JOURNAL OF CHEMICAL RESEARCH
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2021
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IF 0.782
Jianning Li,Chunyong Zhang,Yingpin Wen,Yuyue Zhao,Yiwen Zhang,Li Shu,Hengfei Qin
Binary transition metal oxides exhibit improved properties including good redox potentials and electrical conductivities compared with single metal oxides as electrode materials in energy storage. Herein, ZIF-67 is prepared by a one-step method using Co2+ as the central metal ion, 2-methylimidazole as the organic ligand, and methanol as an organic solvent at room temperature. Hollow NiCo2O4 and sheet-like Co3O4/NiCo2O4 derived from bimetallic imidazolate framework precursors were synthesized by adding cobalt and nickel ions in appropriate proportions. A hollow and porous structure is achieved for the reaction between a nickel salt and ZIF-67, and this unique nanostructure provides a high active surface area, which is beneficial to the electrochemical properties. Several samples are prepared and used as electrode materials for electrochemical tests in 6 M KOH. As a result, the Co3O4/NiCo2O4 electrode with a sheet nanostructure showed a high specific capacitance of 846 F g−1 at a current density of 0.5 A g−1. This Co3O4/NiCo2O4 electrode material is promising for future studies on high-performance supercapacitors to solve emerging energy-related problems.
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
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2021
·Vol. 46
·期 2
·1813-1825
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IF 5.164
Zhong Dai,Peng-Gang Ren,Zhengzheng Guo,Xin Hou,Wenwei He,Fang Ren,Yanling Jin
Summary With the rapid development of portable electronic devices, it is strongly urgent to explore the flexible and sustainable supercapacitor with lightweight, large power/energy density, good cycle stability, outstanding coulombic efficiency, and excellent operational safety. Herein, a novel and flexible all-solid-state asymmetric supercapacitor is assembled from silver (Ag) or/and cobalt acid nickel (NiCo 2 O 4 ) nanoparticles coated with hollow carbon micro-skeleton (HCMS-Ag and HCMS@NiCo 2 O 4 -Ag). The HCMS@NiCo 2 O 4 -Ag electrode is subsequently prepared by a facile hard template combined with hydrothermal method. The morphology analysis shows that plenty of NiCo 2 O 4 nanoflowers composed of a tremendous number of nanoneedles are uniformly grown on the three-dimensional hollow carbon micro-skeleton. This unique and novel structure endows the prepared electrode with a high specific capacitance of 527.4 F g −1 at a current density of 0.5 A g −1 and outstanding rate capability of 75%. The assembled pliable asymmetric supercapacitor possesses a maximum energy density of 42.67 Wh kg −1 , long cycle life (97.4% capacitance retention), and excellent flexibility. Therefore, this work opens new horizon to develop the next-generation carbon composites for flexible all-solid-state asymmetric supercapacitor with high levels of electrochemical properties.
研究领域:
材料科学
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能源存储
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Wenhao Tang,Shiyan Deng,Youlan Zou,Huiyao Li,Shuang Deng,Zengsheng Ma
All-solid-state lithium sulfur batteries (ASSLSBs) hold significant promise in the application of high energy density batteries, yet they suffer from poor ionic conductivity, low Li + transference number and unsatisfactory lithium polysulfides (LiPSs) conversion. In this paper, porous-dual-shell structure and heterojunction Co 3 O 4 @NiCo 2 O 4 is prepared and composited with polyethylene oxide (PEO)-based solid polymer electrolytes (SPEs) to address these problems. The superimposed electric field for Co 3 O 4 @NiCo 2 O 4 composed of the heterointerfaces -build-in electric field and the surface oxygen-rich vacancies-build-in electric field facilitates the dissociation of Li salts, thus improving the ionic conductivity. It exhibits high ionic conductivity of 1.04 × 10 −3 S/cm and Li + transference number of 0.48 at 60 °C. Besides, the incorporation of Co 3 O 4 @NiCo 2 O 4 heterojunction enables fast LiPSs conversion and improves the electrochemical kinetics. The Li//Li cell can work stably for 1100 h at 0.1 mA/cm 2 . The Li//S cell provides an initial capacity of 1170 mA h/g, a reversible capacity of 620.1mA h/g after 100 cycles and 308.3 mA h/g after 450 cycles at 0.2 C.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemSusChem
·
2022
·Vol. 15
·期 10
·e202200288
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IF 9.14
Ting Feng,Haiyan Li,Rongjie Gao,Ge Su,Wei Wang,Bohua Dong,Lixin Cao
Graphical Close to the edge : A Mn 0.25 Cd 0.75 S/NiCo 2 O 4 p–n heterostructure is synthesized through a hydrothermal method and shows a high photocatalytic H 2 evolution rate of 61159 μmol g −1 h −1 . The band edge position is estimated by the core level alignment method, which affords a deeper understanding of the p–n heterostructure. Photocatalytic water splitting for hydrogen evolution is one of the most promising methods to mitigate environmental and energy-related issues. In this study, manganese cadmium sulfide (Mn x Cd 1- x S) solid solution is used to construct a p–n heterostructure with NiCo 2 O 4 through a hydrothermal method. The Mn 0.25 Cd 0.75 S/NiCo 2 O 4 composites are used for photocatalytic hydrogen evolution reaction, and the optimal hydrogen rate with 40 mg of Mn 0.25 Cd 0.75 S/NiCo 2 O 4 40 mg (MCS/NCO 40) is 61159 μmol g −1 h −1 , which is about 16.3 times than that of pure Mn 0.25 Cd 0.75 S. After combining with NiCo 2 O 4 , the light absorption scale, the separation efficiency of photogenerated carriers, and the reaction kinetics are enhanced. Moreover, the band offset of MCS/NCO composites is calculated by the core level alignment method, demonstrating the formation of a p–n heterostructure. The built-in electric field from the p–n heterostructure drives charge transfer and enhances separation efficiency, which results in improved photocatalytic performance.
研究领域:
材料科学
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化学
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能源科学
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环境科学
✓ 已验证
DOI
PubMed
高影响因子
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