APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Dongsheng Dai,Hao Xu,Lei Ge,Changcun Han,Yangqin Gao,Songsong Li,Yan Lu
The generation of hydrogen (H 2 ) through photocatalytic water splitting with the employment of various co-catalysts has attracted much attention. In this study, the CoP was successfully decorated on Zn 0.5 Cd 0.5 S as a highly efficient co-catalyst via a two-step in-situ chemical deposition method. The chemical as well as photophysical properties of the as-obtained CoP/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) and surface photovoltage spectroscopy (SPV). The CoP/Zn 0.5 Cd 0.5 S composite sample with 5% molar content showed the highest photocatalytic H 2 evolution activity with a corresponding H 2 evolution rate of 734 umol h −1 , which was about 20 times higher than that of pure Zn 0.5 Cd 0.5 S sample and 2 times higher than Pt loaded Zn 0.5 Cd 0.5 S sample under visible light irradiation. The photocatalytic activity of the CoP/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 CoP was systematically investigated, which can provide a novel concept for the synthesis of other desirable photocatalytic materials with high photocatalytic performance.
研究领域:
材料科学
·
光催化
·
能源化学
·
纳米材料
·
半导体催化
·
太阳能转化
·
氢能
✓ 已验证
DOI
高影响因子
ChemCatChem
·
2019
·Vol. 11
·期 11
·2657-2666
·
IF 4.495
Jun-Shuai Zhang,Wei-De Zhang
Graphical Let the sun shine ! Photocatalytic hydrogen evolution is an attractive way to convert sunlight to fuel for solving worldwide energy shortage and environment issues. This study demonstrates non-noble photocatalysts consisting cobalt complex and graphitic carbon nitride, in which CoL 2 (SCN) 2 cocatalyst was covalently grafted onto CN. This hybrid exhibits excellent performance towards photocatalytic H 2 generation (272 μmol g −1 h −1 ) from water medium and also presents high stability, which provides a novel way for designing high activity and low-cost photocatalysts for solar H 2 conversion. To develop stable, efficient, non-noble metal-based photocatalysts for water splitting has become a long-standing challenge. Here, cobalt−phenanthroline active species are grafted from metal-free photosensitive carbon nitride nanosheets (CN) by dehydration reaction between pendant amino groups from CN and carboxyl groups of functional phenanthroline ligands for photocatalytic H 2 evolution in water medium. The cobalt complex unit serves as a cocatalyst to accelerate separation and transferring of photoexcited charge carriers, and reduce overpotential for H 2 evolution. The hybrid catalyst without any precious metals exhibits excellent performance of H 2 evolution (272 μmol g −1 h −1 ) and high stability during photocatalytic reaction. The finding not only develops a facile way to prepare high-performance low-cost photocatalysts for photocatalytic H 2 production, but also provides a new insight into optimizing the interface between cocatalysts and photosensitizers for photocatalytic reaction by grafting active sites directly from semiconductors.
研究领域:
材料科学
·
化学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Haiyan Shen,Dawei Ni,Ping Niu,Yi Zhou,Tianyou Zhai,Ying Ma
Spatially controlled co-loading of both oxidation and reduction cocatalysts on semiconductor photocatalysts has been demonstrated to be favorable for photogenerated charge separation and thus enhanced photocatalytic activity. Herein, we presented a simple ball-milling method to improve photocatalytic H 2 production of TiO 2 by co-loading of oxidation cocatalyst Co 3 O 4 with reduction cocatalyst CuO , wherein the Co 3 O 4 loading amount was significant especially for TiO 2 loaded with sufficient or optimum CuO. In comparison with that on TiO 2 loaded with only CuO, the photocatalytic H 2 production from water over TiO 2 photocatalyst co-loaded with CuO and trace Co 3 O 4 was enhanced by approximately 5.5 times, even though complex spatial control was not adopted. In contrast, remarkable improvement of photocatalytic activity after Co 3 O 4 co-loading was only observed on TiO 2 photocatalysts loaded with less CuO in the presence of methanol. Better separation of photogenerated charges on the surface of dual-cocatalysts modified TiO 2 was further demonstrated by decreased luminescence as well as increased photogenerated electrons and hydroxyl radicals as compared to those loaded with only CuO.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Yue Han,Changdi Wang,Ruiyang Zhao,Jishu Han,Lei Wang
In order to alleviate environmental pollution and energy crisis caused by the excessive use of fossil fuels, photocatalytic water splitting to produce hydrogen as an alternative fuel has attracted widespread attention. The construction of heterojunction photocatalyst is considered to be one of the effective ways to enhance the photocatalytic hydrogen production efficiency. In this study, Ni-doped CdSe was modified on the surface of hollow ZnSnO 3 double-shell nanocubes. The obtained Cd 0.9 Ni 0.1 Se/ZnSnO 3 possessed high photocatalytic activity under visible light irradiation. The photocatalytic hydrogen production rate could reach to 6458.0 μmol/g/h. The successful construction of hollow Cd 0.9 Ni 0.1 Se/ZnSnO 3 double-shell type-I heterojunction increased visible light absorption, shortened the charge transport distance, and inhibited the recombination of electron-hole pairs, thus enhancing the photocatalytic hydrogen production performance of Cd 0.9 Ni 0.1 Se/ZnSnO 3 . It provided the idea for promoting the design of solar to chemical energy conversion and the effective guidance for constructing a high-efficient and stable photocatalyst.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Gege He,Junsheng Wang,Xiaozhen Lv,Shun Lu
Hydrogen is increasingly acknowledged as a viable alternative to traditional fossil fuels. However, the photothermal properties of CoFe 2 S 4 , a photocatalyst displaying metal-like behavior, have not been adequately explored in the context of photocatalytic H 2 generation. To improve photocatalytic hydrogen evolution, it is crucial to understand how to expedite the transfer of photogenerated electrons and the dissociation of H-OH bonds for enhanced hydrogen ion release. Herein, a type-II heterostructure was constructed between CoFe 2 S 4 nanosheets and ZnIn 2 S 4 nanoparticles, a non-precious metal photocatalyst, which effectively separates photogenerated carriers and holes. More importantly, the photothermal effect and localized surface plasmon resonance (LSPR) effects induced by CoFe 2 S 4 improved the sluggish kinetics of water dissociation. The CoFe 2 S 4 /ZnIn 2 S 4 -5 photocatalyst achieved H 2 evolution rate of 6.84 mmol·g −1 ·h −1 , and an apparent quantum efficiency of 15.6 % at 400 nm, significantly enhancing the efficiency of photocatalytic splitting for hydrogen production. This work advances the application of metal CoFe 2 S 4 in solar-to-fuel conversion and offers valuable insights for designing semiconductor-based photothermally assisted photocatalytic systems.
研究领域:
材料科学
·
能源科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Pengnian Shan,Kun Geng,Li Guo,Liqiang Kuang,Yu Shen,Bo Xiong,Jianhua Hou,Feng Guo,Guangzhao Wang,Weilong Shi
To advance the development of clean and sustainable energy, photocatalytic H 2 production emerges as an innovative technology that harnesses natural sunlight and water resources to address the current energy crisis. Based on significant contributions of the built-in electric field and photothermal effect for boosted photocatalytic hydrogen production, we developed a core–shell photocatalyst with Co spheres as the core and ZnIn 2 S 4 (ZIS) nanoflowers as the shell to achieve effective synergy between these two effects. Under the strong synergistic influence of the Schottky barrier and photothermal effect, this optimized photocatalyst achieved a maximum photothermal-assisted photocatalytic hydrogen evolution rate of 8.3 mmol g −1 h −1 , which is approximately 11 times that of the pure ZIS, with an apparent quantum efficiency (AQE) of 11.34 % under the wavelength of 420 nm. The Schottky barrier formed between ZIS and Co facilitates the transfer of electrons from Co to ZIS, while the photothermal effect increases the catalyst’s temperature and further enhances the separation efficiency of photogenerated electrons and holes. This work highlights the potential applications of the synergistic effects of Schottky junctions and photothermal effects in the conversion of solar energy into chemical energy.
研究领域:
材料科学
·
能源转换
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Weijie Zhang,Lufang Fan,Kai Wei,Changchang Ma,Sheng Feng
This work provided innovative apertures with great exploratory value for engineering oxygen defects and designing S-scheme photocatalysts for efficient photocatalytic hydrogen production. In this study, the S-scheme heterostructure CdLa 2 S 4 /MoO 3-x (CLSMO) was synthesized by electrostatic self-assembly to solve the problem of electron hole recombination in hydrogen evolution half-reaction. The results showed that the hydrogen precipitation rate of the optimized CLSMO was 41.41 mmol g -1 h −1 , which was 12.70 times higher than that of monomeric CLS. The presence of oxygen vacancies (Ovs) increased the range of light absorption and reduces the surface dynamic barrier. More importantly, the experimental results and density functional theory (DFT) calculations showed that CdLa 2 S 4 and MoO 3-x strictly followed the S-scheme charge transfer path, accumulating photogenerated electrons in the CLS conduction band, and achieving efficient photocatalytic hydrogen evolution. This study provided a new idea to solve the problem of photocatalyst activity using OVs and S-scheme heterojunctions.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 12
·7178-7186
·
IF 10.7
Haiyuan Li,Dingxin Liu
In photocatalysis, catalysts are crucial for effective charge transfer and separation. Using Mo-MOF and CdCo-MOF as precursors, we have designed an effective Cd0.76Cd0.17Mo0.07S (Ethy-CCMS) photocatalyst. We compared the performance of samples prepared in different environments and found that the rod-shaped Ethy-CCMS prepared in an alkaline environment provided by ethylenediamine exhibited the highest photocatalytic hydrogen production activity with an efficiency of 30.14 mmol g−1 h−1, which was 32.2 times higher than that of the CdS prepared under aqueous solution conditions. The solid solution formed can accelerate the separation of photogenerated electrons and avoid the formation of high oxidation power h+ compared to CdS alone. In addition, adding Mo and Co enables these three metals to form bonds with S. The shared S-bond improves the stability of the material and significantly mitigates the photocorrosion phenomenon. This study investigates the role of sulfides derived from Mo-MOF and CdCo-MOF as sustainable and promising co-catalyst candidates to enhance the photocatalytic performance of CdS-based composites.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Hong-Si Guo,Wenfeng Zhao,Qingmei Ge,Nan Jiang,Mao Liu,Hang Cong
A promising method for producing hydrogen from solar energy and converting it into chemical fuels is photoelectrochemical (PEC) water splitting. In this paper, a novel photoanode is prepared by hydrothermal growing of nanorod CdS/g-C 3 N 4 /Q[7] heterojunction on FTO substrate for photoelectrochemical water splitting to produce hydrogen. In this method, Q[7]-doped g-C 3 N 4 is tightly combined with CdS composite and substrate, which significantly improves the separation and migration of photogenerated carriers in g-C 3 N 4 /Q[7] and CdS, and effectively reduces the internal resistance of the photoanode. Compared with the free CdS NRs, the PEC performance of the heterojunction CdS/g-C 3 N 4 /Q[7]-10 is significantly enhanced with the improved photocurrent density of 1049.7 μA/cm 2 under AM 1.5 G (100 mW/cm 2 ) simulated sunlight, which is 3.6 times that of pristine CdS and 2.6 times that of FTO-CdS/g-C 3 N 4 under the same conditions. The external bias photocurrent conversion efficiency and photohydrogen conversion efficiency of CdS/g-C 3 N 4 /Q[7]-10 photoanode at 0.7 V (relative to RHE) are measured to be both 0.31 %, as 3.1 times high as that of the original CdS NRs (0.10 %), and 2.07 times high as that of FTO-CdS/g-C 3 N 4 (0.15 %). The generation of heterostructure with interfacial interaction reduces the recombination of photogenerated electron-hole pairs, to enhance the charge transfer of water oxidation kinetics, allowing electrons to quickly transfer through the external circuit to the counter electrode for H + reduction to produce H 2 . A schematic diagram of the photoelectrochemical water splitting hydrogen evolution process with the heterojunction CdS/g-C 3 N 4 /Q[7]-10 is systematically proposed.
研究领域:
材料科学
·
能源转换
·
光电化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2021
·
IF 3.927
Xing-Liang Yin,Lei-Lei Li,Yao Lu,Shu-Rui Han,Jian-Min Dou,Da-Cheng Li
A novel pomegranate-like Zn x Cd 1-x S@MoS 2 core@shell nano-heterostructure was synthesized by using a facile one-pot solvothermal approach. In this architecture, the MoS 2 nanosheet and well-dispersed Zn x Cd 1-x S nanospheres serve as peel and seeds, respectively. While maintaining the advantages of nanoscale materials, such as high ratio of surface to volume and a relatively short charge transportation path, this unique structure also provides some additional positive features for H 2 generation application: (1) the intimate contact of MoS 2 and Zn x Cd 1-x S contributes to the well-defined heterostructure formation and thus enhances H 2 generation efficiency; (2) the MoS 2 nanosheets with amorphous-like structures providing numerous active sites for H 2 generation; (3) the multiple pore nano structure promotes mass transfer and allows the active site through exposure; (4) the coated MoS 2 with superior chemical stability protects Zn x Cd 1-x S from photocorrosion and disaggregation. With those advantages, the Zn x Cd 1-x S@MoS 2 heterostructure exhibits a high photocatalytic H 2 evolution rate of 28.22 mmol g −1 h −1 far exceeding that of pristine Zn x Cd 1-x S by a factor of more than 56 and maintains long term stability with no obvious active deterioration in 24 h performance evaluation. Moreover, the one-pot synthesis of this heterostructure significantly saves time and energy, rendering it cost-efficiency. The demonstrated strategy here could have great significance in the design and fabrication of the low-cost and high-efficient heterogeneous photocatalysts .
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
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
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2020
·
IF 3.421
Shiwei Ma,Shiyi Chen,Huijun Ge,Tao Song,Ping Lu,Wenguo Xiang
CeO2 is a typical fluorite oxide with desirable lattice oxygen conductivity and can be applied as an active support for the Fe-based oxygen carrier in chemical looping hydrogen generation (CLHG). However, Fe2O3/CeO2 always suffers from low thermal stability and sintering. Doping foreign cations could be a proper way to improve its reactivity and cyclic stability. In this work, Zr4+ and Sm3+, with a smaller ionic radius and lower valence than Ce4+, respectively, were doped into Fe2O3/CeO2 using the co-precipitation method, and the doping effects on the reactivity and redox stability of Fe2O3/CeO2 in CLHG were investigated. Fe2O3/Ce0.6Sm0.15Zr0.25O1.925 provided the best redox reactivity, and the purity of generated hydrogen for all oxygen carriers reached nearly 100% (the detection limit of CO/CO2 was 0.01% in volume). The reactivity followed the sequence Fe2O3/Ce0.6Sm0.15Zr0.25O1.925 > Fe2O3/Ce0.8Sm0.2O1.9 > Fe2O3/Ce0.75Zr0.25O2 > Fe2O3/CeO2. However, the concentration of oxygen vacancy was ranked as Fe2O3/Ce0.8Sm0.2O1.9 > Fe2O3/Ce0.6Sm0.15Zr0.25O1.925 > Fe2O3/Ce0.75Zr0.25O2 > Fe2O3/CeO2. The Zr doping boosted the reactivity of Fe2O3/CeO2 mainly by enhancing its sintering resistance, whereas the Sm doping achieved it mainly by promoting the oxygen conductivity, whose ability to improve the thermal stability of Fe2O3/CeO2 was rather limited. Both Zr and Sm doping could suppress the outward migration of Fe cations in the particles, resulting in higher sintering resistance. Furthermore, Zr and Sm could dissolve into CeO2 for prepared Fe2O3/Ce0.6Sm0.15Zr0.25O1.925; however, the bleeding out of both dopants was observed with Sm0.5Zr0.5O1.75 formation, which could be detrimental to the redox stability of the oxygen carrier.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）