Energy Reports
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2020
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IF 3.595
Mingxing Zhao,Ziyi Liu,Jin Xu,He Liu,Xiaohu Dai,Sai Gu,Wenquan Ruan
The effect of nano zero valent iron (NZVI) on hydrogen production by the co-digestion of dry lake algae and food waste was investigated. The results showed that 10 mg.gTS −1 addition of NZVI improved the performance of the co-digestion system, with the cumulative hydrogen increased by 29.20% to 40.04 mL.gVS −1 , compared to that of the control. However, the cumulative hydrogen yield decreased to 14.77 and 5.37 mL.gVS −1 when the NZVI dosage was increased to 20 and 40 mg.gTS −1 , respectively. The oxidation reduction potential (ORP) of the reaction system was decreased dramatically to -331 ∼ -490 mV at the initial reaction stage. The degradation rates of carbohydrate and protein also reached their peaks at the NZVI dosage of 10 mg.gTS −1 . The concentration of end product in the liquid phase and the dehydrogenase activity was first increased then decreased when enhancing the NZVI dosage. Analysis of the transmission electron microscopy images revealed that excessive NZVI dosage could destroy the cells of microorganisms.
研究领域:
环境生物学
·
微生物学
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DOI
高影响因子
Materials
·
2021
·Vol. 14
·期 24
·7889
·
IF 3.623
Lixiang Zhu,Meishuai Zou,Xiaodong Zhang,Lichen Zhang,Xiaoxuan Wang,Tinglu Song,Shuo Wang,Xiaodong Li
The main problem for the application of hydrogen generated via hydrolysis of metal alloys is the low hydrogen generation rate (HGR). In this paper, active Al alloys were prepared using a new coupled method-melting-mechanical crushing-mechanical ball milling method to enhance the HGR at room temperature. This method contains three steps, including the melting of Al, Ga, In, and Sn ingots with low melting alloy blocks and casting into plates, then crushing alloy plate into powders and ball milling with chloride salts such as NiCl2and CoCl2were added during the ball milling process. The microstructure and phase compositions of Al alloys and reaction products were investigated via X-ray diffraction and scanning electron microscopy with energy dispersed X-ray spectroscopy. The low-melting-point Ga-In -Sn (GIS) phases contain a large amount of Al can act as a transmission medium for Al, which improves the diffusion of Al to Al/H2O reaction sites. Finer GIS phases after ball milling can further enhance the diffusion of Al and thus enhance the activity of Al alloy. The hydrogen generation performance through hydrolysis of water with Al at room temperature was investigated. The results show that the H2generation performance of the Al-low-melting point alloy composite powder is significantly higher than the results reported to date. The highest H2generation rate and H2conversion efficiency can reach 5337 mL·min−1·g−1for the hydrolysis of water with 1 g active alloy.Keywords:aluminum alloys;melting-crushing-ball milling;hydrogen generation performance;hydrogen storage
研究领域:
材料科学
·
能源工程
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
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IF 4.229
Enzhou Liu,Chenyang Jin,Chenhui Xu,Jun Fan,Xiaoyun Hu
Transition metal phosphides are considered as the most prospective replacements for noble metal cocatalysts used for H 2 evolution during photocatalytic water splitting. In this work, Ni 2 P/g-C 3 N 4 composite photocatalyst was synthesized using a simple in-situ hydrothermal method by one step. Benefiting from the excellent light trapping, efficient transfer of charge carriers and strong stability of Ni 2 P nanoparticles , as well as the stable interface contact between Ni 2 P and g-C 3 N 4 , the Ni 2 P/g-C 3 N 4 exhibit greatly enhanced H 2 evolution performance during photocatalytic water splitting . The optimized H 2 evolution rate can reach 3344 μmol h −1 g −1 over 17.5 wt% Ni 2 P/g-C 3 N 4 , which is 68.2 times greater than that of pure g-C 3 N 4 and even much greater than that of 15 wt% Pt/g-C 3 N 4 . The apparent quantum efficiency (QE) is about 9.1% under 420 nm monochromatic. The enhancement mechanism was demonstrated in detail by transient photocurrent responses, photoluminescence spectra and electrochemical impedance spectroscopy . This work develops a facile strategy to fabricate transition metal phosphide/semiconductor heterojunction systems with potential application for photocatalytic H 2 evolution.
研究领域:
材料科学
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能源化学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Minfeng Zheng,Xiaowei Xing,Yeke Zhang,Zenan Li,Ting Yang,Yuqing Liu,Zhenhui Kang
Recent progress in the co-spinning of nanofibers and semiconductor particles offers a promising strategy for the development of photocatalytic devices, solving aggregation and catalyst recovery challenges. However, composite photocatalysts based on nanofiber membranes often suffer from poor conductivity, low hydrophilicity, and easy recombination of photogenerated electron-hole pairs in the semiconductor components. Here, to tackle the aforementioned issues of ZnIn 2 S 4 /polyacrylonitrile (ZIS/PAN) nanofiber-based catalysts, we prepared a composite carbon dots/ZnIn 2 S 4 /polyacrylonitrile (CZP) nanofiber membrane by blending carbon dots (CDs) with ZIS/PAN using the electrospinning process. The hydrogen evolution performance of the CZP photocatalyst was significantly improved by CDs, which enhanced the hydrophilicity, increased the light absorption, facilitated the transfer of photogenerated electrons, and reduced the recombination of photogenerated electron-hole pairs. Notably, the optimal CZP photocatalyst achieved a hydrogen evolution rate of 2250 μmol g -1 h −1 , which is about 23 % higher than that of the nanofiber membrane without CDs and 4.55 times higher than that of ZIS particles. The present work successfully improved the CZP nanofiber membrane of photocatalytic hydrogen evolution performance, and the membrane may benefit further device development by eliminating the need for stirring and simplifying the recovery process.
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
PubMed
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
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2022
·Vol. 39
·期 6
·928-932
·
IF 2.726
Xu Zhonghang,Wu Yuanyu,Tao Ran,Jin Zhanbin,Fang Xuedong
I n recent years, many effective photocatalysts have been developed to solve the problem of environmental pollution and clean energy shortage. In this paper, non-noble metal cocatalyst Ni 3 N nanoparticles supported Zn 0.5 Cd 0.5 S(ZCS) nanorods(Ni 3 N/ZCS) composites were successfully synthesized by ultrasonic method. The hydrogen production efficiencies of the photocatalysts were tested under visible light, which was found that when the loading of Ni 3 N was 2% of the mass of ZCS, and the Ni 3 N/ZCS composite had the best hydrogen evolution performance, which could reach 70.3 mmol·h −1 ·g −1 . In addition, the quantum efficiency under 420 nm monochromatic light irradiation was 27.2%. Through different characterization analyses, such as X-ray diffraction(XRD), scanning electron microscopy(SEM), and UV-Vis diffuse reflectance spectra(DRS), a possible photocatalytic mechanism was proposed, providing some reference value for non-precious metals as cocatalysts.
研究领域:
材料科学
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环境科学
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能源科学
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产品关联
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2024
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IF 4.3
Jing-Xiao Li,Yu-Long Xie,Shang-Mei Yang
Bimetallic AgCo/g-C 3 N 4 photocatalysts were successfully prepared by a facile chemical reduction method and used to investigate their photocatalytic H 2 production performance. Bimetallic AgCo as a cocatalyst can be well matched with g-C 3 N 4 , which is beneficial for increasing the number of active reaction sites and narrowing the band gap. A possible photocatalytic mechanism was explored by XRD , FTIR, SEM, TEM, UV–vis DRS , BET, and PL characterization. The photocatalytic H 2 production activity of the optimal 5%AgCo/g-C 3 N 4 photocatalyst reached 12994.2 μmoL/g, which was 54.7 times higher than g-C 3 N 4 . Owing to the close interfacial contact between bimetallic AgCo and g-C 3 N 4 , the transfer distance was shortened, and the photogenerated electron and hole pairs were effectively separated. This study provides a new strategy for the synthesis of excellent H 2 production photocatalysts using bimetallic nanoparticles .
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
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Yaoyao Liu,Chunmei Zeng,Lunhong Ai,Jing Jiang
Cadmium sulfide (CdS) has been currently emerged as a promising class of photocatalyst candidates toward hydrogen evolution from water photosplitting because of its unique electronic structure and favorable optical property . However, pure CdS often suffers from the poor stability and fast charge carrier recombination. Cocatalyst engineering is an effective strategy to activate photocatalytic performance of CdS but remains a challenge. Herein, we develop an effective hydrothermal method to construct microwave-derived CdS nanocrystals hybridized with MoS 2 nanosheets . Such hybrids bear the nanocrystal-on-nanosheet heterostructures , ensuring the intimate interfacial contact and increased charge transfer kinetics. The resulting CdS/MoS 2 hybrids exhibit highly efficient photoreactivity and excellent photostability for hydrogen evolution under visible light irradiation. The hydrogen generation rate achieved by the optimal CdS/MoS 2 is approximately 286 times higher than that of pure CdS. This remarkably boosted performance could be ascribed to synergistically interfacial effect that brings an energy-beneficial driving force to realize the highly efficient transfer, migration, and separation of photoexcited charge carriers.
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
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Wenjuan Fan,Hui Chang,Wenju Pang,Yufeng Li,Chuanhai Xiao,Yan Jiang,Zhiqiang Jiang,Guangfu Yin
Designing photocatalysts with excellent morphology from MOF is a promising strategy to improve photocatalytic H 2 evolution. Herein, a three-dimensional (3D) honeycomb-like Zn 0.5 Cd 0.5 S -140 assembled by ultra-thin nanosheets with an average thickness of about 1.5 nm was constructed using a novel 3D metal–organic framework (namely PZH-139) as template. Notably, the micromorphology could be tuned and the balance between conduction band (CB) position and band gap could achieve by adjusting the Zn/Cd molar ratio of Zn x Cd 1-x S. In a series of Zn x Cd 1-x S -140 photocatalysts derived from MOF, Zn 0.5 Cd 0.5 S -140 exhibited the highest hydrogen evolution rate (26.32 mmol h −1 g −1 ) by visible-light-driven with an apparent quantum efficiency (AQE) of 29.92 %, which was 6, 11 and 23 times higher than that of I-Zn 0.5 Cd 0.5 S (irregular morphology Zn 0.5 Cd 0.5 S), S-Zn 0.5 Cd 0.5 S (spherical Zn 0.5 Cd 0.5 S) and B-Zn 0.5 Cd 0.5 S (bulk Zn 0.5 Cd 0.5 S) prepared by traditional non-MOFs derived-methods, respectively. The excellent photocatalytic performance could be attributed to the synergism of the larger specific surface area, the balance between CB position and band gap, rapid carriers transfer and the enhanced light absorption capability. More importantly, this rare strategy for constructing highly efficient ultra-thin nanosheet assembled 3D honeycomb-like Zn 0.5 Cd 0.5 S -140 derived from MOF can flourish the design ideas of photocatalysts with specific excellent morphology.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
Molecular Catalysis
·
2023
·
IF 4.6
Qiaona Liu,Xin Han,An Qian,Xin Pu,Lei Ye,Pengpeng Liu,Fengqi Zhang,Jichang Liu
Developing noble-metal-free dual-metal single-atom catalysts with rich active accessible sites and excellent catalytic activity is very meaningful and challenging, especially for photocatalytic hydrogen production reaction, which can significantly reduce the cost of photocatalytic technology application while reducing the use of noble metals. Herein, a novel noble-metal-free dual CuNi single-atom modified ZnIn 2 S 4 (CuNi SA -ZIS) photocatalyst with high hydrogen production performance were successfully prepared by a hydrothermal method. The ZnIn 2 S 4 with a spherical nanoflower structure is composed of ultrathin nanosheets, and AC HDDAF-STEM results shows that CuNi bimetallic particles are uniformly distributed on the surface of ZnIn 2 S 4 nanosheets and exhibit atomic level dispersion, forming dual-metal single-atom structure. The optimized 1 wt% CuNi SA -ZIS photocatalyst with the Cu/Ni ratio of 1:1 shows the optimum H 2 evolution performance with a rate of up to 7844.7 μmol· g −1 · h −1 using triethanolamine as a sacrificial reagent, which is significantly improved compared to pristine ZIS, Cu-ZIS and Ni-ZIS samples under simulated sunlight. Electrochemical and spectroscopic characterization results demonstrated that the improved photocatalytic activity of CuNi SA -ZIS was mainly due to the addition of the dual CuNi single atoms with a synergistic effect served as a co-catalyst for ZnIn 2 S 4 photocatalysts, providing efficient active sites for hydrogen evolution while preventing the fast recombination of photo-generated electrons and holes. This study provides a valuable source of ideas for the design of effective noble-metal-free dual-metal single-atom catalysts.
研究领域:
材料科学
·
催化化学
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产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
MingCheng Yang,Chuan Lai,ChunTan Chen,Ying Li,Lu Chen
Fabricating type-II heterostructures to accelerate the charge separation of the photocatalysts has been considered as a prospective strategy to improve the photocatalytic performance. Herein, a novel type-II photocatalytic heterojunction was fabricated by integrating Cu 3 P on nanosheet CdIn 2 S 4 to accelerate carrier separation, enhancing the RhB degradation and H 2 evolution performance. The Cu 3 P/CIS composite achieved complete RhB degradation within 40 min and an impressive 95 % photodegradation efficiency for RhB. Quenching experiments and electron spin resonance (ESR) measurements confirmed that the ·O 2 – plays an important role in the degradation of RhB. Meanwhile, the optimal Cu 3 P/CdIn 2 S 4 photocatalyst shows a high hydrogen evolution rate of 1058 umol ·g −1 ·h −1 , which was 7 and 1.8 times higher than that of pure CIS. The outstanding photocatalytic performance was ascribed to the robust built-in electric field at the interface between two components driving force for electron migration.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Zhen Qin,Hang Sun,Yanan Tang,Zhiyong Chang,Shengyan Yin,Zhenning Liu
Inspired by the characteristics that plant leaves are beneficial for solar light absorption, we have prepared a bio-inspired hierarchical assembly of carbonized spinach leaves@Au/ZnO (CS@Au/ZnO) for solar energy utilization. CS@Au/ZnO shows a low light reflectance of 5% and a high specific surface area of 311.41 m 2 /g. CS@Au/ZnO demonstrates higher photocatalytic degradation efficiency: more than 97% of Rhodamine B (RhB) and 61% of ciprofloxacin (CIP) could be degraded in 180 min under the visible light irradiation. In addition, we also tested the photocatalytic H 2 production performance of CS@Au/ZnO and the H 2 evolution rate is 2.384 mmol g −1 h −1 under simulated solar light. CS@Au/ZnO shows a high cycling stability in recyclable photocatalytic degradation and photocatalytic water splitting. Moreover, CS@Au/ZnO shows a swift and steady photocurrent of about 63.6 μA/cm 2 , illustrating a high sensitivity to solar light. The enhanced photocatalysis performance of CS@Au/ZnO could be ascribed to the naturally optimized macroporous structure of CS with high conductivity, which could enhance the light harvesting and carrier transport, simultaneously. Moreover, modification of AuNPs can broaden the light response range of ZnONRs and reduce the probability of electron-hole recombination. Due to the wide availability of plant leaves, CS@Au/ZnO assembly has broad application prospects in photocatalytic degradation of organic pollutions, photovoltaic devices , and photocatalytic H 2 evolution.
研究领域:
材料科学
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环境科学
·
纳米技术
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Chenmei Gao,Yu Xie,Yong Chen,Yun Ling,Yongcun Ma,Yifan Zhang,Yi Shao
One of the major challenges in photocatalytic hydrogen production is to improve the separation efficiency of photo-generated carriers. Therefore, we prepared ZIS/BMO heterojunctions by hydrothermal method to promote the directional separation of photogenerated carriers. A series of characterization results show that the successful preparation of heterojunctions substantially increases the separation and transfer rate of photogenerated carriers. 11% ZIS/BMO had the highest photocatalytic hydrogen production performance reached 1502.6 μmol/g/h, which is 2.78 times than ZIS monomer . Simple construction of heterojunctions but dramatic improvement of photocatalytic hydrogen production performance opens up new horizons for photocatalyst modification.
研究领域:
材料科学
·
能源科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）