RENEWABLE ENERGY
·
2025
·
IF 9.1
Jiewen Zhu,Gang Wu,Shasha Liu,Runjie Hu,Lifan Zhong,Jie Yang,Shu Zhang,Yong Huang
Methyl levulinate (ML) is a high-value platform chemical with broad applications. However, its efficient production from lignocellulosic biomass is hindered by the recalcitrant matrix of cellulose, hemicellulose, and lignin. This study demonstrates a two-step strategy for converting pine to ML, which couples biomass pretreatment with subsequent catalytic depolymerization over a P-doped CoS 2 catalyst. The regulatory mechanisms of three distinct pretreatments, including dilute acid washing, H 2 O 2 peroxidation, and alkaline extraction, on the physicochemical structure of pine were systematically investigated. The ML yield increased from 0 (untreated pine) to 2.6 wt% after acid washing, 7.3 wt% after peroxidation, and exceeded 17 wt% following alkaline extraction with 5 wt% NaOH. The enhancement is attributed to a synergistic mechanism whereby pretreatments not only improve biomass accessibility but also crucially eliminate compounds that poison the catalytic active sites. Acid washing removes ash components, mitigating the poisoning of Lewis acid sites on the catalyst. Peroxidation and alkaline extraction disrupt the lignin-carbohydrate complex, removing lignin-derived phenolics that cause catalyst deactivation. However, excessive oxidant or alkali concentrations degrade the cellulose structure, leading to yield attenuation. This work confirms that selecting an appropriate pretreatment is paramount to balancing component removal for the efficient valorization of pine into ML.
研究领域:
催化化学
·
生物质能源
·
绿色化学
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材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Qiwei Zhang,Zhenlu Zhao
Transition metal disulfide compounds (TMDs) catalysts exhibit excellent catalytic ability in hydrogen evolution reaction (HER), but they are susceptible to OH- poisoning under strong alkali conditions leading to active site inactivation, thus affecting their catalytic activity and stability. In this regard, we propose a catalyst “self-protection” strategy against OH - attack. Specifically, we synthesized a composite heterojunction MnMoO 4 @CoS 2 /MoS 2 on carbon cloth (CC) by a hydrothermal and calcination process. The experimental results show that MnMoO 4 undergoes reconfiguration during the HER process, and its MoO 4 2- takes the lead in dissolving in the electrolyte before being re-adsorbed on the surface of the electrocatalyst to form a protective layer, which greatly inhibits the erosion of OH - on the catalyst and effectively prevents the oxidation of the Mo 4+ and the edge S sites, which is beneficial to the long-term stability of the catalyst. The CoS 2 /MoS 2 heterojunction provides more active sites and higher conductivity to enhance its catalytic activity. The products exhibit overpotentials of only 71 and 171 mV at current densities of 10 and 100 mA cm −2 , and have long-term stability of over 100 h. In comparison, the samples after base hydrolysis treatment (deprotection) showed a significant performance decay. This study provides a novel approach for the rational design of efficient and stable TMDs catalysts.
研究领域:
催化
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材料科学
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电化学
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纳米技术
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能量转换
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表面科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Quan Kong,Nanyu Fan,Siyi Chen,Xiaofen Wu,Lihua Liu,Ruifeng Lang,Zeyuan Gao,Hongtao Guan,Chengjun Dong,Gang Chen
The design and synthesis of non-noble bifunctional electrocatalysts with high efficiency for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is still ongoing for enhanced overall water splitting. Herein, the heterostructure N-doped nickel sulfide/cobalt sulfide (N-Ni 3 S 2 /CoS 2 ) catalyst was in situ growth on Ni foams (NF) via an electrochemical deposition method followed by rapidly vulcanizing process at low-temperature. Benefiting from the abundant interface, high conductivity of NF, large electrochemical surface area, N-Ni 3 S 2 /CoS 2 /NF catalyst exhibits excellent activity for both HER and OER. Low overpotentials of 245 and 100 mV can drive a current density of 10 mA cm −2 for OER and HER in 1.0 M KOH. Serving as the bifunctional catalysts, N-Ni 3 S 2 /CoS 2 /NF catalyst delivers the current density of 10 mA cm −2 at a very low cell voltage of 1.56 V in the water splitting reaction.
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 22
·11435-11441
·
IF 11.301
Peng Liu,Jianyue Yan,Jianxin Mao,Jiawen Li,Dongxue Liang,Wenbo Song
The alkaline hydrogen evolution reaction (HER) is an extremely important reaction in energy conversion and electrolytic industries. Pristine MoS2 exhibits poor alkaline HER activity due to weak water adsorption and dissociation. Precisely manipulating active water dissociation components to form a functional interface with MoS2 would be an effective strategy. Herein, in-plane intergrowth CoS2/MoS2 ultrathin nanosheets have been achieved via a one-step pyrolytic sulfurization of a small-sized Co/Mo-MOF precursor. The in-plane intergrowth structure produced abundant interfaces and modulated the interfacial electronic structure, demonstrating an accelerated water dissociation process. Ultralow overpotentials at both onset (16 mV) and 10 mA cm−2 (75 mV) have been obtained, which surpass those of most top-rated MoS2-based materials and are even proximate to those of commercial Pt/C (0 mV at onset and 60 mV at 10 mA cm−2, respectively). Under a large current density of 400 mA cm−2, the intergrowth nanosheet exhibited long-term stability, showing potential for applications in alkaline water splitting devices.
研究领域:
材料科学
·
能源转换技术
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Xiaona Li,Weiyang Zhang,Zhengyan Gu,Qingbin Cai,Hongwei Kang,Baocheng Yang,Zhikun Li
Transition metal sulfides (TMSs) are a class of advanced electrode materials for new energy storage devices with superior performance due to their many advantages, such as high specific capacity, good conductivity, low electronegativity, high redox activity, rich variety and low price. Herein, we developed N-doped reduced graphene oxide (N-RGO) decorated CoS 2 nanoparticles nanohybrids (N-RGO/CoS 2 , denoted as NGCS) by a facile hydrothermal method. The doped-N process enriches the specific surface area and porosity of RGO nanosheets, which not only forms rich network nanostructures conducive to rapid charge/ion transport, but also promotes more dispersed anchoring of CoS 2 , resulting in the formation of smaller-sized CoS 2 nanoparticles that can provide rich and exposed electroactive sites. Therefore, such unique hierarchical porous nanostructures help all components in the nanohybrids to “complement each other's strengths”, so that the fabricated NGCS electrode exhibits a high specific capacitance of 797.1 F g −1 at 0.6 A g −1 and an excellent rate capability with 77.5 % retention (20 A g −1 ). Furthermore, the assembled NGCS//AC hybrid supercapacitor (HSC) delivers excellent energy density of 41.4 Wh kg −1 (at 719.7 W kg −1 ) and long-term cyclability with 86.02 % capacitance retention after 13,000 cycles, presenting a promising application potential in new high-performance energy storage and conversion devices.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Ximin Ling,Wutao Wei,Changwei Shan,Xuyan Qin,Mingjie Song,Zhao Liu,Liwei Mi
Mg 2+ /Li + hybrid batteries (MLHBs), which support the rapid insertion and removal of Mg 2+ /Li + bimetallic ions, are promising energy storage systems. Inspired by the Kirkendall effect, ball-in-ball bimetallic sulfides with heterostructures were prepared as cathode materials for the MLHBs. First, a nickel–cobalt precursor (NiCo-X precursor) with three-dimensional (3D) nanosheets on its surface was prepared using a solvothermal method based on the association reaction between alkoxide molecules. Subsequently, the NiCo-X precursor was vulcanized at high temperature using the potential energy difference as the driving force to successfully prepare NiS 2 @CoS 2 core–shell hollow spheres. When used as the positive electrode material for the MLHBs, the NiS 2 @CoS 2 hollow spheres exhibited excellent Mg 2+ /Li + ion storage capacity, high specific capacity, good rate performance, and stable cyclic stability owing to their tough hierarchical structure. At a current density of 500 mA g −1 , a specific capacity of 536 mAh g −1 was maintained after 200 cycles. By explaining the transformation mechanism of Mg 2+ /Li + in bimetallic sulfides, it was proven that Mg 2+ and Li + worked cooperatively. This study provides a new approach for developing MLHBs with good electrochemical properties.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 14
·6795-6803
·
IF 11.301
Lang Pei,Jiasong Zhong,Taozhu Li,Wangfeng Bai,Shiting Wu,Yongjun Yuan,Yifan Chen,Zhengtao Yu,Shicheng Yan,Zhigang Zou
Developing a highly efficient and low-cost oxygen-evolution-reaction (OER) electrocatalyst is an important route to overcome the rate-determining step of water splitting. Here, we directly grew a CoS2 nanoarray core with an N-doped graphitic carbon (NGC) shell on Ni foam (NF) to construct a core–shell nanorod array electrode, CoS2@NGC@NF. The CoS2 core with a high work function (∼5.5 eV) tends to capture electrons from the NGC layer (4.5–5.2 eV) to induce an electron-poor NGC shell with a significant downshift of the carbon Fermi level, facilitating the adsorption of O-containing intermediates and affording decreased activation energy during the OER process. As a result, the three-dimensional NGC encapsulated CoS2 array assembly exhibited excellent electrocatalytic OER activity with a low overpotential of 243 mV at a current density of 10 mA cm−2 and a small Tafel slope of 71 mV dec−1 in 1.0 M KOH. Our findings may suggest that manipulating the interface energetics by the work function difference is a potential route to the design of high-performance OER electrocatalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yueqian Yan,Xiaohong Zhou,Wen Jin,Xingyuan Wang,Lei Song,Ziyi Luo,Tuqiao Zhang,Miaomiao Ye
Fenton reaction is a traditional advanced oxidation process that has long been used for wastewater treatment. However, the narrow pH range of 2–4, the inefficient utilization of both H 2 O 2 and Fe 2+ , and the large amount of iron sludge formation limit its application. Here, we prepared sodium alginate composite hydrogel spheres with both Fe 2+ and CoS 2 loading (denoted as CoS 2 /Fe/SA hydrogel spheres) to construct a CoS 2 /Fe/SA + H 2 O 2 reaction system. The degradation efficiency of carbamazepine (CBZ) in the CoS 2 /Fe/SA + H 2 O 2 system was significantly enhanced with a first-order kinetic reaction constant of 0.1958 min −1 , which is 8.9 times higher than that in Fe 2+ +H 2 O 2 system. When the initial solution pH was in the range of 2–8, the removal rate of CBZ at 90 min reaction time ranged from 96.5 % to 99.9 %. The enhanced degradation efficiency even in a slightly alkaline aqueous solution was due to the sustained slow release of Fe 2+ from the CoS 2 /Fe/SA hydrogel spheres that enhances the utilization of Fe 2+ and the promotion of Fe 3+ /Fe 2+ cycling via CoS 2 . Moreover, the release amount of Fe 2+ in CoS 2 /Fe/SA hydrogel spheres could be controlled by tuning the Fe 2+ loading amount during preparation, which in turn determines its number of cycling uses.
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
ChemistrySelect
·
2025
·Vol. 10
·期 4
·e202405183
·
IF 2
Jingwen Zhang,Zeyang He,Hao Fu,Wei Kong,Petr Senin,Arkadii Proskurin,Ting Bian,Shitan Yan
Graphical Phosphomolybdic acid doping and co-etching with thioacetamide at low temperatures resulted in the formation of uniformly Mo-doped CoS₂ nanoparticles exhibiting a hollow structure that increased the number of active sites and provided abundant reaction sites. In terms of performance, Mo-CoS₂ exhibits the competitive OER and HER properties for an efficient overall water splitting. Nowadays, the sluggish hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) kinetics are the key obstacles limiting the commercial application of water splitting. In this study, a size-matching strategy is proposed to construct the molybdenum-doped CoS 2 polyhedra (Mo-CoS 2 ) by encapsulating polyoxometalate (POM, H 3 PMo 12 O 40 ) guests into mesoporous zeolite imidazolium framework-67 (ZIF-67), with thioacetamide (TAA) serving as a gentle sulfur source. The catalyst exhibits a pronounced hollow structure due to the synergistic etching effects of POM and TAA, which can increase the number of active sites. Additionally, the incorporation of Mo optimizes the electronic structure, thereby improving both HER and OER performance. In alkaline electrolytes, Mo-CoS 2 delivers an overpotential of 330 mV and 269 mV for OER and HER, respectively, to produce a current density of 100 mA cm −2 . Moreover, Mo-CoS 2 demonstrates exceptional performance in overall water splitting, achieving a cell voltage of 1.55 V at 10 mA cm −2 , along with outstanding long-term stability. This study provides a promising avenue for the structural and component optimization of cobalt sulfide, which could significantly improve the efficiency of hydrogen production.
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 Environmental Chemical Engineering
·
2025
·Vol. 14
·期 1
·120613
·
IF 7.2
Xiao Feng,Qiqi Gan,Zhongliang Li,Yunhong Zhao,Tengfeng Xie,Dejun Wang,Yanhong Lin
Photocatalysis-coupled advanced oxidation rapidly mineralizes pollutants; here we engineer a Fe-CoS 2 /ZnIn 2 S 4 composite catalyst that activates peroxymonosulfate under visible light to eliminate tetracycline within minutes. The structure, morphology, composition, and optical properties of the photocatalyst were analyzed in detail. Fe-CoS 2 /ZnIn 2 S 4 exhibited markedly improved degradation performance, achieving 88 % TCH removal within 10 min and 94.6 % degradation efficiency within 30 min. The separation and transfer characteristics of photogenerated charges were investigated via surface photovoltage (SPV), transient photovoltage (TPV), photoluminescence (PL) spectroscopy, and UV–visible diffuse reflectance spectroscopy (UV-Vis DRS). Furthermore, the degradation of organic pollutants by sulfate radical-based advanced oxidation processes (SR-AOPs) assisted by photocatalysis was thoroughly studied. The test results demonstrate that the synergistic effects of metal nanoparticle loading and heterojunction construction enable the composite catalyst to achieve efficient photogenerated-carrier separation and rapid Co 3 + /Co 2+ cycling, thereby accelerating PMS activation and generating abundant radicals for pollutant removal. This study offers new insights for developing highly efficient PMS photo-activators for water treatment.
研究领域:
环境催化
·
光化学
·
水处理
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材料科学
·
环境功能材料
·
高级氧化技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Guoliang Gao,Bo Fang,Zibiao Ding,Wei Dong,Yu-Xiao Li,Xue Lu Wang,Ye-Feng Yao
The construction of efficient and stable non-noble metal bifunctional electrocatalysts for the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) presents a challenge in electrocatalytic water splitting. CoS 2 is a promising electrocatalyst that could replace precious metals. In this work, a series of Co-MOF precursors having average particle sizes ranging from the nanometer to the micron scale (86–1084 nm) were synthesized in an unprecedented attempt; Co/CoS 2 heterojunction embedded in nitrogen doped carbon framework (Co/CoS 2 @NC) was prepared through further carbonization and sulfurization . The samples were characterized and evaluated by X-ray powder diffractometer (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and electrochemical techniques . The results indicate that when the size of Co-MOF is less than 300 nm, the cubic structure framework easily collapses to form the spherical structure during the carbonization process. The catalytic activity of Co@NC is size-dependent; Co/CoS 2 @NC exhibited the best performance among the series, with an overpotential of 188 mV for HER and 349 mV for OER at a current density of 10 mA cm −2 . This work provides experimental guidance for the design and synthesis of low-cost, efficient, and robust Co-based electrocatalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Cell Reports Physical Science
·
2022
·
IF 7.832
Han Man,Jingjing Feng,Shaofei Wang,Shuyang Li,Peng Li,Huiwen He,Wioletta Raróg-Pilecka,Jie Zhao,Jichao Zhang,Fang Fang,Dalin Sun,Yongtao Li,Yun Song
Transition-metal chalcogenides (TMCs) show great potential as highly efficient and cost-effective electrocatalysts for oxygen evolution reaction (OER). Yet the electrochemical conversion into oxides/hydroxides remains poorly understood. In this work, we develop a built-in, electric-field-induced surface reconstruction strategy for ultra-fast self-activation of transition metal sites in self-supporting CoS 2 /CuS heterostructures. The activated CoS 2 /CuS grown on carbon cloth with oxygenated surface species displays an outstanding OER electrocatalytic activity with ultra-low overpotentials of only 136 mV at the current density of 10 mA cm −2 and 266 mV at 100 mA cm −2 in 1.0 M KOH. Comparative studies via synchrotron radiation X-ray absorption spectroscopy and theoretical calculations are employed to elucidate that the built-in electric field within heterointerfaces significantly promotes the reconstruction efficiency by decreasing the formation energy of (oxy)hydroxide species. We believe this work provides new perspectives to conceive catalysts with ultra-low overpotentials and complements the fundamental comprehension of TMCs’ self-reconstruction mechanism.
研究领域:
材料科学
·
电化学
·
催化科学
✓ 已验证
DOI
高影响因子
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