INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
·
IF 4.084
Lizi Chu,Yuan Lin,Yunpeng Liu,Hongjuan Wang,Qiao Zhang,Yuhang Li,Yonghai Cao,Hao Yu,Feng Peng
A facile method of loading CoS x nanosheet onto CdS nanorod has been designed, and the prepared CdS-CoS x composite catalyst exhibited significantly improved performance for photocatalytic hydrogen evolution compared with CdS catalyst. This composite catalyst was also used as a photoanode for photoelectrochemical (PEC) hydrogen production . The hydrogen production rate reached 168.6 μmol cm −2 h −1 (37.77 L m −2 h −1 ) under the simulated solar light, which is 2.7 times that of CdS and the same as that of CdS–Pt. In addition, in the Na 2 S–Na 2 SO 3 system for PEC hydrogen production, an abnormal relationship between photocurrent and the hydrogen production yield was found. By designing a series of experiments, the photocatalytic and photoelectrochemical characteristics for hydrogen production were reasonably revealed for the first time. In this work, the prepared structured catalyst is easy to be recycled, and CoS x can replace precious metal Pt, showing a promising application.
研究领域:
材料科学
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能源科学
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环境科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Fengyu Tian,Wenhong Wang,Bin Liu,Yuan Pan,Bin Dong,Yichuan Li,Yanpeng Li,Hailing Guo,Yongming Chai,Chenguang Liu
The future implementation of ultralow sulfur fuel regulations requires researchers to have an excellent understanding of the mechanism of the synergistic effect between the Co(Ni) and (Mo)W sulfides in supported Co(Ni)Mo(W)S hydrodesulfurization (HDS) catalysts. This synergistic effect occurs when the distance between two metals is on the mm or nm scale. To investigate the promotion of HDS on the µm scale, a series of Co and Mo multilayer flake catalysts with a thickness of 1 mm were prepared by laminate molding. The distance between CoS x and MoS 2 in these specially structured catalysts was adjustable on the µm scale by controlling the order and quality of the catalyst powder. The results for the HDS of dibenzothiophene (DBT) demonstrate that there is an obvious synergistic effect between CoS x and MoS 2 on the µm scale. The results of pyridine IR spectroscopy indicate that this synergy is due to CoS x and MoS 2 synergistically generating more coordinatively unsaturated sites (CUSs) and -SH active sites at the μm scale, thus increasing the HDS activity. Moreover, the catalyst activity increases as the distance between CoS x and MoS 2 decreases, and the fact that the feed comes into contact with CoS x first greatly improves the activity.
研究领域:
催化化学
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能源材料科学
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产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
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2021
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IF 2.328
Xinyu Liu,Jing Xu,Lijun Ma,Ye Liu,Linying Hu
The research work of photocatalytic decomposition of water to produce hydrogen is wider and wider. A highly efficient composites photocatalyst was prepared by hydrothermal method. The composite photocatalyst was composed of spherical CoS x and layered nanosheets of MgAl-LDH. The composite photocatalyst retained the advantage of a wide range of visible light absorption, and can effectively prevent the photocorrosion phenomenon caused by sulfide. The hydrogen production of composite photocatalyst was 262.5 μmol. Compared with MgAl-LDH and CoS x , there was a significant improvement. The combination of the two accelerated the separation of photogenerated electrons and holes, which made the hydrogen production effect of the composite catalyst obvious. To investigate the stability of the composite catalyst, a cycle test was carried out and it showed good stability during the test. According to PL, XPS, XRD, TEM, SEM, UV–Vis DRS and electrochemical characterization, the possible reaction mechanism was proposed. A high performance photocatalyst for hydrogen production with low cost MgAl-LDH combined with CoS x had been explored, which provided a convenient way for research work.
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
Science China-Materials
·
2023
·Vol. 66
·期 4
·1383-1388
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IF 8.1
Cheng Changgen,Ao Weidong,Ren Huijun,Fan Zhishuai,Xu Tingting,Dai Lei,Yin Peiqun
In this work, we have successfully constructed carbon nanotube (CNT)-a-CoS x amorphous heterostructured catalysts using a two-step method. The abundant active sites, superior electron transport properties, and large electrochemically active specific surface area enable amorphous CNT-a-CoS x to exhibit higher hydrogen evolution reaction performance than crystalline CNT-c-CoS x in acidic conditions. To deliver a cathodic current density of 10 mA cm −2 , the required overpotential is only 76 mV. No significant performance degradation is observed after 60,000 s of electrochemical durability test. This facile strategy provides technical support for the design and construction of amorphous heterostructured electrocatalysts with high activity and stability for the generation of green hydrogen.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
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2025
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IF 5.5
Fujuan Luo,Yisong Wang,Lei Han,Kai Tao
Layered double hydroxides (LDHs) represent an important class of battery-type electrode materials for supercapacitors (SCs), but they suffer from serious agglomeration and low electronic conductivity. In this paper, amorphous/crystalline CoSx/NiCo LDH heterogeneous nanosheet arrays have been constructed via partial sulfurization of zeolitic imidazolate framework-L (ZIF-L) template followed by etching with nickel nitrate. The amorphous CoSx not only provides rich active sites but also acts as a scaffold for anchoring NiCo LDH, preventing its aggregation. The hollow cavity facilitates charge transport and relieves volume expansion during electrochemical process. Besides, the binder-free configuration reduces contact resistance and “dead volume”. With these merits, CoSx/NiCo LDH displays a high specific capacitance of 1903.8 F g–1 at 1 A g–1 with an excellent rate performance (76.1% at 10 A g–1). In addition, the two-electrode cell assembled from CoSx/NiCo LDH and activated carbon (AC) outputs an energy density of up to 54.66 W h kg–1 corresponding to a power density of 800 W kg–1 at 1 A g–1 along with satisfactory cycle life (82% after 10,000 cycles at 10 A g–1).
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Lixiang Zhang,Pan Li,Luping Feng,Xi Chen,Jiatian Jiang,Sheng Zhang,Anchao Zhang,Guofu Chen,Hua Wang
Visible-light-driven and ultra-stable CoS x /CdS photocatalysts were controllably fabricated by the ZIF-67-templated one-pot solvothermal route for highly efficient photocatalytic Cr(VI) reduction. It was discovered that the resulting CoS x /CdS composites could present different photocatalytic activities controllably depending on the CoS x -to-CdS molar ratios used. The one with 1/16 M ratio could display the highest photocatalytic reduction performance for Cr(VI) with the efficiency up to 100% within 30 min, which is 5.6-fold and 2.1-fold higher than that of pristine CoS x and CdS, respectively. Herein, the components of CoS x and CdS with well-matched energy-band structures might serve separately as the electrons donor and the holes quencher to prolong the lifetime of photogenerated electrons in CoS x /CdS composites. A direct Z-scheme heterojunction could be thus constructed for promoting the charge carrier transferring with the improved redox abilities, leading to the robust photocatalysis of CoS x /CdS photocatalyst. Moreover, the developed CoS x /CdS photocatalyst could present superior stability with the structure and activity well survived after five photocatalytic cycles. This work may pave the way towards the controllable construction of a direct Z-scheme photocatalytic system by synergistically combining two kinds of components with matched energy-band structures, achieving the enhanced photocatalysis for the wide applications in the environmental remediation field.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2019
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IF 7.467
Yudi Niu,Xing Qian,Jiahao Zhuang,Hongyu Liu,Linxi Hou
Owing to the modifiable compositions and morphologies, high-efficiency clean energy catalysts with complex functional structures attract wide-ranging attention. Herein, this report focuses on the controllably morphological MoS 2 -doped NiS 2 /Co 3 S 4 nanocubes which are derived from nickel-cobalt Prussian-blue analogs. After annealing in N 2 flow, MoS 2 /Ni-CoS x porous nanocubes are prepared via regulating the reactant ratios (1/2, 1/1 and 2/1) between (NH 4 ) 2 MoS 4 and Ni–Co Prussian-blue analogs. In the synthesis progress, (NH 4 ) 2 MoS 4 is applied as a bifunctional dopant source, which can expediently offer Mo and S elements simultaneously. The quaternary porous MoS 2 /Ni-CoS x (1/1) with the reasonable chemical composition, considerable specific surface area (86.7 m 2 g −1 ) and excellent electrocatalytic property can be selected as the representative counter electrode catalyst in dye-sensitized solar cells. Furthermore, the solar cell with MoS 2 /Ni-CoS x (1/1) exhibits a higher power conversion efficiency (9.80%) than that of Pt (8.19%) under a standard irradiation.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Xiaohui Guan,Mohan Huang,Liu Yang,Guangsheng Wang,Xin Guan
In this paper, two-component nanocages containing CoS x and nickel-cobalt layered double hydroxides (Ni-Co LDH) were facilely synthesized via a multistep transformation approach. The zeolitic imidazolate framework-67 (ZIF-67) nanocrystals were firstly synthesized, and then after partial sulfuration, the CoS x /Ni-Co LDH nanocages were achieved by adding nickel ions for etching and precipitation. The prepared CoS x /Ni-Co LDH nanocages consisted of the hollow rhombic dodecahedral morphology with many nanosheets arrays on the shell. When used as electrode materials for electrochemical capacitors, this CoS x /Ni-Co LDH nanocages deliver a specific capacitance of 1562 F g −1 at a current density of 1 A g −1 . In addition, an asymmetric supercapacitor assembled with CoS x /Ni-Co LDH as cathode and active carbon (AC) as anode shows a high energy density of 35.8 Wh kg −1 at a power density of 800 W kg −1 and has an excellent cycling performance with the retention rate of 94.56% after 10,000 cycles, suggesting their potential application in high-performance electrochemical capacitors. These exceptional electrochemical properties can be attributed to the unique structure and synergistic effects between the metal sulfide and the bimetallic hydroxide, which also indicate the potential application of CoS x /Ni-Co LDH nanocages in high-performance supercapacitors.
研究领域:
材料科学
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电化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Can Wang,Li Zhang,Guancheng Xu,Lifan Yang,Jinhui Yang
Developing non-noble and high activity electrocatalysts is the key to electrocatalytic water-splitting. Recently, MoS 2 shows vast perspectives due to its excellent catalytic performance and chemical stability in acid condition. Herein, to expand its application in different environment, a unique ternary composite MCNTs@CoS x @MoS 2 comprising three-dimensional lamellar heterostructure supported by multiwalled carbon nanotubes was successfully prepared by a two-step solvothermal strategy and used in electrocatalytic field. As a bifunctional electrocatalyst, heterostructure MCNTs@CoS x @MoS 2 could catalyst HER with a small overpotential of 196 mV and low Tafel slope of 65 mV dec −1 in acid condition and exhibit outstanding OER performance with a low overpotential of 285 mV and small Tafel slope of 76 mV dec −1 in alkaline solution. Meanwhile, it displayed excellent durability both in an acid and alkaline solution. The remarkable electrochemical performance of MCNTs@CoS x @MoS 2 can be attributed to novel construction advantages and synergy of MCNTs, small CoS x nanoparticles and lamellar MoS 2 . This work can be extended to the design and preparation of a series of composite materials with the advantage of structural diversity.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Lixiang Zhang,Luping Feng,Pan Li,Xi Chen,Jiatian Jiang,Sheng Zhang,Chunxian Zhang,Anchao Zhang,Guofu Chen,Hua Wang
A visible-light-driven photoelectrochemical (PEC) sensor has been developed for probing Hg 2+ with “turn-on” signal output using hollow CoS x @CdS polyhedron as direct Z-scheme photocatalyst and Hg 2+ -recognition probe. The CoS x @CdS heterojunction photocatalysts were fabricated by growing CdS nanoparticles on the surface of cobalt sulfide (CoS x ) via one-pot solvothermal route using metal-organic frameworks (MOFs) of ZIF-67 polyhedrons as the sacrificial templates and cobalt precursors. It was discovered that the photocurrent responses of the CoS x @CdS-modified ITO electrodes could be specifically turned on by Hg 2+ , in contrast to these of the CoS x or CdS-modified ones showing no significant Hg 2+ -induced photocurrent. Under visible light irradiation, herein, the synergetic combination of CoS x and CdS components could improve the carriers transferring of PEC system. More importantly, the photocurrents of the PEC sensor could be greatly enhanced in the presence of Hg 2+ through the selective ion-exchange reaction to trigger the in-situ formation of a new Z-scheme heterojunction of CoS x @CdS/HgS photocatalysts, achieving the further promoted charge transferring and suppressed recombination of photogenerated electron-hole pairs. The developed double heterojunctions-based PEC sensors can detect Hg 2+ with the concentrations ranging from 0.010 to 1000 nM, which performances are much better than those of the current PEC analysis methods. Besides, such a MOF-templated one-pot construction route may pave the way toward the design of various direct Z-scheme heterojunction photocatalysts of PEC probes of great interest.
研究领域:
材料科学
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环境科学
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分析化学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
·
IF 7.2
Puhui Deng,Chuanjun Xi,Ning Chen,Hongpeng Shi,Linping Zhang,Yu Hou
Loading co-catalysts are an effective strategy to break the confinement of bulk carbon nitride in photocatalysis . Employing this strategy, N-doped g-C 3 N 4 decorated with CoS x was successfully prepared through a photochemical synthesis route. The optimum hydrogen evolution performance of N-CN-CoS x -4 was 1757 μmol g −1 h −1 under visible light irradiation . Superior interfacial carrier transfer properties and improved light absorption of N-CN-CoS x -4 could elucidate its better photocatalytic activity . This research offers a reference for the construction of high-efficiency, stable and low-priced photocatalysts .
研究领域:
材料科学
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光化学
·
催化
·
可再生能源
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 34
·16171-16183
·
IF 3.553
Liu Shengjun,Zou Qichao,Ma Yan,Sun Wen,Li Yu,Zhang Jian,Zhang Cheng,He Lifang,Sun Yudie,Chen Qian,Liu Bo,Zhang Hexin,Zhang Kui
Metal–organic frameworks (MOFs) are a new type of porous crystal materials that have been widely used in various fields. Owing to their adjustable porous structure, MOF photocatalysts with high catalytic activity have become a research hotspot. In this study, NH 2 -MIL-125/CoS x samples were investigated as a novel visible light-responsive catalyst for the removal of organic dye. The NH 2 -MIL-125/CoS x -20 composites showed the best photodegradation efficiency, where photodegradation of the rhodamine B reached 95.4% in 45 min. CoS x was able to effectively extend the wavelength absorption range of NH 2 -MIL-125 and effectively separate the photogenerated electrons and holes and that could lead to the improved photocatalytic performance of the composites. The reactive superoxide radical ( · O 2− ) was identified as the main active species using reactive species capture experiments, and a reasonable photocatalytic mechanism was proposed. This paper is intended to guide the development of organic–inorganic hybrid materials for environmental remediation.
研究领域:
材料科学
·
环境科学
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化学
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）