CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Xing-Liang Yin,Lei-Lei Li,Jian-Hua Jiang,Xin-Xin Du,Dong-Hui Pang,Jie Yang,Zhong-Jia Li,Yuan-Xu Wang,Xin-Yue Li,Da-Cheng Li,Jian-Min Dou
Photocatalytic H 2 evolution from water splitting offers an attractive scientific and technological method to address the energy and environmental crisis. In this study, noble-metal-free Zn 0.5 Cd 0.5 S@MoS 2 core@shell nanoheterostructures were elaborately designed and successfully synthesized. The visible-light-driven photocatalytic performance investigation shows that the Zn 0.5 Cd 0.5 S@MoS 2 exhibits a state-of-the-art H 2 evolution rate of 40.2 mmol g −1 h −1 far exceeding that of pristine Zn 0.5 Cd 0.5 S by more than 57 times. Moreover, thanks to the protection of MoS 2 shells, the Zn 0.5 Cd 0.5 S@MoS 2 can retain long-term stability in four-cycles of 24 h reactions. Furthermore, a tentative mechanism on H 2 generation was systematically investigated and proposed, which contributes to understand the enhanced photocatalytic activity of the Zn 0.5 Cd 0.5 S@MoS 2 heterostructures and may inspire the synthesis of other desirable catalytic systems.
研究领域:
材料科学
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物理化学
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能源化学
·
纳米催化
·
光化学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Jian Gao,Shu Wang,Shuang Han,Wenlong Yang
The rational design and efficient utilization of room-temperature ferroelectric physical field photocatalysts are of significant importance for addressing energy and environmental challenges. In this work, ferroelectric-based Zn 0.5 Cd 0.5 S/PbTiO 3 S-scheme heterojunction photocatalyst was synthesized via a facile and mild two-step hydrothermal method. The heterostructure was constructed through in-situ selective growth of Zn₀.₅Cd₀.₅S nanoparticles onto the positively polarized surface of PbTiO₃ microplates. The underlying mechanism of this ferroelectric polarization-driven selective growth was systematically investigated through combined theoretical simulations and experimental analyses. Furthermore, the charge transfer behavior within the heterostructure, the synergistic enhancement mechanism of the built-in electric field, and the photocatalytic Cr(VI) reduction performance along with influencing factors were comprehensively examined via DFT calculations and a series of characterization techniques. Zn 0.5 Cd 0.5 S/PbTiO 3 S-scheme heterojunction catalyst integrates three key aspects for boosting photocatalytic efficiency, including the increased solar spectrum response, the enhanced photogenerated charge separation, and the improved surface chemical reaction. As a result, it exhibits an optimal Cr(VI) reduction rate of 15.16 μmol·min⁻¹ ·g⁻¹ , which is 5.5 times higher than that of pristine PbTiO₃. This provides a new design and application of the synergistic and enhanced effect on ferroelectric-based artificial-photosynthesized heterojunction catalyst.
研究领域:
材料科学
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环境催化
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光催化
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铁电材料
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纳米材料
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能源与环境科学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Yidong Sun,Xingpu Wang,Qiang Fu,Chunxu Pan
Photocatalytic decomposition of water for hydrogen production is considered a promising solution to address the issues of energy crisis and environmental pollution. Herein, a kind of novel hollow flower-like 0D/3D Zn 0.5 Cd 0.5 S/NiCoZn-LDH with an n-n heterojunction is synthesized via precipitation and cation-exchange methods. Photocatalytic experiments reveal that the composite photocatalyst exhibits excellent performance compared with pure Zn 0.5 Cd 0.5 S. In other words, the composite photocatalyst shows enhanced response to visible light, three-fold increased transient photocurrent, and the hydrogen production rate reaching to 1100 μmol/h/g, approximately 7.3 times higher relative to pure Zn 0.5 Cd 0.5 S. The reaction mechanism is also elucidated. Zn 0.5 Cd 0.5 S/NiCoZn-LDH shows a type II n-n heterojunction, which can effectively transfer and separate the photo-generated electrons and holes, and is beneficial for the photocatalytic hydrogen production reaction. The synthesized composite photocatalyst is prepared using a simple method, enabling future large-scale production and applications.
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DOI
高影响因子
Nano Energy
·
2016
·
IF 11.553
Zongwei Mei,Bingkai Zhang,Jiaxin Zheng,Sheng Yuan,Zengqing Zhuo,Xianguang Meng,Zonghai Chen,Khalil Amine,Wanli Yang,Lin.-Wang Wang,Wei Wang,Shufeng Wang,Qihuang Gong,Jun Li,Fu.-Sheng Liu,Feng Pan
Cu-doping into Zn 1−x Cd x S can greatly enhance the photocatalytic H 2 evolution from water splitting under visible-light irradiation. However, it is still controversial for how the Cu-dopant improves this performance. Here, we report that appropriate Cu-doped Zn 0.5 Cd 0.5 S nanocrystals reach 21.4 mmol/h/g of H 2 evolution rate without cocatalyst in the visible-light region, which is also 2.8 times as high as that of the undoped counterpart, and the corresponding apparent quantum efficiency is 18.8% at 428 nm. It is firstly confirmed that the Cu 2+ changes into Cu + after being doped by soft X-ray absorption spectroscopy (sXAS). We theoretically propose that the transformation of 2Cu 2+ to 2Cu + results in one adjacent S 2 − vacancy (V S ) in host during the doping process, while the Cu + -dopant and V S attract the photoexcited holes and electrons, respectively. Accordingly, the photocatalytic activity is improved due to the enhanced separation of photoexcited carriers accompanied with the enhanced light absorption resulting from the Cu + -dopant and 2Cu + /V S complex as possible active site for photocatalytic H 2 evolution.
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高影响因子
Advanced Materials Interfaces
·
2020
·Vol. 7
·期 12
·2000010
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IF 4.948
Puttaswamy Madhusudan,Run Shi,Bananakere Nanjegowda Chandrashekar,Shengling Xiang,Ankanahalli Shankaregowda Smitha,Weijun Wang,Haichao Zhang,Xian Zhang,Abbas Amini,Chun Cheng
Solar water splitting using semiconductor photocatalysts is considered to be one of the economical and significant techniques for hydrogen evolution. In this study, graphene–Zn x Cd 1− x S (ZCS) heterojunction is fabricated by hydrothermal method followed by simple photodeposition of ultrathin few layers of molybdenum sulfide (MoS 2 ) nanosheets. The results show that compared with pristine ZCS and 1 wt% graphene mixed ZCS photocatalysts, the 1 wt% graphene and 1 wt% MoS 2 photodeposited ZCS composited sample shows 39.5 mmol h −1 g −1 hydrogen production activity, which is 6.9 and 1.9 times significantly higher, respectively, with an apparent quantum yield of 53% at 420 nm visible light is recorded. The improved photocatalytic activity can be attributed to the formation of heterostructure interface between p-type MoS 2 nanosheets with n-type ZCS host, which allows for the faster transfer of the photogenerated electrons and thus significantly promotes the separation of photogenerated charge carriers.
研究领域:
材料化学
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光催化
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能源科学
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纳米材料
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半导体物理
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可持续能源
·
表面科学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Sheng Zhao,Jing Xu,Min Mao,Lingjiao Li,Xuanhao Li
Based on hollow spherical NiCo 2 S 4 , Zn x Cd 1-x S with adjustable band structure was used to construct a composite for photocatalytic hydrogen evolution. The hollow spherical structure of NiCo 2 S 4 gives Zn x Cd 1-x S more contact positions to form a stable heterojunction. Through the band structure adjustment for Zn x Cd 1-x S, the induced electron transfer model was transformed into Z-scheme, which effectively enhances the photo-produced carrier separation efficiency of the composite material. At the same time, the fast electron transfer is realized by the great conductivity of the hollow spherical NiCo 2 S 4. This allows the composite material to obtain a shorter average lifetime of PL (0.15 ns) compared to Zn 0.5 Cd 0.5 S (3.9 ns). The composite NiCo 2 S 4 @Zn 0.5 Cd 0.5 S with Z-scheme heterojunction exhibited excellent photocatalytic HER activity and stability due to its unique spatial structure and efficient Z-scheme electron transfer path. The optimized composite NiCo 2 S 4 @Zn 0.5 Cd 0.5 S 1:1 photocatalytic HER rate reached 233.68 μmol . h −1 , which is equivalent to 5.81 times that of Zn 0.5 Cd 0.5 S (40.25 μmol . h −1 ).
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Dongsheng Dai,Lu Wang,Nan Xiao,Songsong Li,Hao Xu,Shuang Liu,Boran Xu,Da Lv,Yangqing Gao,Weiyu Song,Lei Ge,Jian Liu
Efficient noble-metal-free semiconductor composite photocatalysts are highly desirable for visible light driven water splitting. In this study, Ni 2 P was successfully decorated on Zn 0.5 Cd 0.5 S as a highly efficient co-catalyst via a hydrothermal method . The chemical as well as photophysical properties of the as-obtained Ni 2 P/Zn 0.5 Cd 0.5 S samples were characterized by X-ray diffractometry (XRD), Transmission electron microscope (TEM), UV–vis diffusion reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL) and time-resolved fluorescence. The Ni 2 P/ Zn 0.5 Cd 0.5 S composite sample with 4% molar content of Ni 2 P showed the highest photocatalytic H 2 evolution activity with a corresponding H 2 evolution rate of 1173 μmol h −1 , which was about 13 times higher than that of pure Zn 0.5 Cd 0.5 S sample under visible light irradiation. The photocatalytic activity of the Ni 2 P/Zn 0.5 Cd 0.5 S composite sample was stable even after 4 cycling photocatalytic experiments. A possible mechanism on the photocatalytic enhancement of the Ni 2 P/Zn 0.5 Cd 0.5 S composite sample was systematically investigated, which can provide a novel concept for the synthesis of other desirable semiconductor materials with high photocatalytic performance.
研究领域:
材料科学
·
光催化
·
能源化学
·
半导体催化
·
清洁能源
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Xiangyu Zhou,Jingbo Wu,Yan Xiao,Yinhua Jiang,Wenli Zhang,Yan Liu,Zhanchao Liu,Jianming Zhang
Reasonable design and construction of heterogeneous photocatalysts with close interface contact are considered as the effective strategy to realize the application of highly efficient solar for hydrogen evolution and pollutant degradation. Here, a novel Zn 0.5 Cd 0.5 S nanospheres/Sn 3 O 4 nanosheets (ZCS/SO) heterostructure photocatalyst was firstly synthesized using a simple hydrothermal method, where Zn 0.5 Cd 0.5 S nanospheres in-situ grew on the surfaces of Sn 3 O 4 nanosheets derived by ultrasonicating Sn 3 O 4 nanoflowers. The synthesized ZCS/SO heterostructure exhibited much higher photocatalytic activity for H 2 production and tetracycline hydrochloride (TCH) degradation than pristine Sn 3 O 4 and Zn 0.5 Cd 0.5 S. The optimal ZCS/SO-10 performed the highest rate of hydrogen production of 7.19 mmol·g −1 ·h −1 , which was 112.3 and 3.6 times those of Sn 3 O 4 and Zn 0.5 Cd 0.5 S, respectively. And the AQY of ZCS/SO-10 for H 2 evolution was up to 16.6 % at λ = 420 nm. Moreover, ZCS/SO-10 displayed the highest TCH degradation rate (0.0484 min −1 ), which were 228.3 and 1.9 times those of Sn 3 O 4 (0.000212 min −1 ) and Zn 0.5 Cd 0.5 S (0.0249 min −1 ). Such excellent dual-functional photocatalytic performance of ZCS/SO heterostructure could be attributed to the synergistic effect between Sn 3 O 4 and Zn 0.5 Cd 0.5 S as well as the formation of heterogenous interfaces with close contacts, which greatly increased specific surface area, enlarged spectral response range, enhanced hydrophilicity and accelerated photogenerated charge transfer, resulting in the improvement of photogenerated charge yield and photoreaction efficiency. Detailed electron transport mechanisms and possible degradation paths of TCH were also proposed. This work provides a feasible strategy for the preparation of transition metal sulfide photocatalysts efficiently utilizing solar energy to realize the production of clean energy and water environmental remediation.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yongxin Jiao,Shu Wang,Yupu Liu,Xin Li,Wenlong Yang,Shuang Han,Hui Zhang,Jiuxing Jiang
The artificial-photosynthetic semiconductor composites have attracted tremendous attention with respect to their enhanced photocatalytic properties. Herein, we reported the facile synthesis of Zn 0.5 Cd 0.5 S/WO 3 ·H 2 O S-scheme photocatalyst via one-pot in situ hydrothermal strategy. Density Functional Theory (DFT) calculation was employed to reveal the S-scheme photogenerated electron transfer mechanism, and the subsequent experimental characterization further illustrated the path for electron-hole transfer and separation under the effect of S-scheme heterojunction. The mass of WO 3 ·H 2 O accounted for Zn 0.5 Cd 0.5 S/WO 3 ·H 2 O 48 wt% (ZCSW48) was the best high-efficiency S-scheme photocatalyst displayed significant photocatalytic properties on pollution degradation, in detail, with the Cr (VI) photoreduction rate of 2.27 μmol·s −1 ·g −1 cat. and the Rhodamine B (RhB) photooxidation rate of 0.38 μmol·min −1 ·g −1 cat. , respectively. The designed Zn 0.5 Cd 0.5 S/WO 3 ·H 2 O photocatalysts have integrated with the three aspects of photocatalytic efficiencies including the visible light response, prolonged photogenerated carrier lifetime and the sufficient surface active sites due to amount of surface defects , therefore, this work provides more insights into the utilization of green energy for environmental treatment by artificial structured semiconductors.
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