JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Jinhe Wei,Fei Hu,Xiong Shen,Bingkun Chen,Lin Chen,Zhongming Wang,Chenglong Lv,Qiuyun Ouyang
The roles of oxygen vacancies to enhance the electrochemical performance were not clearly explained in comprehensive research. Herein, the vertically oriented NiCo 2 S 4 /MnO 2 core–shell nanocomposites are in situ grown on the nickel foam (NF) surface and activated by oxygen vacancy engineering via a chemical reduction method. The scanning electron microscope (SEM) and transmission electron microscope (TEM) results show the shell-MnO 2 is well coated on the core-NiCo 2 S 4 . The hierarchical core–shell nanostructures synergistically increase conductivity and provide rich faradaic redox chemical reactions . Moreover, the density functional theory (DFT) calculations further indicate that the electronic properties and structure properties in NiCo 2 S 4 /MnO 2 electrode of reduction for 60 min (NiCo 2 S 4 /MnO 2 -60) are effectively adjusted by introducing oxygen vacancies. Impressively, the NiCo 2 S 4 /MnO 2 -60 electrode delivers substantially appreciable areal capacity of 2.13 mAh·cm −2 couple with superior rate capability. The as-prepared high-performance electrode material can assemble into solid-state hybrid supercapacitor . The fabricated NiCo 2 S 4 /MnO 2 -60//AC device exhibits an exceptional energy density of 43.16 Wh·kg −1 at a power density of 384.21 W·kg −1 and satisfactory cyclic stability of 92.1 % at current density of 10 mA·cm −2 after 10,000 cycles. In general, the work demonstrates the significance of NiCo 2 S 4 /MnO 2 -60 as a highly redox active electrode material for future practical application in supercapacitors .
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Xinrui He,Yi Niu,Hailong Sun,Xing Chen,Zhirong Wang,Jing Jiang,Chao Wang
Transition-metal phosphides are desirable candidates for supercapacitors . Herein, bimetallic phosphides NiCoP/CC is obtained with 3D nano-micro structure. This unique as well as the altered electronic structure effectively improved the energy density of NiCoP/CC//AC hybrid supercapacitors (HSCs). As compared to Ni 2 P/CC, NiCoP/CC shows a metallic conductivity and has more electrons close to the Fermi level, increasing the intrinsic reactivity effectively. Moreover, the 3D nano-micro structure with a 20 nm staggered nanosheet provides a multidirectional pathway for charge transfer. Thus, NiCoP/CC cathode holds the capacity of 3.42 C cm −2 at 4 mA cm −2 , which is much higher than that of Ni 2 P/CC. As a result, the HSC device delivers a greater energy density of 31.8 Wh kg −1 than that of most reported devices. More importantly, the device works well over a wide temperature range. It can still maintain 100% of its initial capacity after 450 cycles under variable temperatures from 5 ℃ to 50 ℃. In summary, this work starts with structural engineering and then analyzes the performance of HSC under variable temperature environments, offering a universal approach for the rational development of high-performance electrode materials in the field of supercapacitors.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2023
·Vol. 26
·期 4
·468-474
·
IF 3.1
Fengming Zhou,Xiaodong Wang,Zheng Lv,Xiaoyu Li,Qi Zhang,Zhenjiang Li,Yujing Zhu,Lei Wang,Zhenyu Xiao
Inspired by morphological control and element doping, nanorod NFS-X ((NiFe)9S8 with different Ni : Fe molar ratios) was synthesized by a hydrothermal method. In this work, uniform and dense NF-X (X = 0, 1, 3, 5, 7, 9 and 10) materials were prepared on NiFe foam, and as a precursor, the nanorod was formed in situ by sulfurization in ethanol. NFS-X (X = 0, 1, 3, 5, 7, 9 and 10) with nanorod morphology was successfully obtained by controlling the Ni and Fe ratio. The optimized NFS-3 has a unique nanorod structure, which provides abundant electrochemical active sites and sufficient electron and electrolyte migration paths for fast and deep Faraday reactions. A specific capacitance of 3620 mF cm−2 at 2 mA cm−2 was obtained with significant cycling performance (83.3% retention after 7000 cycles at 20 mA cm−2). Furthermore, asymmetric supercapacitor CNHC//NFS-3 was prepared by using NFS-3 nanorods as a cathode and double-shell layer Co/Ni-based alkaline carbonate (CNHC) as an anode. The device presents an excellent energy density of 68.9 Wh kg−1 at a power density of 0.74 kW kg−1 while driving a small fan for operation, exhibiting potential for practical applications.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Keying Cui,Lange Du,Weimin Du,Weiling Chen,Yufan Zhang,Lili Cui,Dapeng Wu
CoTe@NixSy core-shell nanowires are designed and grown on cobalt foams via hydrothermal and electrodeposition method. Structural characterizations indicate the tightly coating of NixSy nanosheets around CoTe nanowires forms the novel core-shell nanowires. Benefiting from this structural engineering design, CoTe@NixSy core-shell nanowires supported by cobalt foams deliver the high areal specific capacitance of 7.56 F cm −2 at 3 mA cm −2 and retention rate of 81.3% after experiencing 5000 cycles. It needs to be specially mentioned that CoTe@NixSy core-shell nanowires were functionally applied in aqueous/flexible hybrid supercapacitors with activated carbon as the negative materials. The aqueous hybrid devices exhibit a maximum areal energy density of 0.77 mWh cm −2 at 2.52 mW cm −2 and retention rate of 81.9% after 5000 cycles. Meanwhile, the flexible hybrid devices show superior energy-storage performance, such as high volume energy density of 3.95 mWh cm −3 at 22.64 mW cm −3 , improved cycle stability (82.1% after experiencing5000 cycles), and remarkable flexibility. This work not only demonstrates CoTe@NixSy core-shell nanowires as the promising candidate of energy-storage device; but also provides a novel strategy for high-performance electroactive materials.
研究领域:
材料科学
·
能源存储技术
·
结构工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Zhenyuan Ji,Guanxiang Tang,Lizhi Chen,Jiali Zhong,Yao Chen,Guoxing Zhu,Xinghang Chuan,Jingchuang Zhang,Xiaoping Shen
Defect engineering, such as introducing heteroatoms and vacancies into the electrode materials, provides a feasible strategy for boosting the electrochemical characteristics of hybrid supercapacitors. In this work, hollow N, S co-doped carbon (HNSC) spheres with high specific surface area are fabricated through the carbonization-etching process. Thanks to the unique porous architecture and multiple heteroatoms doping, the obtained HNSC electrode achieves an excellent capacitance of 330.4 F g −1 at 1 A g −1 and superior capacitance retention of 97 % after 10,000 cycles in 6 M KOH. Subsequently, the Co 3 S 4 nanoparticles with controllable sulfur vacancies (Vs-Co 3 S 4 ) are homogeneously deposited on the HNSC skeleton by a facile chemical reduction strategy. The fabricated Vs-Co 3 S 4 /HNSC cathode exhibits a compelling electrochemical capacity of 497.2 C g −1 at 1 A g −1 and a prominent cycle life of 98.1 % after 10,000 cycles in 6 M KOH. Noticeably, benefiting from the defects regulation and unique structures of HNSC and Vs-Co 3 S 4 /HNSC, the constructed hybrid supercapacitor of V S -Co 3 S 4 /HNSC//HNSC reaches a marvelous energy density of 71.4 Wh kg −1 at 925.3 W kg −1 with only 8.1 % capacity loss within 15,000 cycles at 10 A g −1 . Such eminent electrochemical features inspire the rational design of advanced defect-modulated electrode materials for energy storage applications.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Xuemin Yin,Hejun Li,Haiqi Wang,Zhiyong Zhang,Ruimei Yuan,Jinhua Lu,Qiang Song,Jian-Gan Wang,Leilei Zhang,Qiangang Fu
Prussian blue (PB) and its analogues (PBA), especially with hollow structures, have attracted growing attention from the researchers of energy storage field. Herein, we have developed a facile self-templating method to synthesize hollow-structured cobalt hexacyanoferrate (CoHCF) with controllable morphologies by using water-soluble precursors as templates. The method is versatile and can be extended to synthesize various PB/PBA hollow structures with tunable composition and morphology. Profiting from the unique hollow structure, the CoHCF hollow prisms manifest exceptional electrochemical performance in the Na2SO4 aqueous electrolyte, including a high specific capacitance (284 F g–1 at 1 A g–1), a high rate capability, and an excellent cycling stability (92% retention after 5000 cycles). A hybrid supercapacitor device assembled with the CoHCF hollow prisms and activated carbon shows a high specific density of 47 W h kg–1 at a specific power of 1000 W kg–1 and stable cycling performance.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
IONICS
·
2020
·Vol. 27
·期 1
·351-360
·
IF 2.394
Wang Jia,Rui Jiayi,Yin Jingzhou,Zhou Guolang,Zhu Lili,Wang Hao,Zhao Pusu,Zhang Lili
Two-dimensional Mg-substituted cobalt hydroxides (Co x Mg y (OH) z ) with different crystal phases were synthesized via a facile reaction of magnesium (Mg) powder and cobalt aqueous solution. The phases of Co x Mg y (OH) z (amorphous phase and β phase) were controlled by adjusting the cobalt salt precursors. The obtained hybrid amorphous Co x Mg y (OH) z (a-Co x Mg y (OH) z ) showed excellent specific capacitance (662.2 F g −1 , 1 A g −1 ) than β phase Co x Mg y (OH) z (β-Co x Mg y (OH) z ) and pure Co(OH) 2 (p-Co(OH) 2 ). Additionally, the hybrid supercapacitor assembled with a-Co x Mg y (OH) z and the activated carbon showed high specific capacitance (77.8 F g −1 , 1 A g −1 ) and ultrahigh cycling stability with 99.7% retention of the first capacitance at 10 A g −1 after 5000 cycles.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Zhenyuan Ji,Na Li,Yifei Zhang,Minghua Xie,Xiaoping Shen,Lizhi Chen,Keqiang Xu,Guoxing Zhu
Owing to their unique electronic properties and capability to host diverse functional groups on the surface, carbon dots (CDs) have attracted increasing attention in energy storage field. Herein, ultrathin nitrogen-doped carbon dots (NCDs) decorated nickel hydroxide (Ni(OH) 2 ) nanosheets were fabricated by a facile hydrothermal approach, where NCDs play an important role as a structure-directing agent in tuning the size and thickness of the Ni(OH) 2 . With the merits of the battery-type faradaic behavior of Ni(OH) 2 and high electronic properties of NCDs, the achieved Ni(OH) 2 /NCDs ultrathin nanosheets show a specific capacitance of about 1711.2 F g −1 at a current density of 1 A g −1 , which is twice more than that of pristine Ni(OH) 2 . A hybrid supercapacitor device was constructed using Ni(OH) 2 /NCDs ultrathin nanosheets as the positive electrode and three-dimensional graphene (3DGE) as the negative electrode, respectively, which presents high energy density of 23.8–34.6 Wh kg −1 at power density of 700–7000 W kg −1 . The enhanced electrochemical properties of Ni(OH) 2 /NCDs nanocomposite hold potential for future high-performance energy storage applications.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Leyi Wang,Wenbin Jian,Zhu Jiang,Bingchi Wu,Xihong Zu,Gaixiu Yang,Wenli Zhang,Xueqing Qiu
Zinc-ion hybrid supercapacitors is a new type of electrochemical energy storage device that could realize high power density and high energy density . However, porous carbon cathode has a high cost of production due to the expensive precursors and excessive consumption of activation agents. Here, a hierarchical porous carbon was prepared by one-step carbonization of lignocellulose-based hydrogels containing alkaline activation agent. This strategy enables the activation agent to be uniformly dispersed in the lignocellulose precursor, which effectively utilizes the activation agent and thus reduces the amount of the activation agent (w(KOH)/w(precursor) <1). Moreover, the porous carbon could partially retain the macroporous and mesoporous structures formed in the lignocellulose-based hydrogel. The obtained porous carbons feature abundant mesopores (average pore sizes of ∼2.0 nm and mesopore ratio of 15.0 % – 79.8 %) and high specific surface areas (1358–1819 m 2 g −1 ). The zinc-ion hybrid supercapacitors with an obtained porous carbon cathode displayed a specific capacitance of 292.4 F g −1 , high rate capability, and long cycle stability (95.4 % capacitance retention after 12,000 cycles at 2 A g −1 ). In addition, we found that the pores larger than 0.65 nm could improve the storage efficiency of zinc ions.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2021
·
IF 4.311
Lin Sun,Yu Liu,Ming Yan,Weijing Liu,Xiaoying Liu,Weidong Shi
Reasonable structures are beneficial to improve the electronic transfer efficiency of the electrode. A novel two/three-dimensional structure with multiphase CoSe 2 (M-CoSe 2 ) nanoboxes fixed on CoAl-LDH nanoflowers on carbon paper (CP) is reasonably designed. The formation mechanism of M-CoSe 2 is systematically studied through the gradient change of the selenization conditions. Benefitting from the hollow structure of the ZIFs derivatives (carbon-nitrogen frameworks, CNFs), numerous charge transfer channels are provided. Furthermore, M-CoSe 2 with enhanced conductivity can furnish abundant active sites and a synergistic effect. The specific capacity of the optimal anode M-CoSe 2 /CNFs/CoAl-LDO/CP can reach 343.6 mAh g −1 at 1 A g −1 , which is equivalent to twice that of the monomer material. The hybrid-supercapacitor (M-CoSe 2 /CNFs/CoAl-LDO/CP//activated carbon) can provide a high energy density of 50.8 Wh kg −1 at 800 W kg −1 , and high stability (capacity loss rate of 3.2%, 10,000 cycles). Besides, LEDs can be lit by HSCs, demonstrating their application potential.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
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.
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
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Yue Liu,Dong Su,Zhiyuan Sang,Xiaohan Su,Han Chen,Xiao Yan
The rapid development of portable and wearable electronic devices requires novel energy storage devices. Flexible, high-performance electrode materials are critical for meeting the demands yet remain challenging. Here, a rationally designed flexible NiCo 2 S 4 @rGO/rGO film constructed with NiCo 2 S 4 @rGO frameworks is successfully prepared through a step-wise process (hydrothermal, freeze-drying, vacuum filtration, and then sulfurization/reduction). The NiCo 2 S 4 @rGO/rGO film as flexible electrode shows typical battery-type faradaic redox features and exhibits a high specific capacitance of 1100.0 F g −1 at 1 A g −1 , a good rate performance of 89.1% capacity retention at 10 A g −1 coupled with long cycling stability of 90.2% after 5000 cycles. The good electrochemical performance is mainly attributed to the loose layered structure and strong interaction between NiCo 2 S 4 and rGO nanosheets , which enhance the diffusion of electrolyte ions/electrons and decreases intrinsic resistance and contact resistance. A flexible hybrid supercapacitor assembled using the NiCo 2 S 4 @rGO/rGO film as cathode and the rGO film as anode shows a high energy density of 30.0 Wh kg −1 at a power density of 857.6 W kg −1 at an extended operating voltage of 1.8 V. The method can also be readily adapted for loading other bimetallic sulfides on rGO films, indicative of its feasibility and flexibility to prepare rGO-based hybrid film for high-performance flexible electrochemical energy storage .
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）