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
Batteries & Supercaps
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2023
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IF 5.7
Jiaquan Liu,Zitong Ding,Qiuman Zhou,Lanfei Wei,Yurong Yan
Graphical Metal selenides/biomass derived carbon composite (Ni,Co)Se/BLC was prepared from banana leaves through carbonization and hydrothermal reaction. The metal selenides provide high pseudo-capacitance and the hierarchical porous structure of activated carbon promotes the uniform distribution of them. The prepared composite shows excellent electrochemical properties as supercapacitor electrode. Modification with transition metal compounds is an effective strategy to improve the capacitance of biomass derived carbon. In this work, high-performance (Ni,Co)Se/banana leaves derived carbon ((Ni,Co)Se/BLC) composite with 3D porous structure was prepared by two-step carbonization and subsequent hydrothermal reaction process. The prepared (Ni,Co)Se/BLC exhibits a high specific capacitance of 840.6 F/g at a current density of 1 A/g, which is more than five times comparing with the carbon matrix. Asymmetric supercapacitor, assembled with the (Ni,Co)Se/BLC composite as the positive electrode and BLC as the negative electrode, exhibits a wide potential window of 1.5 V, delivers a high energy density of 34.3 Wh/kg at a power density of 749.8 W/kg, and the power density can reach 7500 W/kg at the energy density of 19.4 Wh/kg. The results reveal that the modification of metal selenide can greatly improve the electrochemical properties of biomass derived carbon, which is significant for the application of biowaste in supercapacitor electrode materials.
研究领域:
材料科学
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能源存储
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环境科学
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产品关联
DOI
高影响因子
DALTON TRANSACTIONS
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2020
·Vol. 50
·期 1
·391-397
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IF 4.174
Yunmei Du,Huimin Zhao,Wensi Wang,Yu Yang,Minghui Wang,Shaoxiang Li,Yanru Liu,Lei Wang
A heterogeneous structure formed by coupling two or more phases can reinforce the activity of active sites and expedite electron transfer, which is conducive to boosting its electrocatalytic activity. Herein, we designed nickel foam supported (NiCo2)Se@Ni(OH)2 (NCS@NH) heterojunction nanosheets by a two-step method. First of all, the NiCo2S4@Ni(OH)2 (NiCo2S4@NH) nanosheets coated on nickel foam were acquired via a hydrothermal method. In the selenization treatment that followed, NiCo2S4@NH was converted into NCS@NH heterogeneous nanosheets in which the selenide nanoparticles decorated on the surface of the Ni(OH)2 nanosheets formed heterojunction interfaces, and the heterogeneous structure could accelerate electron transfer, thus improving the catalytic activity. The Ni(OH)2 nanosheets can adequately contact the electrolyte and promote the decomposition of water. Meanwhile, the thickness of the Ni(OH)2 nanosheets gradually decreases with the increase of Co doping (1.5–2.5 mmol), consequently affecting the HER properties. Notably, when the amount of Co salt added is 2 mmol, NCS@NH exhibited superior HER properties (with a voltage of 253 mV at 100 mA cm−2) and excellent stability for 24 h.
研究领域:
材料科学
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电化学
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催化
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2017
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IF 6.216
Li Shao,Xing Qian,Hongmei Li,Chong Xu,Linxi Hou
Ternary nickel cobalt selenide (Ni-Co-Se) alloy based hollow microspheres have been successfully synthesized via a simple one-step hydrothermal route by controlling different hydrothermal temperatures. The prepared samples were divided by reaction temperatures (140, 160, 180 and 200 °C) and named as Ni-Co-Se-140, Ni-Co-Se-160, Ni-Co-Se-180 and Ni-Co-Se-200, respectively. With the temperature increasing, the hollow microspheres formed at the lower temperature and broke at the higher temperature, and the sample Ni-Co-Se-180 exhibited the most regular and homogeneous hollow microspheres with a size of 1.5–2.5 μm. Moreover, the Ni atomic ratios in Ni-Co-Se alloys increased with the temperature rising. The prepared Ni-Co-Se alloys were used as counter electrode (CE) catalysts for dye-sensitized solar cells (DSSCs). A series of electrochemical tests all verified Ni-Co-Se alloy based CEs had superior electrocatalytic activities and Ni-Co-Se-180 CE displayed the largest current density, lowest overpotential and smallest charge-transfer resistance than the other CEs and Pt CEs. Benefiting from their unique morphologies and surface structures, the cells with the Ni-Co-Se-160, Ni-Co-Se-180 and Ni-Co-Se-200 based CEs achieved high efficiencies of 8.39%, 9.04% and 8.72%, respectively, which were all higher than that of Pt CE (8.07%).
研究领域:
材料科学
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能源科学
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化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）