JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Zhaoling Ma,Zhen Li,Kui Hu,Dongdong Liu,Jia Huo,Shuangyin Wang
The high-energy Li S battery suffers from poor cycling performance due to the shuttle effect of the polysulfides . Strategies must be adopted to suppress the diffusion of polysulfides into the electrolyte in Li S battery . In this work, for the first time, we adopt hydrophilic carbon paper anchored by hierarchically porous cobalt disulfides as the interlayer for capturing polysulfides through physical absorption and chemical bonding. Hierarchical pores can physically adsorb polysulfides, and moreover cobalt disulfide can trap the polysulfides by forming strong chemical interaction. The sulfur-graphene composite with a sulfur content of 70.5% delivers a high initial capacity of 1239.5 mAh g −1 at 0.2 C and retains a reversible capacity of 818 mAh g −1 after 200 cycles. In spite of a little capacity contribution by the insertion of lithium ions into cobalt disulfide for the initial cycles, it disappears in the subsequent cycling. Therefore, the as-developed porous transition metal disulfides on carbon paper as the interlayer could significantly enhance the cycling performance of Li S batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Boxiao Zhao,Jun Xu,Xiaoming Liu,Along Gao,Huiqin Guo,Liushui Yan,Jun Lin
Various of CoS 2 /g-C 3 N 4 nanosheet composites were fabricated through supramolecular self-assembly and copolymerization approaches. This fabrication entailed the incorporation of CoS 2 nanoparticles into ultra-thin layers of g-C 3 N 4 nanosheets. Demonstrating a significant boost, these composites achieved a 28-fold increase in the photocatalytic H 2 evolution from H 2 O with visible light response, without the aid of noble metal nanocrystalline co-catalysts. The enhanced CoS 2 /g-C 3 N 4 composite sustained approximately 92.4 % of its initial photocatalytic activity after four repeated uses. The planar structure of g-C 3 N 4 nanosheet amplifies its specific surface area, which improves access to catalytic sites and reduces the transport distance for photo-excited electrons and holes. Moreover, the close conjunction of CoS 2 nanoparticles and g-C 3 N 4 nanosheets establishes p-n heterojunctions, which promote swift charge separation and transfer at the material interface. Based on these characteristics, an initial model for the photocatalytic process has been proposed. With its remarkable photocatalytic performance and durability, the developed CoS 2 /g-C 3 N 4 composite presents substantial potential for solar-driven H 2 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
MATERIALS CHEMISTRY AND PHYSICS
·
2020
·
IF 3.408
Ying Ji,Congpu Mu,Bochong Wang,Qian Su,Jianyong Xiang,Anmin Nie,Dachuan Cheng,Pengliang Liu,Fusheng Wen
Electromagnetic wave absorption has attracted wide attention due to electromagnetic wave pollution and radiation. The dielectric loss coating magnetic nanoparticles structure has a significant influence on electromagnetic wave absorption properties. In this manuscript, magnetic nanoparticles (CoS 2 ) coated polyaniline (PANI) are synthesized via a facile and simple two-step strategy (a microwave assisted hydrothermal reaction followed an in-situ free radical chemical oxidative polymerization). The CoS 2 nanoparticles are coated by PANI which is used as the matrix of electron conduction during converting electromagnetic energy into thermal energy. The electromagnetic wave absorption properties of PANI@CoS 2 nanocomposites can be adjusted by changing the mass ratios of CoS 2 and PANI. Compared with that of CoS 2 nanoparticles or PANI, the electromagnetic wave absorption properties of PANI@CoS 2 nanocomposites were significantly enhanced due to impedance matching and dielectric loss. When the mass ratio of PANI and CoS 2 is 1:3, this nanocomposite exhibits excellent electromagnetic wave absorption. The maximum reflection loss can reach to −54.6 dB at electromagnetic wave frequency of 12.1 GHz and effective absorbing bandwidth is 4.76 GHz ranging from 9.63 to 14.39 GHz under corresponding nanocomposites thickness of 2.1 mm. Hence, PANI@CoS 2 nanocomposites have potential application in electromagnetic wave absorption.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
Journal of Cleaner Production
·
2020
·
IF 7.246
Junfei Liu,Hai Lin,Yinhai He,Yingbo Dong,Ehma Rose Gueret Yadiberet Menzembere
Due to the mass production and the use of antibiotic drugs, the pollution of antibiotics in the environment is aggravated. Molybdenum sulfide (MoS 2 ), a kind of photocatalyst , can effectively degrade organics from the water environment. However, agglomeration and low catalytic activity sites are crucial to impeding the photocatalytic efficiency of MoS 2 nanoparticles . The aim of this study is to develop a MoS 2 composite with a higher hydrophily and excellent photocatalytic. In this study, a series of CoS 2 /MoS 2 @Zeolite photocatalysts (CoS 2 /MoS 2 @Z) with high hydrophily, adsorption capacity and photocatalytic were successfully synthesized by the combination of ultrasonic and facile hydrothermal method to solve these problems. The structure characteristics, photocatalytic efficiency, and photocatalytic degradation mechanism were systematically investigated. It was found that zeolite significantly improved the tetracycline (TC) adsorption by CoS 2 /MoS 2 @Z-50, which was conducive to the contact between TC and photocatalyst, and could further improve photocatalytic efficiency. The photocatalytic experiment results showed that CoS 2 /MoS 2 @Z-50 had the best removal effect on TC (96.71%) compared with other samples. The increase of photocatalytic activity was mainly attributed to the high active sites, separation and transfer of electrons and holes in heterojunction . Besides, the CoS 2 /MoS 2 @Z-50 maintained a good stability after five cycles of TC photodegradation . A possible photocatalytic mechanism of CoS 2 /MoS 2 @Z-50 was proposed. Synthesis of zeolite-based CoS 2 /MoS 2 heterojunction photocatalyst paves the way for TC photodegradation, which may become an efficient, environmentally friendly and a promising photocatalyst in the field of pharmaceutical wastewater treatment .
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
GREEN CHEMISTRY
·
2017
·Vol. 20
·期 3
·671-679
·
IF 9.125
Zhongzhe Wei,Shanjun Mao,Fanfei Sun,Jing Wang,Bingbao Mei,Yiqing Chen,Haoran Li,Yong Wang
Catalytic functionalized aniline formation from nitroarenes is a core technology in the synthesis of pharmaceuticals, agrochemicals, and fine chemicals. However, control of chemoselectivity still poses particular challenges with aromatic nitro substrates bearing one or more reducible groups. Here, we report the low-cost synthesis of a porous carbon supported CoS2 catalyst (CoS2/PC) and successfully apply the catalyst in the chemoselective hydrogenation of nitroarenes. For hydrogenation of 3-nitrostyrene, the catalyst furnishes a superior selectivity of 99% towards 3-aminostyrene at a conversion of >99%. Density functional theory calculations together with X-ray absorption fine structure spectroscopy reveal that terdentate and tetrahedral coordinated Co atoms in CoS2 (labeled as Co3 and Co4) are possible active sites. The face to face located Co3 and Co4 sites make the reaction rather local, and Co3 and Co4 sites are occupied by substrates and H2, respectively, which is beneficial to the superior activity and selectivity. The Co3–Co4 “synergic active site pair” in CoS2 makes the investigation of the synergic effects at the molecular level a reality on heterogeneous catalysts.
研究领域:
催化化学
·
材料科学
·
理论化学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2017
·Vol. 9
·期 20
·6886-6894
·
IF 7.367
Jizhang Yang,Zhi Yang,Lu Hua Li,Qiran Cai,Huagui Nie,Mengzhan Ge,Xi'an Chen,Ying Chen,Shaoming Huang
The oxygen evolution reaction (OER) has been viewed as a critical step in electrochemical energy conversion and storage devices. However, searching for cheap and efficient OER electrocatalysts still remains an urgent task. Herein, we develop a new strategy involving a one-step electrochemical deposition and dissolution method to fabricate hydrophilic porous CoS2/carbon nanotube (CNT) composites (CNT-CoS2). X-ray photoelectron spectroscopy and near-edge X-ray absorption fine structure spectroscopy measurements confirm the formation of hydrophilic groups on the surface of the porous CoS2 during electrochemical oxidation. Our design holds several advantages. The electricity conductivity of CoS2 is increased by introducing CNTs as a conductive substrate. The porous nanostructures of CoS2 increase its surface area, and provide paths to promote charge and reactant transfer. The active edge sites modified with hydrophilic groups can increase the content of electrolyte–electrode contact points, increasing the intrinsic catalytic performance of CoS2. These factors allow CNT-CoS2 to achieve a low onset potential of 1.33 V vs. RHE, a stable current density (j) of 10 mA cm−2 at an overpotential of 290 mV, and excellent stability under alkaline conditions compared to that of IrO2. The comprehensive performance of the CNT-CoS2 electrocatalyst is comparable to or better than that of any reported noble metal-free OER catalyst, even RuO2 and IrO2. This facile synthesis strategy involving synchronous electrochemical deposition and dissolution should be easily adapted for large-scale water electrolysis.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Linshuang Liu,Haipeng Song,Shiqi Zhao,Huan Zhang,Peng Chen,Jingjing Wu,Feifei Jia,Shaoxian Song
Based on the strong activation activity and affinity of Co and MoS 2 for peroxymonosulfate (PMS), respectively, in this study, a CoS 2 /MoS 2 @chitosan (CoS 2 /MoS 2 @CS) gel with favorable photo responsive behavior was synthetically synthesized for more potent degradation of tetracycline (TC). It was found that CoS 2 /MoS 2 @CS had excellent catalytic active for the degradation of TC under visible light irradiation. The presence of CoS 2 /MoS 2 interfacial structure improve the electron transfer ability of the MoS 2 interface, and the degradation rate of TC was increased from 0.0106 min −1 to 0.0463 min −1 , with a high degradation rate of 97.4 %. CoS 2 /MoS 2 can effectively degrade TC within 5 cycles, demonstrating superior cycling stability. In addition, the system degraded different organic pollutants (tetracycline (TC), tetracycline hydrochloride (TCH), crystal violet (CV), and methylene blue (MB)) with a degradation rate higher than 96 %, which supports the ability of the CoS 2 /MoS 2 @CS-PMS system to degrade various chemical contaminants. Quenching analysis indicates that SO 4 •− is the primary reactive chemical free radical for the degradation of TC in the CoS 2 /MoS 2 @CS-PMS system. It provides an approach of combining the synergistic action of Co (II) and photogenerated carriers for more efficient activation of PMS that some inspirations of heterojunction catalysts for AOP applications.
研究领域:
环境科学
·
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Inorganics
·
2022
·Vol. 10
·期 12
·264
·
IF 3.149
Yangqin Gao,Guoqing Yang,Zhijie Tian,Hongying Zhu,Lianzheng Ma,Xuli Li,Ning Li,Lei Ge
The bare surface of BiVO4photoanode usually suffers from extremely low interfacial charge transfer efficiency which leads to a significantly suppressed photoelectrochemical water splitting performance. Various strategies, including surface modification and the loading of co-catalysts, facilitate the interface charge transfer process in BiVO4. In this study, we demonstrate that CoS2synthesized from the hydrothermal method can be used as a high-efficient co-catalyst to sufficiently improve the interface charge transfer efficiency in BiVO4. The photoelectrochemical water splitting performance of BiVO4was significantly improved after CoS2surface modification. The BiVO4/CoS2photoanode achieved an excellent photocurrent density of 5.2 mA/cm2at 1.23 V versus RHE under AM 1.5 G illumination, corresponding to a 3.7 times enhancement in photocurrent compared with bare BiVO4. The onset potential of the BiVO4/CoS2photoanode was also negatively shifted by 210 mV. The followed systematic combined optical and electrochemical characterization results reveal that the interfacial charge transfer efficiency of BiVO4was largely improved from less than 20% to more than 70% due tor CoS2surface modification. The further surface carrier dynamics study performed using an intensity modulated photocurrent spectroscopy displayed a 6–10 times suppression in surface recombination rate constants for CoS2modified BiVO4, which suggests that the key reason for the improved interfacial charge transfer efficiency possibly originates from the passivated surface states due to the coating of CoS2.Keywords:BiVO4;CoS2;photoelectrochemical water splitting;intensity modulated photocurrent spectroscopy;surface recombination
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 44
·20574-20582
·
IF 3.3
Li-hu Qian,Wei-wei Dong,Yan-Bo Cao,Rui Ma,Yi Ding,Xi Wang
Non-precious metal sulfide bifunctional electrocatalysts with high efficiency for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) hold great promises in the overall water splitting field. In this study, a hybrid bifunctional catalyst CuCo2S4@CoS2 was fabricated by synthesizing CuCo2S4 with ZIF-67 as a template and externally modified with CoS2. The CuCo2S4@CoS2 catalyst exhibited improved alkaline oxygen evolution and hydrogen evolution activities with the overpotentials of 261 mV@10 mA cm−2 and 153 mV@10 mA cm−2, respectively. The three-dimensional interconnected nanosheet stacked structure, high conductivity of CuCo2S4, and strong interfacial interactions endowed the hybrid CuCo2S4@CoS2 catalyst with enhanced HER and OER performance due to rich electrocatalytic active sites, fast diffusion pathways for reactants and intermediates, and reduced kinetic barriers. An electrolytic cell using CuCo2S4@CoS2 as both cathode and anode required a cell voltage of 1.61 V, along with good long-term stability, to deliver a current of 10 mA cm−2, suggesting a promising bifunctional electrocatalyst for overall water splitting.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Feng Huang,Rongde Meng,Yanwei Sui,Fuxiang Wei,Jiqiu Qi,Qingkun Meng,Yezeng He
A MoS 2 -coated CoS 2 composite has been prepared successfully via a one-step hydrothermal method . This CoS 2 @MoS 2 hybrid material has a distinct morphology with few-layer MoS 2 wrapping the CoS 2 nanoparticles . Serving as a supercapacitor electrode, the obtained CoS 2 @MoS 2 hybrid material exhibits a remarkable specific capacitance of 1038 F/g, a high rate capability of 71.7%, and excellent cycling stability of 84.76% retention after 10000 cycles. The superior electrochemical properties of the CoS 2 @MoS 2 nanocomposite are attributed to the synergistic effects between the layered MoS 2 and conductive CoS 2 .
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Kang Ji,Katarzyna Matras-Postolek,Ruixia Shi,Ling Chen,Quande Che,Junpeng Wang,Yunlong Yue,Ping Yang
MoS 2 /CoS 2 heterostructures on nitrogen-doped carbon nanosheets as an efficient electrocatalyst for hydrogen evolution reaction (HER) are prepared using zeolitic imidazolate frameworks-67 as precursors. Two dimensional (2D)/2D MoS 2 /CoS 2 heterostructures consist of layered CoS 2 and MoS 2 . The (210) facet of CoS 2 and the (002) facet of MoS 2 contacted vertically resulted in improved electrons and holes transfer in the interface. The ratios of CoS 2 /MoS 2 plays an important role to get high performance (CoS 2 /MoS 2 /NC-n%, e.g. n = 20, 25, 30, 35 wt%). Meanwhile, sample CoS 2 /MoS 2 /NC-25% revealed the best HER activity, suggesting the sample has the largest number of active sites and the fastest electron transfer rate. In addition, sample CoS 2 /MoS 2 /NC-25% exhibited the lowest onset potential of 51 mV, the lowest potential of 215 mV at 10 mA cm −2 , and the smallest Tafel slope of 80.0 mV dec −1 . The result is utilizable for the construction of heterostructures with excellent HER performance.
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
·
2022
·
IF 16.744
Qun Li,Qingze Jiao,Yu Yan,Huanjun Li,Wei Zhou,Tingting Gu,Xueran Shen,Chengxing Lu,Yun Zhao,Yaoyuan Zhang,Hansheng Li,Caihong Feng
The sluggish kinetics and severe volume expansion are two major drawbacks that limiting the application of transition metal sulfides electrode materials for sodium ion batteries (SIBs). Herein, we assembled Ti 3 C 2 T x MXene nanosheets into thin-walled hollow spheres with PMMA spheres as sacrificial template, on which MOF-derived CoS 2 nanoparticles embedded in N-doped carbon were grown (MXene@CoS 2 /NC). The MXene@CoS 2 /NC exhibits state-of-the-art sodium ion storage properties, including a high reversible capacity of 620 mAh g −1 at 0.2 A g −1 , superior rate capability (394 mAh g −1 at 5 A g −1 ), and excellent cycling stability (355 mAh g −1 after 5000 cycles). The corresponding electrochemical tests prove that the MXene@CoS 2 /NC has fast Na + ion diffusion and electron transfer compared with its counterpart without MXene interfaces. XPS and XANES characterizations disclose the introduced MXene and increased pyrrolic N can weaken the Co-S bonds of CoS 2 , which facilitates the conversion reaction between CoS 2 and Na 2 S, and thus improves the sodium storage kinetics. The DFT calculations also demonstrate the MXene can improve the conductivity of electrode materials by fast interfacial electron transfer. In addition, the MXene hollow spheres and MOF-derived NC provide host structures for CoS 2 , which can increase the contact between electrolyte and active materials, buffer the volume expansion of CoS 2 , and thus enhancing the electrochemical stability. This work provides a feasible strategy to construct anode materials for SIBs with improved sodium storage kinetics and cycling stability.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）