JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Sheng Zhao,Jing Xu,Min Mao,Lingjiao Li,Xuanhao Li
A dye-sensitive photocatalytic H 2 evolution reaction (HER) system with photogenerated carrier directed conduction was constructed. The protonated g-C 3 N 4 combines with the sheet-like Co MOF to form a 2D/2D heterojunction via electrostatic self-assembly. The protonated g-C 3 N 4 and 2D Co-MOF directionally adsorb Eosin Y (EY) and triethanolamine (TEOA) molecules through hydrogen bond and complexation to achieve a whole photocatalytic system. The integral structure effectively facilitates the utilization of dye sensitizer and hole sacrificial agent to achieve the effective and stable photocatalytic H 2 evolution capacity. The photocatalytic hydrogen evolution rate of g-C 3 N 4 after protonation is 1.88 times as high as that of the original g-C 3 N 4 . On the basis of 2D/2D heterojunction, Co MOF is doped with rare earth element Sm. The 4f electrons and the difference valences (Sm 3+ and Co 2+ ) further suppress the reorganization of photogenerated excitons to achieve highly efficient photocatalytic HER. The directional coupling of sensitizer and electron sacrificial agent combined with rare earth element doping makes the photocatalytic HER rate of the composite material reached 73.42 μmol . h −1 within 5 h under simulated sunlight.
研究领域:
材料科学
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光化学
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能源科学
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DOI
高影响因子
JOURNAL OF POWER SOURCES
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2025
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IF 7.9
Changqing Liu,Yufei Chen,Tao Wang,Ying Wang,Conghui Liu,Xingang Kong,Jianfeng Huang,Ling Guo,Lixiong Yin
To tackle the pressing dual challenges of the energy crisis and environmental pollution , it is urgent to develop low-cost, high-activity photocatalysts for solar-driven hydrogen production. In this work, a Zn x Cd 1-x S/protonated g-C 3 N 4 S-scheme heterojunction photocatalyst is successfully constructed using an electrostatic interaction-driven assembly strategy. The optimized composite photocatalyst exhibits a hydrogen evolution rate of 17.64 mmol g −1 h −1 , which is approximately 4.14 times and 28.45 times higher than that of pure Zn x Cd 1-x S and protonated g-C 3 N 4 . The apparent quantum efficiency (AQE) of ZCSCN-20 reaches 12.3 % at 420 nm. The electrostatic interaction drives the assembly of the heterojunction, leading to an intimate interfacial contact. This close connection, in turn, significantly shortens the migration distance and transfer time of photogenerated charges. The established S-scheme charge transfer pathway enables the efficient separation of photogenerated charge carriers while preserving the strong redox capability inherent in the constituent semiconductors. Furthermore, the use of sacrificial agents to deplete photogenerated holes further suppresses charge carrier recombination, synergistically enhancing the overall catalytic activity. This work provides an efficient strategy for preparing and optimizing sulfide-based S-scheme heterojunction photocatalysts, laying a foundation for developing stable, high-performance solar-driven hydrogen production systems.
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产品关联
DOI
高影响因子
MATERIALS TECHNOLOGY
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2021
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IF 3.846
Yusong Pan,Minyuan Yin,Hongjun Fang,Linfeng Xu,Hanxian Yan,Chengling Pan
Protonated g-C3N4/MoS2 heterojunction with enhanced photocatalytic activity was prepared by treating g-C3N4/MoS2 with formic acid and using a hydrothermal method. The microstructure and morphology of the heterojunctions were analysed by XRD, FTIR, SEM, TEM, and XPS technology, respectively. The photodegradation experiment results verified that the formic acid treatment has a positive effect on the photocatalytic performance of g-C3N4/MoS2 heterojunctions. The as-prepared protonated g-C3N4/MoS2 composite with 5 wt% of MoS2 exhibited the highest photodegradation rate and photodegradation kinetic constant (k) for degradation of methyl orange (MO) dye. The activated species trapping experiment revealed that the superoxide radical (·O2−) plays an important role for degradation of MO dye. Furthermore, the investigation on the photocatalytic mechanism inferred that the enhanced photocatalytic property of protonated g-C3N4/MoS2 composite could be attributed to the Z-scheme electron migration mechanism in composite and the improved photo-induced electron-hole separation.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Han Zhang,Xuefeng Bai
Photocatalytic H 2 O 2 production is an eco-friendly technique because only H 2 O, molecular O 2 and light are involved. However, it still confronts the challenges of the unsatisfactory productivity of H 2 O 2 and the dependence on organic electron donors or high purity O 2 , which restrict the practical application. Herein, we construct a type-II heterojunction of the protonated g-C 3 N 4 coated Co 9 S 8 semiconductor for photocatalytic H 2 O 2 production. The ultrathin g-C 3 N 4 uniformly spreads on the surface of the dispersed Co 9 S 8 nanosheets by a two-step method of protonation and dip-coating, and exhibits improved photogenerated electrons transportability and e - -h + pairs separation ability. The photocatalytic system can achieve a considerable productivity of H 2 O 2 to 2.17 mM for 5 h in alkaline medium in the absence of the organic electron donors and pure O 2 . The optimal photocatalyst also obtains the highest apparent quantum yield (AQY) of 18.10% under 450 nm of light irradiation, as well as a good reusability. The contribution of the type-II heterojunction is that the migrations of electrons and holes within the interface between g-C 3 N 4 and Co 9 S 8 matrix promote the separation of photocarriers, and another channel is also opened for H 2 O 2 generation. The accumulated electrons in conduction band (CB) of Co 9 S 8 contribute to the major channel of two-electron reduction of O 2 for H 2 O 2 production. Meanwhile, the electrons in CB of g-C 3 N 4 participate in the single electron reduction of O 2 as an auxiliary channel to enhance the H 2 O 2 production.
研究领域:
材料科学
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环境科学
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化学
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Yu Wang,Yuxin He,Yujing Chi,Peiji Yin,Lishan Wei,Wenwen Liu,Xinyao Wang,Han Zhang,Haiyan Song
Photocatalytic H 2 O 2 production is a green and sustainable technology, which still exposes the issues of excessive dependence on organic electron donors and pure O 2 , and lacking effective use. It is necessary to develop more efficient and more economical photocatalysis system for H 2 O 2 production. Here, we construct a S-scheme p-n heterojunction from the p-type MnS and the n-type protonated g-C 3 N 4 (PCN) semiconductors for photocatalytic H 2 O 2 production and achieve the in situ use of H 2 O 2 for oxidative degradation of oxytetracycline (OTC). The PCN/MnS composite synthesized by a one-step method well maintains a nanosphere structure of α-MnS and load the PCN on the sphere surface to form a heterojunction with strong interaction. PCN/MnS exhibits the improved photogenerated charge separation and electron transfer efficiency. An optimal photocatalyst can produce 669.6 μM of H 2 O 2 for 6 h without using the electron donors and the pure O 2 gas. The mechanism proposed the contribution of a S-scheme p-n heterojunction forms between PCN and MnS. The electrons in conduction band (CB) of MnS are responsible for the major single-electron reduction of •O 2 - radicals and the auxiliary two-electron reduction of O 2 for H 2 O 2 production, while the holes in valence band (VB) of PCN further promote the separation of photocarriers. The photogenerated H 2 O 2 can be effectively used as an in-situ oxidant to achieve 82.2% degradation of OTC in water within 80 min. The •O 2 - radicals which originate from the in situ decomposition of H 2 O 2 over PCN/MnS mainly contribute to the OTC oxidation .
研究领域:
材料科学
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环境科学
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光化学
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催化
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2023
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IF 16.5
Lijuan Sun,Weikang Wang,Ping Lu,Qinqin Liu,Lele Wang,Hua Tang
Catalysts play a vital role in photocatalytic water-splitting by converting solar energy into storable chemical energy. In this study, we successfully synthesized an HCN/HEA heterostructure by rationally combining the Pt 18 Ni 26 Fe 15 Co 14 Cu 27 nano-high-entropy alloy (HEA) as an effective cocatalyst with protonated g-C 3 N 4 (HCN) nanosheets , via an electrostatic self-assembly method. The resulting HCN/HEA exhibited remarkable performance in both photocatalytic H 2 production and selective oxidation of benzyl alcohol to benzaldehyde. The integration of HEA into HCN leads to the formation of Schottky junctions, which can significantly accelerate charge migration and reduce the recombination of charge carriers. Further investigations using in situ surface photovoltage imaging demonstrated that the reducing cocatalyst HEA can act as a photogenerated electron trap. The best HCN/HEA heterojunction exhibited excellent photocatalytic hydrogen production activity, reaching 2.4 mmol g −1 h −1 and an impressive benzaldehyde production rate of 5.44 mmol g −1 h −1 . These values were 958 and 6.6 times higher than those achieved with pristine HCN, respectively. This study offers promise for the rational design of high-performance cocatalysts to improve the transport, separation, and utilization of light-release charge carriers.
研究领域:
材料科学
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化学工程
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光化学
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催化
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产品关联
DOI
高影响因子
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