BIOMASS & BIOENERGY
·
2022
·
IF 5.774
Guojun Hao,Hongying Liu,Zhibing Chang,Kechen Song,Xin Yang,Han Ma,Wenjing Wang
In this work, lignin depolymerization was examined over CoMo sulfide catalysts supported on different carriers in supercritical ethanol system. The temperature, time, MoS 2 and carrier effects on the lignin depolymerization were investigated. 95.76% liquefaction yield with negligible char was achieved over Co–Mo–S/ZrO 2 at 340 °C for 150 min. The liquid product was mainly composed of C 4 –C 8 alcohols, C 4 –C 10 esters and C 7 –C 10 aromatic compounds . The synergistic effect of active sites and acid-base sites on support played an important role in lignin depolymerization. Furthermore, the Co–Mo–S/ZrO 2 catalyst is reusable with 8% loss in liquefaction yield after 5 cyclic runs. We believe that acid/base carriers or additives that can promote the medium to generate abundant free radicals or ions to replace external hydrogen pressure are one of the prospects for the design of depolymerization lignin catalysts.
研究领域:
化学工程
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Zheng-Xue Wu,Le-Qing Fan,Jiao-Juan Chen,Xu-Geng Deng,Tao Tang,Yun-Fang Huang,Ji-Huai Wu
Ternary metal sulfides employed in supercapacitors exhibit better electrochemical performances than their counterpart oxides due to their superior conductivity. However, the insertion/extraction of electrolyte ions can lead to a significant volume change in electrode materials , which can result in poor cycling stability. Herein, novel amorphous Co-Mo-S nanospheres were fabricated through a facile room-temperature vulcanization method. It involves the conversion of crystalline CoMoO 4 by reacting it with Na 2 S at room temperature . In addition to the conversion of the crystalline state into an amorphous structure with more grain boundaries, which is beneficial for the transport of electron/ion and can accommodate the volume change generated by the insertion/extraction of electrolyte ions, the production of more pores led to an increased specific surface area. The electrochemical results indicate that the as-prepared amorphous Co-Mo-S nanospheres had a specific capacitance of up to 2049.7F/g@1 A/g together with good rate capability. The amorphous Co-Mo-S nanospheres can be used as the cathode of supercapacitors and assembled with an activated carbon anode into an asymmetric supercapacitor possessing a satisfactory energy density of 47.6 Wh kg −1 @1012.9 W kg −1 . One of the prominent features exhibited by this asymmetric device is its remarkable cyclic stability, with a capacitance retention of 107% after 10,000 cycles.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Wenxue Zhao,Aihua Yan,Zigao Su,Fei Huang,Jixu Zhang,Ye Gao,Huaqi Yuan,Bolei Hui,Heng Wang
ZnIn 2 S 4 is a promising and typical semiconductor for photocatalytic water splitting into hydrogen production. However, the low charge-carrier utilization restricts its hydrogen evolution performance and practical application. In this work, a synergistic strategy of sulfur vacancy (S v ), internal electric field (IEF) and Mo-S bond was utilized for improving the charge-carrier utilization of MoS 2 /S v -MnS/ZnIn 2 S 4 composites. In particular, Z-scheme S v -MnS/ZnIn 2 S 4 heterojunction not only tackled the charge-carrier recombination problem but also improved the redox capability. Meanwhile, Schottky-type MoS 2 /S v -MnS contact further promoted the charge transfer through Mo-S bond “bridge”, accelerated the surface hydrogen reduction reaction kinetics, and thus boosted the charge-carrier utilization. As a result, the optimal MoS 2 /S v -MnS/ZnIn 2 S 4 catalysts could expeditiously produce 1.75 mL of hydrogen production within 3 h, and achieve a photocatalytic hydrogen evolution rate of 13.02 mmol g -1 h -1 . This work provides an ingenious method to synthesize ZnIn 2 S 4 -based photocatalysts with highly-efficient charge-carrier utilization.
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
RSC Advances
·
2023
·Vol. 13
·期 50
·35689-35694
·
IF 3.9
Huandi Hou,Ting Wang,Baohuan Wang,Wenting Guo,Xiang Miao,Xin Liang
Co–Mo–S based catalysts have promising applications in both the hydrogen evolution reaction (HER) and hydrodesulfurization (HDS). Herein, Co–Mo–S catalyst and Co–Mo–S catalyst with and without NaBH4 modification have been successfully synthesized by a simple hydrothermal synthesis method. Co–Mo–S catalysts with NaBH4 modification show better catalytic activity towards both HDS and the HER. The phase purity, morphology, crystal structures and electron valence distribution of the catalysts with and without NaBH4 modification were studied by experimental characterizations and theoretical calculations. The catalysts without NaBH4 modification are mostly 2H-MoS2, while the catalysts without NaBH4 modification have 1T-MoS2, and 1T-MoS2 is exposed to more active sites, which will be conducive to the results of HDS performance of the catalyst. DFT calculations investigated the required activation energies of 1T-MoS2 and 2H-MoS2 for HDS and HER, respectively. The activation energy required for both HDS and H2 generation of 1T-MoS2 is significantly lower than that for the 2H-MoS2 structure.
研究领域:
催化化学
·
材料科学
·
理论计算
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2017
·
IF 4.784
Shoushuai Gao,Yi Zhang,Jianping Ao,Shuping Lin,Zhaojing Zhang,Xiuling Li,Dongxiao Wang,Zhiqiang Zhou,Guozhong Sun,Fangfang Liu,Yun Sun
The direction of Se-Mo-Se sheets to the Mo film is crucial for the thickness of Mo(S,Se) 2 and the electrical conductivity , so as the back contact of Cu 2 ZnSn(S,Se) 4 solar cells. In this study, the preferred orientation of Mo(S,Se) 2 film changes from (100) peak to (103) peak, i.e. from perpendicular to the substrate to tilted to the substrate for Se-Mo-Se sheets as the roughness decrease of Mo back contact layer. The Se vapor can easily diffuse through the channels between Se-Mo-Se sheets when the formed Mo(S,Se) 2 layer is (100) peak preferred with Se-Mo-Se sheets perpendicular to the substrate, and thus excessively thick Mo(S,Se) 2 will be formed. Whereas, the Se-Mo-Se sheets are tilted to substrate when the preferred orientation of Mo(S,Se) 2 is (103) peak. The tilted Se-Mo-Se sheets can act as a natural Se diffusion barrier to suppress the Se vapor diffusion through the already formed Mo(S,Se) 2 layer to further selenize the remaining Mo film, and also can provide a good electrical conductivity. As a result, the thickness of Mo(S,Se) 2 sharply decreased from 1500 nm to 200 nm with the surface morphology change of Mo back contact, which resulting in the decrease of series resistance of Cu 2 ZnSn(S,Se) 4 solar cells from 2.94 Ω cm 2 to 0.49 Ω cm 2 , and the increase of conversion efficiency of Cu 2 ZnSn(S,Se) 4 solar cells from 6.98% to 9.04%.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Sleshi Fentie Tadesse,Dong-Hau Kuo,Worku Lakew Kebede,Girma Sisay Wolde
Developing low-cost and visible-light-driven metal oxide and sulfide-based photocatalysts for the degradation of organic dyes has been a major area of research to mitigate environmental pollution. In this study, a low-cost and facile precipitation method at low temperature of 95 °C was used to synthesize visible-light-driven Nd 2 O 3 /Mo(S,O) 3-x ·0.34H 2 O heterojunctions (NdMoOS). The crystal structure, elemental composition, optical, and electrical properties of as-prepared materials were investigated using various analytical techniques. Organic dyes of methyl orange (MO), Rhodamine B (RhB), and Methylene blue (MB) were selected as model organic pollutants to evaluate the photocatalytic efficiency of as-synthesized materials under visible light irradiation. 20 mol% NdMoOS nanocomposite showed excellent degradation efficiency and it decomposed 98.8%, 99.9%, and 99.8% of MO, RhB, and MB after 120 min, 90 min, and 90 min visible light irradiation, respectively. HPLC-MS analysis further confirms the complete removal of dyes. The formation of heterojunction, high charge separation, and low recombination rate of photoinduced e - -h + pairs can contribute to the enhanced photocatalytic activity. Superoxide radicals (O 2–• ), hydroxyl radicals (HO • ), and holes (h + ) were identified as major oxidative species involved in the photocatalytic degradation mechanisms of MO, RhB, and MB dyes.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Mao Zhou,Ruizhuo Ouyang,Yuhao Li,Yuqing Miao
3D microspheres from the in situ synthesis, growth and organization of Ni-Mo-S nanoparticles (NPs) on porous Ti plate were obtained through a typical hydrothermal method . The Ni-Mo-S/Ti electrode exhibited excellent electrocatalytic performance for hydrogen evolution reaction (HER) in strong acid electrolyte. HER occurs at the relatively low onset potential of −4 mV with high current of 10 mA/cm 2 at low overpotential of 30 mV in 0.5 M H 2 SO 4 . Furthermore, the Ni-Mo-S/Ti exhibited excellent electrocatalytic stability over an extended period of 60000 s without obvious current decrease observed. The multinary composition , 3D microsphere-like structure from nanoparticles, porous supporting substrate, the good conductivity of Ti and good electron transfer between electrode and catalysts, all of them are combined to contribute to the high HER electrocatalytic activity of the Ni-Mo-S/Ti. The good stability comes from the stability of catalysts and Ti themselves, and the tight contact between catalysts and supporting electrode.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Junjie Fu,Afei Zhang,Dongxing Kou,Zewen Xiao,Wenhui Zhou,Zhengji Zhou,Shengjie Yuan,Yafang Qi,Zhi Zheng,Sixin Wu
One important issue limiting the development of Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cells is the severe recombination loss at CZTSSe/Mo(S,Se) 2 /Mo back contact, primarily arising from the non-matched potential barrier and inferior electric contact between absorber and weak n -type Mo(S,Se) 2 interfacial layer. It is expected that a p-type Mo(S,Se) 2 can effectively improve the hole extraction and enhance the device performance. In this work, we propose a plausible direction to build up an electrically benign back surface field by in-situ doping Mo(S,Se) 2 with group VB elements (TM = V, Nb and Ta). It is turned out that the generated V Mo , Nb Mo , or Ta Mo shallow acceptors could convert Mo(S,Se) 2 from weak n -type to p-type conductivity and increase its work function ( W F ) and hole concentration. With the contact of p-type absorber ( W F,absorber < W F,Mo(S,Se)₂ ), a benign ohmic contact with favorable downward band bending is formed, thereby accelerating the holes extraction and minimizing interface recombination loss. With significant gains in open-circuit voltage ( V oc ) and fill factor (FF), the Mo(S,Se) 2 :Ta device finally increases the efficiency from 10.82 % to 12.72 %. This convenient in-situ Mo(S,Se) 2 doping strategy is different from previous complicated or unstable cases and should serve as a basis for high-quality back contact engineering in kesterite photovoltaics.
研究领域:
材料科学
·
光伏技术
·
半导体物理
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Jingting Sun,Shangshang Wang,Xingyu Liu,Huan Yu,Jiaming Li,Chao Liu,Qinfang Zhang,Zhigang Zou
Photocatalytic hydrogen production (PHE) technology has emerged as a sustainable approach to convert solar energy into hydrogen energy, exhibiting significant potential for clean energy applications. In this study, an ultrasonic-assisted method was adopted to fabricate S-scheme MoSe 2 /Mn 0.5 Cd 0.5 S (MoSe 2 /MCS) composites, where intimate heterostructures are formed through interfacial Mo–S bonds between MCS and MoSe 2 . The atomic-level Mo–S bonds establish charge transport pathways and enable directional control of charge transfer. The as-constructed S-scheme MoSe 2 /MCS photocatalysts exhibit two critical advantages: enhanced charge carrier separation rate and improved overall redox capacity. Under visible-light irradiation, the MoSe 2 /MCS composites significantly outperform pure MCS in PHE performance. The optimal 5-MoSe 2 /MCS composite demonstrates the superior PHE activity, achieving an apparent quantum yield value of 71.16 % at 400 nm and remarkable photocatalytic stability. Key characterization techniques, including (solution-based) time-resolved photoluminescence technique, theoretical calculation, photoelectrochemical measurements, were employed to elucidate the positive correlation between ion-carrier interaction and charge separation efficiency, thereby enhancing the PHE performance. Based on experimental analysis and theoretical calculation, a plausible PHE mechanism for the S-scheme MCS composites is revealed and discussed in detail. These findings provide valuable insights for designing high-efficiency S-scheme heterostructured composites with interfacial chemical bonds.
研究领域:
材料科学
·
物理化学
·
纳米催化
·
能源材料
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 52
·期 8
·5422-5429
·
IF 2.1
Xu Jiaxiong,Wu Xiaoshuai
Chalcogenide Cu 2 ZnSn(S,Se) 4 (CZTSSe) is a promising absorber material for photovoltaic applications. When CZTSSe thin film is deposited on an Mo substrate, a Mo(S,Se) 2 layer easily forms between the CZTSSe and the Mo, which is detrimental to the back contact property of the CZTSSe. This work proposes a useful way to inhibit the formation of Mo(S,Se) 2 by sputtering a CuCrO 2 layer on a Mo-foil substrate before the deposition of the CZTSSe. The effects of CuCrO 2 thickness on the crystalline structures, morphologies, and electrical properties of the fabricated samples were studied. The results showed that the insertion of the CuCrO 2 layer prevented the formation of Mo(S,Se) 2 . As the thickness of the CuCrO 2 increased, the thickness of the Mo(S,Se) 2 layer decreased. The Mo(S,Se) 2 layer was absent from the cross-sectional scanning electron microscopy image when the CuCrO 2 thickness exceeded 85 nm. The back contact resistance of CZTSSe decreased monotonously as the CuCrO 2 layer thickened due to the reduction in the Mo(S,Se) 2 layer thickness. Therefore, by inserting a CuCrO 2 layer to separate the CZTSSe and the Mo-foil, the formation of the Mo(S,Se) 2 layer between them was effectively suppressed, and the back contact properties of the CZTSSe thin film were significantly enhanced.
研究领域:
材料科学
·
光伏技术
·
薄膜太阳能电池
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2015
·
IF 3.942
Li Yue,Guangci Li,Feng Zhang,Lei Chen,Xuebing Li,Xiang Huang
A series of CoMoO 4 hydrates composed of nanorods have been synthesized with different alcohol–water solvent systems, and the corresponding Co–Mo sulfides are obtained after sequential calcination and sulfurization. The characterization results show the change in solvent system can efficiently adjust the particle size of the Co–Mo precursors, while cannot affect their components and morphologies. Because of the different particle size, the specific surface areas (SSA) of the final Co–Mo sulfides are different. The particles with small size can lead to a high SSA that benefits the exposure and dispersion of active components, and further promote the incorporation of MoS 2 slabs with Co atoms to form “Co–Mo–S” structures on the surface of the sulfides. More “Co–Mo–S” structures would create more coordinative unsaturated sites with high activity in situ during hydrodesulfurization (HDS) reaction, resulting in a higher HDS activity. Among the Co–Mo sulfides, since S-m/w derived from methanol–water system possesses the smallest particle size and the most active sites, it naturally exhibits the highest HDS activity toward dibenzothiophene.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Zhiliang Jin,Teng Li,Kai Wang,Xin Guo
Simple high-temperature calcination and hydrothermal methods were followed to synthesize CeO 2 and Mo-S, respectively. The efficient photocatalytic hydrogen evolution activity exhibited by the composite catalysts can be attributed to the edge active sites in Mo-S. The Mo-O bonds formed between CeO 2 and Mo-S could further accelerate the processes of separation and migration of electrons between the catalyst interfaces. The hybrid catalyst 10%-CeO 2 /Mo-S exhibiting the best hydrogen generation ability (4.3 mmol h −1 g −1 ) was obtained by optimizing the content of CeO 2 in CeO 2 /Mo-S. Analysis of the PL spectral profile and photocurrent response recorded for the system revealed that 10%-COMS exhibited excellent photogenerated carrier separation ability. Analysis of the LSV and EIS curves revealed that 10%-COMS exhibited the optimal hydrogen production potential. The charge migration resistance provided by the systems was lower than the charge migration resistance provided by CeO 2 and Mo-S. The synergism between the S-scheme heterojunctions and the Mo-O bonds helped accelerate the separation and migration of photo-induced carriers at the catalyst interfaces. The introduction of covalent bonds in the S-scheme heterojunctions and the results presented herein can potentially help develop a new method to realize photocatalytic hydrogen evolution.
研究领域:
材料科学
·
能源科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）