SN Applied Sciences
·
2020
·Vol. 2
·期 7
·1156
·
IF 0
Liu Honghong,Thomas Tiju,Li Rongrong,Shen Hangjia,Wang Jiacheng,Yang Minghui
Lithium sulfur (Li–S) batteries are next general energy storage systems due to their high thereotical energy density, low cost and environmental friendly. Herein, we develop a composite polysulfide mediator based on carbon nanotubes enwrapped by zinc sulfide (CNTs@ZnS) nanoparticles as multifunctional host materials for sulfur cathode. The ZnS nanoparticles is uniformed coating on the outside layer of functionalized carbon nanotubes. The unique structure of CNTs@ZnS ensure the chemical adsorption on ZnS and fast electron transfer from ZnS to carbonnanotubes. The presence of ZnS efficiently alleviates the shuttle effect of soluble lithium polysulfide intermediates and hence offers a mean to further enhancing the reaction activity via sulfophilic property of ZnS and catalytically accelerate the conversion of polysulfides to insoluable Li 2 S. The high conductivity of carbon nanotubes results in rapid electron transfer. The CNTs@ZnS cathode offers an excellent specific capacity of ~ 1003 mAh g −1 after 100 cycles at 0.2C. Furthermore significant cycling performance at 0.2C with 3.1 mg cm −2 sulfur loading for 500 cycles is observed with 0.05% capacitance decay per cycle. The results provide insights to develop high-performance Li–S batteries based on multifunctional host materials.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米科技
·
功能材料
✓ 已验证
DOI
JOURNAL OF SOLID STATE CHEMISTRY
·
2017
·
IF 2.299
Yuan-Zi Xu,Cheng-Zong Yuan,Xue-Ping Chen
To design highly efficient and low-cost electrocatalysts for oxygen evolution reaction (OER) is a great challenge for electrochemical water splitting. Here we introduce a simple and cost-effective strategy for one-step synthesis of a three-dimensional Ni 3 S 2 /MoS X (x is close to 3) nanosheets on Ni foam (NF) via a sovelthermal reaction. The electrochemical performance of the Ni 3 S 2 /MoS X nanosheets on NF has been investigated and exhibits superior OER electrocatalytic activity as well as excellent electrochemical durability. As a novel non-noble-metal OER catalyst operating in basic electrolytes, this 3D cathode exhibits an onset overpotential of as low as 165 mV, a Tafel slope of 67.5 mV dec −1 and remarkable long-term stability. This catalyst maintains its catalytic activity for at least 14 h and only affords 50, 100, and 150 mA cm −2 OER current densities at overpotentials of 215 mV, 265 mV and 305 mV respectively.
研究领域:
材料科学
·
电化学
·
能源化学
·
纳米科技
·
催化化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 8
·期 2
·789-796
·
IF 10.733
Yangyang Zhan,Zhibin Shao,Tianhao Jiang,Jing Ye,Xiaofeng Wu,Bingchang Zhang,Ke Ding,Di Wu,Jiansheng Jie
Two-dimensional (2D) vertical heterojunctions possess peculiar electronic and optoelectronic properties according to their complementary composition, ultrathin thickness, and unique geometry. However, it is still a challenge to synthesize 2D vertical heterojunctions based on non-layered materials due to strong covalent bonds and abundant surface dangling bonds. Here we developed a partial cation exchange method for the synthesis of 2D vertical Cu2S/CdS heterojunctions. Large-size and single-crystalline CdS nanosheets prepared by a van der Waals epitaxy method served as host lattices for cation exchange reactions. The evolution of the nanosheets in terms of their morphology, composition and crystal structure was elaborately characterized. The as-prepared 2D vertical heterojunctions have two-layer ultra-thin structures and form large-area junctions at their interfaces. Under light irradiation, the photogenerated electron–hole pairs can be quickly separated under the electric field in the junction region, minimizing the possibility of charge recombination. As a result, the device based on 2D vertical Cu2S/CdS heterojunctions exhibits a higher photoelectric conversion capability compared with the device based on single-component 2D CdS or Cu2S Schottky junctions. Our work opens up opportunities to explore 2D vertical heterojunctions based on non-layered materials for high-performance optoelectronic devices.
研究领域:
材料科学
·
纳米科技
·
半导体物理
·
光电子学
·
能源材料
✓ 已验证
DOI
高影响因子
Nano Energy
·
2019
·
IF 15.548
Nan Wei,Jingsheng Cai,Ruochen Wang,Menglei Wang,Wei Lv,Haina Ci,Jingyu Sun,Zhongfan Liu
Lithium–sulfur battery is amongst the most promising next-generation energy storage technology owing to their high theoretical capacity and energy density . Nevertheless, the notorious shuttle effect of lithium polysulfides (LiPSs) seriously impedes its practical applications. Here, we report an all-CVD approach to realize the direct growth of ReS 2 @N-doped graphene (NG) heterostructure , which serves as an ultralight high-performance interlayer for elevated LiPS regulation via easy transfer onto the commercial separator. In contrast to the traditional interlayers constructed via vacuum filtration of nanostructured materials that inevitably increase the thickness and weight of the separator, our all-CVD-enabled ReS 2 @NG film possesses an area of 15 mm × 100 mm, a thickness of ~0.5 μm and a negligible areal weight of 80–90 μg cm −2 . Benefiting from the two-dimensional (2D) vertically-erected nanostructure , adsorptive ReS 2 -conductive NG interface, and favorable electrical conductivity , thus-derived ReS 2 @NG interlayer readily enhances reaction kinetics for LiPS conversion and boosts the reutilization of trapped LiPS whilst guaranteeing smooth transportation of lithium ions . Accordingly, an initial discharge capacity of 854 mAh g −1 with an average capacity decay of 0.064% per cycle after 800 cycles can be harvested at 2.0 C. Even at a high sulfur loading of 6.4 mg cm −2 , an initial areal capacity of 6.1 mAh cm −2 can be gained, which still retains 5.8 mAh cm −2 after 40 cycles at 0.1 C. This work is anticipated to shed light upon the construction of CVD-enabled versatile 2D heterostructures for enriching the interlayer design with multifunctionality and cost-effectiveness.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
界面工程
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Yufen Yan,Yayu Guo,Huadong Zheng,Liang Qi,Yutao Yang,Yanli Miao,Xixi Shi,Lianqi Zhang,Chunliang Li,Dawei Song
Development of sulfide solid-state electrolytes (SSEs) with high ionic conductivity plays a leading role in achieving all-solid-state sodium batteries (ASSSBs). As an important raw material for synthesizing sulfide SSEs, the purity of Na 2 S significantly affects the ionic conductivity and electrochemical properties of sulfide SSEs. In order to obtain high-purity and low-cost Na 2 S, a hydrogen reduction of industrial grade Na 2 SO 4 followed by ethanol purification has been successfully employed to synthesize and purify Na 2 S, which possesses a high purity of 98 %. Na 3 SbS 4 has been synthesized by as-synthesized Na 2 S (A-Na 2 S) and commercial Na 2 S (C–Na 2 S) by liquid-phase synthesis and solid-state reaction methods, respectively. The electrochemical properties indicate that Na 3 SbS 4 samples synthesized by A-Na 2 S possess higher ionic conductivity and lower Ea, and the assembled ASSSBs exhibit higher specific capacities, superior cycle and rate performance. At 0.5C, the assembled TiS 2 /Na 3 SbS 4 /NaSn ASSSB exhibits a high initial capacity of 211.4 mAh g −1 with capacity retention of 96.2 % after 360 cycles at room temperature. This work provides a simple approach for synthesizing high-purity Na 2 S at low cost, enabling the large-scale application of sulfide SSEs for ASSSBs.
研究领域:
材料科学
·
电化学
·
固态离子学
·
能源存储
·
无机合成
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Qi Jin,Kaixin Zhao,Xitian Zhang
The lithium–sulfur (Li–S) battery is an appealing choice for the next-generation high-energy-density energy storage systems . However, side reactions between lithium polysulfides (LiPSs) and Li metal anode cause the growth of Li dendrites, loss of active materials, and safety issues, which severely hinders the practical application of Li–S batteries. Constructing a protection layer on the surface of Li anode is an effective strategy to shield LiPSs and regulate lithium uniform deposition in Li–S batteries. Herein, we design and fabricate a lithiated Nafion protective layer to alleviate the side reactions between LiPSs and the Li anode and guide uniform deposition of Li, in which, their mechanism is investigated. The optimal protective layer effectively protects the Li anode from the detrimental side reactions, which boosts the stability of the Li anode. Li–Li and Li-stainless steel cells with 4 M [S] Li 2 S 8 electrolyte can last for more than 400 cycles and 100 cycles at current density of 1 mA cm −2 . A Li–S full cell also exhibits a high reversible capacity of 791.5 mA h g −1 after 250 cycles at 0.5 C. This work reveals the vital role of the artificial protective layer in enhancing the stability of the Li anode in Li–S batteries.
研究领域:
电化学
·
能源材料
·
电化学储能
·
电池技术
·
界面化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Lina Wang,Peiyi Yan,Huairui Chen,Zhuo Li,Shu Jin,Xiaoxiang Xu,Jun Qian
Narrow bandgap semiconductor MgIn 2 S 4 has been readily grown onto In 2 O 3 nanofibers by an in situ growing method. The so-formed MgIn 2 S 4 -In 2 O 3 hybrid nanofibers are characterized by strong visible light absorption and intimate MgIn 2 S 4 /In 2 O 3 heterointerfaces. Under visible light illumination ( λ ≥ 400 nm), the hybrid nanofibers demonstrate an exceptionally high photocatalytic activity for Escherichia coli ( E. coli ) disinfection, outcompeting pristine MgIn 2 S 4 , naked In 2 O 3 nanofibers, and many other photocatalytic systems reported. Specifically, the hybrid nanofibers achieve a 7 log reduction in viable cells for merely 20 min illumination while pristine MgIn 2 S 4 and naked In 2 O 3 nanofibers alone are almost inactive. Further analysis indicates that the hybrid nanofibers essentially form a type-II semiconductor heterojunctions which enable spatial separation of photocarriers. Owing to the intimate heterointerfaces, photocarriers can be promptly separated and accumulated respectively in In 2 O 3 and MgIn 2 S 4 thereby allowing continuous generation of copious reactive species for disinfection. This work signifies the usefulness of heterointerfaces in promoting photocarrier separation and provides a useful strategy to upgrade photocatalytic performance from otherwise almost inactive semiconductors.
研究领域:
材料科学
·
光催化
·
纳米材料
·
环境科学
·
微生物学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Biao Feng,Chengzhang Yao,Siyu Chen,Rui Luo,Shuhui Liu,Shanshan Tong
The design and synthesis of efficient adsorbing materials for recovery of precious metal are of paramount importance for fulfilling high-tech industry’s need. Herein, a one-step hydrothermal synthesis method was employed to construct the sulfur-rich MoS 2 nanoflakes under a mild condition. The first experiment evidence proved that MoS 2 nanoflakes were capable of capturing gold, with an extremely high uptake capacity (1133 mg g −1 ) and excellent selectivity. More importantly, MoS 2 nanoflakes showed preferential Au 3+ uptake behaviour compared with other precious metal ions such as Pd 2+ (47.6 mg g −1 ) and Pt 4+ (38.5 mg g −1 ). Different factors affecting the sorption process such as pH, adsorbent amount, contact time, ion strength , and reusability were systematically studied. The adsorption mechanism may be attributed to their intrinsically sulfur-rich characteristic for the strong soft–soft interactions between S atoms and Au atoms. These findings open up the possibility to expand the applications of sulfur-rich nanomaterials in the recovery of precious metal.
研究领域:
材料科学
·
环境化学
·
纳米技术
·
资源回收
·
配位化学
✓ 已验证
DOI
高影响因子
Results in Physics
·
2023
·
IF 5.3
Meijie Zhu,Hua Xu,Zuoquan Tan,Le Wang
Large-area and uniform two-dimensional (2D) non-layered α-MnSe was successfully synthesized via the molecular sieve modified chemical vapor deposition (CVD). The molecular sieve serves both as a filter and a container to controllable release the Mn precursor in a stable and much lower concentration, leading to the uniform growth of 2D α-MnSe flakes. The thickness, crystalline quality and uniformity of the as-grown α-MnSe are further characterized. Our study validated the positive role of molecular sieve in the controllable growth of 2D α-MnSe, which is believed to be applicable to other non-layered transition metal chalcogenides (TMCs) and will be beneficial for their further applications in electronics, optoelectronics and spintronics.
研究领域:
材料科学
·
纳米科技
·
凝聚态物理
·
无机化学
✓ 已验证
DOI
高影响因子
CORROSION SCIENCE
·
2018
·
IF 4.862
Jie Qiu,Bin Leng,Huajian Liu,Digby D. Macdonald,Angjian Wu,Yanyan Jia,Wandong Xue,Guojun Yu,Xingtai Zhou
The effect of SO 4 2− on the corrosion behavior of 316 L stainless steel (SS) in molten FLiNaK (LiF-NaF-KF: 46.5–11.5–42 mol.%) salt was studied. Results reveal that the SO 4 2− in the salt remarkably accelerates the corrosion of 316 L SS by promoting the dissolution of Cr, leading to increasing intergranular corrosion of the alloy. On the other hand, the results of structural characterization indicate that the SO 4 2− can react with Mn to form MnS at the grain boundaries of the alloy. The galvanic couple between MnS and steel matrix could further accelerate the intergranular corrosion of 316 L SS in molten fluoride salt environments.
研究领域:
材料科学
·
腐蚀科学
·
无机化学
·
核工程材料
·
高温电化学
✓ 已验证
DOI
高影响因子
POWDER TECHNOLOGY
·
2018
·
IF 3.23
Hui Liu,Sen Zhao,Zhengwen Xie,Kai Zhu,Xiaomeng Xu,Xuhan Ding,Adam Glowacz
The pyrophoric tendency of the powder of corrosion products and deposits in oil tanks was investigated by performing several series of tests in a modified self-heating experimental apparatus based on the crossing point temperature method. Three samples of the powder of corrosion products and deposits in oil tanks as well as a ferrous sulfide were used as test samples. The corresponding apparent activation energies ( E a s) were obtained: 26.1 kJ mol −1 for the corrosion products of a crude oil storage tank, 27.2 kJ mol −1 for the middle distillate oil storage tanks, and 43.5 kJ mol −1 for ferrous sulfide; the unexposed cross-point for deposits of a crude oil storage tank was at a temperature below 250 °C. Those values of E a s indicated that the corrosion products of the two oil storage tanks showed a stronger pyrophoric tendency than did the deposits of the crude oil storage tanks and ferrous sulfide. Furthermore, the E a values were similar to those of reactions reported for the incomplete oxidation of hydrogen sulfide (H 2 S), thus supporting the viewpoint that H 2 S may be considered the intermediate product for accelerating the self-heating and self-ignition of sulfide at temperatures below 250 °C and may play a major role in inducing fires and explosions in storage oil tanks. In addition, possible sources of H 2 S in self-heating of the corrosion product were largely caused by thermochemical sulfate reduction or thermal decomposition of the organic matter of oil tanks.
研究领域:
化学工程
·
安全工程
·
石油储运
·
燃烧学
·
材料腐蚀与防护
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Xingchao Zhang,Ruoyu Zhang,Siying Niu,Jiming Zheng,Chongfeng Guo
The MoS 2 /g-C 3 N 4 heterojunction composite (marked as MoS 2 /g-C 3 N 4 -H) was successfully prepared via calcining the melamine coated MoS 2 nano-sphere, where the thin g-C 3 N 4 nano-sheets were tightly grown on the surface of MoS 2 nano-sphere to form MoS 2 inlaying in g-C 3 N 4 heterostructure. The detailed charge transfer mechanism was discussed by combining theoretical calculation and experiments, in which the intrinsic cause of photo-generated charge separation and transfer was determined as the directional built-in electric field driven by different Fermi levels of MoS 2 and g-C 3 N 4 . Comparatively, the enhanced photo-catalytic performance and stability of the sample were assessed by degrading the Rhodamine (RhB) and reducing the Dichromate (Cr 6+ ) solutions under the irradiation of the simulated sunlight, which could be attributed to the widened spectral absorption range and improved electron-hole separation rate. Based on above results, the photo-catalytic mechanism involving redox reactions was also clearly proposed.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
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