Energy Storage Materials
·
2023
·
IF 20.4
Jiayi Zhang,Zhengyan Du,Tingyu Yan,Fanda Zeng,Zijin Xu,Jian Xu,Zeshuo Meng,Xiaoying Hu,Jingxiang Zhao,Hongwei Tian
The energy density of supercapacitors can be improved through rapid surface reconstruction of electrode materials in an alkaline medium. Transition metal sulfides (TMSs), including Co 9 S 8 , are widely used as energy storage electrode materials owing to their excellent structural characteristics. However, systematic research dealing with the enhancement of Co 9 S 8 reconstruction ability induced by Se doping has not well been investigated. Herein, an electron orbital modulation strategy was developed to promote the reconfiguration capability of Co 9 S 8 by substitution of the Se element. The theoretical simulation and experimental characterization confirmed the successful introduction of the Se element, resulting in more polarized charge distribution in Co 9 S 8 and better charge transfer ability. The improved adsorption capacity of OH − also enhanced the intensity of surface reactions, as well as effectively increased the refactoring rate. The optimized Co 9 S 5.1 Se 2.9 exhibited a specific capacitance of 1788.1 F g −1 at 1 A g −1 . The assembled flexible asymmetric supercapacitor delivered a maximum energy density of 54.9 Wh kg −1 . Overall, the proposed strategy can effectively be used to construct high energy density electrode materials with optimized reconstruction of dynamic rates through effective modulation of electron orbitals.
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
ELECTROCHIMICA ACTA
·
2026
·
IF 5.8
Yange Liu,Dabin Li,Wei Dong,Zhenxing Wang,Guangjin Wang,Xiaodong Hong
Ni 3 S 2 /Co 9 S 8 composite is synthesized with nanosheet-wrapped irregular structures. • CV activation process and mechanism of the composite is disclosed in KOH solution. • CV activation induces the formation of well-defined hierarchical spherical structure. • The activated product presents a maximum capacitance of 4.30 F cm −2 at 1 A g −1 . A free-standing Ni 3 S 2 /Co 9 S 8 composite with nanosheet-wrapped irregular structures is fabricated on nickel foam (NF) framework. Compared with pristine Ni 3 S 2 , the specific capacitance of Ni 3 S 2 /Co 9 S 8 increases to 2.62 F cm −2 from 1.99 F cm −2 , confirming a superior electrochemical activity of the composite. To further enhance the electrochemical performance and reveal the electrochemical activation behavior of the Ni 3 S 2 /Co 9 S 8 composite, cyclic voltammetry (CV) activation strategy is employed by inducing the reconstruction of electrode materials in KOH solution. The CV activation triggers the dissolution of sulfur species and the formation of amorphous Ni/Co (oxy)hydroxides. The activated product achieves its maximum areal capacitance of 4.30 F cm −2 at 1 A g −1 after 200 cycles, resulting in a well-defined spherical structure consisted of interconnected ultrathin nanosheets. The capacitance enhancement can be ascribed to hierarchical spherical structure and the optimized composition, which provide abundant active sites and facilitate ion diffusion and charge transfer. When configured as an asymmetric supercapacitor, the device comprising the Ni 3 S 2 /Co 9 S 8 composite and activated carbon exhibits a specific capacitance of 175.6 F g −1 , and the highest energy density reaches 62.44 Wh kg −1 . The Ni 3 S 2 /Co 9 S 8 composite shows significant potential as a high-performance electrode material for advanced supercapacitor applications. A Ni 3 S 2 /Co 9 S 8 composite with a nanosheet-wrapped irregular morphology is grown on Ni foam. CV activation dissolves sulfur species and forms amorphous Ni/Co (oxy)hydroxides with a hierarchical spherical structure, achieving a maximum areal capacitance of 4.30 F cm −2 at 1 A g −1 . Download: Download high-res image (156KB) Download: Download full-size image
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Shizong Wang,Haiyang Liu,Jianlong Wang
In this study, nitrogen, sulfur and oxygen co-doped carbon armored cobalt sulfide (Co/Co 9 S 8 @N-S-O-C) composite was synthesized, characterized and used to activate peroxymonosulfate (PMS) for the degradation of sulfamethoxazole (SMX). SMX (0.04 mM) can be completely degraded within 20 min in the presence of 0.8 mM PMS and 0.1 g/L Co/Co 9 S 8 @N-S-O-C composite. The first-order kinetics constant of SMX degradation was 0.307 min -1 , and the mineralization of SMX was 30.1 %. The Quenching experiments of the free radicals and the identification of degradation products demonstrated that sulfate radicals played a dominant role in SMX degradation. The degradation rate of SMX increased with temperature, and activation energy was calculated to be 48.6 kJ/mol. The degradation rate of SMX increased firstly then decreased with increase of pH. Chloridion and humic acid decreased the degradation rate of SMX no matter what their initial concentration was. The effect of carbonate on SMX degradation depended on its initial concentration. Co/Co 9 S 8 @N-S-O-C composite showed good stability, the removal efficiency of SMX was 98.4 % in the fifth experiment. Based on the characterization results of the catalyst before and after use, it was concluded that cobalt, sulfur, pyridnic N and graphitic N were responsible for PMS activation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2019
·
IF 6.395
Bing-Ye Song,Ming-Jia Li,Yi-Wen Yang,Ya-Ling He
One of the urgent problems in the commercialization of fuel cells is the high cost of electrode materials due to the use of Pt/C as the catalyst for oxygen reduction reaction (ORR). Herein, by taking advantages of the metal-organic frameworks, a novel ORR catalyst of Co@Co 9 S 8 –N/C with composite porous structure is synthesized with a facile coprecipitation-pyrolysis method. Co@Co 9 S 8 –N/C is composed of graphitic carbon skeleton with Co 9 S 8 covered Co nanoparticles (Co@Co 9 S 8 ) and nitrogen atoms doping on, on which Co@Co 9 S 8 and pyridinic N provide catalytic sites for ORR. The N, S doped surrounding graphitic carbon skeleton after pyrolysis and vulcanization processes can protect the electrochemical active sites from deactivation. The fabricated Co@Co 9 S 8 –N/C with abundant catalytic active sites performs excellent ORR activity and stability. Thereafter, the structure of the Co@Co 9 S 8 –N/C is optimized by changing the Zn/Co ratio in the precursor to improve its ORR performance. The results show that with the Zn/Co ratio of 3:2, Co@Co 9 S 8 –N/C gives the best ORR activity relying on its well specific surface area, sufficient and uniform-dispersed catalytic sites. Based on this, the Co@Co 9 S 8 –N/C catalytic alkaline direct glucose fuel cells perform better than the Pt/C catalytic one.
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
ELECTROCHIMICA ACTA
·
2026
·
IF 5.8
Xueying Lu,Xu Han,Dan Zhao,Tianhao Wang,Yinan Liu,Jing Hu,Yitao He
Hydrogen energy, featuring high energy density and environmental friendliness, is a highly promising renewable clean energy carrier. Electrolytic water splitting for hydrogen production is effective for high-purity H 2 , with efficient and stable electrocatalysts being the key to efficiency optimization. Rhenium-based catalysts attract attention due to their unique electronic structure, high activity, and broad pH adaptability, but enhancing their hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) performance remains a challenge. This study reports a two-step hydrothermal method to in situ grow Co 9 S 8 -ReS 2 Ni 3 S 2 on nickel foam. Co incorporation induces “coral-like” nanostructures, increasing active surface area and suppressing agglomeration, while strong ReS 2 Co 9 S 8 interfacial coupling optimizes charge redistribution. The catalyst exhibits overpotentials of 89 mV (HER) and 268 mV (OER) at 10 mA cm -2 , achieves 10 mA cm -2 at 1.61 V for overall water splitting, and maintains stability for 100 h, providing new insights for high-performance electrocatalysts.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Ying Yang,Daorui Wang,Yuanyuan Wang,Zelin Li,Rui Su,Xin Wang,Tong Xu,Shuangxi Wang
Metal sulfide electrocatalysts with high activity toward the oxygen evolution reaction (OER) are crucial for renewable energy technologies. However, it remains challenging to rationally design and synthesize metal sulfides integrated with high conductivity and rich porosity to achieve a superior activity. Herein, we report a brand-new, carbonaceous Co9S8-ZnS nanotube (Co9S8-ZnS/NTC) electrocatalyst synthesized via a two-step procedure including zinc-trimesic acid (ZnBTC) fiber nanocrystallization and its assembling with ZIF-67 before solid-state transformation (including sulfuration, gas-phase ion exchange, and carbonization). It is found that rich sulfur vacancies (point defect) and a hollow cavity (3-dimensional defect) are integrated into the resulting carbonaceous Co9S8-ZnS nanotube, originated from the non-equilibrium interdiffusion, which could facilitate electron transfer and OH– transport during the oxygen evolution. As expected, the designed Co9S8-ZnS/NTC delivers a low overpotential of 290 mV, a Tafel slope of 69 mV–1, an electrical resistance of 44 Ω for OER at 10 mA cm–2 in alkaline media, and a high electrochemically active surface area and turnover frequency of 12.2 mF cm–2 and 0.70 O2 s–1, respectively, at 1.50 V, superior to single-component electrocatalysts of Co9S8 and ZnS anchored on N-doped carbon. Density functional theory calculation demonstrates that the sulfur vacancy in Co9S8-ZnS/NTC delivers the decreased theoretical overpotential (1.29 V) and the enhanced activity of its neighboring Co sites, which was also beneficial to OER kinetics. Sulfur vacancy reparation results in a much lower electrocatalytic activity (overpotential, 465 mV) for Co9S8-ZnS/NTC, indicative of its critical role in OER. The concept demonstrated in this study paves the avenue to design other high-performance non-noble electrocatalysts for OER.
研究领域:
材料科学
·
电化学
·
可再生能源技术
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2021
·Vol. 45
·期 9
·13040-13054
·
IF 5.164
Peng Su,Hai Liu,Qingxiang Ma,Zhiliang Jin
Summary The photocatalytic hydrogen evolution reaction is one of the important ways to convert solar energy into renewable hydrogen. In this work, the Co 9 S 8 hollow polyhedron was formed after sulfidation and calcination with the metal-organic framework ZIF-67. The hollow polyhedron Co 9 S 8 provides abundant support sites for Mn 0.05 Cd 0.95 S and effectively reduces the agglomeration degree of Mn 0.05 Cd 0.95 S. The Co 9 S 8 hollow polyhedron as the reaction site has a large specific surface area and a mesoporous structure, which is beneficial to the progress of the photocatalytic reaction. A series of tests showed that the introduction of Co 9 S 8 hollow polyhedron significantly improved the light-trapping ability and exposed more reaction sites. Co 9 S 8 hollow polyhedrons are used as electron capture sites, which can effectively collect electrons and induce the interface charge transfer of Mn 0.05 Cd 0.95 S to Co 9 S 8 . Because the Co 9 S 8 -Mn 0.05 Cd 0.95 S composite catalyst had a strong light-trapping ability, abundant reaction sites and Co 9 S 8 -Mn 0.05 Cd 0.95 S heterojunction accelerate the separation and transfer of charges. Therefore, the hydrogen evolution rate of the 10%Co 9 S 8 -Mn 0.05 Cd 0.95 S composite catalyst was relatively high, which was 13.369 mmol g −1 h −1 . In addition, the 10%Co 9 S 8 -Mn 0.05 Cd 0.95 S composite catalyst still has good hydrogen evolution stability after four cycles. This research may supply a new idea for the preparation of high-efficiency photocatalysts with hollow structures. Novelty Statement The Co 9 S 8 hollow polyhedron provides abundant support sites for M 0.05 C 0.95 S particles, which effectively reduces the degree of agglomeration. The Co 9 S 8 -M 0.05 C 0.95 S heterojunction catalyst not only accelerates the migration and transfer of electrons, but also provides abundant reaction sites. Therefore, the Co 9 S 8 -M 0.05 C 0.95 S composite catalyst has good catalytic activity.
研究领域:
材料科学
·
能源化学
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 53
·期 1
·759-773
·
IF 2.599
Liu Ping,Chang Xing,Lin Jingjing,Yan Song,Yao Lu,Lian Jun,Lin Hualin,Han Sheng
Poly( m -phenylenediamine)-coated hexagonal Co 9 S 8 was firstly synthesized by the polymerization with self-prepared hexagonal Co(OH) 2 used as cobalt source, and the calcination with sulfur powder providing sulfur source. By adjusting the concentration of m -phenylenediamine in the polymerization process, the coating was achieved with the different coated results, further affecting their supercapacitor behaviors by improving diffusion path for fast electron transfer. The resulting Co 9 S 8 /PmPD electrodes demonstrate excellent electrochemical performance with high specific capacitance of 950.1 F g −1 at a current density of 0.5 Å g −1 , good rate performance of 81.1% capacitance retention as the current density grows from 0.5 to 20 Å g −1 , and almost no capacitance loss after 1000 cycles. Moreover, as asymmetric positive electrode material, the Co 9 S 8 /PmPD-1 shows high specific capacitance of 115.3 F g −1 at 0.5 Å g −1 , outstanding rate performance of 78.2% capacitance retention even increased to 20 Å g −1 , superior cycle stability of 87.9% capacitance retention after 5000 cycles at 2 Å g −1 and largest energy density of 36.0 W h kg −1 at power density of 374.67 W kg −1 . This novel Co 9 S 8 /PmPD composite suggests a bright prospect for supercapacitor 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
RENEWABLE ENERGY
·
2020
·
IF 6.274
Bin Dong,Jing-Yi Xie,Nan Wang,Wen-Kun Gao,Yu Ma,Tian-Shu Chen,Xin-Tong Yan,Qing-Zhong Li,Yu-Lu Zhou,Yong-Ming Chai
As the cost-effective and nontoxic alternative for hydrogen evolution reaction (HER), Co 9 S 8 has attracted much attention. This paper explores the regulation of Zn doping impacted the unique nanostructure and electrocatalytic performance on Co 9 S 8 . Herein, utilizing copper foam (CF) as substrate, a series of different nanostructure of (Zn-)Co 9 S 8 @CF has been synthesized by accurately varying the ratio of Zn 2+ to Co 2+ . Compared with aggregated pure Co 9 S 8 and other different ratios contrast samples, Zn–Co 9 S 8 @CF-(1-1) with a zinc to cobalt ratio of 1 possesses highly dispersity which can be attributed to the novel nano-neuron network structure. The electrochemical measurements for HER demonstrate that Zn–Co 9 S 8 @CF-(1-1) not only reveals superior activity with small overpotentials to achieve a current density of 10 mA cm −2 in acidic (278 mV) and alkaline (273 mV) media, but also exhibits long-time durability in the solution with a wide range of pH. The excellent performance of Zn–Co 9 S 8 @CF-(1-1) can be attributed to the unique reticular structure which can facilitate exposure of numerous active sites and favorable long-term stability. The substrate of three-dimensional CF can provide the remarkable conductivity. This work provides a precise and effective approach to regulate three-dimensional nanostructure of Zn-doped electrocatalysts for HER.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·Vol. 47
·期 14
·8811-8819
·
IF 7.139
Pengzhan Yang,Fanrong Kong,Xulei Sui,Lei Zhao,Yue Qiu,Hongda Zhang,Zhenbo Wang
It is of great significance to develop efficient and inexpensive oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) bifunctional catalysts for the current energy crisis. But this is still a long-term and formidable challenge. In this work, a two-phase synergistic effect between transition metal sulfides is applied in the design of ORR/OER bifunctional catalysts. Co-based zeolite imidazolate framework (MOF) is used as a precursor to prepare the hollow Co 9 S 8 through vulcanization and heat treatment. At the same time, the phase transformation occurs to form some Zn 0.76 Co 0.24 S on surface during the heat treatment due to the Zn-polydopamine coating. The hollow structure Zn 0.76 Co 0.24 S–Co 9 S 8 composite has been verified and promotes the diffusion of reactants and products, and the interaction between two phases greatly promotes the catalytic reactions . The coating of Zn-polydopamine forms uniform carbon layer on surface, enhancing the conductivity of Zn 0.76 Co 0.24 S–Co 9 S 8 composite. The Zn 0.76 Co 0.24 S–Co 9 S 8 composite shows much better performance of ORR and OER compared to any of them. The overpotential of OER at a current density of 10 mA/cm 2 is 330 mV, and the half-wave potential of ORR is 0.83 V. Additionally, the Zn 0.76 Co 0.24 S–Co 9 S 8 composite displays better cyclic stability. The synergistic effect of Zn 0.76 Co 0.24 S and Co 9 S 8 can be considered as the foremost factor for the improvement of catalyst performance, which provides new possibilities for the development of non-precious metal bifunctional catalysts.
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Liang-Liang Feng,Guo-Dong Li,Yipu Liu,Yuanyuan Wu,Hui Chen,Yun Wang,Yong-Cun Zou,Dejun Wang,Xiaoxin Zou
Splitting water to produce hydrogen requires the development of non-noble-metal catalysts that are able to make this reaction feasible and energy efficient. Herein, we show that cobalt pentlandite (Co9S8) nanoparticles can serve as an electrochemically active, noble-metal-free material toward hydrogen evolution reaction, and they work stably in neutral solution (pH 7) but not in acidic (pH 0) and basic (pH 14) media. We, therefore, further present a carbon-armoring strategy to increase the durability and activity of Co9S8 over a wider pH range. In particular, carbon-armored Co9S8 nanoparticles (Co9S8@C) are prepared by direct thermal treatment of a mixture of cobalt nitrate and trithiocyanuric acid at 700 °C in N2 atmosphere. Trithiocyanuric acid functions as both sulfur and carbon sources in the reaction system. The resulting Co9S8@C material operates well with high activity over a broad pH range, from pH 0 to 14, and gives nearly 100% Faradaic yield during hydrogen evolution reaction under acidic (pH 0), neutral (pH 7), and basic (pH 14) media. To the best of our knowledge, this is the first time that a transition-metal chalcogenide material is shown to have all-pH efficient and durable electrocatalytic activity. Identifying Co9S8 as the catalytically active phase and developing carbon-armoring as the improvement strategy are anticipated to give a fresh impetus to rational design of high-performance noble-metal-free water splitting catalysts.
研究领域:
材料科学
·
化学
✓ 已验证
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
危险品化学品经营许可证（带存储）