APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Yanling An,Pan Wei,Meiqiang Fan,Da Chen,Haichao Chen,QiangJian Ju,Guanglei Tian,Kangying Shu
In this study, a dual-shell hollow polyaniline/sulfur-core/polyaniline (hPANI/S/PANI) composite was prepared by successively depositing PANI, S, and PANI on the surface of a template silicon sphere. The electrochemical properties of this composite were evaluated using a lithium plate as an anode in lithium/sulfur cells. The hPANI/S/PANI composite showed a discharge capacity of 572.2 mAh g −1 after 214 cycles at 0.1 C, and the Coulombic efficiency was above 87% in the whole charge/discharge cycle. The improved cycle property of the hPANI/S/PANI composite can be ascribed to the fine sulfur particles homogeneously deposited on the PANI surface and sprawled inside the two PANI layers during the charge/discharge cycle. This behavior stabilized the nanostructure of sulfur and enhanced its conductivity.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2020
·
IF 5.578
Ping He,Xinyi Zhao,Fei Luo,Yi Zhang,Jie Wei,Tianhong Xu,Jiang Wu,Naichao Chen
At the front end of the Electrostatic precipitator (ESP), activated carbon injection is a common method to remove mercury from flue gas, but the high cost, low efficiency and non-recyclability limit the practical application of activated carbon. MoS 2 , a transition metal sulfide with a two-dimensional layered structure, was found to have favourable performances in removing contaminant. In this work, Fe 3 O 4 was successfully grown on the surface of flower-like MoS 2 by two-steps hydrothermal methods. The experimental results showed that the specific surface area of MoS 2 /Fe 3 O 4 (MF) was the largest when the ratio is 10 wt% (MF-10). Compared with pure MoS 2 , the specific surface area of MF-10 increased by 6.7467 m 2 /g, which was attributed to the growth of Fe 3 O 4 . At the same time, the introduction of Fe 3 O 4 made the MF possess superparamagnetism to facilitate its retrievability under an external magnetic field. In addition, MF-10 also showed a mercury removal efficiency of almost 100%. Although the efficiency of the MF-10 has decreased after 5 cycles and 24 h, it could still maintain about 90%, revealing a stable cycle life. Due to its mercury removal performance and recyclability, MF can be considered as a favorable adsorbent for removing elemental mercury.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Teng Li,Ruizi Wang,Zikang Cai,Wenzhe Liu,Jiwei Song,Xixi Wu,Chunyan Cao,Liangjie Yuan
To date, LiCoO 2 has received extensive attention as a cathode material because of its unique characteristics. To satisfy the strong demand for high energy density , the cut-off voltage of LiCoO 2 is continuously increased. However, the structural instability of LiCoO 2 at a high cut-off voltage leads to capacity decay and many safety issues, which hinder further application of LiCoO 2 . Herein, YPO 4 is used to achieve a better electrochemical performance for LiCoO 2 at 4.55 V. In the synthesis process, YPO 4 is transformed into the Li 3 PO 4 and Y 2 O 3 phases, which are basically uniformly incorporated into the particle and form a composite with LiCoO 2 . Owing to the synergistic modification of Li 3 PO 4 and Y 2 O 3 phases, YPO 4 -modified LiCoO 2 materials show enhanced structural stability and excellent cycling performance. Particularly, 1.5% YPO 4 modified LiCoO 2 not only exhibits a reversible discharge capacity of 171.6 mAh g −1 over 500 cycles with 91.7% capacity retention, but also delivers a capacity of 144.5 mAh g −1 at 5 C (1 C = 274 mAh g −1 ). This work suggests that using rare-earth metal phosphates can be an effective strategy to improve the cycling performance of LiCoO 2 at 4.55 V.
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 Environmental Chemical Engineering
·
2024
·
IF 7.4
Liwei Ma,Shihua Zheng,Guoqiang Li,Xuejun Wang,Kangdi Chen,Guojie Zhang
Fe(II)EDTA can remove NO efficiently, but it has not been industrially applied. This is because the oxygen present in the flue gas will oxidize Fe(II)EDTA and Fe(II)EDTA-NO to Fe(III)EDTA and deactivate them. In order to solve this problem, this paper innovatively proposes to use NaHS to reduce Fe(III) EDTA, because NaHS has high reducing ability and low price. Therefore, a series of experimental conditions were explored in order to obtain the best reaction setup. The results indicate that increasing the concentrations of NaHS, temperature, and pH enhances the rate of NaHS reduction. The mechanism of the increase in reduction rate was studied in depth using potentiometric titration. It was found that an increase in OH - concentration will generate S 8 precipitate, which is beneficial to the forward progress of the reaction and promotes the large-scale production of the active component Fe 2+ . Oxygen is an inevitable factor in actual flue gas, so this study innovatively proposed a kinetic model under aerobic conditions and used this model to predict the trend of Fe(III)EDTA reduction by NaHS. On this basis, NO removal experiments were conducted under high oxygen conditions. After 15 cycles, the reduction performance of NaHS was still very high, and the NO removal rate was higher than 70%. The reason for this phenomenon is that the stabilizer exists in a form that is conducive to the removal of NO by the active component Fe 2+ . Therefore, this study provides theoretical guidance for promoting the industrial application of Fe(II) EDTA technology for NO removal.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 332
·期 9
·3787-3798
·
IF 1.6
Liu Nana,Fang Ziyi,Xu Yunan,Xue Miao,Zhan Liyuan,Wang Binliang,Yuan Yijun
In response to the depletion of global uranium reserves and the radioactive contamination of wastewater, there is an urgent need to develop efficient, sustainable, and cost-effective uranium biosorbents. Herein, a green macroalga Rhizoclonium riparium was prepared for uranium (U(VI)) removal. The results showed that the maximum adsorption capacity of U(VI) was 80.96 mg g −1 (pH = 5, 298 K and 0.1 M NaNO 3 ). The kinetics, isotherms and thermodynamics analysis revealed that the adsorption process was chemisorption, homogeneous monolayer adsorption, endothermic and spontaneous. Through the mechanism characterization, it was proved the adsorbed of uranium on R. riparium was mainly controlled by the complexation between U(VI) and –OH, –COOH, –NH 2 . Besides, the R. riparium possess high selectivity towards uranium and good recycling performance. This work highlights new opportunities for biosorbents to be obtained directly from nature and used to remove radioactive contamination.
研究领域:
环境科学
·
生物技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Zheng-Guang Hu,Zhi-Yuan Tan,Zhong Lin,Jun Chen,Fang Sun,Xuyao Tang,Rui-Ting Zheng,Yong-Chong Chen,Guo-An Cheng
Si is one of the most attractive anode materials because of its extremely high theoretical capacity. In this study, we find that the (111) plane of crystalline Si in the anode is still present after 100 cycles and infer that it is the intercalation site of Li + ions. We believe that Li + ions are inserted into the tetrahedral sites of crystalline Si, and the (111) plane of Si collapses; meanwhile, expansion parallel to 〈220〉 crystal orientation occurs. After full lithiation , the crystalline Si is converted to amorphous silicon . In a Si/ composite anode, although the addition of amorphous carbon may improve the cycling performance of Si anode, the activation process is prolonged as the amount of amorphous carbon increased. We determine that amorphous carbon may reduce the diffusion of Li + , which increases the overpotential and results in the lower formation of the saturated Li/Si alloy.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Yingchao Hu,Hongyuan Lu,Hailong Li
Li 4 SiO 4 stands out among various solid sorbents for CO 2 capture. The commonly used mechanical granulation process for Li 4 SiO 4 sorbents causes the destruction of the microstructures. Therefore, with the characteristics of huge production and low cost, an agricultural waste (rice husk) was employed as a pore former to improve the structures of Li 4 SiO 4 pellets and, thus, enhance the cyclic CO 2 sorption performance. The rice husk templating greatly enhanced the CO 2 sorption capacity of Li 4 SiO 4 pellets. Especially, 20 wt% rice husk-templated Li 4 SiO 4 exhibited the capacity of 0.21 g/g, which was nearly twice that of the unmodified sorbent. The quick release of the combustion gases from burning rice husk could create porosity for the sorbents. In addition, the alkaline compositions in rice husk promoted the CO 2 sorption due to the decreased CO 2 diffusion resistance by the formation of molten phases. Moreover, the ashes of rice husk after high-temperature combustion were found to block the pores of the sorbents, leading to the capacity reduction. The comprehensive function of rice husk templating for Li 4 SiO 4 pellets was the tradeoff between the positive effects of pore creation and alkaline doping and the negative effects of pore blockage by the ashes.
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
JOURNAL OF POWER SOURCES
·
2015
·
IF 6.217
Honglai Zhang,Zhaohui Li,Shishun Yu,Qizhen Xiao,Gangtie Lei,Yanhuai Ding
Carbon-encapsulated LiMn 2 O 4 (LMO@C) spheres were prepared using polymer microgel reactor, in which Mn 2+ ions are hydrolyzed in situ to form Mn(OH) 2 , and followed by annealing at a high temperature. The LMO@C spheres are constructed with the spinel LiMn 2 O 4 nanospheres that embedded in a porous carbon matrix uniformly. Owing to possessing three-dimensional (3D) electron-conductive and 3D ion-conductive networks, the LMO@C spheres exhibit high rate capability. They can deliver the specific capacities of 142, 137, 126, 107, and 91 mAh g −1 at the rates of 0.1C, 1C, 5C, 10C, and 20C (1C = 148 mA g −1 ), respectively. Owing to carbon encapsulation, the LMO@C spheres can retain 80% of the initial capacity at 1C rate after 1000 cycles at 25 °C, displaying stable cycling performance. The results suggest that the LMO@C spheres are promising cathode materials for high-power lithium-ion batteries.
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
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 4
·043501
·
IF 4.316
Kailiang Ren,Zeang Duan,Yuan Li,Lu Zhang,Shumin Han
LaFeO3 as a new negative electrode material for nickel-hydrogen batteries used as energy storage has the advantages of high capacity, advanced temperature resistance, and low cost. However, its conductivity and dynamic performance are poor, seriously hindering its applications. In light of increasing concentration of oxygen vacancies and improving conductivity after replacing A-site elements of the material, here we synthesize low-priced Na doping LaFeO3 oxides, La1−xNaxFeO3 (x = 0–0.8), as the negative electrode by a solid-state reaction method. Studies show that doping Na can reduce particle aggregation, thus helping to increase the surface area of LaFeO3. Therefore, its discharge capacity remarkably increases to 356.7 mAh g–1 (x = 0.6) from 178.8 mAh g–1 (x = 0) at 60 °C, which also maintains 73.4% after 100 cycles for La0.4Na0.6FeO3, elevated by 55.1% compared to LaFeO3. In addition, the high rate discharge ability of an La0.4Na0.6FeO3 electrode at a discharge current density of 1500 mA g–1 reaches 30.7% in contrast to 11.2% for undoped LaFeO3. As such, the La0.4Na0.6FeO3 material with superior cycling capacity is proven to be a more promising electrochemical hydrogen storage electrode compared to LaFeO3, which greatly increases the practical application value of the material.
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
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Hao Wu,Wenfang Feng,Michel Armand,Zhibin Zhou,Heng Zhang
Carbonyl-based negative electrodes have received considerable interest in the domain of rechargeable lithium batteries, owing to their superior feasibility in structural design, enhanced energy density, and good environmental sustainability. Among which, lithium terephthalate (LiTPA) has been intensively investigated as a negative electrode material in the past years, in light of its relatively stable discharge plateau at low potentials (ca. 1.0 V vs Li/Li+) and high specific capacity (ca. 290 mAh g–1). However, its cell performances are severely limited owing to the poor quality of the solid-electrolyte-interphase (SEI) layer generated therein. Here, we report the utilization of lithium bis(fluorosulfonyl)imide (LiFSI) as an electrolyte salt for forming a Li-ion permeable SEI layer on the LiTPA electrode and subsequently improving the cyclability and rate performance of the LiTPA-based cells. Our results show that, differing from the reference electrolyte containing the lithium hexafluorophosphate (LiPF6) salt, the electrochemical reductions of the FSI– anions occur prior to the lithiation processes of LiTPA electrode, which is capable of building an inorganic-rich SEI layer containing lithium fluoride (LiF) and lithium sulfate (Li2SO4). Consequently, the lithium metal (Li°)||LiTPA cell shows significantly improved cycling performance than the LiPF6-based reference cell. This work provides useful insight into the reductive processes of the FSI– anions on negative electrodes, which could spur the deployment of highly sustainable and high-energy rechargeable lithium batteries.
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
CHINESE PHYSICS LETTERS
·
2021
·Vol. 38
·期 6
·068201
·
IF 1.483
Jiachao Yang,Jian Zou,Chun Luo,Qiwen Ran,Xin Wang,Pengyu Chen,Chuan Hu,Xiaobin Niu,Haining Ji,Liping Wang
FeSO4 has the characteristics of low cost and theoretical high energy density (799 W⋅h⋅kg−1 with a two-electron reaction), which can meet the demand for next-generation lithium-ion batteries. Herein, FeSO4 as a novel high-performance conversion-reaction type cathode is investigated. We use dopamine as a carbon coating source to increase its electronic conductivity. FeSO4@C demonstrates a high reversible specific capacity (512 mA⋅h⋅g−1) and a superior cycling performance (482 mA⋅h⋅g−1 after 250 cycles). In addition, we further study its reaction mechanism. The FeSO4 is converted to Fe and Li2SO4 during lithium ion insertion and the Fe|Li2SO4 grain boundaries further store additional lithium ions. Our findings are valuable in exploring other new conversion-type lithium ion battery cathodes.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Sustainable Materials and Technologies
·
2021
·
IF 7.053
Zhengwei Wan,Yingchong Huang,Xiaomin Zeng,Xinzhu Guo,Zhuoying Wu,Miaomiao Tian,Gu Wu,Min Ling,Zeheng Li,Xuehui Gao,Chengdu Liang
The binder plays a crucial role in maintaining electrode structure and improving the cycling performance in Li S batteries , especially for high–energy–density batteries. Here, a natural biopolymer peach gum (PG) was developed as sulfur cathode binder for the first time. PG binder owns abundant carboxyls and hydroxyls, which can form strong interaction between Li O and further effectively constrain polysulfides from shuttling. Besides, strong adhesion force and superior mechanical behavior of PG help to keep the electrode integrity and good electrical contact. Therefore, PG@S electrode achieves an impressively high discharge areal capacity of 27.10 mAh cm −2 with sulfur loading of 26.3 mg cm −2 .
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）