CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Jiangshan Gao,Yide Hao,Shuyan Lin,Ziming Zhang,Huifang Li,Yan He
The microstructure of carbon nanotubes (CNTs) plays a pivotal role in determining their performance as electrode materials. Herein, CNTs encapsulating NiSe 2 /CoSe 2 nanoparticles (CNT@NiCo-Se) are derived from Ni-Co Prussian blue analogue (Ni-Co PBA), and the CNTs possess smaller diameter and larger interlayer spacing due to the “etching and isolation technique” that is adopted to prevent the accumulation of Ni/Co in Ni-Co PBA during the calcination process. CNT@NiCo-Se exhibits a specific capacity of 105.1 mAh g −1 at a current density of 1 A g −1 , which is 375 % higher than that obtained without isolation strategy, which resulted in the microstructure advantages of smaller diameter and larger interlayer spacing. The actual reason is that smaller diameter and larger interlayer spacing correspond to higher charge transfer density and increased the –OH binding energy (OHBE) according to density functional theory (DFT) calculation results. In addition, the assembled asymmetric supercapacitor (ASC) device exhibits a high energy density of 46.3 Wh kg −1 at 801 W kg −1 and a high power density of 8000 W kg −1 at an energy density of 12.0 Wh kg −1 , and the initial specific capacitance of 80.4 % can be maintained after 10,000 cycles at 10 A g −1 . More importantly, this work provides a novel strategy for microstructure adjustment of CNTs in the field of energy storage and conversion.
研究领域:
材料科学
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能源存储与转换
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DOI
高影响因子
Journal of Materials Chemistry A
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2022
·Vol. 10
·期 30
·16268-16279
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IF 14.511
Hui Zheng,Jianyi Wang,Hongwei Li,Shuqi Deng,Yinze Zuo,Wei Yan,Jiujun Zhang
Sodium-ion batteries (SIBs) are among the most promising technologies for large-scale clean electrical energy storage and conversion. Developing SIB anode materials, which pose the major limitation in achieving high performance, including transition metal selenides (TMSe) with high sodium storage capacities is currently the cutting-edge research. In this paper, heterostructured NiSe2/CoSe2 nanoparticles are successfully synthesized by simple thermal selenization of a heterojuncted Ni(OH)2/Co(OH)2 precursor obtained through one-step solvothermal co-precipitation. Electrochemical tests and DFT calculations as well as in situ XRD measurements are used for investigating the Na storage properties and understanding the underlying mechanism. It is found that the heterointerface formed at the crystalline planes of NiSe2 and CoSe2 significantly improves the electron conductivity and optimizes the Na species adsorption, which accelerates electrochemical reaction kinetics and thus improves pseudocapacitive contribution. Therefore, the as-prepared NiSe2/CoSe2 nanoparticles exhibit superior Na storage properties such as enhanced Na storage capacity and rate capability as well as exceptional cycling stability at ultra-high current density.
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
He Wang,Hongling Guo,Zihao Huang,Weiliang Liu,Mei Li,Jinshui Yao,Jiaxi Cui,Yuanhao Wang,Manman Ren
The high activity barriers of Li 2 S nucleation and deposition limit the redox reaction kinetics of lithium polysulfides (LiPSs), meanwhile, the significant shuttle effect of LiPSs hampers the advancement of Li-S batteries (LSBs). In this work, a NiSe 2 /CoSe 2 -rGO (NiSe 2 /CoSe 2 -G) sulfur host with bifunctional catalytic activity was prepared through a hard template method. Electrochemical experiment results confirm that the combination of NiSe 2 and CoSe 2 not only facilitates the bidirectional catalytic function during charge and discharge processes, but also increases the active sites toward LiPSs adsorption. Simultaneously, the highly conductive rGO network enhances the electronic conductivity of NiSe 2 /CoSe 2 -G/S and provides convenience for loading NiSe 2 /CoSe 2 catalysts. Benefitting from the exceptional catalytic-adsorption capability of NiSe 2 /CoSe 2 and the presence of rGO, the NiSe 2 /CoSe 2 -G/S electrode exhibits excellent electrochemical properties . At 1C, it demonstrates a low capacity attenuation of 0.087 % per cycle during 500 cycles. The electrode can maintain a discharge capacity of 927 mAh/g at a sulfur loading of 3.3 mg cm −2 . The bidirectional catalytic activity of NiSe 2 /CoSe 2 -G offers a prospective approach to expedite the redox reactions of active S, meanwhile, this work also offers an ideal approach for designing efficient S hosts for LSBs.
研究领域:
材料科学
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电化学
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能源存储
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Xiao-Man Cao,Yi-Feng Shao,Yan-Cun Dong,Qingguo Zhang,Hao Ge,Daliang Liu,Qiong Wu,Zhi-Jia Sun
The unique structure and strong interaction of multiphase hybrid materials have garnered significant attention as prospective candidates for electrode materials in the realm of energy storage. The present study presents a rational design of a functional NiSe 2 -CoSe 2 /N, B double-doped carbon hybrid composite (NCS/C NB ), resulting in the emergence of various novel cooperative regulatory mechanisms involving: (i) the heterogeneous structure of NiSe 2 and CoSe 2 generates built-in electric fields to increase electron mobility; (ii) the incorporation of polyatomic double-doped carbon (N, and B) expedites electron transfer rate; intriguingly, (iii) ionic liquids not only serve as polyatomic dopants in the reaction system but also influence the microstructure of the composite. Benefiting from these synergistic effects, the NCS/C NB hybrid exhibits remarkable charge storage capacity and rapid electrochemical kinetics, driven by its multi-fold hollow structure and multicomponent cooperative modulation. The capacity (682 C g −1 at 1 A g −1 ) and rate performance of NCS/C NB surpass those of other monometallic selenides (NiSe 2 /N, B co-doped carbon (NS/C NB ) and CoSe 2 /N, B co-doped carbon (CS/C NB )) within the same system. In the meantime, an asymmetric device using NCS/C NB as the cathode material performs admirably, displaying an exceptional energy density (51.3 Wh kg −1 at 1.28 kW kg −1 ). The present research provides valuable perspectives for the innovative design and fabrication of advanced electrode materials exhibiting exceptional electrochemical properties. We firmly believe that hollow structures featuring multiple cooperative regulatory mechanisms and abundant folds will garner significant attention.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
CHINESE CHEMICAL LETTERS
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2020
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IF 4.632
Guangmeng Qu,Xixi Zhang,Guotao Xiang,Yunrui Wei,Jiangmei Yin,Zonghua Wang,Xiaoli Zhang,Xijin Xu
Nano-polyhedral NiSe 2 /CoSe 2 (Ni-Co-Se) with hollow architectures are synthesized by selenizing the precursors of Ni-Co bimetallic hydroxides that are directly derived from ZIF-67. The as-fabricated Ni-Co-Se electrodes exhibit high specific capacitance of 1668 F/g at 1 A/g accompanying with outstanding rate capability (about 82.8% retention of the initial capacity at 20 A/g). The corresponding Ni-Co-Se//AC all-solid-state hybrid supercapacitors are assembled by directly using the Ni-Co-Se on carbon fabric as the positive electrode, which deliver high energy density and power density (38.5 Wh/kg at 802.1 W/kg, 32.0 Wh/kg at 8008.8 W/kg), excellent cyclic stability (82.3% retention after 5000 cycle) and robust mechanical flexibility (no obvious attenuation at bending to different angles). This work will provide a new and smart route for constructing transition metal selenides for supercapacitor devices.
研究领域:
材料科学
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电化学
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纳米技术
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能源存储
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）