JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 12
·123509
·
IF 4.316
Xianglin Liu,Yongsong Ma,Peng Li,Huayi Yin,Dihua Wang
MoB2 is synthesized by the electrochemical reduction of solid MoS2/B mixture in molten NaCl-KCl at 700 °C. Unlike the traditional methods, the electrolysis method employs the low-cost MoS2 feedstock and the boronization reaction happens at a low temperature of 700 °C. The electrochemically induced boronization involves two steps: the electrochemical desulfurization to generate Mo and the reaction of Mo with B to form MoB2. The S2− released from the reduction of MoS2 transfers to the carbon anode and is oxidized to sulfur gas, realizing a green synthetic process. In addition, the influences of molar ratio of MoS2 and amorphous boron and electrolysis cell voltage on the phase composition and morphology of electrolytic products were studied. The obtained MoB2 particles possess a uniform nodular morphology. Overall, this paper provides a straightforward and green process to prepare MoB2 nanoparticles using economically affordable raw materials at low temperature, and this method can be extended to prepare other borides.
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高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Shouhui Chen,Rihui Zhou,Yaqin Chen,Ping Li,Yonghai Song,Li Wang
Zeolitic imidazolate frameworks are a class of metal organic frameworks which are very attractive for their pore structures. However, their pore size and the BET surface would shrink when they underwent heat treatment at high temperature. On the other hand, liquid metal in MOFs might flow through the pores and prevent the shrinkage when pyrolysis. As is known that metallic Sn is liquid when the temperature is above 232 °C, flowing Sn might support and maintain the porous structure of MOFs during the pyrolysis. In this work, porous Sn/C-ZnO core-shell structures were prepared as anodes for LIBs via a two-step method. Firstly, SnO 2 particles were encapsulated in a ZIF-8 layer with different thickness. Then Sn/C-ZnO was generated in inert atmosphere at 700 °C. A Sn/C-ZnO composite, with 11.2% of Sn and 21.0% of ZnO in content, had a BET surface of 32.9 m 2 g -1 . Another Sn/C-ZnO composite, with 55.1% of Sn and 1.8% of ZnO in content, had a larger BET surface of 297 m 2 g -1 . Then the two composites were tested as anodes for LIBs. Although the BET surface of the former was significantly less than that of the latter before cycling and the content of Sn in the former was also much lower than that of the latter, the discharge capacity of the former after 50 cycles was 515.6 mAh g -1 at 100 mA g -1 in the potential of 0.01~3.00 V, which was slightly higher than that of the latter.
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高影响因子
Journal of Energy Storage
·
2021
·
IF 6.583
XianYan Jiang,ShuPing Deng,JunJie Liu,Ning Qi,ZhiQuan Chen
In this work, metal oxide/metal@carbon (NiO/Ni@C) composites as electrode materials have been successfully prepared using the pillared Ni 2 (bdc) 2 (dabco) (bdc = 1,4-benzenedicarboxylic acid, dabco = 1,4-diazabicyclo[2.2.2]-octane) as the precursor. Owing to the multiple active sites (NiO, Ni and Carbon), rich oxygen defects, and abundant Ni 3 + , the NiO/Ni@C composites show excellent electrochemical performance. A maximum specific capacitance of 805.3 F g −1 at 0.5 A g −1 and 576.2 F g −1 at 10 A g −1 is obtained for the NiO/Ni@C electrode material calcined at 500 °C, indicating a high rate capability. Meanwhile, the assembled asymmetric supercapacitor (ASC) NiO/Ni@C//PEDOT-AC (poly(3,4-ethylenedioxy-thiophene)-activated carbon) has a wide working voltage of 0–1.7 V, high specific energy of 20.7 W h kg −1 , superior specific power of 12920 W kg −1 , and excellent cycle stability with capacitance retention of 69.7% after 10 000 cycles. Furthermore, a red light-emitting diode (LED) is lighted up by two NiO/Ni@C//PEDOT-AC ASCs in series connection.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Pijun Duan,Yuanfeng Qi,Shanshan Feng,Xiaoming Peng,Wei Wang,Yue Yue,Yanan Shang,Yanwei Li,Baoyu Gao,Xing Xu
FeMn bimetallic nanoparticles coated with nitrogen-doped graphene shells (FeMn@N-C) were prepared to decompose clothianidin (CTD) through activation of peroxymonosulfate (PMS). The redox cycles of encapsulated FeMn bimetallic nanoparticles with multiple valence states could accelerate the radical generation and ensure the stability of FeMn@N-C with continuous PMS activation. Coexisting NaH 2 PO 4 could unusually accelerate CTD degradation through facilitating reactive oxygen species (ROS) generation and decreasing bonding dissociation energies of CTD molecule. DFT calculation indicated that the C-Cl bond in CTD molecule was weakened after being surrounded by NaH 2 PO 4 . Two main degradation pathways were proposed in the absence of phosphate and a new dechlorination pathway was first reported after CTD molecule bonding with phosphate, which was confirmed by DFT. This work provides a feasible strategy of PMS activation by graphene coated bimetallic nanoparticles and give a new insight into accelerated degradation of recalcitrant pollutants with phosphate surrounding.
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高影响因子
Energy Storage Materials
·
2018
·
IF 0
Jing Xia,Li Liu,Sidra Jamil,Jianjun Xie,Hanxiao Yan,Yiting Yuan,Yue Zhang,Su Nie,Jing Pan,Xianyou Wang,Guozhong Cao
The development of flexible energy storage devices is the key to widen the application of flexible electronics and wearable devices . Flexible electrodes with superior electrochemical performance are critical components for flexible energy storage devices. Herein, we propose a simple and versatile electrospinning strategy to prepare the SnS/C nanofibers (SnS/C NFs) film. By using SnS/C NFs film directly as a free-standing anode in both lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs), it can provide outstanding electrochemical performance. For LIBs, it delivers high capacities of 648 and 548 mA h g -1 at 200 and 500 mA g -1 respectively after 500 cycles. It even shows outstanding cyclability for 1000 cycles. For SIBs, it retains capacity of 481 mA h g -1 after 100 cycles at 50 mA g -1 . Moreover, the capacity remains as high as 349 mA h g -1 at 200 mA g -1 after 500 cycles. The outstanding electrochemical performance is mainly attributed to the fact that the fine SnS nanoparticles dispersed in one-dimensional porous nanofibers with uniform diameters around 130 nm shorten the transport path of ions and electrons, and the presence of N-doped carbon enhanced the electrical conductivity as well as relieve the volume change caused by the alloying/de-alloying reaction. Besides, the ultra-robust mechanical flexibility of SnS/C NFs film makes it a promising anode candidate for flexible LIB and SIB in future.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Yehui Guan,Fangmeng Liu,Bin Wang,Xue Yang,Xishuang Liang,Hui Suo,Peng Sun,Yanfeng Sun,Jian Ma,Jie Zheng,Yue Wang,Geyu Lu
In this paper, a novel amperometric CO sensor using Nafion and Pt/C composite electrodes was fabricated. Three kinds of carbon materials (carbon fibers, multiwall carbon nanotubes and carbon blacks) were utilized as the supports of the sensing and reference electrodes for the CO sensors. The results revealed that the effective Pt loadings on the electrodes increased in the following order: carbon fibers (CFs) > multiwall carbon nanotubes (MWCNTs) > carbon blacks (CBs), leading to the increasing of the sensitivities toward CO in same order. In other words, the sensor using Pt/CFs as the sensing electrode (SE) showed the highest sensitivity with the value of 0.077 μA/ppm and shortest response time in the range of CO concentration from 1 to 200 ppm at room temperature . Further, a reproducible and stable response against 50 ppm CO was obtained for the sensor with Pt/CFs SE materials . Moreover, a low detection limit of 0.1 ppm for CO was also examined, suggesting that the sensor can be convenient for detecting very low traces of CO.
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高影响因子
CARBON
·
2019
·
IF 7.466
Yudi Mo,Junchen Liu,Chao Meng,Min Xiao,Shan Ren,Luyi Sun,Shuanjin Wang,Yuezhong Meng
The low electronic conductivity and poor Li + diffusion coefficient of conventional LiFePO 4 (LFP) materials severely impede its high-rate applications for lithium-ion batteries (LIBs). To break these limits, one novel poly(1,3-diethynylbenzene) (PAB) acetylenic carbon-rich polymer with extremely high-carbon content (96.75 wt%) and good solubility has been prepared by an oxidative coupling reaction. One definite advantage is that this carbon-rich PAB polymer will release, upon pyrolysis , very low amounts of gas, forming therefore uniform and dense highly conductive carbon network. Besides, the specific resistivity of continuous PAB-C layer can be as low as ∼0.01 Ω cm, which can effectively improve electrical conductivity and maintain mechanical integrity of LFP cathode. As a result, the prepared LFP@PAB-C nanocomposites with approximately 3.8 wt% carbon content and 2.5 nm carbon layer exhibit an excellent high-rate capability, e.g. even at a considerable discharge rate of 50 C, while the capacity can still be remained at 129.6 mA h g −1 . Moreover, the LFP@PAB-C nanocomposites also reveal a remarkable cycling stability with as high as 100.6% capacity retention at 20 C over 1000 cycles. This kind of LFP@PAB-C composite was demonstrated to be an ideal cathode material for high-power LIBs.
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高影响因子
Energy & Environmental Materials
·
2021
·Vol. 5
·期 2
·543-554
·
IF 15.122
Yu Ma,Ding Chen,Weijun Li,Yapeng Zheng,Lin Wang,Gang Shao,Qiao Liu,Weiyou Yang
The design of efficient cathode with great cycle performance, high flexibility, and low cost is essential for the commercialization of zinc–air battery (ZAB). Herein, we report the exploration of freestanding bifunctional cathode with rationally designed structures, namely, tiny Co nanoparticles embedded in N-doped carbon nanofiber aerogels, which have desired features including uniform Co dispersity, balanced distribution of N-C species, hierarchically porous structure with increased fraction of meso- to micropores, and moderate amounts of defects. Accordingly, the as-fabricated cathodes exhibit positive half-wave potential of 0.82 V for oxygen reduction and small overpotential of 350 mV at 10 mA cm −2 for oxygen evolution, respectively, which deliver smaller reversible oxygen electrode index (0.76 V) than the commercial Pt/C+RuO 2 (0.80 V) and most Co-based electrocatalysts ever reported. Impressively, the as-constructed liquid rechargeable ZAB behaves high peak power density (160 mW cm −2 ), large specific capacity (759.7 mAh g −1 at 10 mA cm −2 , tested after 120 h of OCV tests), and robust stability over 277 h. Moreover, the as-assembled quasi-solid-state ZAB using such freestanding cathode represents excellent mechanical flexibility and outstanding cycle performance, regardless of being serviced under extremely bending conditions from 0° to 180°, underscoring their promising applications as durable bifunctional cathode for portable metal–air batteries.
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高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2022
·Vol. 128
·期 2
·1-8
·
IF 2.983
Song Lixin,Qi Xueyang,Jing Wanru,Ke Huizhen,Chen Wei-Hsiang,Xiong Jie
The flexible nitrogen (N) doped TiO 2 /C nanofibrous film (NTC f ) was fabricated by a combination of electrospinning and annealing treatment. The BET surface area of the NTC f increases, reaches largest value, and then decreases slightly with increasing of N. And the NTC f -20 has a maximum BET surface area of 175.60 m 2 ·g −1 . These are beneficial to the absorption of dye by the photocatalyst. At the same time, the N doping could increase the light absorption of TiO 2 and is favorable to the charges transfer of the carbon nanofibers, resulting in improving the photocatalytic activity of NTC f under visible light. As a result, all the NTC f showed excellent photocatalytic performance. Moreover, with the increase of N concentration, the photocatalytic activity of the NTC f increased, reaching the largest value before decreasing. And the highest photocatalytic degradation efficiency of Rhodamine B (RhB) was about 99.1% for 1 h by using NTC f -20. After that, the NTC f film was stuck on organza fabric to form a photocatalytic fabric by hot pressing. And the photocatalytic fabric with degradation efficiency of 98.5% was easily separated from the dye solution and possessed excellent reusability. It has huge potential application in pollutant disposal in flowing water.
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高影响因子
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
·
2022
·Vol. 194
·期 11
·5167-5184
·
IF 3.094
An Peide,Zhu Fenfen,Liu Shiji,Zhou Xiaolin,Wang Chunfang,Liu Yufeng,Meng Hao,Zhang Xia
Recently, metal–organic frameworks (MOFs) are considered to be the moderate hosts for the bio-enzymes owing to their unique 3D pores and controllable surface affinity to the target molecules. In this work, the benzoic acid (BA)–modulated UiO-66-NO 2 was introduced, and cytochrome c (Cyt C) was chosen as the target enzyme to evaluate the immobilization efficiency of the resulting UiO-66-NO 2 -BA. The immobilization conditions including pH, adsorption time, and temperature and the initial concentrations of BA were optimized. The adsorption kinetics and thermodynamics were analyzed to further explore the enhanced adsorption mechanism. It is worth noted that all the UiO-66-NO 2 -BA exhibited evidently enhanced adsorption capacities in comparison with the unmodified UiO-66-NO 2 due to the formation of the chemical bonds between the UiO-66-NO 2 -BA and cytochrome C, indicating the positive roles of BA modification. Finally, the activities of the immobilized cytochrome C were assessed by using the catalytic oxidation of ABTS in the presence of H 2 O 2 , which reactions were also conducted over the free cytochrome C for comparison. The evidently improved stability under definite pH range, prolonged durability against the organic solvents, and the good reusability of the immobilized cytochrome C highlight the prospect applications of functional MOF immobilized enzymes in the practical catalytic reactions. Graphical abstract
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高影响因子
RSC Advances
·
2019
·Vol. 9
·期 53
·30628-30636
·
IF 3.049
Mingxue Wang,Xiaobing Huang,Haiyan Wang,Tao Zhou,Huasheng Xie,Yurong Ren
Na3V2(PO4)2F3 (NVPF) with NASCION (Na superionic conductor) is recognized as a potential cathode material owing to its high theoretical capacity. However, the electronic conductivity of NVPF is much lower than its ionic conductivity, which seriously affects the properties of this material. The carbon layer can be used as the conductive medium to enhance the conductivity of NVPF. In this study, we propose a single-step solid-state reaction method based on mechanical activation with pitch as the carbon source to synthesize NVPF/C composites. The crystallographic structure and morphology of all as-prepared samples were investigated by XRD, Raman spectroscopy, BET measurement, thermal analysis, SEM and TEM. Furthermore, the electrochemical performance and kinetic properties were analyzed by CV, galvanostatic charge–discharge and EIS tests. These tests outcomes demonstrated that the NVPF/C-2 composite with a carbon content of 12.14 wt% showed an excellent rate performance and cycle stability. It presented reversible capacities of 103 and 95 mA h g−1 at 0.2 and 10C, respectively, and an outstanding retention of 91.9% after 500 cycles at 5C. These excellent properties of the NVPF/C-2 composite are attributed to its high ion diffusion coefficient and small charge transfer impedance.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Long Liu,Xinxi Li,Gen He,Guoqing Zhang,Guanji Su,Chenhui Fang
Silicon-based materials have been widely used as anode materials in lithium-ion batteries (LIBs) because of the high specific capacity. However, there exist some shortcomings, especially in the thermal stability of the batteries, as well as huge volume expansion (＞300%) causes structural cracking. Herein, a core-shell structured SiO@C/TiO 2 nanospheres has been successfully synthesized via ball milling and sol-gel method, the morphological, componential and thermal features are characterized with X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy. The results exhibit that the SiO could spontaneously absorb the huge volume expansion stress, the C/TiO 2 shell as a compact fence was utilized to effectively enhance the electrical conductivity and further control the integrity and stability of well-wrapped core-shell framework during the charge/discharge processes. The electrochemical analysis show the SiO@C/TiO 2 nanospheres possess a remarkably high initial coulomb efficiency of 97%. The reversible capacity can reach to 1565 mA h g −1 at 0.1 A g −1 after 100 cycles, which is higher than those of N–SiO (1353 mA h g −1 ) and SiO@C (1326 mA h g −1 ). Even at 2 A g −1 , it exhibit a discharge capacity of 844.6 mA h g −1 after 220 cycles. This excellent performance can be primarily attributable to the well-designed core-shell structure of SiO@C/TiO 2 nanospheres, where the outer rigid C/TiO 2 coating can not only effectively alleviate the large volume change of SiO but also maintain the stable structure of anode materials, which are considered as a promising candidate to the anode material for new generation power LIBs.
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高影响因子
危险品化学品经营许可证（带存储）