ChemCatChem
·
2018
·Vol. 10
·期 23
·5533-5540
·
IF 4.674
Xiaoqiang Du,Jianpeng Fu,Xiaoshuang Zhang
Graphical Foaming at the mouth of the catalyst : NiCo 2 O 4 @NiMoO 4 core−shell hybrid nanostructure was successfully prepared by hydrothermal calcination method. The nanostructure is a low cost and relatively stable electrocatalytic water splitting catalyst. The NiCo 2 O 4 @NiMoO 4 /NF-8 h nanorod electrode shows excellent electrocatalytic activity with a low voltage 1.55 V and stability with long hour electrolysis, which is highly satisfactory for a prospective bifunctional electrocatalyst. Splitting water to make hydrogen is one of the most effective ways to solve the energy crisis. In this paper, we started with the catalysts of the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) of electrocatalytic water splitting, studied the catalysts with great stability and practicality, and designed NiCo 2 O 4 nanowires as precursors, on whose surface we set NiMoO 4 nanosheets. Cobalt elements were introduced on the nickel foam with electrocatalytic properties, and a flower-like NiCo 2 O 4 @NiMoO 4 core-shell hybrid nanostructure was prepared by a hydrothermal method. The series of core-shell nanocatalysts were characterized via XRD, SEM, XPS, etc. The electrochemical properties of the obtained catalysts were also measured, and the conclusion that the catalysts could reduce the overpotential of the reaction required was figured out. The conclusion of the overpotential of catalyzing the water splitting reaction provides new ideas for the research of the catalyst for electrocatalytic water splitting reaction.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Jingwen Shen,Qiguan Wang,Kai Zhang,Sumin Wang,Lu Li,Shibo Dong,Shaoting Zhao,Jian Chen,Risheng Sun,Yan Wang,Zengyun Jian,Wenzhi Zhang
Based on carbon cloth, flexible solid-state supercapacitors from bimetal oxide arrays of NiCo 2 O 4 @NiMoO 4 deposited by conductive polymers of polyaniline (PANI) are prepared employing a two-step hydrothermal reaction , followed by high-temperature annealing and an in-situ polymerization process. The presence of NiMoO 4 nanoplates prepared on NiCo 2 O 4 nanowhires leads to the hierarchical flower-like nanostructures . In order to further enhance the conductivity and wettability, NiCo 2 O 4 @NiMoO 4 is coated by the three-dimensional networks of PANI nanorods by means of the in-situ polymerization of aniline, the obtained NiCo 2 O 4 @NiMoO 4 /PANI nanocomposites illustrate a specific hierarchical holothurian-like morphology, which facilitates the adsorption and penetration as well as the rapid transportation of electrolyte ions within the nanopores in the active electrode materials , resulting in excellent electrochemical performances. The specific areal capacitance of the flexible carbon cloth-based electrodes reaches 2.38 F cm −2 at current density 1.0 mA cm −2 , and the capacitance retention is 92.36% of the initial value after 5000 cycles, which finds applications in flexible and wearable devices.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2023
·Vol. 29
·期 7
·2925-2933
·
IF 2.8
Wang Lu,Li Jingjing,You Junhua,Wang Zhiwei,Qi Xiaojing,Xu Jingsheng
NiCo 2 O 4 /NiMoO 4 hierarchical composite structure is used for high-performance supercapacitors electrode materials. The electrode material is grown directly on the conductive carbon cloth, which effectively reduces the contact resistance between the collector and the active material, and provides a favorable skeleton structure for NiCo 2 O 4 /NiMoO 4 . In this work, NiCo 2 O 4 /NiMoO 4 electrodes were prepared under optimal conditions of primary hydrothermal time of 12 h, annealing temperature of 350 °C, and secondary hydrothermal time of 8 h. The optimized hierarchical NiCo 2 O 4 /NiMoO 4 electrode exhibits a high areal capacitance of 3.85 F·cm −2 (at a current density of 4 mA·cm −2 ) and better cycle stability than the NiCo 2 O 4 and NiMoO 4 electrode, respectively. The constructed asymmetric supercapacitor NiCo 2 O 4 /NiMoO 4 //AC has a satisfactory energy density of 38.69 Wh·kg −1 at 228.56 W·kg −1 power density. At the current density of 4 mA·cm −2 , ASC devices still have a capacity retention rate of 90.88% after 5000 cycles, indicating their potential application in energy storage devices.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Yu Liu,Zhenlin Ma,Na Xin,Yulong Ying,Weidong Shi
Multi-dimensional metal oxides have become a promising alternative electrode material for supercapacitors due to their inherent large surface area. Herein, P-doped NiCo 2 O 4 /NiMoO 4 multi-dimensional nanostructures are synthesized on carbon clothes (CC) with a continuous multistep strategy. Especially, P has the best synergistic effect with transition metals, such as optimal deprotonation energy and OH – adsorption energy, which can further enhance electrochemical reaction activity. For the above reasons, the P-NiCo 2 O 4 /NiMoO 4 @CC electrode exhibits an ultra-high specific capacitance of 2334.0 F g −1 at 1 A g −1 . After 1500 cycles at a current density of 10 A g −1 , its specific capacity still maintains 93.7%. Besides, a P-NiCo 2 O 4 /NiMoO 4 @CC//activated carbon device (hybrid supercapacitor or device) was also prepared with a maximum energy density of 45.1 Wh kg −1 at a power density of 800 W kg −1 . In particular, the capacity retention rate is still 89.97% after 8000 cycles due to its excellent structural stability. Our work demonstrates the vast potential of multi-dimensional metal oxides in energy storage.
研究领域:
材料科学
·
能源工程
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Energy Technology
·
2018
·Vol. 7
·期 5
·1800940
·
IF 3.175
Maofeng Zhang,Wenzhen Liu,Ran Han,Jun Xu,Zhenjie Sun,Jiaqin Liu,Yucheng Wu
The synthesis of an efficient and economically viable supercapacitor material with a large areal capacitance for miniaturized consumer electronics is still a major challenge. Herein, densely packed 3D flower-like NiCo 2 O 4 @NiMoO 4 /reduced graphene oxide (rGO) composites on Ni foam which can be directly utilized as a supercapacitor material are demonstrated. The overall electrochemical performance can be significantly enhanced by an increase in the packing density of 3D flower-like structure, highly porous spatial construction, and the synergistic effects of the three materials, which generates a larger areal capacitance of 9.41 F cm −2 and a superior cycling stability with 75% areal capacitance retention after 2000 charge–discharge cycles. This simple and low-cost supercapacitor material may have potential applications in energy storage devices.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）