NEW JOURNAL OF CHEMISTRY
·
2026
·
IF 2.6
Jingliang Wang,Xiaoyu Cheng,Dechao Chen,Jiaqi Yu,Zailai Xie,Changsheng Cao
The development of high-performance cathode materials is crucial yet highly challenging for aqueous alkaline zinc batteries (AZBs). Herein, hollow multi-shell NiCo2O4 spheres (NiCo2O4-HMSs) with three to four interconnected shells were prepared through controllable thermal treatment of a metal–organic framework (MOF) precursor. Benefiting from their high specific surface area and unique hollow multi-shell architecture, these nanostructured oxides facilitate efficient electrolyte penetration and rapid ion/electron transport, while simultaneously exposing abundant electrochemically active sites, thereby enabling a markedly enhanced capacity. When assembled into a NiCo2O4-HMSs//Zn battery, the cathode delivers a high specific capacity of 152.8 mAh g−1 at 2 A g−1 and outstanding cycling durability, retaining 121.1 mAh g−1 after 500 cycles at 6 A g−1, markedly outperforming its single-shelled NiCo2O4 counterpart. The resulting device further achieves an energy density up to 264.3 Wh kg−1 and a power density up to 24.7 kW kg−1, demonstrating a favorable balance between energy output and rate capability. Electrochemical analyses reveal reduced interfacial resistance and mixed capacitive/diffusion-controlled charge storage with a pronounced surface-controlled contribution at elevated scan rates, consistent with accelerated reaction kinetics enabled by the multi-shell architecture. This work highlights that rational multi-shell structural engineering provides an effective route to improve energy/power characteristics and cycling stability of NiCo2O4-based cathodes for alkaline aqueous Zn batteries.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Guoqiang Liu,Yuwen Cheng,Maoqin Qiu,Chengcheng Li,Anyang Bao,Zhongti Sun,Cuizhen Yang,Dongming Liu
Designing high-activity electrocatalysts to enhance the slow multielectron-transfer process of the oxygen evolution reaction (OER) is of great importance for hydrogen generation. Here, we employ hydrothermal and subsequent heat-treatment strategies to acquire nanoarrays-structured NiO/NiCo 2 O 4 heterojunction anchored Ni foam (NiO/NiCo 2 O 4 /NF) as efficient materials for catalyzing the OER in an alkaline electrolyte. Density functional theory (DFT) results demonstrate that NiO/NiCo 2 O 4 /NF exhibits a smaller overpotential than those of single NiO/NF and NiCo 2 O 4 /NF owing to interface-triggered numerous interface charge transfer. Moreover, the superior metallic characteristics of NiO/NiCo 2 O 4 /NF further enhance its electrochemical activity toward OER. Specifically, NiO/NiCo 2 O 4 /NF delivered a current density of 50 mA cm −2 at an overpotential of 336 mV with a Tafel slope of 93.2 mV dec −1 for the OER, which are comparable with those of commercial RuO 2 (310 mV and 68.8 mV dec −1 ). Further, an overall water splitting system is preliminarily constructed via using a Pt net as cathode and NiO/NiCo 2 O 4 /NF as anode. The water electrolysis cell performs an operating voltage of 1.670 V at 20 mA cm −2 , which outperform the Pt net||IrO 2 couple assembled two-electrode electrolyzer (1.725 V at 20 mA cm −2 ). This study proposes an efficient route to acquire multicomponent catalysts with rich interfaces for water electrolysis.
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高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Hao Wu,Ru Xiao,Yu Qiu,Hongzhi Wang
Lithium–sulfur (Li–S) batteries are considered as promising candidates for next-generation energy-storage devices. However, their reaction reversibility is impacted by severe capacity fading caused by the lithium polysulfides (LiPSs) shuttle effect and consequent loss of active materials in the cathode. Typically, light-weight and nonpolar carbon materials are used as hosts of sulfur but face several issues such as short lifetime, low activity and capacity, which limit the cycling stability and volumetric energy density. Herein, fluorine-doped NiCo 2 O 4 nanofibers with oxygen vacancies are explored as a high-performance host in Li–S batteries. By regulating the ratio of the fluoride ion, the formation of a cathode electrolyte interface (CEI) layer is suppressed during the charge/discharge cycles. Accordingly, the nanofiber electrode exhibits lower polarization and faster reaction kinetics than fluorine-doped NiCo 2 O 4 without oxygen vacancies or NiCo 2 O 4 with a CEI layer. The optimized fluorine-doped NiCo 2 O 4 electrode with oxygen vacancies delivers 628 mAh g −1 at 0.3 C and a low fading rate of 0.052% per cycle over 1300 cycles at 1 C. The present strategy provides insights in the development of host materials that is based on regulating the formation of the CEI layer and the adsorption and conversion of LiPSs.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Chunyang Lu,Yangqin Gao,Wei An,Chengcheng Yan,Fengshan Yu,Wenyi Lu,Chunxia Wang,Guoyong Huang
Distinct from the traditional synthesis of NiCo 2 O 4 nanoflowers from hydrothermal approach. Herein a facile gas-liquid diffusion method was exploited to prepare NiCo 2 O 4 and Fe-doped NiCo 2 O 4 nanoflower under ambient condition for oxygen evolution reaction (OER). The remarkable nanoflowers was generated by diffusing ammonia to the homogeneous solution of cobalt and nickel sulfate salt with slight amount of Fe sulfate salt to form a heterogeneous precipitation, followed by pyrolysis to afford the final product of NiCo 2 O 4 or Fe-doped NiCo 2 O 4 . The remarkable feature of NiCo 2 O 4 displays a spherical nanoflower morphology composed of lamellar structure with excellent dispersibility and greatly prompt the electron transfer and enable a high activity. By varying the ratio of Ni to Fe to 9:1, a superior OER performance with overpotential of 256 mV and Tafel slope of 69 mV·dec −1 at 10 mA·cm −2 was obtained. We attribute the superior performance to the excellent gas and ion transport channels due to the unique nanoflower structure as well as the well optimized electronic structure derived from Fe doping. Besides, we tentatively propose a detailed formation process for the formation of this nanoflower structure based on co-precipitation reaction. In conclusion, this approach offers a facile and efficient way for the preparation of high-performance ternary mixed metal oxides nanostructure which enable its large-scale production of OER catalyst.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yuantao Li,Jiajun Zhu,Jiyang Xie,Yongyun Mao,Wanbiao Hu
Constructing three-dimensional (3D) hierarchical bimetallic pseudocapacitive materials with abundant opening channel and heterojunction structures is rather promising but still challenging for high-performance supercapacitors. Herein, a self-sacrifice-template epitaxial growth strategy was proposed for the first time to construct 3D hierarchical bimetallic pseudocapacitive material. By using this strategy, NiCo 2 O 4 nanowires (NiCo 2 O 4 NW) arrayed randomly to form a porous shell via in-situ epitaxial growth fully enclosing a MnO 2 tube core, forming multiple transport channels and nano-heterojunctions between MnO 2 and NiCo 2 O 4 NW, which facilitates electron transfer, i.e. exhibiting high electronic conductivity than any single component. As a result of the self-sacrifice-template epitaxial growth method, special hollow tectorum-like 3D hierarchical structure with considerable inter-nanowire space and hollow interior space enables easy access of electrolyte to NiCo 2 O 4 NW surface and MnO 2 core, thereby resulting in highly exposed redox active sites of MnO 2 core and NiCo 2 O 4 NW shell for energy storage. Comprehensive evaluations confirmed MnO 2 @NiCo 2 O 4 NW was a supercapacitor electrode candidate, delivering a superior energy density of 106.37 Wh kg −1 . Such performance can be ascribed to the synergistic coupling effect of 3D hierarchical tube and nano-heterojunction structures. The proposed self-sacrifice-template epitaxial growth strategy provides important guidance for designing high-performance energy storage materials.
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高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Chunyong Zhang,Jianning Li,Li Shu,Yuyue Zhao,Yiwen Zhang,Yingpin Wen,Hengfei Qin
MOF (metal-organic framework) is an ideal precursor for the synthesis of metal oxides owing to the high porosity and provision of redox sites. This study focused on the formation of NiCo 2 O 4 rod-like nanostructure from Co-MOF by a simple hydrothermal method to overcome disadvantages of MOF such as low electrical conductivity and stability. Noticeably, NiCo 2 O 4 with unique nanostructure could be obtained when the template removed after calcination. It was observed by SEM and TEM, the morphology of NiCo 2 O 4 nanorods with a diameter was about 100 nm. Moreover, the morphology of Co 3 O 4 , which converted from MOF after calcination at 350 °C was similar to hexahedron. The synthesized rod-like NiCo 2 O 4 electrode delivered specific capacitance of 1376 F/g at a current density of 1 A/g, indicating the excellent charge transfer ability in 6 M KOH solution. Therefore, this study presents a hydrothermal method to prepare the electrode materials based on MOF for supercapacitors effectively.
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高影响因子
Journal of Energy Storage
·
2022
·
IF 8.907
Yixiu Xin,Hongen Nian,Xiang Li,Beifeng Zhang,Xiaoling Tan,Jinhong Li,Yongquan Zhou
Structures of matrix channels are essential in the thermal performances of form-stable composite phase change material (fs-CPCM). As the special matrix in fs-CPCM, the expanded graphite (EG) has abundant pores and excellent thermal conduction channels, but it shows poor hydrophilia. In this study, the different dimensional NiCo 2 O 4 was selected to regulate controllably the microstructure of EG channels. Three kinds of NiCo 2 O 4 with one dimensional (1D) pine-needle-like, two dimensional (2D) honeycomb-like and three dimensional (3D) flower-like were used to modify EG (N-EG). A series of novel Na 2 CO 3 ·10H 2 O-Na 2 HPO 4 ·12H 2 O eutectic hydrated salt (EHS)/N-EG fs-CPCM with enhanced heat transfer and excellent thermal stability was developed. It was found that the 3D flower-like N-EG fs-CPCM possessed outstanding chemical compatibility, high latent heat (173.21 J/g), enhanced thermal conductivity (5.52 W/m·K), and great thermal reliability (−0.06 wt% weight loss). This work provides new insights that the matrix with 3D pore structures could be applied to encapsulate EHS, which is beneficial to obtain fs-CPCM with superior thermal properties.
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2021
·
IF 4.641
Jing Zhang,Jiajie Huang,Liang Wang,Peiheng Sun,Peijia Wang,Zhujun Yao,Yefeng Yang
As promising electrode materials for supercapacitors, metal-organic frameworks (MOFs) with rich porosity, large surface area and abundant redox sites have attracted increasing attention. Nevertheless, the intrinsically interior electrical conductivity and ease of agglomeration for most MOFs have largely restricted their energy storage application. In this work, we report the controlled fabrication of bimetallic NiMn-MOF nanosheets on the surface of NiCo 2 O 4 nanowire arrays to form NiCo 2 O 4 @NiMn-MOF core-shell structure and investigate the effect of Mn incorporation in Ni-MOF shell on the electrochemical performance of the hybrid arrays in supercapacitors. Benefitting from the delicately designed structures and compositions, the optimal NiCo 2 O 4 @NiMn-MOF electrode presents an extraordinarily high specific capacity of 243.0 mAh/g at 2 mA/cm 2 . We further assembled a flexible solid-state hybrid supercapacitor with NiCo 2 O 4 @NiMn-MOF and activated carbon as electrodes, exhibiting a high energy density of 48.2 Wh/kg at 1606.7 W/kg, accompanied by excellent mechanical flexibility and electrochemical durability. This work demonstrates a new approach for developing novel MOF array-based electrode materials with boosted electrochemical performance in the field of flexible energy storage devices.
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高影响因子
ENERGY & FUELS
·
2020
·
IF 3.421
Zhoulu Wang,Yingbin Xia,Li Liu,Aoning Wang,Yi Zhang,Xiang Liu
Transition-metal oxides are a prospective anode material for lithium ion battery because of their high theoretical specific capacity. However, the insulating nature of these oxides causes sluggish electron transport, hindering them from reaching theoretical capacity. Herein, we prepared NiCo2O4 nanowires (NiCo2O4 NWs) on carbon papers (CPs) by a hydrothermal method. The structural characterization shows that a large number of NiCo2O4 NWs were aligned on the CPs, forming an interconnected network. This unique architecture could enhance electrical conductivity and accommodate NiCo2O4 expansion during lithiation. Thus, the NiCo2O4 NWs/CPs composite electrode exhibits outstanding capacity and ideal cycling performance. The reversible capacity of the first cycle is 1024.9 mAh g–1 and remains to be 1016.7 mAh g–1 after 200 cycles at 100 mA g–1. Our work provided a high performance anode for lithium ion batteries.
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高影响因子
Nanoscale
·
2020
·Vol. 12
·期 37
·19404-19412
·
IF 6.895
Xi Cao,Yan Sang,Lvxuan Wang,Gaofei Ding,Runhan Yu,Baoyou Geng
Electrocatalytic water decomposition is the key to sustainable energy, and the design and synthesis of cost-effective electrocatalysts is the main objective of electrocatalytic water splitting. In this paper, multi-interfacial FeOOH@NiCo2O4 hybrid nanoflowers are prepared through a two-step hydrothermal reaction. In such heterostructures, NiCo2O4 nanoflowers are coated with a layer of FeOOH nanoparticles. In addition, the obtained electrocatalyst could provide abundant electroactive sites and the formation of FeOOH@NiCo2O4 nanointerfaces can also improve the charge transfer rate. As a result, under the HER and OER conditions, the prepared catalysts show an outstanding electrocatalytic performance. Moreover, in a two-electrode water splitting system, the FeOOH@NiCo2O4 heterostructure, as a dual-function electrocatalyst, needs a cell voltage of only 1.58 V at a current density of 10 mA cm−2. This study provides a facile and feasible method to construct different kinds of heterostructures as bifunctional electrocatalysts with multiple interfaces by a simple hydrothermal method.
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高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
You Zhou,Zhengyong Huang,Jian Li,Huijun Liao,Hanxiang Wang,Yu Wang,Guanglei Wu
A compound electrode of carbonaceous materials and NiCo 2 O 4 is extensively studied because of higher capacitance and better rate capability compared to those of pure NiCo 2 O 4 . However, the tedious preparation process, harsh synthesis condition, high consumption, and especially limited electrochemical property by using modifiers hinder its practical application. Herein, modifier-free electrodes (C/NiCo 2 O 4 ) with various morphologies based on D-ribose are successfully synthesized via a one-step hydrothermal-calcination method. D-ribose concurrently acts as carbon source and structure-directing agent. The structure of NiCo 2 O 4 changes from the nanosheets into nanowires after adding D-ribose. Each element is evenly distributed throughout C/NiCo 2 O 4 , significantly improving the electrical conductivity. Furthermore, there is a strong interaction between carbon and NiCo 2 O 4 , which keeps the structure stable. Benefiting from the structural characteristics, the C/NiCo 2 O 4 composites display the improved electrochemical performance. Remarkably, the maximum specific capacitance of C/NiCo 2 O 4 -2 is 1583.9 F g −1 at 2 A g −1 in 3 M KOH aqueous solution, and it exhibits remarkable rate capability of 1354.8 F g −1 even at 20 A g −1 . After 20,000 charge-discharge cycles at 20 A g −1 , a high capacity retention of 90.6% can be achieved. The C/NiCo 2 O 4 -2 is a promising electrode material for supercapacitor. In addition, a dynamic growth mechanism of C/NiCo 2 O 4 under the coordinate bond of metal ions with D-ribose is discussed in the paper.
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高影响因子
Journal of Energy Storage
·
2020
·
IF 3.762
Doan Tien Phat,Pham Manh Thao,Nguyen Van Nghia,Luong Trung Son,Tran Viet Thu,Ngo Thi Lan,Ngo Quy Quyen,Nguyen Van Ky,To Van Nguyen
In this study, we successfully synthesized NiCo 2 O 4 supported on Ni foam (NNCOs) with different morphologies by changing the synthesis conditions. The research results of electrochemical properties show that the morphologies have a strong influence on the electrochemical properties of materials. Specifically, the nanosheet-like NNCO-1 sample exhibited an enhanced specific capacity of 503.5 C g −1 at current density of 1 A g −1 , ca. 134-350 % higher than that of NNCO-2, NNCO-4 (nanorod-like) and NNCO-3 (grass-like). All materials also show high stability with the ability to maintain 95 to 97% capacitance after 2000 discharge cycles at a current density of 2 A g −1 . We hope that, the NNCO-1 material is promising electrode material for hybrid supercapacitor.
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