Journal of Energy Chemistry
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2024
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IF 14
Chunwei Dong,Yongjin Xia,Zhijiang Su,Zhihua Han,Yang Dong,Jingyun Chen,Fei Hao,Qiyao Yu,Qing Jiang,Jiaye Ye
Tin disulfide (SnS 2 ), due to large interlayer spacing and high theoretical capacity, is regarded as a prospective anode material for lithium-ion batteries. Nevertheless, the poor electron conductivity of SnS 2 and huge volumetric change during the lithiation/delithiation process lead to a rapid capacity decay of the battery, hindering its commercialization. To address these issues, herein, SnS 2 is in-situ grown on the surface of carbon nanotubes (CNT) and then encapsulated with a layer of porous amorphous carbon (CNT/SnS 2 @C) by simple solvothermal and further carbonization treatment. The synergistic effect of CNT and porous carbon layer not only enhances the electrical conductivity of SnS 2 but also limits the huge volumetric change to avoid the pulverization and detachment of SnS 2 . Density functional theory calculations show that CNT/SnS 2 @C has high Li + adsorption and lithium storage capacity achieving high reaction kinetics. Consequently, cells with the CNT/SnS 2 @C anode exhibit a high lithium storage capacity of 837 mAh/g after 100 cycles at 0.1 A/g and retaining a capacity of 529.8 mAh/g under 1.0 A/g after 1000 cycles. This study provides a fundamental understanding of the electrochemical processes and beneficial guidance to design high-performance SnS 2 -based anodes for LIBs.
研究领域:
材料科学
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能源存储
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Yuan Bao,Weijia Pu,Yiwei Zhang,Yahui Xiao,Yong Liu
Ni-Co nano-alloys confined by in-situ formed N-doped porous carbon overlayer have been prepared through chelation of metal cations with citric acid and urea followed by carbonization for hydrodeoxygenation of 5-hydroxymethylfurfural (HMF) into 2, 5-dimethylfuran (DMF). The results indicated that the Ni-Co nano-alloys were formed and homogeneously distributed within the N-doped porous carbon overlayer. The electronic effect of the Ni-Co nano-alloys significantly boosted hydrodeoxygenation activity of the Co 2 Ni 1 @NC catalyst and simultaneously inhibited further hydrogenation and opening of furan ring. The N-doped porous carbon overlayer around Ni-Co nano-alloys not only facilitated to disperse and stable Ni-Co nano-alloys through strong metal-support interaction, but also protected the Ni-Co nano-alloys from aggregation. Therefore, the Co 2 Ni 1 @NC catalyst offered superior catalytic performance with the HMF conversion of 100 % and DMF selectivity of 93.0 %. Moreover, the Co 2 Ni 1 @NC catalyst displayed excellent stability without significant activity loss after five recycles due to the spatial confinement of N-doped carbon overlayer.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2023
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IF 8.4
Ruhua Shi,Qian Zhang,Tianyi Gu,Jie Guo,Xian Wang,Wei Wang,Xian Wei,Wei Xing,Haibo Wang,Ruizhi Yang
The employing of a microporous layer (MPL) with an appropriate pore size distribution and hydrophobicity between the carbon paper substrate and catalyst layer of proton exchange membrane fuel cells (PEMFCs) plays a decisive role in the management of gas transport and the crucial prevention of water flooding. However, enhancing the performance of PEMFCs by directly altering the structure of MPL has rarely been reported. The present work addresses this issue by fabricating hierarchical porous carbon (HPC) enabled MPLs via a dual template method employing zinc oxide and sodium chloride, and a silane-coupling agent is chemically grafted to HPC components of the MPL to improve water drainage instead of applying a conventional hydrophobic treatment. The physical and electrochemical properties of gas diffusion layers formed with different MPLs are analyzed, and the results indicate that the proposed MPL with excellent water drainage and efficient gas transport capability facilitates a higher output power density (863.62 mW cm–2) and lower mass transport impedance superior to a conventional MPL. This work provides a generic and feasible structure design for the development of MPLs that significantly improves the performance of PEMFCs.
研究领域:
材料科学
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电化学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
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2019
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IF 2.584
Shuaishuai Ma,Jiandong Gu,Yingxia Han,Yuan Gao,Yuqing Zong,Zhaolian Ye,Jinjuan Xue
Visible-lightdriven C–TiO2 nanocomposites were prepared via a simple calcination and acid etching process. The C–TiO2 nanocomposites were characterized by X-ray photoelectron spectroscopy, Raman spectroscopy, X-ray diffraction, transmission electron microscopy, and high-resolution TEM. The results showed that TiO2 nanoparticles were combined with a porous carbon layer through surface C–O groups, which facilitates the strong interface interaction. The interface combination of nano-TiO2 and carbon material increases the specific surface area of nano-TiO2, widens the range of light response, and improves the efficiency of light-induced electron migration. The visible-light photocatalytic activity of the prepared photocatalyst was evaluated by the decomposition of tetracycline aqueous solution. Compared with that of pure TiO2, the photocatalytic activity of C–TiO2 nanocomposites was significantly improved. Furthermore, a possible photocatalytic mechanism was also tentatively proposed. This work can promote the development of active photocatalysts under solar light for the photodegradation of environmental pollutants.
研究领域:
材料科学
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环境科学
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纳米技术
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光催化
✓ 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）