ENERGY & FUELS
·
2021
·
IF 3.605
Zhihui Xu,Xuelei Li,Shishuai Sun,Zepeng Wei,Hongguo Li,Shougen Yin
The synergistic effect of the electrochemical double-layer and pseudocapacitance electrode materials has been extensively used to improve the performance of composite electrodes for supercapacitors (SCs). However, the energy density of SCs is still unsatisfactory for practical utilization. Herein, a C-NiCo2O4/C@Ni–Co–S electrode is ingeniously devised through coupling the interior of 0D/2D carbon-modified NiCo2O4 and the external sheath of Ni–Co–S nanosheets. The 0D carbon quantum dot doping can effectively avoid the agglomeration of NiCo2O4 nanoparticles and improve the electronic conductivity. 2D carbon as the intermediate layer can ameliorate the physical/chemical stability of the electrode. Ni–Co–S nanosheets can improve the area-specific capacitance of the electrode and thus enhance the energy density of the device. As expected, the C-NiCo2O4/C@Ni–Co–S electrode delivers an outstanding specific capacitance of 2396 F g–1 (7.9 F cm–2) at 3 A g–1 and excellent cycling stability (92% after 10 000 cycles). Furthermore, a quasi-solid-state asymmetric supercapacitor (ASC) using C-NiCo2O4/C@Ni–Co–S as positive electrode and active carbon (AC) as negative electrode exhibits a high energy density of 95 Wh kg–1 at 0.9 kW kg–1 and an excellent cycle performance. Our work reveals that this reasonable structure design is very effective for achieving a high-performance positive electrode for practical SC 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
POLYHEDRON
·
2018
·
IF 2.067
Dejuan Fa,Mao Zhou,Hui Zhao,Yiwei Jiang,Yuqing Miao
The 3D flower-like Ni–Co–S was synthesized by a typical hydrothermal method in the presence of urea and thioacetamide. As comparison, the urchin-like Ni–Co–O was prepared in the absence of thioacetamide. The former processed higher electrocatalytic activity for methanol oxidation than the latter. Ni–Co–S exhibited the anodic peak current density of 19.23 mA/cm 2 for methanol oxidation, far higher than Ni–Co–O. It also showed the Tafel slopes of 57 mV/dec, much lower than Ni–Co–O. The BET results showed that the surface area and pore volume are 96.373 m 2 /g and 0.367 cm 3 /g for the flower-like Ni–Co–S, which is higher than 88.736 m 2 /g and 0.224 cm 3 /g for the urchin-like Ni–Co–O. As a result, the flower-like Ni–Co–S possessed more electroactive sites for methanol oxidation. The superhydrophobicity of the flower-like Ni–Co–S helps for the formation of micro air film on the surface of flower petals. Such a tri-phase interface of Ni–Co–S solid, reaction solution and air film may help for the electrocatalytic oxidation of Ni–Co–S toward methanol oxidation since the produced CO 2 can leave the surface of Ni–Co–S quickly and enter into solution phase due to the presence of air film and high solubility of CO 2 in aqueous solution.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
NANO
·
2019
·
IF 1.293
Yanwei Sui,Man Zhang,Haihua Hu,Yuanming Zhang,Jiqiu Qi,Fuxiang Wei,Qingkun Meng,Yezeng He,Yaojian Ren,Zhi Sun
The interconnected three-dimensional Ni–Co–S nanosheets were successfully deposited on ZnO nanorods by a one-step potentiostatic electrodeposition. The Ni–Co–S nanosheets provide a large electrode/electrolyte interfacial area which has adequate electroactive sites for redox reactions. Electrochemical characterization of the ZnO@Ni–Co–S core–shell nanorods presents high specifc capacitance (1302.5 F/g and 1085 F/g at a current density of 1 A/g and 20 A/g), excellent rate capabilities (83.3% retention at 20 A/g) and great cycling stability (65% retention after 5000 cycles at a current density of 30 A/g). The outstanding electrochemical performance of the as-prepared electrode material also can be ascribed to these reasons that the special structure improved electrical conductivity and allowed the fast diffusion of electrolyte ions.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Bo Yu,Guohua Jiang,Wangcong Xu,Cong Cao,Yongkun Liu,Na Lei,Uwamahoro Evariste,Pianpian Ma
The NiMoO 4 /CoMoO 4 nanorod arrays wrapped by Ni-Co-S nanosheets were successfully grown on the surface of carbon cloth (NCMOS@CC) by combining of hydrothermal and electrochemical deposition methods. And the as-prepared NCMOS@CC showed good flexibility. The obtained NCMOS@CC as electrode materials were tested in a three-electrode system, showing a pretty good specific capacitance of 778.1 F g −1 at a current density of 0.5 A g −1 and excellent rate capability using 1 M KOH as the electrolyte. The flexible asymmetric supercapacitors (FASCs) were further fabricated using NCMOS@CC as the positive electrode and activated carbon@carbon cloth (AC@CC) as the negative electrode. The fabricated FASCs exhibited a safe working range with a potential window of 0–1.6 V with a maximum energy density of 33.1 Wh Kg −1 at 0.25 A g −1 and maximum power density of 3195 W kg −1 at 4 A g −1 . The fabricated FASCs even bent at different angles still showed good flexibility and stable electrochemical properties . These performances enable the NCMOS@CC to be one of the potential flexible electrodes for using in flexible energy storage devices.
研究领域:
材料科学
·
能源存储技术
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2019
·Vol. 34
·期 14
·2445-2455
·
IF 1.982
Uwamahoro Evariste,Guohua Jiang,Bo Yu,Yongkun Liu,Zheng Huang,Qiuling Lu,Pianpian Ma
In this work, hierarchical mesoporous Zn–Ni–Co–S–rGO/NF microspheres have been prepared by hydrothermal, sulfurization, and subsequent calcination process. The effect of different sulfurization time on the morphology and capacitance of composites was tested. The high electrochemical performance of (Zn–Ni–Co–S–rGO/NF) composite was obtained when the sulfurization time was 3 h (Zn–Ni–Co–S–rGO/NF-3h), where a specific capacitance of 627.7 F/g at 0.25 A/g and excellent rate capability of about 97.8% capacitance retention at 2 A/g after 4000 cycles were achieved. Moreover, an asymmetric supercapacitor fabricated by (Zn–Ni–Co–S–rGO/NF-3h) composite and activated carbon (AC) as the positive and the negative electrodes, respectively, showed a high energy density of 75.96 W h/kg at a power density of 362.49 W/kg with a remarkable cycle stability performance of 91.2% capacitance retention over 5000 cycles. This incredible electrochemical behavior illustrates that the hierarchical mesoporous Zn–Ni–Co–S–rGO/N-3h microsphere electrodes are promising electrode materials for application in high-performance supercapacitors.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Jianhua Yu,Xiancai Pang,Qunchao Yin,Di Chen,Hongzhou Dong,Qian Zhang,Jing Sui,Lina Sui,Lifeng Dong
Constructing self-supporting porous electrode material with abundant electrochemical active sites can effectively improve the energy storage capacity of supercapacitors . Herein, a novel electrode material (NCS@Co-ZIF/NF) is developed by depositing zeolitic imidazolate frameworks (Co-ZIF) on nickel foams (NF), which is adopted as a precursor (Co-ZIF/NF) to electrodeposit nickel-cobalt sulfides (NCS). The nanosheet arrays with cross-porous structures provide NCS@Co-ZIF/NF with excellent electrochemical characteristics, including a high specific capacity of 144.4 mAh g −1 at the current density of 1 mA cm −2 , 60.5% capacity retention at 50 mA cm −2 , and superb long-term cycle stability. Furthermore, NCS@Co-ZIF/NF//AC hybrid supercapacitor is fabricated by using NCS@Co-ZIF/NF as positive electrodes and activated carbon (AC) as negative electrodes , which exhibits a high energy density of 33.9 Wh kg −1 at a power density of 145 W kg −1 .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 48
·33917-33925
·
IF 10.7
Yi Ma,Luming Li,Jialing Tang,Zongkun Hu,Yong Zhang,Huan Ge,Ning Jian,Jun Zhao,Andreu Cabot,Junshan Li
Plastics have become an integral part of modern society due to their excellent mechanical properties, light weight, chemical stability and low cost. However, their continuous production and use worldwide have resulted in a major environmental problem. In this context, the green degradation and upcycling of waste plastics using electrochemical oxidation present a promising solution. To make this solution practical, the development of cost-effective catalysts optimized for this reaction is essential. In this study, we propose a new catalyst for the electrocatalytic reforming of ethylene glycol (EG) derived from polyethylene terephthalate (PET) to formic acid. The catalyst comprises layered Ni–Co9S8 nanosheet arrays (NSAs) grown on nickel foam (NF) via the hydrothermal method. Under EG oxidation reaction (EGOR) conditions, the Ni–Co9S8 NSAs/NF catalyst achieves Faraday efficiencies (FEs) of up to 92%. Additionally, the direct use of commercial PET plastic powder hydrolysate still enables formate FEs to exceed 90%. These outstanding results are rationalized using density functional theory (DFT) calculations providing insights into the role of the different elements in the EGOR. Overall, this study demonstrates both a synthetic strategy for transition metal sulfides and an efficient and sustainable strategy for the upgraded recycling of PET plastics.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Ling Wang,Wenzong Liu,Thangavel Sangeetha,Zechong Guo,Zhangwei He,Chuan Chen,Lei Gao,Aijie Wang
High overpotential and soaring prices of the cathode electrode are the bottlenecks for the development of microbial electrolysis technology for hydrogen production . In this study, a novel one-step electrodeposition method has been attempted to fabricate electrodeposited cathodes in situ growth of Ni–Co–S, Ni–S, Co–S catalyst on nickel foam (NF) to reduce the overpotential of electrodes. Finally, a uniform nanosheet with a high specific surface area and more active sites is formed on the NF surface, resulting in a lower overpotential than plain NF. At 0.8 V, the Co–S/NF cathode produces a favorable 42% increase in hydrogen yield (0.68 m 3 ·m −3 ·d −1 ), 40% upsurge in current density (10.6 mA/cm 3 ) and 39% rise of cathodic recovery rate (58.0 ± 3.2%) than bare NF, followed by Ni–Co–S/NF and Ni–S/NF cathode. All the electrodeposited electrodes demonstrate enhanced current density and reduced electron losses, thereby achieving efficient hydrogen production . These innovative varieties of electrodes are highly advantageous as they are relatively inexpensive and easy to manufacture with great potential in reducing costs and further real time application in large scale.
研究领域:
生物电化学
·
材料科学
·
可再生能源
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Yongkun Liu,Qiuling Lu,Zheng Huang,Shiqing Sun,Bo Yu,Uwamahoro Evariste,Guohua Jiang,Juming Yao
In this work, a novel flexible electrode material for supercapacitor is prepared by electrodeposition of Ni-Co-S interconnected nanosheet arrays on N-doped hierarchical porous carbon nanofibers (Ni-Co-S@N-pCNFs). The electrode exhibits a remarkable specific capacitance of 520.2 F g -1 at the current density of 0.2 A g −1 and 670 F g -1 at 2 mV s −1 . The activated charcoal (AC) loaded N-doped porous carbon nanofibers (AC@N-pCNFs) as electrode is also prepared which exhibits a specific capacitance of 257.2 F g -1 at 0.2 A g −1 , as well as excellent cycling stability with a capacitance retention of 92.6% after 5000 cycles. Furthermore, the Ni-Co-S@N-pCNFs as the positive electrode , active carbon loaded N-doped hierarchical porous carbon nanofibers (AC@N-pCNFs) as negative electrode , and KOH/NKK hybrids as both the electrolyte and separator are assembled into flexible asymmetric supercapacitor . The assembled supercapacitor device without using any current collectors or binders shows a high energy density of 21.6 Wh·kg −1 at a power density of 134.9 W kg −1 and robust long-term cycling stability retaining over 90.0% after 3000 cycles at 1.0 A g −1 . The as-assembled asymmetric supercapacitors (ASCs) have an outstanding mechanical flexibility and electrochemical stability and no significant attenuation occurred during cycling under different bending states.
研究领域:
材料科学
·
电化学
·
纳米能源
·
储能器件
·
功能材料
✓ 已验证
DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2021
·Vol. 33
·期 6
·3272-3276
·
IF 6.779
Na Li,Guangmeng Qu,Xixi Zhang,Shunshun Zhao,Chenggang Wang,Gang Zhao,Peiyu Hou,Xijin Xu
The selection and development of cathode of alkaline zinc batteries (AZBs) is still hindered and often leads to poor rate capability and short cycle life. Here, amorphous hollow nickel-cobalt-based sulfides nanocages with nanosheet arrays (AM-NCS) are designed and constructed with ZIF-67 as the self-template to exchange with Ni 2+ and S 2− by using a two-step ion exchange method. The synthesized AM-NCS possess the high specific capacity (160 mAh/g at 2 A/g), and the assembled battery has excellent rate performance (146 mAh/g reversible capacity at 5 A/g). The assembled device has excellent rate performance (155 mAh/g at 2 A/g) and long cycling stability (7000 cycles, 62.5% of initial capacity). The excellent electrochemical properties of the electrode materials are mainly attributed to the unique structure, in particular, polyhedron structure with hollow structure can improve the cyclic stability, and the amorphous structure can expose more reactive sites on the surfaces of nickel, cobalt and sulfur. This work provides a new strategy for the design and fabrication of high performance cathode materials for AZBs.
研究领域:
储能
·
材料科学
·
电化学
·
纳米材料
✓ 已验证
DOI
高影响因子
SYNTHETIC METALS
·
2017
·
IF 2.435
Hongxiu Dai,Pengfei Cao,Duo Chen,Yuan Li,Nan Wang,Houyi Ma,Meng Lin
A nickel-cobalt-sulfide nanosheet (Ni-Co-S NS)/polypyrrole nanowire (PPy NW) core/shell-structured composites on nickel foam (NF) was synthesized by facile electrodeposition processes for electrochemical non-enzymatic glucose sensor. PPy NWs grew on the NF substrate by a potentiostatic deposition method, and then the PPy NWs were further served as skeletons for electrodeposition Ni-Co-S nanosheets. The ternary Ni-Co-S NSs as the shell and PPy NWs as the core on the flexible NF constructed the 3D micro/nano structure. The as-prepared Ni-Co-S/PPy/NF electrode was characterized by scanning electron microscopy (SEM) and energy-dispersive X-ray spectrometer (EDS). The electrochemical sensor was used for the detection of glucose by chronoamperometry. The introduction of the interconnected Ni-Co-S NSs can provide accessible pathways for electrolyte and have high sensitivity to glucose. Compared with the NF and PPy/NF electrodes, the Ni-Co-S/PPy/NF micro/nanohybrid electrode exhibited higher catalytic activity towards electro-oxidation of glucose. The developed Ni-Co-S/PPy/NF electrode showed two linear electrochemical responses to glucose in the range from 2 μM to 140 μM with a correlation coefficient of R 2 = 0.937 and 0.14 mM to 2 mM with a correlation coefficient R 2 = 0.978, and the detection limit is 0.82 μM. Furthermore, the prepared biosensor demonstrated high selectivity to glucose in the presence of uric acid, ascorbic acid and D-fructose.
研究领域:
材料科学
·
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Fei Ma,Xiaoqiang Dai,Jie Jin,Ning Tie,Yatang Dai
Despite cobalt molybdenum sulfide (CoMoS 4 )-based materials are a prospective class of electrode material for supercapacitors , their relatively inferior rate capability and cyclic stability have severely restricted practical applications. Engineering multicomponent binder-free electrode material is deemed an effective approach to fulfill the demand of high-performance supercapacitors. Herein, the hierarchical core-shell hollow CoMoS 4 @Ni–Co–S nanotubes supported on flexible carbon cloth are designed through a scalable hydrothermal method combined with electrodeposition process. Due to the synergistic contribution of highly conductive CoMoS 4 nanotubes core and highly active nickel cobalt sulfide nanosheets shell, the 3D hierarchical CoMoS 4 @Ni–Co–S nanotubes electrode achieves a remarkable specific capacitance of 2208.5 F g −1 at a rate of 1 A g −1 and extraordinary cycling life (91.3% capacitance retention over 5000 cycles at 3 A g −1 ). Moreover, the assembled CoMoS 4 @Ni–Co–S//activated carbon (AC) asymmetric supercapacitor presents satisfactory electrochemical performance, delivering an energy density of 49.1 W h kg −1 at a high power density of 800 W kg −1 and competitive cyclic stability (90.3% retention of initial capacity after 10000 cycles). This work designs an effective synthetic route and validates the potential prospects of binder-free 3D hierarchical architecture for developing high-performance and advanced energy storage devices.
研究领域:
材料科学
·
能源存储技术
·
纳米技术
✓ 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）