PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
·
2021
·Vol. 218
·期 22
·2100377
·
IF 1.981
Pan Liu,Sumin Wang,Yufei Quan,Zhiruo Shen,Qiguan Wang
2D composited nanosheets of Mo 2 C/CoMoS 4 are synthesized by a hydrothermal approach to obtain a bifunctional water-splitting electrocatalyst for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in aqueous alkaline solution. Due to the richened defects formed on the 2D catalyst, the as-derived Mo 2 C/CoMoS 4 exhibits high activity. At 10 mA cm −2 , the HER and OER overpotentials of the 2D Mo 2 C/CoMoS 4 nanosheets are just 117 and 250 mV, respectively, with the corresponding Tafel slope of 90 and 75 mV dec −1 , near to the commercial Pt/C and IrO 2 . X-ray photoelectron spectroscopy proves the strong interactions between Mo 2 C and CoMoS 4 and the Raman analysis certifies the presence of richened defects in Mo 2 C/CoMoS 4 . Moreover, the Mo 2 C/CoMoS 4 possesses a long-term catalytic stability, showing potential application in the water splitting.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Xiaoyang Xu,Qianqian Liu,Linan Liang,Haoran Gu,Ying Zhao,Xuteng Xing,Xiangjing Zhang,Yongqi Hu
Nanosheet-constructed porous CoMoS 4 arrays are grown on 3D self-supported Ni foam by a simple solvothermal strategy. The resulting sample can be immediately served as an adhesive-free electrode of supercapacitors . Surprisingly, the obtained CoMoS 4 /Ni foam with high chemical activity and unique structure exhibits excellent performance including the high specific capacity of 276 mAh/g at 0.25 A/g. Moreover, the prepared CoMoS 4 /Ni foam and commercial activated carbon (AC) are specified as the positive/negative electrodes of a hybrid supercapacitor . The assembled CoMoS 4 /Ni foam//AC hybrid device outputs a high specific energy of 58 Wh/kg at a specific power of 328 W/kg, and 95% of initial capacity after 10,000 charge-discharge cycles. These conditions are favorable for the practical application of the prepared CoMoS 4 /Ni foam. Therefore, the nanosheet-constructed porous CoMoS 4 arrays on Ni foam can be considered as a hopeful electrode for 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
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Li Shao,Xing Qian,Xiaoying Wang,Hongmei Li,Rucai Yan,Linxi Hou
Highly efficient and low-cost electrocatalysts are essential for producing hydrogen through water electrolysis. Here ternary compounds CoMoS 4 and NiMoS 4 were synthesized by a one-step reaction, and further CoMoS 4 -H and NiMoS 4 -H were obtained by heating the above two samples under Ar atmosphere. The above four materials both show uniformly small irregular nanoparticles. Each element of the four materials exhibits semblable valence without distinct difference of which S was −2, Mo was +6, Ni and Co were +2. We firstly use the above ternary materials as advanced electrocatalysts for HER over a wide pH range, of which CoMoS 4 -H displays the best performance with a low onset overpotential at 8 mV in 1.0 M KOH and 83 mV in 0.5 M H 2 SO 4 . NiMoS 4 -H also shows excellent performance with a low onset overpotential at 26 mV in 1.0 M KOH and 160 mV in 0.5 M H 2 SO 4 . In 1 M phosphate buffer solution, CoMoS 4 -H and NiMoS 4 -H exhibit onset overpotential at overpotential of 122 mV and 152 mV, respectively. These results indicate that the combination of earth-abundant sulfur, cobalt (or nickel) and molybdenum elements can provide highly active electrocatalysts for HER over a wide pH range.
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 JOURNAL
·
2018
·
IF 6.735
Min Wei,Chao Wang,Yingbang Yao,Shuhui Yu,Wei-Hsin Liao,Jianwei Ren,Rong Sun,Ching-Ping Wong
Hybrids of graphite nanosheet-supported CoMoS 4 (GN-CoMoS 4 ) were synthesized through a hydrothermal method. The CoMoS 4 nanoparticles are uniformly distributed on the graphite nanosheets, leading to large specific surface area and good electrical conductivity. The GN-CoMoS 4 hybrids were systematically studied for electrode materials of supercapacitors. Due to the amorphous characteristic of CoMoS 4 , which can supply more transportation channels for ion diffusion, together with the large specific surface area and excellent conductivity of GN , the as-prepared hybrid electrode material exhibited a high specific capacitance of 774 F g −1 at the current density of 1 A g −1 and an excellent cyclic stability (94.49% of its initial specific capacitance retained after 6000 cycles at a current density of 8 A g −1 ). An all-solid-state asymmetric supercapacitor was fabricated using GN-CoMoS 4 as positive electrode and porous active carbon (AC) as negative electrode, which exhibited a highest energy density of 42.85 W h kg −1 at 900 W kg −1 and excellent cycling stability (93.2% retention after 8000 cycles). The results demonstrate that the GN-CoMoS 4 hybrids are promising candidate for the electrode materials in high-performance supercapacitors because of the well-designed microstructure.
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
SURFACE & COATINGS TECHNOLOGY
·
2021
·
IF 4.158
Xiaoyang Xu,Ting Wei,Rui Xiong,Zhenni Zhang,Xiangjing Zhang,Shanlin Qiao,Qing Li,Yongqi Hu
The high-performance Co 9 S 8 @MoS 2 composite was firstly prepared though the ammonium fluoride regulated CoMoS 4 -derived process by a simple one-step hydrothermal method , without the previous complicated and tedious preparation procedures. Moreover, it can exhibit the ultrahigh specific capacity of 213 mAh/g at 1 A/g, owing to the multiple oxidation state of Co/Mo, conductivity superiority of metallic sulfides and suitable structure. In order to simulate the application indicators of Co 9 S 8 @MoS 2 composite for commercial supercapacitors , the Co 9 S 8 @MoS 2 //AC hybrid supercapacitor device was well designed by the optimized Co 9 S 8 @MoS 2 composite and commercial active carbon (AC) as positive/negative electrode respectively, and exhibits the good electrochemical properties : the high energy density of 42 Wh/kg at 375 W/kg, and even still maintain 25 Wh/kg at the high power density of 2250 W/kg; and excellent cycle stability with no significant reduction of capacity retention after 9000 cycles. This work can not only provide a simple one-step hydrothermal preparation method of Co 9 S 8 @MoS 2 composite, but also confirm its promising application prospects in supercapacitor electrode materials.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2022
·
IF 4.654
JiangTao Cai,Yunyun Ding,Youyu Zhu,Liuhua Hou,Shiyong Zhao,Yating Zhang
It is necessary to design an anode material for lithium-ion batteries (LIBs) with good lithium storage capacity. In the present work, the CNTs@PDA/CoMoS4 composite materials were prepared through self-polymerization of dopamine (PDA) and coating on carbon nanotubes and then deposition of CoMoS4 by a hydrothermal method. Benefited from the formation of the coordination bond between the hydroxyl groups of PDA and the metal ions of CoMoS4, the combination between the CNTs@PDA matrix and CoMoS4 nanoparticles is effectively enhanced. As a result, CoMoS4 nanoparticles grow uniformly on the surface of CNTs@PDA, which reduces the diffusion length of Li+ and improves the electronic transmission efficiency. The CNTs@PDA/CoMoS4 as an anode material exhibits outstanding electrochemical properties in terms of a high capacity of 1025.2 mA h·g–1 after 100 cycles at 0.1 A·g–1. Meanwhile, its capacity is 490.3 mA h·g–1 after 200 cycles at 1 A·g–1. The desirable electrochemical properties combined with the stable structure and the facile synthesis route make CNTs@PDA/CoMoS4 composites a potential candidate for high-performance LIBs.
研究领域:
材料科学
·
储能
·
电化学
·
纳米材料
✓ 已验证
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Zhenni Zhang,Xiangjing Zhang,Xiaoyang Xu,Rui Xiong,Xuefang Tian,Chunyu Wang
The well-designed CoMoS 4 /reduced graphene oxide (RGO) composite was directly synthesized by a simple one-step hydrothermal method , in virtue of the uniformly-distributed oxygen-containing functional groups on the precursor graphene oxide (GO) surface. As expected, the optimized CoMoS 4 /RGO exhibits the high specific capacity of 123 mAh/g at 1 A/g, about 152% higher than that of pure CoMoS 4 . The reason is as follows: (1) the structure with no serious aggregation can be favor of rapid electrolyte ion transport process; (2) the RGO phase cannot only provide the high specific surface area, moderate conductivity and electrochemical double layer capacitance from the Π conjugated carbon skeleton, but also contribute to some extra Faradaic redox capacitance from a few oxygen-containing functional groups. As for practical application, the fabricated CoMoS 4 /RGO//AC asymmetric supercapacitor can deliver the good energy storage performances, such as the high energy density of 59 Wh/kg at 1125 W/kg (almost superior to the reported CoMoS 4 based asymmetric supercapacitor devices to our best knowledge), especially for the good cycle stability with 99.3% capacity retention after 6000 cycles. Therefore, this work can provide a feasible strategy to improve the supercapacitor performances of CoMoS 4 .
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）