Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 26
·12701-12707
·
IF 9.931
Bo Wang,Zegao Wang,Xinqiang Wang,Binjie Zheng,Wanli Zhang,Yuanfu Chen
For the first time, porous microspheres of bimetallic CoSe2–MoSe2 hybrids with reduced graphene oxide and amorphous carbon (CS-MS/rGO-C) are synthesized through a facile, low-cost and scalable spray drying approach and a subsequent selenization process. The CS-MS/rGO-C electrocatalyst delivers excellent performance for the hydrogen evolution reaction (HER) in both acidic and alkaline media: in acidic solution, CS-MS/rGO-C has a very low onset potential of −142 mV vs. RHE and a low Tafel slope of 51.3 mV dec−1, and the overpotential at −10 mA cm−2 is as low as −195 mV vs. RHE; in alkaline media, the onset potential of CS-MS/rGO-C is −125 mV vs. RHE, and the Tafel slope is 83.2 mV dec−1, and the overpotential at −10 mA cm−2 is −215 mV vs. RHE. Moreover, it has outstanding long-term stability in both media even after 1000 cycles. The outstanding HER performance of CS-MS/rGO-C can be attributed to its bi-metallic composition, porous rGO-C microsphere structure, and conductive rGO-C skeleton, which can not only provide abundant active sites, but also guarantee high conductivity for CS-MS, thus facilitating the charge transfer. This work provides new insights into scalable synthesis of low-cost electrocatalysts with high efficiency and long-term stability, which can be extended to large-scale production of other advanced electrocatalysts to replace precious Pt-based catalysts for hydrogen evolution.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Materials Today Energy
·
2021
·
IF 7.311
Ruopeng Li,Qingyang Li,Lihui Xiao,Xinxin Bai,Shanshan Ji,Jinqiu Zhang,Maozhong An,Peixia Yang
Zinc–air batteries are regarded as ideal candidates for next-generation energy conversion and storage devices, but their conversion efficiency is mainly limited by the sluggish kinetics of the oxygen evolution reaction (OER). Therefore, development of highly active and durable non-noble-metal OER catalysts is of great significance to promote their industrialization process. Herein, we electrodeposit amorphous CoSe 2 ultrathin nanosheet arrays which exhibit a low overpotential of ∼0.287 V at 10 mA/cm 2 and a Tafel slope of ∼62 mV/dec toward the OER in 1 M KOH. This catalytic activity is superior to their crystalline counterpart, commercial RuO 2 , and most of the reported Co-based catalysts. It can be mainly attributed to the lowered adsorption free energy of OER intermediates and improved charge transfer ability with a phase transformation from the crystalline state to the amorphous state, besides the intrinsic catalytic activity of CoSe 2 . When serving as an air cathode in a zinc–air battery, the amorphous CoSe 2 also realizes a larger power density and a better long-term cyclability compared with those of crystalline CoSe 2 and Pt/C–RuO 2 electrodes. This work offers a new underpotential deposition strategy to fabricate high-activity amorphous catalysts and demonstrates its great potential for practical applications.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Minghao Bao,Junhong Chen,Bozhong Pi,Qizhen Zhang,Zhongbo Han,Hongbiao Huo,Chunpei Yu,Wenchao Zhang
A green electrocatalytic system for co-production of SATz energetic material and H 2 . • Clean electrons replace hazardous chemical oxidants for SATz synthesis with SATz yield of 75.2%. • CoSe 2 @MoSe 2 @Pt/NF achieves 30 mV@10 mA·cm −2 and 192 mV@10 mA·cm −2 overpotential for HER. • Coupling system achieves low cell voltage of 1.44 V at 10 mA·cm −2 . Replacing the kinetically sluggish oxygen evolution reaction (OER) with thermodynamically more favorable electrochemical oxidation reactions represents an effective strategy to enhance energy efficiency and economic viability in water electrolysis. Herein, we designed a CoSe 2 @MoSe 2 @Pt/NF heterostructured catalytic electrode and construct an integrated electrocatalytic coupling system that enables the co-production of azo-bridged nitrogen-rich energetic material (sodium 5,5′-azotetrazolate, SATz) at the anode and clean hydrogen energy at the cathode. Mechanistic studies reveal that hydroxyl radicals generated via water electrolysis initiate the oxidative coupling of 5-aminotetrazole, achieving a SATz yield of 75.2% under optimized conditions. The CoSe 2 @MoSe 2 @Pt/NF cathode exhibits exceptional HER catalytic activity with a low overpotential of 192 mV at 100 mA·cm −2 and a Tafel slope of 50.2 mV·dec −1 , along with remarkable stability. Notably, the assembled coupling system requires a substantially reduced cell voltage of only 1.44 V to achieve 10 mA·cm −2 , significantly lower than that of conventional overall water splitting (>1.71 V). This work presents a sustainable and energy-efficient strategy for the simultaneous production of green energetic materials and clean hydrogen fuel, opening new avenues for advanced electrocatalytic coupling systems. Download: Download high-res image (166KB) Download: Download full-size image
✓ 已验证
DOI
高影响因子
IONICS
·
2021
·Vol. 27
·期 8
·3327-3337
·
IF 2.817
Xiao Dejun,Liu Suqin,Zhao Kuangmin,Ye Guanying,Su Yuke,Zhu Weiwei,He Zhen
Ultrasmall nitrogen-doped carbon-coated CoSe 2 /ZnSe nanospheres (CoSe 2 /ZnSe@C nanospheres) are fabricated by direct selenization of a delicately designed Co 1.6 Zn 0.4 -(benzimidazole) 4 metal–organic framework (MOF) nanosheet precursor and used as the anode materials in sodium-ion batteries (SIBs). The fabricated CoSe 2 /ZnSe@C nanospheres deliver a remarkable rate performance (395 mAh g −1 at 0.1 A g −1 and 341 mAh g −1 at 5.0 A g −1 ) and excellent long-term durability (346 mAh g −1 after 2500 cycle at 2.0 A g −1 ). The superior Na storage performance of the fabricated CoSe 2 /ZnSe@C nanospheres could be mainly attributed to their ultrasmall particle sizes and the phase boundaries between CoSe 2 and ZnSe, which improve the kinetics of the electrode, relieve the volume change during the charge/discharge process, and provide extra Na + storage sites. This work opens up possibilities to fabricate metal selenide–based hybrid materials with desired nanostructures and compositions from rationally designed multimetal MOF precursors for high-performance anode materials in SIBs.
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
Yingjie Zhang,Yuzheng Li,Chengxiao Xu,Daming Li,Jun Cao,Peipei Huo
Lithium‑sulfur batteries (LSBs) are recognized as promising candidates for the next generation of secondary batteries due to their high energy density, high theoretical capacity, and low environmental impact. However, the poor electrical conductivity of sulfur and Li 2 S, the “shuttle effect” of polysulfides, and the slow kinetics of redox reactions have significantly hindered the practical application of LSBs. In this work, CoSe 2 -loaded carbon nanofibers (CoSe 2 @CNF) derived from metal-organic frameworks were successfully prepared by electrospinning and used as a functional coating on the polypropylene separator. The three-dimensional network structure of CNFs not only improves the electrical conductivity of the material but also provides channels to facilitate ion and electron transport, while the CoSe 2 particles distributed on the surface effectively act as adsorption and catalytic active sites for lithium polysulfides. Under the synergistic effect, the CoSe 2 @CNF-modified separator suppressed the shuttle effect and significantly enhanced the kinetics of redox reactions. The LSBs assembled with CoSe 2 @CNF-modified separator exhibited excellent electrochemical performance, achieving an initial capacity of 1445.6 mAh g −1 at 0.5C and maintaining a discharge specific capacity of 849.5 mAh g −1 after 275 cycles.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Ling Wang,Miaoling Hu,Changzheng Lin,Jiangtao Feng,Wei Yan
Transition metal chalcogenide anodes have attracted significant attention for sodium-ion batteries (SIBs) owing to their relatively high theoretical capacity. However, the inherently poor electronic conductivity and rate performance hinder their practical application. In this study, hierarchically structured CoSe 2 /TiN/nitrogen-doped carbon nanofibers wrapped with in-situ grown carbon nanotubes (CNTs) on the surface (denoted as CoSe 2 @N-TCF/CNTs) are designed and fabricated as binder-free anodes for SIBs. The rational design can effectively avoid the agglomeration of CoSe 2 nanoparticles, improve the conductivity of the composite materials, provide enough space for electrolyte penetration and volume expansion during the cycling process and shorten the transmission paths of electrons and Na + . With these structural and compositional advantages, the as-obtained hierarchical CoSe 2 @N-TCF/CNTs deliver a high reversible capacity of 401.2 mAh g −1 after 1000 cycles at 0.2 A g −1 and maintained at 353.7 mAh g −1 even at a high current density of 2 A g −1 when directly used as a binder-free anode for SIBs. The superior sodium-ion storage performance can be attributed to the decreased charge transfer resistance , improved Na + diffusion rate and the pseudocapacitance behavior, as is evidenced by kinetics analysis .
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
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Hongshun Zhao,Yanli Qi,Kang Liang,Jianbin Li,Liangyan Zhou,Jinyuan Chen,Xiaobing Huang,Yurong Ren
Cobalt diselenide (CoSe2) has drawn great concern as an anode material for sodium-ion batteries due to its considerable theoretical capacity. Nevertheless, the poor cycling stability and rate performance still impede its practical implantation. Here, CoSe2/nitrogen-doped carbon-skeleton hybrid microcubes with a TiO2 layer (denoted as TNC-CoSe2) are favorably prepared via a facile template-engaged strategy, in which a TiO2-coated Prussian blue analogue of Co3[Co(CN)6]2 is used as a new precursor accompanied with a selenization procedure. Such structures can concurrently boost ion and electron diffusion kinetics and inhibit the structural degradation during cycling through the close contact between the TiO2 layer and NC-CoSe2. Besides, this hybrid structure promotes the superior Na-ion intercalation pseudocapacitance due to the well-designed interfaces. The as-prepared TNC-CoSe2 microcubes exhibit a superior cycling capability (511 mA h g–1 at 0.2 A g–1 after 200 cycles) and long cycling life (456 mA h g–1 at 6.4 A g–1 for 6000 cycles with a retention of 92.7%). Coupled with a sodium vanadium fluorophosphate (Na3V2(PO4)2F3)@C cathode, this assembled full cell displays a specific capacity of 281 mA h g–1 at 0.2 A g–1 for 100 cycles. This work can be potentially used to improve other metal selenide-based anodes for rechargeable batteries.
研究领域:
材料科学
·
电化学
·
储能
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
VACUUM
·
2025
·
IF 3.9
Jiajia Ye,Zizhong Chen,Zifan Wang,Li Han,Mingyuan Pang,Zhen Kong,Juan An,Zheng Li,Guang Xia
P-doped CoSe 2 /FeSe 2 heterojunction nanoparticles (2–10 nm) anchored on a three-dimensional porous foam-like carbon network were synthesized via a direct pyrolysis-blowing strategy followed by phosphorization/selenization process. This carbon network serves as a continuous pathway for electron conduction, enhances specific surface area, and alleviates electrode volume expansion during cycling. Specifically, P-doping further improves the electrical conductivity of CoSe 2 /FeSe 2 nanoparticles, significantly accelerating electrochemical kinetics and enabling high specific capacities at elevated current densities. Benefiting from the unique nanostructure and atomic-level P-doping, the P-CoSe 2 /FeSe 2 (2:1)/C anode delivers prominent cycling stability (210.9 mAh g −1 after 2000 cycles at 2000 mA g −1 ) and exceptional rate capability (323.5 mAh g −1 at 5000 mA g −1 ). This work demonstrates that combining heterojunction engineering with heteroatom doping is an effective strategy to enhance the long-term cycling stability of sodium-ion battery anodes.
✓ 已验证
产品关联
DOI
高影响因子
Science Bulletin
·
2024
·
IF 18.8
Chuanliang Wei,Zhengran Wang,Peng Wang,Xinlu Zhang,Xuguang An,Jinkui Feng,Baojuan Xi,Shenglin Xiong
The practical application of lithium–sulfur (Li–S) batteries is inhibited by the shuttle effect of lithium polysulfides (LiPSs) and slow polysulfide redox kinetics on the S cathode as well as the uncontrollable growth of dendrites on the Li metal anode . Therefore, both cathode and anode sides must be considered when modifying Li−S batteries. Herein, two-dimensional (2D) ultrathin CoSe 2 nanobelts are in situ grown on 2D N-doped MXene nanosheets (CoSe 2 @N-MXene) via one-step solvothermal process for the first time. Owing to its unique 2D/2D structure, CoSe 2 @N-MXene can be processed to crumpled nanosheets by freeze-drying and flexible and freestanding films by vacuum filtration. These crumpled CoSe 2 @N-MXene nanosheets with abundant active sites and inner spaces can act as S hosts to accelerate polysulfide redox kinetics and suppress the shuttle effect of LiPSs owing to their strong adsorption ability and catalytic conversion effect with LiPSs. Meanwhile, the CoSe 2 @N-MXene film (CoSe 2 @NMF) can act as a current collector to promote uniform Li deposition because it contains lithiophilic CoSe 2 and N sites. Under the systematic effect of CoSe 2 @N-MXene on S cathode and Li metal anode, the electrochemical and safety performance of Li–S batteries are improved. CoSe 2 @NMF also shows excellent storage performances in flexible energy storage devices.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Bin Li,Haoyu Hu,Han Hu,Congcong Huang,Dongqing Kong,Yanpeng Li,Qingzhong Xue,Zifeng Yan,Wei Xing,Xiuli Gao
Lithium-ion capacitors (LIC) have problems such as the imbalance of electrochemical kinetics between the battery-type anode and the capacitive cathode, and the large change in the working potential of the hard carbon anode during charge and discharge, which limit the improvement of electrochemical performance for LIC. To solve these problems, CoSe 2 nanoparticles embedded nitrogen-doped hard carbon microspheres (NCS-CoSe 2 ) are synthesized and used as the anode material of LIC. Electrochemical tests show that NCS-CoSe 2 has a reversible specific capacity of as high as 500 mAh g −1 at a current density of 1 A g −1, which can effectively stabilize the working potential of the anode. At a high working voltage window of 2.2–4.5 V, the potential change of the NCS-CoSe 2 anode is as low as 0.35 V, significantly smaller than that of the pure hard carbon (0.87 V). Regarding the electrode kinetics, the NCS-CoSe 2 anode is matched with the active carbon cathode well. When the power density rises sharply from 335 W kg −1 to 6700 W kg −1 , the energy density of NCS-CoSe 2 //AC LIC can attain 82 Wh kg −1 (56.9% of initial energy density).
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
·
2022
·
IF 6.371
Ling Li,Zhiqiang Wei,Weizhe Liu,Meijie Ding,Zhiming Li
Reasonable construction of multi-pore heterogeneous structures and enhancement of synergistic interaction between metal ions are important means to improve the performance of supercapacitors . This work selected metal organic frameworks (MOF) as the sacrificial template, and Se-doped needle-like nanosphere heterostructures Se-CoSe 2 @ZnSe were successfully prepared by in situ growth and selenization treatment. The specific capacity of the Se-CoSe 2 @ZnSe-5 (CZS-5) electrode is up to 2469.12 F g −1 at 1 A g −1 , and the capacity retention rate of 3000 cycles at a current density of 10 A g −1 is 85.39 %. The CZS-5//AC hybrid supercapacitor has a high power density of 1280.00 W kg −1 at an energy density of 68.88 Wh kg −1 . The excellent electrochemical properties are attributed to the construction of Se-CoSe 2 @ZnSe heterostructure of needle-shaped nanospheres enhances the synergy between Zn and Co ions; the doping of selenium effectively improves the conductivity of the electrode material; selenium vacancies produced during selenization increase the activity of the active site. In addition, the density functional theory (DFT) calculation shows that Se-CoSe 2 @ZnSe-5 has higher density of states (DOS) near the Fermi energy level, which provides additional theoretical support for the improvement of electrochemical performance.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 23
·10385-10392
·
IF 7.79
Xiuping Sun,Suyuan Zeng,Ruxia Man,Lu Wang,Bo Zhang,Fang Tian,Yitai Qian,Liqiang Xu
Transition metal selenides (TMSs) are suitable for SIBs and PIBs owing to their satisfactory theoretical capacity and superior electrical conductivity. However, the large radius of Na+/K+ easily leads to sluggish kinetics and poor conductivity, which hinder the development of SIBs and PIBs. Structure design is an effective method to solve these obstacles. In this study, Co2+ ions combined with glycerol molecules to form self-assembled nanospheres at first, and then they were in situ converted into CoSe2 nanoparticles embedded in a carbon matrix during the selenization process. This structure has three-dimensional ion diffusion channels that can effectively hamper the aggregation of metal compound nanoparticles. Meanwhile, the CoSe2/C of the yolk–shell structure and a large number of pores help alleviate volume expansion and facilitate electrolyte wettability. These structural advantages of CoSe2/C endow it with remarkable electrochemical performances for full/half SIBs and full/half PIBs. The obtained CoSe2/C exhibits superior stability and excellent performance (312.1 mA h g−1 at 4 A g−1 after 1600 cycles) for SIBs. When it is used as an anode material for PIBs, 369.2 mA h g−1 can be retained after 200 cycles at 50 mA g−1 and 248.1 mA h g−1 can be retained after 200 cycles at 500 mA g−1; in addition, CoSe2/C also shows superior rate capacity (186.4 mA h g−1 at 1000 mA g−1). A series of ex situ XRD measurements were adapted to explore the possible conversion mechanism of CoSe2/C as the anode for PIBs. It is worth noting that the full-cell of CoSe2/C//Na3V2(PO4)3@rGO for SIBs and the full-cell of CoSe2/C//PTCDA-450 for PIBs were successfully assembled. The relationship between the structure and performance of CoSe2/C was investigated through density functional theory (DFT).
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）