theory (DFT) calculation. Work function and charge density difference demonstrate the existence of a built-in electric field in the system, which contributes to the separation of photogenerated electron-hole pairs. Enhanced strength of a built-in electric field is revealed by analysis of Bader charge and electric field intensity. The results indicate that S doping can tailor the electronic structures and thus improve the photocatalytic activity. According to the change in absorption coefficient, system doping can also endow the heterojunction with increased visible light absorption. The in-depth investigation indicates that the superior CO2 reduction activity is ascribed to low rate-determining energy. And both of the heterojunctions are inclined to generate CH3OH rather than CH4. Furthermore, S doping can further reduce the energy from 1.23 to 0.44 eV, indicating S doping is predicted to be an efficient photocatalyst for reducing CO2 into CH3OH. Therefore, this paper provides a theoretical basis for designing appropriate catalysts through element doping and heterojunction construction.

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“…Traditional heterojunctions (such as type-II heterojunctions, p-n junction) typically produce unfavorable losses of the photogenerated charges, while the Z-scheme heterostructure represent the starting point on the development of S-scheme heterostructure [ 15 , 16 ]. If compared with Z-scheme heterostructure, the S-scheme efficiently use the build-in electric field in order to reduce the migration distance of photogenerated electrons and holes based on the synergetic interface between the semiconductor components [ 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Tuned S-Scheme Cu2S_TiO2_WO3 Heterostructure Photocatalyst toward S-Metolachlor (S-MCh) Herbicide Removal

Eneşca

Isac

2021

Materials

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A dual S-scheme Cu2S_TiO2_WO3 heterostructure was constructed by sol–gel method using a two-step procedure. Due to the synthesis parameters and annealing treatment the heterostructure is characterized by sulfur deficit and oxygen excess allowing the passivation of oxygen vacancies. The photocatalytic activity was evaluated under UV and UV–Vis irradiation scenarios using S-MCh as reference pollutant. The heterostructure is composed on orthorhombic Cu2S, anatase TiO2 and monoclinic WO3 with crystallite sizes varying from 65.2 Å for Cu2S to 97.1 Å for WO3. The heterostructure exhibit a dense morphology with pellets and particle-like morphology closely combined in a relatively compact assembly. The surface elemental composition indicate that the heterostructure maintain a similar atomic ratio as established during the synthesis with a slight sulfur deficit due to the annealing treatments. The results indicate that the three-component heterostructure have higher photocatalytic efficiency (61%) comparing with two-component heterostructure or bare components. Moreover, Cu2S_TiO2_WO3 exhibit a superior constant rate (0.114 s−1) due to the high concentration of photogenerated charge carriers, efficient charge separation and migration.

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S-scheme heterojunction based on p-type ZnMn2O4 and n-type ZnO with improved photocatalytic CO2 reduction activity

Cited by 309 publications

References 69 publications

S‐Scheme Photocatalytic Systems

S‐Scheme Photocatalytic Systems

DFT Study on Regulating the Electronic Structure and CO2 Reduction Reaction in BiOBr/Sulphur-Doped G-C3N4 S-Scheme Heterojunctions

Tuned S-Scheme Cu2S_TiO2_WO3 Heterostructure Photocatalyst toward S-Metolachlor (S-MCh) Herbicide Removal

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