MOLECULES
·
2023
·Vol. 28
·期 6
·2508
·
IF 4.6
Hong Qiu,Xiaohui Ma,Hongxia Fan,Yueyan Fan,Yajie Li,Hualei Zhou,Wenjun Li
Molybdenum-based cocatalyst being used to construct heterojunctions for efficient photocatalytic H2production is a promising research hotspot. In this work, CdIn2S4was successfully closely supported on bulk Mo2C via the hydrothermal method. Based on their matching band structures, they formed a Type Ⅰ heterojunction after the combination of Mo2C (1.1 eV, −0.27 V, 0.83 V) and CdIn2S4(2.3 eV, −0.74 V, 1.56 V). A series of characterizations proved that the heterojunction composite had higher charge separation efficiency compared to a single compound. Meanwhile, Mo2C in heterojunction could act as an active site for hydrogen production. The photocatalytic H2production activity of the heterojunction composites was significantly improved, and the maximum activity was up to 1178.32 μmmol h−1g−1for 5Mo2C/CdIn2S4composites. 5Mo2C/CdIn2S4heterojunction composites possess excellent durability in three cycles (loss of 6%). Additionally, the mechanism of increased activity for composites was also investigated. This study provides a guide to designing noble-metal-free photocatalyst for highly efficient photocatalytic H2evolution.Keywords:noble-metal-free;Mo2C;CdIn2S4;heterojunction;carrier separation
研究领域:
材料科学
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催化化学
✓ 已验证
DOI
PubMed
高影响因子
Catalysts
·
2025
·Vol. 15
·期 5
·460
·
IF 4
Yameng Wang,Ao Xu,Jihui Lang,Bin Zuo,Zihan Yu,Keyu Cui,Xuefei Li,Kewei Zhang,Xin Li,Maobin Wei,Jian Cao
CO2photoreduction technology offers significant potential for addressing energy and environmental challenges, though its practical application is hindered by insufficient photo-absorption and rapid carrier recombination. Herein, we constructed the WO3/In2S3S-scheme heterojunction through hydrothermal assembly of two-dimensional WO3nanosheets and scale-like In2S3nanoflakes. Systematic characterization via XRD, XPS, SEM, and TEM verified the successful preparation of hierarchical nanostructures with optimized interfacial contact in the WO3/In2S3composites. UV-Vis DRS analysis showed that the photo-absorption range of the catalyst was significantly widened. Photoelectrochemical investigations (EIS, TPR, PL, and LSV) revealed enhanced carrier separation efficiency and reduced recombination kinetics in the heterojunction system. The optimized WO3/In2S3(WI-60) catalyst had a CO evolution efficiency of 55.14 μmol·g−1under the UV-Vis light, representing a 3.9-fold enhancement over the pure In2S3(14.08 μmol·g−1). Mechanistic studies through the XPS and band-structure analysis confirmed the establishment of an S-scheme carrier’ transfer pathway, which simultaneously preserved strong redox potentials and promoted the separation process of carriers. This research provides a validated strategy for developing efficient S-scheme photocatalytic systems for solar fuel generation.
研究领域:
材料科学
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环境科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Shenyan Zhou,Lianqing Yu,Qianlong Yang,Chong Liu,Wenjing Xie,Kehui Xue,Zhe Li,Yaping Zhang,Haifeng Zhu
The production of hydrogen via the photolysis of water represents a sustainable and environmentally benign approach to energy generation, which has the potential to mitigate energy shortages and environmental degradation. Nonetheless, the efficiency of photocatalysts is significantly limited by the effectiveness of charge carrier separation. Reducing the diffusion distance of these carriers can enhance their overall performance of the photocatalyst. In this context, a composite photocatalyst comprising CuNi 2 S 4 and ZnCdS was synthesized through one-step hydrothermal process. This bulk-phase heterojunction increases the nano-contact areas while maintaining an interface distance that is smaller than the diffusion distance of the carriers. Consequently, the optimal hydrogen production rate achieved was 33.87 mmol/g h, which is an order of magnitude greater than that of pure ZnCdS at 3.35 mmol/g h. Furthermore, the quantum efficiency at 400 nm reached 16 %. The photocurrent of the ZCS-CNS-3 % sample was 57.1 μA/cm², 4.35-fold of pure ZnCdS at 13.1 μA/cm². The incorporation of CuNi 2 S 4 significantly reduces the overpotential required for hydrogen evolution, while concurrently reducing the carrier transfer resistance by an order of magnitude. This bulk-phase structure not only broadens the prospects for the advancement of green and clean energy solutions but also enhances the methodologies for synthesizing nano-contact photocatalysts.
研究领域:
材料科学
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能源研究
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环境科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Jialong Wang,Longbin Chen,Yaodong Yang,Tiancheng Hou,Wei-Feng Rao
Piezoelectric catalytic seawater hydrogen production is one of the most crucial and potential hydrogen production strategies. However, the low surface activity and the high carrier recombination rate limit the further improvement of catalytic efficiency. To solve this problem, we prepared SrBi 4 Ti 4 O 15 (SBTO) and FeS 2 (FS) heterojunctions, which can effectively utilize the valence state transformation cycle between Fe 2+ and Fe 3+ to improve the surface activity and maintain carrier separation. This mechanism of Fe 2+ and Fe 3+ conversion is similar to the well-known Fenton reaction. It was confirmed by electrochemical measurements that with the help of FeS 2 , SBTO possessed a stronger piezoelectric current response and faster carrier transfer rate. Piezoelectric catalytic seawater splitting H 2 evolution rate of SBTO-25 %FeS 2 could reach 31 mmol g -1 h −1 , which is higher than that of other piezoelectric materials in similar conditions. Our findings provide valuable insights for further improving the efficiency of seawater hydrogen production efficiency.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Rui Li,Shuangjun Li,Luyang Zuo,Xiangping Xiao,Huitao Fan,Bo Li,Liya Wang
The spatial segmentation of photogenerated carriers is crucial for achieving efficient photocatalytic H 2 production (PHP) rates in photocatalyst. Design studies of crystalline catalyst facets and selective morphology control can facilitate the development of catalysts that expose more advantageous active facets. Herein, Cu 2 WS 4 /ZnIn 2 S 4 composites are constructed by growing ZnIn 2 S 4 nanosheets in situ on Cu 2 WS 4 with largely exposed {0 0 1} surface. Experiments and density functional theory calculations demonstrate that the electrons of ZnIn 2 S 4 flowed to the {0 0 1} surface of Cu 2 WS 4 , and the holes vectorially migrated to the {1 0 1} surface, during the reaction process, resulting in efficient spatial separation of the photogenerated carriers. The Cu 2 WS 4 /ZnIn 2 S 4 achieves a PHP rate of 23.67 mmol g −1 h −1 , 13.44-fold increase compared with pure ZnIn 2 S 4 . This report combines the advantages of the high-energy activity of the Cu 2 WS 4 {0 0 1} surface to morphologically control the ratio of the {0 0 1}/{1 0 1} surfaces so that ZnIn 2 S 4 can contact a larger area of the {0 0 1} surface. Furthermore, under the influence of crystallographic effects on the {0 0 1} and {1 0 1} surfaces, electrons and holes of ZnIn 2 S 4 are transferred to different crystalline facets, promoting the redox reaction. This paper provides effective ideas for the rational design of photocatalysts with efficient carrier space separation.
研究领域:
材料科学
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催化化学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2023
·Vol. 34
·期 40
·405201
·
IF 3.5
Zhuohua Chen,Xiaoli Jin,Qing Lan,Xin Li,Qunzeng Huang,Wenmin Liu,Yuwei Guo,Haiquan Xie,Liqun Ye
Photocatalytic CO2 reduction is considered to be an appealing way of alleviating environmental pollution and energy shortages simultaneously under mild condition. However, the activity is greatly limited by the poor separation of the photogenerated carriers. Ion doping is a feasible strategy to facilitate the charge transfer. In this work, Ni-doped Bi4O5I2 photocatalyst is successfully fabricated using a one-pot hydrothermal method. A few doping levels appear in the energy band of Bi4O5I2 after Ni doping, which are used as springboards for electrons transition, thus promoting photoexcited electrons and holes separation. As a consequence, a remarkably enhanced yield of CO and CH4 (6.2 and 1.9 μmol g−1 h−1) is obtained over the optimized Bi4O5I2-Ni15, which is approximately 2.1 and 3.8 times superior to pure Bi4O5I2, respectively. This work may serve as a model for the subsequent research of Bi-based photocatalysts to implement high-performance CO2 photoreduction.
研究领域:
材料科学
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环境科学
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能源科学
✓ 已验证
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 10
·3879
·
IF 3.4
Yelin Dai,Ziyi Feng,Kang Zhong,Jianfeng Tian,Guanyu Wu,Qing Liu,Zhaolong Wang,Yingjie Hua,Jinyuan Liu,Hui Xu,Xingwang Zhu
Water pollution is a significant social issue that endangers human health. The technology for the photocatalytic degradation of organic pollutants in water can directly utilize solar energy and has a promising future. A novel Co3O4/g-C3N4type-II heterojunction material was prepared by hydrothermal and calcination strategies and used for the economical photocatalytic degradation of rhodamine B (RhB) in water. Benefitting the development of type-II heterojunction structure, the separation and transfer of photogenerated electrons and holes in 5% Co3O4/g-C3N4photocatalyst was accelerated, leading to a degradation rate 5.8 times higher than that of pure g-C3N4. The radical capturing experiments and ESR spectra indicated that the main active species are •O2−and h+. This work will provide possible routes for exploring catalysts with potential for photocatalytic applications.Keywords:photocatalyst;type-II heterojunction;carrier separation;photodegradation
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Guoan Lin,Xiaoqin Sun,Xiaoxiang Xu
LaTiO 2 N is modified by Mg doping to construct solid solution series, i.e ., LaTi 1−x Mg x O 2+y N 1−y (0 ≤ x ≤ 0.5). This modification effectively decreases the defect concentration (particularly bulk Ti 3+ species and anion vacancies), increases the surface hydrophilicity, positively shifts the valence band top albeit it also enlarges the bandgap and induces Ti/Mg ordering when x ≥ 0.2. These competitive tensions render an optimal composition at LaTi 0.9 Mg 0.1 O 2+y N 1−y (x = 0.1) where both a low defect concentration and a disordered state of Ti/Mg can be reached, demonstrating much-improved photocarrier separation and exceptional photocatalytic activity with apparent quantum efficiency as high as 13.02 % at 420 ± 20 nm for O 2 -evolution. Overall water splitting (H 2 /O 2 molar ratio = 2/1) with good recycling stability has been realized by integrating LaTi 0.9 Mg 0.1 O 2+y N 1−y into a Z-scheme system. These findings justify the efficacy of Mg as a useful modulator to improve the photocatalytic performance of metal oxynitrides.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTAL RESEARCH AND TECHNOLOGY
·
2021
·Vol. 56
·期 7
·2000240
·
IF 1.639
Jia Zhang,Zhen Wang,Lu Liu,Baorong Hu,Yilei Zhao,Shuang Zhao,Wenting Zhao,Shuang Li,Xi Chen,Xin Hai
Semiconductor photocatalysis is considered a promising technology for destroying pollutants, while the faint carrier separation efficiency of the photocatalyst is one of the main limitations for obtaining high performance. This study reports a solid solution strategy to achieve effective carrier separation in Bi 4 O 5 Br x I 2− x . The solid solution structure endows Bi 4 O 5 Br x I 2− x with proper light adsorption, tunable band gap, and effective separation of photogenerated electrons and holes. As a result, Bi 4 O 5 Br x I 2− x exhibits reduction and oxidation activities for highly efficient photocatalytic Cr(VI) reduction and tetracycline hydrochloride (HTC) degradation under visible light irradiation, with the activity reaching the maximum at x = 1. Within 30 min, the removal rates of Cr(VI) and HTC reach 90% and 100%, respectively. This study not only provides an effective strategy to increase the carrier separation of bismuth-based semiconductors, but also opens new opportunities to rationally design other solid solution catalysts with high performance in wastewater treatment.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Chemical Science
·
2023
·Vol. 15
·期 3
·896-905
·
IF 8.4
Xiaodong Wang,Huijuan Zhang,Chuanzhen Feng,Yu Wang
Efficient carrier separation is important for improving photoelectrochemical water splitting. Here, the morphology modification and band structure engineering of Ta3N5 are accomplished by doping it with Cu and Zr using a two-step method for the first time. The initially interstitially-doped Cu atoms act as anchors to interact with subsequently doped Zr atoms under the influence of differences in electronegativity. This interaction results in Cu,Zrg–Ta3N5 having a dense morphology and higher crystallinity, which helps to reduce carrier recombination at grain boundaries. Furthermore, the gradient doping of Zr generates a band edge energy gradient, which significantly enhances bulk charge separation efficiency. Therefore, a photoanode based on Cu,Zrg–Ta3N5 delivers an onset potential of 0.38 VRHE and a photocurrent density of 8.9 mA cm−2 at 1.23 VRHE. Among all the Ta3N5-based photoanodes deposited on FTO, a Cu,Zrg–Ta3N5-based photoanode has the lowest onset potential and highest photocurrent. The novel material morphology regulation and band edge position engineering strategies described herein provide new ideas for the preparation of other semiconductor nanoparticles to improve the photoelectrochemical water splitting performance.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 33
·19169-19177
·
IF 3.119
Biao Zhou,Bo Yang,Muhammad Waqas,Ke Xiao,Caizhen Zhu,Ling Wu
Constructing a 0D/3D p–n heterojunction is a feasible strategy for accelerating photo-induced charge separation and promoting photocatalytic H2 production. In this study, a 0D/3D MoS2/g-C3N4 (0D/3D-MCN) photocatalyst with a p–n heterojunction was prepared via a facile light-assisted deposition procedure, and the 3D spongy-like g-C3N4 (3D-CN) was synthesized through simple thermolysis of NH4Cl and melamine mixture. For comparison, 2D-MoS2 nanosheets were also embedded in 3D-CN by a solution impregnation method to synthesize a 2D/3D-MCN photocatalyst. As a result, the as-prepared 0D/3D-MCN-3.5% composite containing 3.5 wt% 0D-MoS2 QDs exhibited the highest photocatalytic H2 evolution rate of 817.1 μmol h−1 g−1, which was 1.9 and 19.4 times higher than that of 2D/3D-MCN-5% (containing 5 wt% 2D-MoS2 nanosheets) and 3D-CN, respectively. The results of XPS and electrochemical tests confirmed that a p–n heterojunction was formed in the 0D/3D-MCN-3.5% composite, which could accelerate the electron and hole movement in the opposite direction and retard their recombination; however, it was not found in 2D/3D-MCN-5%. This study revealed the relationship among the morphologies of MoS2 using g-C3N4 as a substrate, the formation of a p–n heterojunction, and the H2 evolution activity; and provided further insights into fabricating a 3D g-C3N4-based photocatalyst with a p–n heterojunction for photocatalytic H2 evolution.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Gaiying Han,Pei Wang,Xinxin Zhang,Zhaoyang Wang,Haitao Yu,Zhenzi Li,Ying Xie,Wei Zhou
To solve the limited active sites, high carrier recombination rate, and the photo-corrosion issues of layered MoS 2 , a novel chemically bonded BaTiO 3 /MoS 2 (BM-x, x = 2, 5, 10, and 20) dual piezoelectric heterojunction was synthesized. Density functional theory (DFT) calculations combined with experimental characterizations revealed that chemical bonds are formed between the 3d orbitals of Ti in BaTiO 3 and the 3p orbitals of S in MoS 2 . These strong interactions enable BaTiO 3 to be firmly anchored on the surface of 2D MoS 2 sheets and thus enhance the structural stability of the catalyst. Furthermore, the intimate interfacial contact facilitates electron transfer from BaTiO 3 to MoS 2 , while the formed type-II heterostructure induces a built-in electric field that significantly improves the generation and separation of photogenerated charge carriers. Under the synergistic effect of ultrasonic vibration and light irradiation, the valence band maximum (VBM) and conduction band minimum (CBM) of the two phases become tilted, resulting in a significant increase in the planar potential difference between them and therefore enhancing the built-in electric field. Thus, the BM-10 sample achieves a high degradation rate and an excellent Cr(VI) removal efficiency. These findings provide new insights into the structural regulation and the optimization of catalytic activity for MoS 2 -based piezoelectric photocatalysts.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）