Journal of Energy Storage
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2023
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IF 9.4
Xiaolin Sun,Kai Zhao,Hucheng Fu,Hanwen Guo,Jun Shen,Fuhao Jin,Lei Wang,Zihao Wang,Liang Cui,Fengyu Quan,Jingquan Liu
For high-performance electrochemical energy storage and conversion applications, controllable nanoarchitecture arrays of the transition metal selenide on conductive substrates are attractive electrode materials. In this work, a heterostructure comprising of MnSe 2 nanorods over NiCo 2 Se 4 nanosheets with a large specific surface area is rationally generated on nickel foam (NF) substrate (MnSe 2 @NiCo 2 Se 4 ) using a hydrothermal process. The formation mechanism of the MnSe 2 @NiCo 2 Se 4 heterostructure was also examined by adjusting the selenium feeding during the selenization process. The MnSe 2 @NiCo 2 Se 4 -2 electrode exhibits remarkable capacitance (1078C g −1 at 1 A g −1 ), and superior cycle stability (90.7 % after 8000 cycles) as a result of the cooperative effect of MnSe 2 and NiCo 2 Se 4 . Furthermore, an asymmetric supercapacitor (ASC) was developed employing the improved MnSe 2 @NiCo 2 Se 4 -2 and activated carbon materials (AC) as the positive electrode and negative electrode (MnSe 2 @NiCo 2 Se 4 -2//AC), respectively, which has a high energy density of 63.2 Wh kg −1 at a power density of 396 W kg −1 . The impressive performance indicates that the MnSe 2 @NiCo 2 Se 4 electrode has a bright potential in supercapacitors .
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2024
·Vol. 26
·期 16
·2197-2206
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IF 2.6
Miaomiao Wang,Weizhe Liu,Li Zhang,Huanli Liu,Xiao Yang
Transition metal selenide is a typical pseudocapacitive material used in supercapacitor electrodes, but its practical application is restricted due to its insufficient utilization rate of active sites and slow kinetics of redox reaction. Defect engineering can effectively adjust the electronic structure, provide additional intercalation sites, and realize the regulation of energy storage mechanism within the lattice. At present, heteroatom doping is an effective strategy that can provide abundant vacancy defects by introducing heterogeneous atoms, thereby achieving significantly improved electrochemical performance. Based on this, NiCo2Se4 electrode materials with Se vacancies were prepared by P doping for supercapacitors. The double-effect synergy of P doping and vacancy engineering can effectively change the electronic structure and improve the adsorption capacity of ions, which are more prone to redox reactions. The assembled hybrid supercapacitor (NiCo2Sex-P1//AC) has 90.2% capacity retention and 100% coulombic efficiency after 10 000 consecutive charge–discharge cycles, and it exhibits a high energy density of 94.6 W h kg−1 at a power density of 799.9 W kg−1. This provides an effective strategy for constructing high-performance supercapacitors.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
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2024
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IF 5.1
Yue Liu,Xiuyun Ren,Xinfeng Zhou,Di Lan,Zhenguo Gao,Zirui Jia,Guanglei Wu
Vacancy engineering presents an appealing method for modifying the electronic structure of spinel architectures. However, based on well-defined vacancy concentrations, how to design anionic vacancies to modulate electromagnetic parameters as well as electromagnetic wave absorption (EMA) properties is less studied. Here, NiCo 2 Se 4 spinel structures were prepared using different selenization methods, and the Se vacancy defect concentration was controlled by changing the annealing temperature, thus regulating the EMA properties. Among them, the design of the hollow structure effectively enhanced the EMA performance. Moreover, the increase of Se vacancy concentration increases the conductivity loss while regulating the electronic structure, and also acts as an unsaturated site to induce the formation of dipoles to optimize the polarization loss. The effective absorption bandwidth (EAB) of NiCo 2 Se 4 -130 reaches 8.48 GHz at 2.4 mm at the highest Se vacancy concentration. This work establishes a direct relationship between vacancy concentration and the electromagnetic wave dissipation capability, offering valuable insights for the development of advanced EMA materials.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2025
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IF 7.9
Yi-Fei Di,Nan Bu,Jia Li,Jun Xiang,Xin Kang,Dong-Mei Ma,Yi-Bo Wang,Rong-Da Zhao,Fu-Fa Wu
The CoMoO 4 /NiCo 2 Se 4 nanocomposite, synthesized via hydrothermal and vapor deposition methods, demonstrates exceptional multifunctional performance for energy storage and electrocatalysis. As a supercapacitor electrode, it achieves a high specific capacitance of 6445.7 mF/cm 2 at 1 mA/cm 2 and retains 71.4 % capacitance after 5000 cycles, with an energy density of 753.9 μWh/cm 2 at a power density of 75.7 μW/cm 2 , attributed to the synergistic effects between the CoMoO 4 and the conductive NiCo 2 Se 4 . Furthermore, the material exhibits outstanding bifunctional catalytic activity for alkaline water splitting, delivering low overpotentials of 270.6 mV (oxygen evolution reaction) and 177.3 mV (hydrogen evolution reaction) at 50 and 10 mA/cm 2 , respectively, with Tafel slopes of 131.4 and 131.0 mV/dec. The cell voltage of overall water-splitting is 1.46 V (10 mA/cm 2 ) and a high stability performance for 14 h. The CoMoO 4 /NiCo 2 Se 4 not only ensures efficient ion/electron transport but also creates interfacial electronic modulation through heterointerfaces, while the hierarchical nanostructure facilitates electrolyte penetration, collectively advancing energy storage capability, catalytic kinetics, and overall conversion efficiency, thereby underscoring its dual-functional superiority.
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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催化化学
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纳米科技
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功能材料
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电化学能量转换
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 12
·6241-6247
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IF 7.79
Huan Wang,Zhonghua Sun,Xiaoran Zou,Jianhai Ren,Chun-yang Zhang
The rational construction of heterointerfaces in hollow nanohybrids is considered as a promising and challenging approach for enhancing their electrocatalytic performance. Herein, we demonstrate the synthesis of CoFe2Se4/NiCo2Se4 hybrid nanotubes (CFSe/NCSe HNTs) with open ends and abundant heterointerfaces. The CFSe/NCSe HNT hybrid nanotubes are obtained by using NiCo2-aspartic acid nanofibres (NiCo-Asp NFs) as the templates which can be converted to the CFSe/NCSe HNTs via proton etching, three metal coprecipitation, Kirkendall effect and anion-exchange reaction. The CFSe/NCSe HNTs may function as the oxygen evolution reaction (OER) electrocatalysts, and they exhibit a low overpotential of 224 mV at a current density of 10 mA cm−2 and outstanding stability with only 1.4% current density change even after 15 h, superior to those of the reported single-component counterparts. The obtained density of states and differential charge density confirm the existence of a heterointerface which can induce the accumulation of electrons at the interface of CFSe–NCSe and consequently increase the carrier density and electrical conductivity of the CFSe/NCSe HNTs. This research provides a new avenue for the fabrication of hollow nanohybrids with heterointerfaces.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
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2020
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IF 6.215
Keke Wang,Zongshan Lin,Yun Tang,Zhenghua Tang,Chun-Lan Tao,Dong-Dong Qin,Yong Tian
Rational design and constructing multifunctional electrocatalysts featuring with low cost and high efficiency is critical for promoting the implement of sustainable energy devices such as water splitting and zinc air batteries. Herein, we report a facile means to prepare a selenide/sulfide hetero-structured NiCo 2 Se 4 /NiCoS 4 catalyst for oxygen evolution reaction (OER), hydrogen evolution reaction (HER), overall water splitting (OWS), and Zn-air batteries (ZABs). The NiCo 2 Se 4 /NiCoS 4 heterostructure showed excellent OER and HER performance, evidenced by the small overpotential of 248 mV and 180 mV @ 10 mA cm −2 for OER and HER, and superior long-term stability to the benchmark IrO 2 and Pt/C catalyst for OER and HER, respectively. It also exhibited a potential of 1.660 V @ 10 mA cm −2 in the practical OWS test, close to the Pt/C + IrO 2 catalyst. Furthermore, when employed as air-cathode catalyst for ZABs, the NiCo 2 Se 4 /NiCoS 4 modified battery exhibited the narrow charge-discharge voltage gap of 0.98 V @ 50 mA cm −2 and a maximal specific capacity of 693.17 mA h g −1 , outperforming the IrO 2 counterpart. Such excellent performance can be attributed to the advantageous structural merit of the NiCo 2 Se 4 nanoflowers, and especially the heterostructure interfaces created in NiCo 2 Se 4 /NiCoS 4 , which significantly boosted the catalytic synergistic effects. This study can offer a new avenue to design and prepare abundant-element-based cost effective, efficient and durable electrocatalysts with multifunctionalities that hold great promises to be applied in electrochemical devices.
研究领域:
材料科学
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电化学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Materials
·
2022
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IF 3.985
Fan Jinchen,Zheng Yujun,Zhao Zhongshu,Guo Wenyao,Zhu Sheng
Bimetallic selenides are considered to be the promising high-capacity anode materials for potassium ion batteries (PIBs). However, the dramatic volume fluctuation of K+ ions and pulverization during cycling still limit their practical application in PIBs. Herein, the nitrogen, phosphorus, and sulfur tri-doped carbon (SPNC)-coated bimetallic NiCo2Se4 needle arrays grown on carbon cloth (NiCo2Se4⊂SPNC/CC) prepared as a binder-free anode for PIBs. The polyphosphazene (PSZ) was used as ingenious heteroatoms doping carbon source. The coated SPNC layer derived from the PSZ on the surfaces of NiCo2Se4 needle arrays not only effectively alleviate the volume expansion of NiCo2Se4 but also provide abundant active sites for the storage of K+ ions. As the PIB anode, the NiCo2Se4⊂SPNC/CC could deliver a high reversible capacity of 880.9 mA h g−1 at a current density of 0.1 A g−1. After 500 cycles, the NiCo2Se4⊂SPNC/CC anode still maintains a high reversible capacity of 268.1 mA h·g−1 at a current density of 0.5 A g−1.
研究领域:
材料科学
·
电化学
✓ 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）