Journal of Advanced Ceramics
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2022
·Vol. 11
·期 7
·1117-1130
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IF 11.534
Tao Junnan,Wang Mingyuan,Liu Guiwu,Liu Qinqin,Lu Lei,Wan Neng,Tang Hua,Qiao Guanjun
Converting water into hydrogen fuel and oxidizing benzyl alcohol to benzaldehyde simultaneously under visible light illumination is of great significance, but the fast recombination of photogenerated carriers in photocatalysts seriously decreases the conversion efficiency. Herein, a novel dual-functional 0D Cd 0.5 Zn 0.5 S/2D Ti 3 C 2 hybrid was fabricated by a solvothermally in-situ generated assembling method. The Cd 0.5 Zn 0.5 S nano-spheres with a fluffy surface completely and uniformly covered the ultrathin Ti 3 C 2 nanosheets, leading to the increased Schottky barrier (SB) sites due to a large contact area, which could accelerate the electron-hole separation and improve the light utilization. The optimized Cd 0.5 Zn 0.5 S/Ti 3 C 2 hybrid simultaneously presents a hydrogen evolution rate of 5.3 mmol/(g·h) and a benzaldehyde production rate of 29.3 mmol/(g·h), which are ∼3.2 and 2 times higher than those of pristine Cd 0.5 Zn 0.5 S, respectively. Both the multiple experimental measurements and the density functional theory (DFT) calculations further demonstrate the tight connection between Cd 0.5 Zn 0.5 S and Ti 3 C 2 , formation of Schottky junction, and efficient photogenerated electron—hole separation. This paper suggests a dual-functional composite catalyst for photocatalytic hydrogen evolution and benzaldehyde production, and provides a new strategy for preventing the photogenerated electrons and holes from recombining by constructing a 0D/2D heterojunction with increased SB sites.
研究领域:
材料科学
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化学工程
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能源科学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2018
·
IF 6.434
Jianhao Qiu,Xiong-Fei Zhang,Xingguang Zhang,Yi Feng,Yuxin Li,Lvye Yang,Haiqiang Lu,Jianfeng Yao
A novel and highly efficient photocatalyst of Cd 0.5 Zn 0.5 S@ZIF-8 nanocomposite has been developed by a facile self-assembly strategy. This is the first report on the application of Cd x Zn 1−x S and metal-organic framework (MOF) nanocomposite as photocatalysts for the reduction of Cr(VI). The resulting Cd 0.5 Zn 0.5 S@ZIF-8 exhibited higher photocatalytic activity than that of pristine Cd 0.5 Zn 0.5 S and ZIF-8. Particularly, the CZS@Z60 composite with 60 wt% of ZIF-8 exhibited a photocatalytic activity that is about 1.6 times as high as that of Cd 0.5 Zn 0.5 S. The dominant reason for the improved photocatalytic reduction potential is proved to be the newly-formed interfacial S Zn bonds that firmly connect Cd 0.5 Zn 0.5 S and ZIF-8 and substantially improve the separation efficiency of photo-excited electrons and holes. The newly-formed chemical bonds are confirmed by XPS analyses, and the prolonged lifetime of photo-excited electrons is evidenced by the electrochemical measurement of photocurrent, which shows that the photocurrent on Cd 0.5 Zn 0.5 S@ZIF-8 is much higher than that of Cd 0.5 Zn 0.5 S and ZIF-8. This study clearly demonstrates that the MOF-based composite nanomaterials hold great promises for applications in the field of environmental remediation and for design of novel photocatalytic materials.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Fang Chen,JiaYu Liao,Xuan Lu,YuZhi Xu,XiaoHuan Jiang,Mengkui Tian
Exploring efficient and stable water-splitting photocatalysts is critical for realizing conversion solar energy into hydrogen energy. Herein, a unique 2D/2D S-scheme Cd 0.5 Zn 0.5 S/CuInS 2 heterojunction with sulfur vacancies was rationally designed by chemically converting inorganic–organic hybrid ZnS(en) 0.5 into inorganic Cd 0.5 Zn 0.5 S nanosheets and fabricating with CuInS 2 at 350 °C under an N 2 atmosphere. The final Cd 0.5 Zn 0.5 S/CuInS 2 photocatalyst was composed of thin nanosheets with a substantial interfacial contact area, which enhanced light absorption and allowed directional charge transfer and separation. Under visible light irradiation, the photocatalytic H 2 evolution activities of Cd 0.5 Zn 0.5 S nanosheets is 0.79 mmol·g −1 ·h −1 , which is greater than other solid solution materials obtained by varying Cd and Zn ratios. The 2D/2D nanosheets with 8% CuInS 2 exhibit excellent hydrogen evolution activity with yields of 7.73 mmol·g −1 ·h −1 , which are 9.8 and 138 times higher than Cd 0.5 Zn 0.5 S and CuInS 2 . In addition, Cd 0.5 Zn 0.5 S/CuInS 2 photocatalyst demonstrates outstanding stability and activity over the course of 24-hour period. Moreover, the transfer pathway of photogenerated charges were explored by the energy band bending, which proved that an S-scheme heterojunction is synthesized successfully.This work offers a useful methodology for analyzing S-scheme heterojunction with abundant sulfur vacancies, and improving the solar hydrogen evolution performance of Cd 0.5 Zn 0.5 S photocatalyst.
研究领域:
材料科学
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能源化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Meng Li,Jingxue Sun,Bowen Cong,Shunyu Yao,Gang Chen
The optical and electronic properties of plasmonic semiconductor nanomaterials have attracted a lot of attention. In this study, sulfur vacancies was regulated to achieve carriers density of 10 17 ~ 10 23 cm −3 , with the characteristics of localized surface plasmon resonance (LSPR). Since the excitation of LSPR, the plasma electrons on the semiconductor surface are elevated to a higher energy state. These electrons can overcome the energy barrier between BS and Cd 0.5 Zn 0.5 S (CZS), directly transferred to the conduction band (CB) CZS components as electron donor. This effect may cause more electrons on the semiconductor CB to react with H 2 O to generate more hydrogen. By calculating the Debye length, the scale of the charge effect in the plasma is measured. It can be proved that LSPR is instrumental in the available separation of electrons and holes in semiconductors, and significantly improves the hydrogen production effect of CZS/BS-1.5 nanocomposites. This research furnishes new insights for the construction of efficient and novel polyphase photocatalysts.
研究领域:
材料科学
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光催化
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产品关联
DOI
高影响因子
INORGANICA CHIMICA ACTA
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2023
·
IF 2.8
Xiaoyan Zhao,Shirong Kang,Hao Zhang,Hua Yang,Mingyu Dou,Haitao Zhao,Dacheng Li,Jianmin Dou
Photocatalytic water splitting to produce H 2 is a promising method to directly convert solar energy into chemical energy, which is a superb solution to the human energy shortage. This work constructed an efficient photocatalyst using Cd 0.5 Zn 0.5 S NPs (CZS) as the photosensitizer, water-soluble binuclear cobalt bis(4-methothiocarbazide) complex as the molecular co-catalyst. The complex could effectively transport photogenerated electrons on CZS, thus inhibiting charge recombination and significantly improving the activity and stability of the present photocatalytic system. Under optimal conditions, the experimental results showed that the highest turnover number (TON) of H 2 production was 5699 after the reaction of the photocatalytic system with visible light (λ > 420 nm) for 24 h. The average H 2 evolution rate of 1221 μmol∙h −1 was 6.4 times higher than that of pure CZS. The highest apparent quantum yield (AQY) at 420 nm was ∼26%.
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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
·
IF 5.816
Xue Zhang,Zhiwei Cheng,Puhui Deng,Linping Zhang,Yu Hou
A designed type-II heterojunction photocatalyst , NiSe 2 /Cd 0.5 Zn 0.5 S (NiSe 2 /CZS), was successfully synthesized and it exhibits outstanding photocatalytic hydrogen evolution performance. The optimal loading amount of NiSe 2 on Cd 0.5 Zn 0.5 S is 13 wt %, and the corresponding hydrogen production rate is approximately 121.01 mmol g −1 h −1 under visible light. The heterojunction structure between Cd 0.5 Zn 0.5 S and NiSe 2 promoted the separation of photogenerated electron-hole pairs, effectively suppressed the photogenerated carrier recombination and endowed the material with excellent interfacial charge transfer properties, thus improving the photocatalytic performance.
研究领域:
材料科学
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化学
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能源科学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 32
·10973-10984
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IF 6.4
Ming Du,Shilei Ji,Canhui Qian,Lutao Li,Wei Chen,Huajie Huang,Jianping Yang,Jian Zhang,Xinbao Zhu,Xing’ao Li
The accessibility of photogenerated charge transfer channels and the activity of catalytic reaction sites are critical for efficient hydrogen evolution reaction (HER). Herein, a 3D porous N-doped Ti3C2Tx MXene matrix confining Cd0.5Zn0.5S nanoparticles (N-TCT@CZS) was fabricated via electrostatic absorption, thermal nitridation, and in situ growth processes, forming a stable heterojunction with excellent photocatalytic HER activity. Comprehensive experimental and theoretical analyses indicated that N dopants could induce more unsaturated structures and increase the abundance of active sites, while the 3D N-TCT MXene matrix with a stable scaffold configuration and interconnected porous channels could promote charge transfer kinetics, which synergistically realizes electronic structure modulation and spatial configuration design of photocatalysts. Besides, the Cd–N bonds between the N-TCT MXene and CZS enhance the interfacial interaction and expedite the directional interfacial charge transfer, thus substantially boosting photocatalytic hydrogen evolution. Consequently, the optimal N-TCT@CZS-3 nanohybrid photocatalyst possesses a superior photocatalytic HER rate of 10.90 mmol g−1 h−1, which is 4.8 times higher than that of the pristine CZS nanoparticles. This work proposes an applicable avenue for designing and fabricating novel functional 3D MXene-supported semiconductor materials for solar energy conversion.
研究领域:
材料科学
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能源化学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2016
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IF 3.205
Linen Wu,Jie Gong,Lei Ge,Changcun Han,Siman Fang,Yongji Xin,Yujing Li,Yan Lu
In this study, novel AuPd bimetallic co-catalyst decorated Cd 0.5 Zn 0.5 S photocatalyst was successfully synthesized via an in-situ chemical deposition method . The physical as well as the photophysical properties of the as-obtained AuPd/Cd 0.5 Zn 0.5 S samples were characterized by X-ray diffractometry (XRD), Transmission electron microscope (TEM), UV–vis diffuse reflection spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS) and surface photovoltage spectroscopy (SPV). The AuPd bimetallic co-catalysts showed dramatic photo-generated charge separation efficiency in Cd 0.5 Zn 0.5 S sample, and thus significantly enhance the H 2 production activity under visible light irradiation. The AuPd/Cd 0.5 Zn 0.5 S sample with 0.5 wt% content had the highest catalytic activity , and the corresponding H 2 evolution rate is 3.65 mmol g −1 h −1 , which was about 12 times as that of pure Cd 0.5 Zn 0.5 S sample under visible light irradiation . The photocatalytic activity of the photocatalyst was stable even after 9 cycling photocatalytic experiments. A possible mechanism on the photocatalytic enhancement of AuPd NPs was systematically investigated, which can provide a novel concept for the synthesis of other desirable photocatalytic materials.
研究领域:
材料科学
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光催化
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纳米材料
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能源化学
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半导体物理
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表面科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Jiahui Yu,Ping Su,Dong Zhang,Huaihao Zhao,Nan Yang,Tengteng Liang,Dafeng Zhang,Xipeng Pu
Rationally designing a Step-scheme (S-scheme) hetero-structured photocatalyst with high redox capability and separation efficiency of photoinduced carriers is considered as an attractive approach to address the shortcomings of single component and traditional hetero-structured photocatalyst. Herein, enlightened by the predictions of density functional theory (DFT), a unique S-scheme heterojunction photocatalyst was successfully fabricated by incorporating zero-dimensional (0D) Cd 0.5 Zn 0.5 S (CZS) on two-dimensional (2D) lamellar Cu 2 MoS 4 (CMS) plates via a facile coprecipitation method, which substantially enhances the photocatalytic activity for hydrogen (H 2 ) generation. CZS nanoparticles deposited on the surface of CMS nanoplates play a crucial role in creating highly intimate heterojunction interfaces and abundant exposed reaction sites, laying the foundation for improved photocatalytic performance. Furthermore, the significant difference in Fermi levels and band structures between CZS and CMS result in the formation of the internal electric field (IEF) and energy band bending at the interface of the heterojunction. This S-scheme charge transfer path enables 0D/2D CZS/CMS heterojunction possesses an exceptional capacity to maintain the robust redox potential and boosts the separation efficiency of light-induced carriers, as verified by DFT calculations and energy band structure analyses. As expected, the optimal heterojunction exhibits a satisfactory H 2 generation rate of 13.1 mmol·g -1 ·h −1 , which is nearly 7.7-fold higher than that of individual CZS. This study is expected to inspire the design of morphology-controlled hetero-structured photocatalyst with S-scheme charge transfer route for photocatalytic H 2 generation.
研究领域:
材料科学
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光催化
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纳米技术
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能源材料
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Bo Lv,Xuefan Feng,Xinyan Feng,Xiaoming Wang,Zhenyu Yuan,Bowen Xu,Yu Yang,Fuqin Zhang
Using photocatalysts to produce hydrogen from photocatalytic water splitting is a green approach for producing renewable energy with minimum environmental impact. The key to the success of this technology is to develop an efficient hydrogen production catalyst with stable performance. In this work, we report a simple two-step preparation of zinc carbonate modified with Cd 0.5 Zn 0.5 S/Ni(HCO 3 ) 2 composite. The participation of Ni(HCO 3 ) 2 co-catalyst improved the visible light activity, which also irreversibly inhibited the recombination of holes and electrons. Meanwhile, the novel 0D and 2D heterojunctions are responsible for the excellent catalytic performance with superior stability. The catalytic hydrogen production reached the best rate of 64 mmol/g/h with the cumulative hydrogen production of 320 mmol/g in 5 h, which is even better than that from the photocatalysts activated with the precious metal, Pt. The underlying mechanism was rationalized by the hydrogen evolution kinetics analysis. The excellent hydrogen production performance, presented in this work, demonstrated that the composite of zinc carbonate modified with Cd 0.5 Zn 0.5 S/Ni(HCO 3 ) 2 is a promising, economical and efficient choice of the photocatalyst.
研究领域:
材料科学
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能源化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Pengpeng Zhang,Chao Xue,Yukun Li,Shuaiwei Guo,Xilai Zhang,Peng Zhang,Guosheng Shao
High-efficiency light utilization and prolonged lifetime of photo-induced charge carriers is a key step towards superior photocatalytic H 2 evolution. Herein, the design of a novel spatially separated Ni 2 P co-catalyst decorated SiO 2 /rGO/Cd 0.5 Zn 0.5 S yolk-shell structural photocatalytic nanoreactor is reported. In this system, the advantages of ultrathin mesoporous shell and yolk-shell structure not only facilitate the mass diffusion with short length, but also allow broad-spectrum light absorption and increase the density of catalytic active sites. Importantly, the photo-generated electrons can be directionally injected from the outermost Cd 0.5 Zn 0.5 S shell to the spatially separated Ni 2 P co-catalyst. The dynamic behaviors of photo-induced charge carriers can be rationally regulated by the suitable energy level alignment and the built-in electric fields derived from both sides of embedded rGO interlayer. The synergistic effects of the excellent light-harvesting ability, more exposed active sites and improved charge separation efficiency significantly boosted the photocatalytic performances of hydrogen evolution. As a result, the optimal SiO 2 /Ni 2 P/rGO/Cd 0.5 Zn 0.5 S composite exhibited the highest hydrogen generation of 11.65 mmoL‧g −1 ‧h −1 , even after five cycles. This work proposes new insights into the design of the efficient hollow sphere structural heterojunctions for photocatalytic water splitting applications.
研究领域:
材料科学
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纳米技术
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光化学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
·
2019
·Vol. 645
·期 24
·1384-1392
·
IF 1.337
Dan-Dan Yang,Jia-Jun Hu,Hong Zhang,Xiao-Jun Lv,Yong Chen,Wen-Fu Fu
The Ni 2 P@Cd 0.5 Zn 0.5 S nanoparticles photocatalyzed self-coupling of p -xylene was reported here, and the corresponding coupling product 1,2-di- p -tolylethane was obtained. The reaction could be extended to toluene derivatives with electron-donating and electron-withdrawing substituents. Ni 2 P@Cd 0.5 Zn 0.5 S nanoparticles had already been characterized by XRD, ICP-AES, SEM, TEM, UV/Vis, FL, XPS. The Mott–Schottky curves of Ni 2 P@Cd 0.5 Zn 0.5 S were made through electrochemical methods. An active carbon free-radical was captured through ESR measurement under irradiation. The research demonstrated this photocatalytic system feasible for the self-coupling reaction of toluene derivatives.
研究领域:
光催化
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有机合成
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材料化学
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纳米材料
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物理化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）