ENERGY & FUELS
·
2020
·
IF 3.421
Mao Yang,Zhenghan Li,Wei Chen,Yin Hu,Yichao Yan
The traditional separator plays a significant role in rechargeable lithium-ion batteries due to the customized features that allow ions to transfer freely with low energy barriers. However, in the lithium–sulfur battery, the commercial separator shows feeble ability for promoting the conversion of accumulated long-chain polysulfides to the short-chain polysulfides on the surface of the cathode. In this work, a carbon-intercalated montmorillonite is designed to release the imprisoned capacity of the sulfur cathode by activating the accumulated long-chain polysulfides on the surface of the cathode. Benefiting from the advantages of carbon-intercalated montmorillonite, the lithium–sulfur battery achieves a high discharge capacity of 818 mAh g–1 over 300 cycles at a current density of 1 mA cm–2 with a sulfur loading of 2.6 mg cm–2. The systematic analyses by cyclic voltammetry and AC impedance reveal that the regulation of redox environment on the cathode surface by reducing the accumulated long-chain polysulfides to short-chain sulfides is a scalable solution for constructing the actual lithium–sulfur batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米复合材料
·
电池技术
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Aiping Wu,Chungui Tian,Yanqing Jiao,Qing Yan,Guoyu Yang,Honggang Fu
The visible-light driven, Pt-free photocatalytic H 2 evolution (PHE) is promising for clean and sustainable H 2 production. The construction of the heterojunction structure with intimate contact and good light adsorption ability is important for realizing the high effective PHE. Here, the core-shell structured MoS 2 /CdS hybrids were constructed through “sequential two-step hydrothermal growth” route for Pt-free PHE. In the synthesis, the hierarchical flower-like MoS 2 was firstly obtained through the reaction of ammonium molybdate and excessive thiourea. Subsequently, without need of centrifugation, the cadmium acetate (Cd source) was added into the cooled MoS 2 solution directly followed by a secondary hydrothermal reaction. In the process, the Cd 2+ could react with partially S 2− in MoS 2 (substituted reaction) and with the excessive S 2− ions in solution to generate CdS, resulting in the formation of CdS shell contacted with MoS 2 core. The micro-structure of the composites (such as the thickness and morphology of CdS shell) could be tuned by changing the amount of Mo source and Cd source. In the composites, the CdS on the outside is convenient to absorb the solar light. The intimate contact of CdS and MoS 2 is beneficial to charge transfer. As a result, the MoS 2 /CdS catalyst showed high catalytic activity for PHE under visible light irradiation (λ > 420 nm). The H 2 evolution rate could reach to 775 μmol h −1 (20 mg catalyst), which is much higher than pure CdS (12 μmol h −1 ) and Pt-CdS (64 μmol h −1 ). The good activity should be related with CdS outside shell beneficial for light adsorption and intimate contact of CdS and MoS 2 for easy charge transfer. A series of experiments demonstrate that the formation of the heterojunction can effectively enhance the charge transfer ability and retard the recombination of electron-hole pairs, thus improving PHE activity and alleviating the photocorrosion of CdS component.
研究领域:
材料科学
·
光催化
·
能源化学
·
纳米材料
·
可持续能源
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Jia shunxin,Chen xiuping,Ping Fan,Zhengping Zhao,Feng Chen,Mingqiang Zhong
In solution-based method, the nature of the solvent may play an important role to the nanostructure of Li 2 S/graphene composite. In this paper, considering anhydrous N-methylpyrrolidone (NMP) has good wetting ability with graphene and its function groups has high binding energies with Li 2 S, NMP was used as solvent to prepare Li 2 S/graphene composite. The structure morphology and electrochemical performance of as-prepared Li 2 S/graphene composite were investigated. Results show that numerous of nano-Li 2 S affiliate on graphene surface homogeneously. The existence of these nano-Li 2 S alleviate π-π interaction between graphene sheets, and Li 2 S/graphene composite exhibits honeycomb-like structure with abundant micropores. Due to this special structure, without extra treatment, the as- prepared Li 2 S/graphene composite exhibits improved electrochemical performance, such as high columbic efficiency, high energy capacity, a high rate capability, and a low potential barrier.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
锂离子电池
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2020
·
IF 3.421
Wenbo Jia,Chuanmin Chen,Songtao Liu
The mercury re-emission characteristics and inhibition effect of sodium dithiocarbamate (DTCR) on mercury re-emission in a simulated desulfurization slurry were investigated. The effects of the desulfurization slurry parameters (including slurry temperature, initial pH value, O2 concentration, and Cl– concentration) on mercury re-emission with and without DTCR were explored. Moreover, the kinetic parameters (reaction order, reaction rate constant, and apparent activation energy) of mercury re-emission and inhibition were calculated by the experimental data. The results showed that addition of DTCR could effectively reduce the mercury re-emission from the desulfurization slurry. The mercury re-emission was enhanced with increases of the slurry temperature and initial pH, while O2 and Cl– in the slurry could inhibit the mercury re-emission. Further study shows that the mercury re-emission reaction processes in the desulfurization slurry with and without DTCR are both consistent with the pseudo-first-order kinetics. In the absence of DTCR, the reaction rate constant of mercury re-emission is 0.01888 min–1, and the apparent activation energy is 44.59 kJ/mol. In the presence of 0.002% DTCR, the reaction rate constant of mercury re-emission is 0.01126 min–1 and the apparent activation energy is 49.08 kJ/mol. Moreover, the effects of slurry parameters on the reaction rate constant were also explored. The present findings are valuable for coal-fired power plants to control mercury re-emission from a desulfurization slurry.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2018
·Vol. 30
·期 7
·075402
·
IF 3.404
Lulu Chen,Wenxiu Yang,Xiangjian Liu,Ling Long,Dandan Li,Jianbo Jia
The design of high-efficient and durable bi-functional oxygen electrocatalysts is still a great challenge. In this work, novel Co9S8 nanoparticles/N,S-codoped defect-rich carbon nanotubes (Co9S8/N,S-CNTs) were fabricated by an ingenious template method. CdS nanowires, as a sacrificial template, can be removed simultaneously during the carbonization process without additional post-treatments. The large BET surface area (661.2 m2 g−1) and pore volume (1.49 cm3 g−1) of Co9S8/N,S-CNTs could largely enhance the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) activities by facilitating the mass transportation and exposing more active sites. The abundant defects produced by the evaporation of Cd and S doping could provide more active sites for ORR and OER. Coupling with Co9S8, Co9S8/N,S-CNTs possesses more defects in the carbon skeleton, better electron conductivity, and larger effective electrochemical area. Co9S8/N,S-CNTs not only performs excellent ORR activity with a half-wave potential of 0.821 V but also owns RuO2-like OER activity in alkaline solution. The potential difference (ΔE) between ORR and OER is as low as 0.78 V in 0.10 M KOH. The excellent bi-functional performance enables the potential to be utilized in fuel cells and metal-air batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Junhao Li,Jiajie Pan,Qilan Chen,Guizheng Liu,Tong Li,Lingcai Zeng,Kai Wan,Quanbing Liu,Zhenxing Liang
It is extremely desirable to develop efficient sulfur reduction reaction (SRR) electrocatalysts for lithium-sulfur (Li–S) batteries. In this work, a small intestinal structure sulfur electrocatalyst, viz. Ni 2 P-CNTs@NHCF nanoreactor, is designed by a facile coaxial electrostatic spinning strategy. Experimental results and theoretical calculations indicate that the synergetic effect of Ni–S and Li–P dual chemical bonds between Ni 2 P and lithium polysulfides (LiPSs) optimizes the chemisorption energy of LiPSs and reduces reaction energy barriers from liquid LiPSs to solid Li 2 S, thus achieving the successive immobilization-diffusion-conversion process of sulfur species. As a result, the cell modified with Ni 2 P-CNTs@NHCF catalyst exhibits the excellent reversible capacities and cyclic stability. With the high sulfur loading of 8.13 mg cm −2 and low electrolyte/sulfur ratio of 6 μL mg −1 , it displays a significant initial areal capacity of 13.4 mAh cm −2 and remains 7.1 mAh cm −2 after 80 cycles at 0.1 C. This work offers an effective strategy on rational design of efficient electrocatalysts, and provides considerable insights into the mechanical comprehension of SRR.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Xia Li,Jie He,Jian Lu,Yi Zhou,Yanbo Zhou
Fenton technology performs well in high-risk roxarsone (ROX) removal, but it is limited by the high H 2 O 2 transportation and storage risks. Herein, FeS 2 decorated resorcinol-formaldehyde resins (FeS 2 -RFR) were successfully prepared to in-situ produce and utilize H 2 O 2 for efficient removal of ROX. Under solar light illumination, resorcinol-formaldehyde resins (RFR) efficiently generated a high concentration of H 2 O 2 , with a yield of 500 μmol g −1 h −1 . FeS 2 can in-situ decompose H 2 O 2 to generate · OH, participating in the oxidation of ROX. As a result, the FeS 2 -RFR catalyst degraded more than 97% of ROX within 2 h and ROX was selectively degraded into low-toxic As(V), which can be simply removed by traditional adsorption or precipitation processes. During the degradation of ROX, · OH played a dominant role. Moreover, the cations (Na + , K + , and Ca 2+ ), anions (SO 4 2− , Cl − ), and humic acid had no noticeable inhibition effect on ROX removal. Furthermore, FeS 2 -RFR can still remove 70% of ROX even after three cycles, proving that this in-situ photo-Fenton system exhibited stability. This study innovatively proposed a double-active site FeS 2 -RFR photocatalyst for in-situ production and activation of H 2 O 2 and showed a sustainable and eco-friendly way for organoarsenic compounds degradation.
研究领域:
环境科学
·
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
International Journal of Extreme Manufacturing
·
2022
·Vol. 5
·期 1
·015502
·
IF 10.036
Zhibin Jiang,Lujie Jin,Xiying Jian,Jinxia Huang,Hongshuai Wang,Binhong Wu,Kang Wang,Ling Chen,Youyong Li,Xiang Liu,Weishan Li
Lithium-sulfur (Li-S) batteries can provide far higher energy density than currently commercialized lithium ion batteries, but challenges remain before it they are used in practice. One of the challenges is the shuttle effect that originates from soluble intermediates, like lithium polysulfides. To address this issue, we report a novel laminar composite, N,O-carboxymethyl chitosan-reduced graphene oxide (CC-rGO), which is manufactured via the self-assembly of CC onto GO and subsequent reduction of GO under an extreme condition of 1 Pa and −50 °C. The synthesized laminar CC-rGO composite is mixed with acetylene black (AB) and coated on a commercial polypropylene (PP) membrane, resulting in a separator (CC-rGO/AB/PP) that can not only completely suppress the polysulfides penetration, but also can accelerate the lithium ion transportation, providing a Li-S battery with excellent cyclic stability and rate capability. As confirmed by theoretic simulations, this unique feature of CC-rGO is attributed to its strong repulsive interaction to polysulfide anions and its benefit for fast lithium ion transportation through the paths paved by the heteroatoms in CC.
研究领域:
材料科学
·
能源存储技术
·
电化学
✓ 已验证
DOI
高影响因子
Nano Research
·
2023
·Vol. 17
·期 3
·1473-1481
·
IF 9.9
Ouyang Yue,Li Xiaoxiao,Zhu Jiexin,Zong Wei,Dai Yuhang,Gao Xuan,Zhang Wei,Yang Shengyuan,Bagherzadeh Roohollah,Lai Feili,Miao Yue-E.,Liu Tianxi
The shuttle effect induced by soluble lithium polysulfides (LiPSs) is known as one of the crucial issues that limit the practical applications of lithium-sulfur (Li-S) batteries. Herein, a titanium dioxide nanoparticle embedded in nitrogen-doped porous carbon nanofiber (TiO 2 @NCNF) composite is constructed via an interface-induced polymerization strategy to serve as an ideal sulfur host. Under the protection of the nanofiber walls, the uniformly dispersed TiO 2 nanocrystalline can act as capturing centers to constantly immobilize LiPSs towards durable sulfur chemistry. Besides, the mesoporous microstructure in the fibrous framework endows the TiO 2 @NCNF host with strong physical reservation for sulfur and LiPSs, sufficient pathways for electron/ion transfer, and excellent endurance for volume change. As expected, the sulfur-loaded TiO 2 @NCNF composite electrode presents a fabulous rate performance and long cycle lifespan (capacity fading rate of 0.062% per cycle over 500 cycles) at 2.0 C. Furthermore, the assembled Li-S batteries harvest superb areal capacity and cycling stability even under high sulfur loading and lean electrolyte conditions.
研究领域:
材料科学
·
电化学
·
纳米技术
·
储能
·
高分子化学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Jianfeng Fan,Mengwen Yan,Jiarong Huang,Liming Cao,Yukun Chen
To expand the application of shape memory materials in situations where elevated temperature and corrosion resistance are required, novel heat-triggered shape memory (HSM) fluorosilicon thermoplastic vulcanizates (TPVs) were designed via core–shell dynamic vulcanization. When the fluororubber (FKM)/silicone rubber (SR) ratio reached 1:1, excellent shape fixity (Rf ∼ 96%) and shape recovery ratios (Rr ∼ 98%) were achieved at the suitable switching transition temperature (Ttrans) of 160 °C. The influence of core–shell structure on shape memory behavior mainly comes from the following aspects: the improvement of interfacial compatibility promoting stress delivery between polyvinylidene fluoride (PVDF) and SR/FKM phases in the shape fixing and shape recovery process and the reduced number-average rubber particle size caused by the appropriate interfacial compatibility facilitating the increasing of interface area, which improved the nucleation density and induced abundant tiny crystals in the blends. Additionally, the formation of core–shell structure also endowed the TPVs with improved mechanical properties.
研究领域:
高分子材料科学
·
功能材料
·
智能材料
·
形状记忆聚合物
·
复合材料工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Zihao Li,Xiaogang Li,Youhao Liao,Xiaoping Li,Weishan Li
We report a novel composite of sulfur loaded in micropore-rich carbon aerogel (CA-S), as cathode of lithium-sulfur battery. Carbon aerogel (CA) is synthesized through phenol-formaldehyde reaction with a low catalyst concentration and carbonization under high temperature, and loaded with sulfur via chemical deposition and heat treatment. The physical properties of the resulting CA and the electrochemical performances of the resulting CA-S are investigated by scanning electron microscopy, thermal gravimetric analysis , Brunauer-Emmett-Teller characterization, electrochemical impedance spectroscopy , and galvanostatic discharge/charge test, with a comparison of a common carbon material, acetylene black (AB), and sulfur loaded in AB (AB-S). It is found that the CA is micropore-rich with micropore volume over 66% of total pore volume , and the CA-S exhibits significantly improved cyclic stability compared with AB-S. The improved performance of CA-S is attributed to the confinement of the micropores in CA to small sulfur allotropes and corresponding lithium sulfides.
研究领域:
电化学
·
能源材料
·
纳米材料
·
储能技术
✓ 已验证
DOI
高影响因子
Small
·
2018
·Vol. 14
·期 11
·1703279
·
IF 9.598
Qian Wang,Minghui Yang,Zhen-Bo Wang,Chao Li,Da-Ming Gu
Shuttle effect of the dissolved intermediates is regarded as the primary cause that leads to fast capacity degradation of Li–S battery. Herein, a microporous carbon-coated sulfur composite with novel rambutan shape (R-S@MPC) is synthesized from microporous carbon-coated rambutan-like zinc sulfide (R-ZnS@MPC), via an in situ oxidation process. The R-ZnS is employed as both template and sulfur precursor. The carbon frame of R-S@MPC composite possesses three kinds of pores that are distinctly separated from each other in space and are endowed with the exclusive functions. The central macropore serves as buffer pool to accommodate the dissolved lithium polysulfides (LPSs) and volumetric variation during cycling. The marginal straight-through mesoporous, connected with the central macropore, takes the responsibility of sulfur storage. The micropores, evenly distributed in the outer carbon shell of the as-synthesized R-S@MPC, enable the blockage of LPSs. These pores are expected to perform their respective single function, and collaborate synergistically to suppress the sulfur loss. Therefore, it delivers an outstanding cycling stability, decay rate of 0.013% cycle −1 after 500 cycles at 1 C, when the sulfur loading is kept at 4 mg cm −2 .
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
功能材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）