CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Zhenyuan Ji,Lizhi Chen,Hongquan Yu,Wenyao Dai,Guanxiang Tang,Huali Li,Guoxing Zhu,Aihua Yuan,Xiaoping Shen
The development of novel electrode materials with admirable electrochemical behaviors is a new opportunity to meet the current demand for the high energy density of supercapacitors. Herein, a facile molecular precursor route is used to synthesize dual functionalized Fe 2 O 3 two-dimensional nanosheets with phosphate and nitrogen-doped carbon dots (P-Fe 2 O 3 /NCDs) modifications. Taking full use of the excellent characteristics of each component, the optimized P-Fe 2 O 3 /NCDs anode material achieves superior electrochemical features with an outstanding specific capacitance of 453 F g −1 at 1 A g −1 . The cycling stability of P-Fe 2 O 3 /NCDs nanosheets is as high as 91.0 % after 10,000 cycles at 15 A g −1 . Subsequently, phosphate and NCDs modified Co 9 S 8 (P-Co 9 S 8 /NCDs) nanoflowers with convenient ion transport properties are fabricated, which possess a satisfied electrochemical capacity of 569 C g −1 at 1 A g −1 with desirable cycling stability at 15 A g −1 . Impressively, the designed P-Co 9 S 8 /NCDs//P-Fe 2 O 3 /NCDs hybrid supercapacitor can achieve an excellent energy density of 85.1 Wh kg −1 at 937.5 W kg −1 and can retain 93.9 % capacitance efficiency after 20,000 cycles at 10 A g −1 . The superior properties of the dual functionalized electrode materials provide a new choice for constructing advanced hybrid supercapacitors.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2024
·Vol. 16
·期 36
·17009-17023
·
IF 5.8
Congcong Wang,Suili Shi,Boya Liu,Guorong Wang,Zhiliang Jin
Rational design and synthesis of a unique heterojunction photocatalyst structure is an important strategy to enhance its performance and structural stability. Herein, Co9S8/MnCdS/Co3O4 photocatalysts with double S-scheme heterojunctions were successfully prepared by coupling Co9S8 and Co3O4 sheet structures with n-type MnCdS nanoparticles through a simple solvothermal and mechanical mixing method. The construction of the dual S-scheme heterostructure offers the possibility to expand the light absorption range, extend the carrier lifetime and maximise the redox capacity. In addition, the mechanism of charge transfer and the reason for the improvement of photocatalytic activity were explored through photoelectrochemical characterization. The lamellar structures of Co9S8 and Co3O4 not only provide excellent dispersion and slow down the agglomeration of MnCdS nanoparticles, but also promote charge transfer, which improves the photocatalytic hydrogen production effect. Under simulated solar irradiation, the evolution rate of H2 after 5 h was as high as 46.44 μmol, which was 3.49 and 1.49 times higher than those of pristine MnCdS and MnCdS/Co3O4, respectively. Meanwhile, it has good stability under 20 h irradiation. This work demonstrates a novel idea for the rational design of double S-scheme photocatalysts with efficient space separation.
研究领域:
材料科学
·
光催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Dianchun Ju,Yingying Li,Bin Han,Yunjie Bao,Leyan Jiang,Hui Li,Yuxia Liu,Chunyu Chen
Heteroatom-doped graphene lamellae can effectively modulate the physical and chemical surface activities of Co 9 S 8 materials. The addition of a second dopant atom, such as nitrogen (N) can further improve the composite properties. Herein, novel nitrogen‑sulfur double-doped graphene-loaded SiO 2 /Co 9 S 8 composites (SiO 2 /Co 9 S 8 @NSG) were prepared by a one-step solvothermal method using polyethylene glycol as the carbon source and cobalt chloride hexahydrate as the cobalt source to yield a Deep Eutectic Solvents (DESs) system. The precursor was then obtained by adding tetraethyl silicate as the silicon source, thiourea as the sulfur source, and urea as the nitrogen source. The uniform distribution of Co 9 S 8 in the N/S-doped graphene matrix formed graphene-coated SiO 2 particles SiO 2 /Co 9 S 8 @NSG with high specific surface area, superior ionic conductivity, and elevated theoretical specific capacity. The N/S co-doped graphene matrix not only improved the electrical conductivity and hindered the adhesion of the particles, but also buffered the volume of the Co 9 S 8 change and enhanced the electrochemical performance. The testing of SiO 2 /Co 9 S 8 @NSG composite as an anode for lithium-ion batteries (LIBs) revealed an impressive specific capacity with reversible capacity of 850 mA h/g after 900 cycles at a current density of 0.5 A/g and multiplicative capacity of 730 mA h/g at a current density of 0.1 A/g, confirming excellent cycling stability and a Coulombic efficiency close to 100 %. Overall, the proposed doping strategy looks promising for the development of high-performance LIBs.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Xiaoling Sun,Qiaojuan Gong,Yunxia Liang,Mingjie Wu,Nengneng Xu,Pengni Gong,Shuhui Sun,Jinli Qiao
Rational synthesis of bifunctional electrocatalysts with high performance and strong durability is highly demanded rechargeable metal–air battery. In this work, ZIF-derived Co9S8/C coated with conductive graphene nanosheet (Co9S8/GN) was synthesized by a simple solvothermal method and formed a stable double-carbon structure. As expected, the prepared Co9S8/GN catalyst exhibits a high catalytic activity (ΔE: 0.88 V) and long-term durability toward both oxygen reduction reaction and oxygen evolution reaction (ORR and OER), which is even superior to the Pt/C + Ir/C mixture (0.91 V). In addition, the Zn–air battery with the Co9S8/GN catalyst showed higher power density (186 mW cm–2) and more stable charge–discharge cycling performances (2000 cycles) than the Pt/C + Ir/C (118 mW cm–2). Based on these analysis results, the favorable catalytic performance of ORR/OER should be illustrated by the following reasons: (i) large specific surface area and unique mesoporous structure, providing abundant active sites; (ii) good conductivity, accelerating the electrons transfer; and (iii) the unique stable “double-carbon” structures (metal–S–C–C), preventing the agglomeration of metal sulfide, building new quick transfer pathway, and forming the strong electron coupling ability and synergistic effect.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 39
·395401
·
IF 3.551
Peng Zhang,Yang Liu,Min Zhou,Yuxiong Xue,Xianghua Zeng,Junlei Qi,Minghua Chen,Fenglian Sun
Nanostructured transition metal sulfides are promising anode materials for lithium-ion batteries. Nevertheless, it is still a great challenge to prepare capacity-improved electrodes without reducing their rate capability and cycle stability. In this paper, we present a C/Co9S8@SnS2 composite material by loading SnS2 nanocrystals onto MOF-derived C/Co9S8 nanostructures. The C/Co9S8@SnS2 composite has multiple active sites to store lithium ions. The specific capacity reaches 3.1 mAh cm−2 when the current density is 0.224 mA cm−2. The asynchronous electrochemical reaction between Co9S8 and SnS2 offsets the volume expansion of the anode material. Meanwhile, the compact adhesion of carbon layers on the interfaces suppresses the destruction of the anode during the charging–discharging processes. Consequently, the synthesized electrode presents favorable capacity with high current density or under long-term cycling conditions. The prepared battery has a reversible specific capacity of 0.452 mAh cm−2 and a coulomb efficiency of 99.7% after 500 cycles with a high current density of 2.24 mA cm−2. The research results obtained in this work provides a feasible strategy to improve the performance of electrodes systematically.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2022
·Vol. 37
·期 11
·1835-1844
·
IF 2.909
Yang Meng,Zhou Guangyan,Wei Yajuan,Huang Zhengguo,Zhang Jingbo
The catalytic activity of quaternary Cu 2 ZnSnS 4 (CZTS) as counter electrode (CE) of dye-sensitized solar cells (DSSCs) was enhanced by covering Co 9 S 8 on CZTS thin film prepared by the spin-coating method. The effect of the repeating number of spin coating process on morphologies and catalytic properties of CZTS thin films was investigated. When the repeating number of spin coating processes is 3, the CZTS thin film thickness is moderate and the formed nanoparticles are tightly bound. The conversion efficiency of DSSC based on the CZTS thin film CE prepared by 3 spin coating cycles reaches 4.79%. By forming a CZTS/Co 9 S 8 composite electrode via vulcanizing the deposited ZIF-67, the highest photoelectric conversion efficiency of DSSC based on the optimized composite CE further reaches 6.41%. The higher photoelectric conversion efficiency is attributed to the good interfacial transferring of electrons and redox properties for electrolyte of the composite CE. Graphical abstract
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
IONICS
·
2025
·
IF 2.6
Yu Kaifeng,Gong Yanan,Hui A. O.,Liang Ce,Li Yi
Transition metal sulfides exhibit a high theoretical specific capacity and have great potential to be used as a negative electrode material for lithium-ion batteries, but they are prone to produce volume expansion during the cycle process, which leads to the disintegration of the electrode material structure and affects the battery performance. This paper reports the synthesis of high-performance electrode materials, Ni 3 S 2 /Co 9 S 8 /WSCC, a composite of Ni 3 S 2 /Co 9 S 8 nanocages, and wheat straw cellulose carbon (WSCC) by a simple hydrothermal method. This composite structure has the following advantages: (1) two metal sulfides, Ni 3 S 2 and Co 9 S 8 , are introduced simultaneously through the synthesis of nanocages, which can increase the defects and active sites at the interface. At the same time, the nanocage structure helps to buffer the volume change during ion insertion and detachment and promote ion diffusion. (2) The biomass carbon material as a substrate not only plays a supporting role, but also reduces the agglomeration of nanocages, making them have better dispersion. Using it as a lithium-ion battery anode, it has a specific capacity of 535.8 mAh g −1 after 300 cycles at 1 C.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale Research Letters
·
2020
·Vol. 15
·期 1
·1-9
·
IF 3.578
Zhang Xuzi,Shang Chaoqun,Wang Xin,Zhou Guofu
Co 9 S 8 is a potential anode material for its high sodium storage performance, easy accessibility, and thermostability. However, the volume expansion is a great hindrance to its development. Herein, a composite containing Co 9 S 8 nanofibers and hollow Co 9 S 8 nanospheres with N, S co-doped carbon layer (Co 9 S 8 @NSC) is successfully synthesized through a facile solvothermal process and a high-temperature carbonization. Ascribed to the carbon coating and the large specific surface area, severe volume stress can be effectively alleviated. In particular, with N and S heteroatoms introduced into the carbon layer, which is conducive to the Na + adsorption and diffusion on the carbon surface, Co 9 S 8 @NSC can perform more capacitive sodium storage mechanism. As a result, the electrode can exhibit a favorable reversible capacity of 226 mA h g −1 at 5 A g −1 and a favorable capacity retention of 83.1% at 1 A g −1 after 800 cycles. The unique design provides an innovative thought for enhancing the sodium storage performance.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yongpeng Li,Da Lei,Tianyi Jiang,Junling Guo,Xiaoyu Deng,Xu Zhang,Ce Hao,Fengxiang Zhang
Co 9 S 8 can catalyze polysulfides conversion in Lithium sulfur batteries (LSBs) owing to its metallic nature and rich catalytic sites. However, its catalytic activity and chemical adsorption is not strong enough to suppress the shuttle effect of Lithium polysulfides (LiPS) under high sulfur loading. Herein, Phosphorous (P)-doped Co 9 S 8 nanoparticle was synthesized and embedded into 3D Spongy carbon (SC) sheets as electrochemical catalyst for LSBs. Our Density functional theory (DFT) calculations and experimental results revealed that moderate P doping can modulate the electronic structure of Co 9 S 8 and simultaneously improve its interaction with LiPS and promote LiPS conversion. When P-doped Co 9 S 8 nanoparticles are in situ formed and homogeneously distributed on 3D spongy carbon sheet matrix, the resulting P-Co 9 S 8 @SC can ensure good exposure of their adsorption and catalytic sites. As a result, the LSB based on an optimized P-Co 9 S 8 @SC modified polypropylene separator exhibited excellent cycling stability (capacity decay of 0.05% per cycle over 900 cycles at 1 C) and high areal capacity (4.38 mAh cm −2 at 5.6 mg cm −2 sulfur loading at 0.1 C). Our work demonstrates that moderate heteroatom doping is a promising strategy to develop effective polysulfides catalysis.
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
·
2022
·
IF 6.371
Fuling Li,Changgeng Li,Quan Xie,Xuelong Chen,Xiu-Zhi Tang,Tong Guo
Elegant material construction to realize high-efficiency microwave absorption with low filler loading is in strong demand yet remains challenging. Here we combine a self-assembly method followed by pyrolysis to fabricate core-shell Co 9 S 8 @MoS 2 nanocubes, which were uniformly anchored on reduced graphene oxide nanosheets (A-G/Co 9 S 8 @MoS 2 ) to form hierarchical heterostructures . The heterostructure was deliberately designated via chemical etching of in situ formed Co 9 S 8 derived from ZIF-67 and decoration of flower-like MoS 2 nanosheets. Owing to its synergic effect in compositions and well-designed heterostructure, the product A-G/Co 9 S 8 @MoS 2 exhibits excellent microwave absorption performance with low loading content. A minimum reflection loss of − 55.13 dB and effective absorption bandwidth of 6.61 GHz with filler loading of only 8 wt% was achieved, contributed by the good impedance matching and dual loss mechanism. This work provides a new pathway for designing low-filler loading high-performance microwave absorption materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Han Zhang,Xuefeng Bai
Photocatalytic H 2 O 2 production is an eco-friendly technique because only H 2 O, molecular O 2 and light are involved. However, it still confronts the challenges of the unsatisfactory productivity of H 2 O 2 and the dependence on organic electron donors or high purity O 2 , which restrict the practical application. Herein, we construct a type-II heterojunction of the protonated g-C 3 N 4 coated Co 9 S 8 semiconductor for photocatalytic H 2 O 2 production. The ultrathin g-C 3 N 4 uniformly spreads on the surface of the dispersed Co 9 S 8 nanosheets by a two-step method of protonation and dip-coating, and exhibits improved photogenerated electrons transportability and e - -h + pairs separation ability. The photocatalytic system can achieve a considerable productivity of H 2 O 2 to 2.17 mM for 5 h in alkaline medium in the absence of the organic electron donors and pure O 2 . The optimal photocatalyst also obtains the highest apparent quantum yield (AQY) of 18.10% under 450 nm of light irradiation, as well as a good reusability. The contribution of the type-II heterojunction is that the migrations of electrons and holes within the interface between g-C 3 N 4 and Co 9 S 8 matrix promote the separation of photocarriers, and another channel is also opened for H 2 O 2 generation. The accumulated electrons in conduction band (CB) of Co 9 S 8 contribute to the major channel of two-electron reduction of O 2 for H 2 O 2 production. Meanwhile, the electrons in CB of g-C 3 N 4 participate in the single electron reduction of O 2 as an auxiliary channel to enhance the H 2 O 2 production.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Sustainable Systems
·
2019
·Vol. 3
·期 5
·1800167
·
IF 0
Muhammad Sohail Riaz,Xiaotao Yuan,Yantao Zhao,Chenlong Dong,Shuying Nong,Zeeshan Ali,Fuqiang Huang
Innovative nano/microarchitectures, owing to their promising catalytic features, such as abundant active sites, high surface area, and enhanced ion transport, are ideal for oxygen electrocatalysis. Herein, an inventive approach is put forward to fabricate ternary metal sulfide hollow microcubes by a hydrothermal method between spherical porous ZnO with transition metal cations in the presence of urea followed by etching and sulfurization. The significant electrocatalytic activity toward oxygen evolution reaction (OER) with onset potential of 1.48 V (vs reversible hydrogen electrode (RHE)) is obsereved. The objective material shows an overpotential of 320 mV, to achieve a current density of 10 mA cm −2 for OER and excellent robustness with slight variation in potential after long-term chronopotentiometry test for 12 h. As expected, the material also exhibits oxygen reduction reaction (ORR) activity with a half wave potential of 0.8 V (vs RHE) and limited current density of 5.1 mA cm −2 . Meanwhile, further investigations confirm the near four-electron transport pathways for ORR. Such up-bottom etching followed by sulfurization method provide a new concept for engineering porous electrocatalysts.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
危险品化学品经营许可证（带存储）