ACS Applied Energy Materials
·
2024
·
IF 5.4
Shengxue Yan,Rui Huang,Hansai Liu,Shaohua Luo
Supercapacitors (SCs) are promising energy supply systems for various electronics. In this work, we detailed the in situ growth of FeCo2S4 on MXene for asymmetric SCs. Notably, the digital model was first built to explore the relationship between wt (FeCo2S4) and capacitance performance, realizing the maximum theoretical capacity (3635.7 F g–1) prediction. Furthermore, it was discovered that the synergistic effect of the FeCo2S4/MXene heterojunction could dramatically improve conductivity and structural stability, which accelerated charge transmission at the electrode/electrolyte interface, resulting in a significant enhancement in electrochemical performance. The FeCo2S4/MXene electrode exhibited a higher capacitance of 2415.3 F g–1 and a prominent long-term stability of about 90.5%. And the FeCo2S4/MXene//AC declared an impressive energy density of 68.7 Wh kg–1 at a power density of 800 W kg–1. The FeCo2S4/MXene composite systems have great potential for advanced SC systems due to their facile assembly and remarkable electrochemical performance.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Runyu Zhou,Yongsheng Fu,Gaofeng Zhou,Shixiang Wang,Yiqing Liu
In this study, a novel Fe/Co bimetallic spinel sulfide (FeCo 2 S 4 ) modified g-C 3 N 4 composite (FeCo 2 S 4 -CN) was prepared by a hydrothermal method and firstly applied as a catalyst for the activation of peracetic acid (PAA) at neutral pH. The efficient rhodamine B (RhB) degradation in FeCo 2 S 4 -CN/PAA system indicated that PAA was successfully activated by FeCo 2 S 4 -CN. The scanning electron microscopy (SEM) and X-ray diffraction (XRD) results indicated that g-C 3 N 4 carrier could anchor FeCo 2 S 4 particles with good dispersion. The X-ray photoelectron spectroscopy (XPS) analysis suggested that the surface ≡Co(II) and ≡Fe(II) could activate PAA to form CH 3 C(O)O • and • OH, synchronously yielding ≡Co(III) and ≡Fe(III). Meanwhile, the surface ≡Co(III) and ≡Fe(III) could also react with PAA to generate CH 3 C(O)OO • as well as ≡Co(II) and ≡Fe(II), resulting in the redox cycles of ≡Co(II)/≡Co(III) and ≡Fe(II)/≡Fe(III). Besides, the presence of S 2- in FeCo 2 S 4 -CN was favorable to these redox cycles. Radical scavenging experiments confirmed that organic radicals (i.e., CH 3 C(O)O • and CH 3 C(O)OO • ) were the primary reactive species for RhB degradation in FeCo 2 S 4 -CN/PAA system. This system also exhibited a high removal efficiency for various organic contaminants, suggesting its potential application in degrading refractory pollutants.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2021
·Vol. 127
·期 6
·1-10
·
IF 2.584
Liu Yurong,Niu Shaoyu,Hu Rong
In this work, the ferric cobalt sulfide/aminated graphene quantum dots (FeCo 2 S 4 /NH 2 -GQDs) nanoflowers grown on Ni foam substrate have been successfully fabricated via a facile two-step hydrothermal method. The as-prepared FeCo 2 S 4 /NH 2 -GQDs nanoflowers can expose plenty of electroactive sites, provide fast charge transfer paths and buffer the drastic volume change during long-term charge–discharge cycles. Therefore, the FeCo 2 S 4 /NH 2 -GQDs nanoflowers exhibit excellent supercapacitive performance, including high specific capacitance, excellent rate capability and cycling stability. The specific capacitance of FeCo 2 S 4 /NH 2 -GQDs composite electrode reaches 2314.8 and 1802.5 F g −1 at the current density of 1 and 10 A g −1 , respectively, while maintaining superior cycling stability with 95.1% capacitance retention after 5000 cycles. This study proves that NH 2 -GQDs are promising materials to enhance the electrochemical performance of bimetallic sulfides, providing a new insight for the design and fabrication of novel electrode materials for high-performance supercapacitors.
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 ELECTRONIC MATERIALS
·
2021
·Vol. 50
·期 11
·6353-6362
·
IF 1.938
Liu Yurong,Niu Shaoyu,Hu Rong
Ferric cobalt sulfide/silver nanowires/graphene (FeCo 2 S 4 /Ag NWs/G) ternary nanocomposites with hierarchical honeycomb-like morphology have been obtained through hydrothermal synthesis. In the FeCo 2 S 4 /Ag NWs/G composite electrode, the Ag NWs provide effective electron transport channels and prevent the graphene and FeCo 2 S 4 nanosheets from aggregating. The graphene sheets can not only provide connected channels for ion transportation and charge transfer but also significantly buffer the volume change of electrode. As a result, the as-prepared FeCo 2 S 4 /Ag NWs/G composite electrode exhibits a high specific capacitance of 2689.2 F/g at a current density of 1 A/g, and excellent capacitance retention of 96.1% after 5000 charge–discharge cycles. In addition, an asymmetric supercapacitor was fabricated using FeCo 2 S 4 /Ag NWs/G as positive electrode and flower-like hierarchical porous nitrogen-doped carbon sphere as negative electrode. The assembled supercapacitor delivered a high energy density of 80.6 Wh/kg at a power density of 806 W/kg. These results demonstrate that such FeCo 2 S 4 /Ag NWs/G nanocomposites have widespread application prospects in the field of electrochemical energy storage. Graphic Abstract
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Jingrui Hu,Yingqing Ou,Yanhong Li,Di Gao,Yunhuai Zhang,Peng Xiao
Efficient and stable bifunctional electrocatalysts composed of Earth-abundant elements are crucial to the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER). Herein, FeCo2S4 nanosheet arrays loaded on Ni foam (NF) are synthesized and first employed as a bifunctional electrocatalyst for full water-splitting. Remarkably, the self-assembled, binder-free, and cost-effective FeCo2S4/NF electrode shows high OER catalytic activity, which only requires an overpotential of 270 and 290 mV to achieve current densities of 50 and 100 mA cm–2, respectively. Moreover, the FeCo2S4/NF electrode exhibits considerable OER stability over 20 h at a static current density of 50 mA cm–2, with negligible potential change in alkaline electrolyte. Meanwhile, when serving as a catalyst for the HER under alkaline conditions, an overpotential of just 132 mV is required to deliver the current density of 10 mA cm–2. The structural investigation demonstrates the formation of a Co(Fe)-(oxy)hydroxides layer on the catalyst surface during the OER test, which could be the real active species. Furthermore, because of the high catalytic activity and stability of this bifunctional electrocatalyst, we prepared a high-performance overall water electrolyzer that could achieve a current density of 10 mA cm–2 at a cell voltage of 1.56 V.
研究领域:
材料科学
·
电化学
·
能源催化
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Xiaoyu Zhang,Yongguang Yang,Qian Zhang,Ruijie Bai,Lidong Li,Xinzhan Wang,Ling Li
Design inexpensive and stable counter electrodes materials is great essential for accelerating the industrial application of dye-sensitized solar cells. Herein, transition metal sulfides FeCo 2 S 4 and NiCo 2 S 4 were in-situ synthesized into composite with core–shell structure on surface of carbon paper by hydrothermal method, and is used as CEs material of DSSCs. Besides, titanium mesh with lower resistivity is also used as a conductive base to prepare the CEs and reduce the series resistance of DSSCs. Therefore, after electrochemical analysis and photoelectric performance test, it is found that the photoelectric conversion efficiency of the DSSCs assembled with composite material CEs can be as high as 10.08 % (with the J sc is 19.59 mA·cm −2 , V oc is 0.796 V, FF is 0.65), which much higher than traditional Pt CEs (7.99 %) and other corresponding counterparts, indicating that the core–shell structure is more conducive to improving the catalytic activity of the material.
研究领域:
材料科学
·
能源科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2019
·Vol. 12
·期 3
·1864-1874
·
IF 6.97
Zhiqian Hou,Chaozhu Shu,Peng Hei,Tingshuai Yang,Ruixin Zheng,Zhiqun Ran,Minglu Li,Jianping Long
The degradation of oxygen electrodes caused by oxygen species in lithium–oxygen (Li–O2) batteries deteriorates their energy efficiency and cyclability and seriously hinders their commercial application. To achieve high energy efficiency and long-term cycle life, gradient-porous ultrathin FeCo2S4 nanosheets on Ni foam (FeCo2S4@Ni) were deliberately designed as a noncarbonaceous freestanding oxygen electrode for Li–O2 batteries. Notably, the gradient-porous structure in FeCo2S4@Ni can offer sufficient active sites as well as mitigate polarization caused by the mass transfer during discharge and charge. The synergistic effect of the two transition metals, Fe2+ and Co3+, optimizes their d-band electronic structure and enhances the intrinsic activity of the oxygen electrode. Benefiting from the above merits, the FeCo2S4@Ni based Li–O2 battery demonstrates greatly increased discharge capacity (8001 mA h g−1), improved rate capability (with a high capacity of 4401 mA h g−1 at 500 mA g−1), and enhanced cycling stability (with a low overpotential of below 1 V after 109 cycles). Our work demonstrates that the battery performance can be improved by regulating the structure and composition of the oxygen electrode and provides a promising strategy for developing high performance Li–O2 batteries.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）