International Journal of Electrochemical Science
·
2023
·
IF 1.5
Lei Xu,Feng Guo,Yong You,Jie Hu,Yanni Miao,Zixue Wu,Li Wang
A simple electrochemical sensor for the determination of sulfites in rice wine samples based on carbon black paste electrode (CBE) coupled with first-order derivative square wave voltammetry (SWV) was developed. CBE prepared by packing the mixture of carbon black powder and liquid paraffin oil with a ratio of 2:1 (w/w) into a cavity without any additional modification was reported. The cyclic voltammetry and SWV showed that the oxidation current of sulfite at CBE increased significantly compared with bare glassy carbon electrode or graphite paste electrode. Through first-order derivative processing, peaks became narrower and sharper leading to the enhancement of sensitivity. External standard calibration curve was in the range of 0.008~1.0 mmol L -1 with a detection limit of 6.0 μmol L -1 . This method was applied to the determination of sulfites in the commercial available rice wine samples and the results were compared with a titration method.
研究领域:
分析化学
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电化学
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食品分析
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生物传感
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分子检测
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Jing Tang,Xiaoqing Ma,Jing Liu,Shengbiao Zheng,Jianfei Wang
In this study, an electrochemical sensor for the simultaneous detection of hydroquinone (HQ) and catechol (CC) was fabricated on glassy carbon electrode (GCE) modified with graphene quantum dots (GQDs). The prepared GQDs were characterized by transmission electron microscope and fourier transform infrared spectroscopy. The GQDs/GCE, which prepared by electrodeposition method, and characterized by electrochemical impedance spectra, exhibited excellent electrochemical catalysis and conductive properties for HQ and CC. Owing to the high electroactive surface area, good electrocatalytic activity and low charge transfer resistance of GQDs, HQ and CC can be easily measured simultaneously for the large separation of oxidation peak potentials (113 mV) and do not interfere with each other. Under the optimal experimental condition, the oxidation peak currents were linear to HQ/CC in the range from 0.5 μM to 100 μM with the same low detection limits of 0.08 μM (S/N=3). Simultaneous determination of HQ and CC with such electrode was conducted in river water samples with reliable recovery between 97.90% and 103.9%.
研究领域:
分析化学
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电化学
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环境监测
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传感技术
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水污染检测
✓ 已验证
DOI
高影响因子
Small
·
2017
·Vol. 13
·期 32
·1701246
·
IF 8.643
Chunli Wang,Lianshan Sun,Feifei Zhang,Xuxu Wang,Qujiang Sun,Yong Cheng,Limin Wang
Highly uniform hierarchical Mo–polydopamine hollow spheres are synthesized for the first time through a liquid-phase reaction under ambient temperature. A self-assembly mechanism of the hollow structure of Mo–polydopamine precursor is discussed in detail, and a determined theory is proposed in a water-in-oil system. Via different annealing process, these precursors can be converted into hierarchical hollow MoO 2 /C and Mo 2 C/C composites without any distortion in shape. Owing to the well-organized structure and nanosize particle embedding, the as-prepared hollow spheres exhibit appealing performance both as the anode material for lithium-ion batteries and as the catalyst for hydrogen evolution reaction (HER). Accordingly, MoO 2 /C delivers a high reversible capacity of 940 mAh g −1 at 0.1 A g −1 and 775 mAh g −1 at 1 A g −1 with good rate capability and long cycle performance. Moreover, Mo 2 C/C also exhibits an enhanced electrocatalytic performance with a low overpotential for HER in both acidic and alkaline conditions, as well as remarkable stability.
研究领域:
材料科学
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电化学
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纳米材料
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能源存储
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催化化学
✓ 已验证
DOI
高影响因子
ChemSusChem
·
2018
·Vol. 11
·期 16
·2766-2775
·
IF 7.411
Yunpeng Liu,Yuhang Li,Siyuan Yang,Yuan Lin,Jiangliang Zuo,Hong Liang,Feng Peng
Reduction is considered to be an effective method to improve the photocatalytic activity of TiO 2 ; however, the underlying relationship between structure and photocatalytic performance has not been adequately unveiled to date. To obtain insights into the effect of structure on photocatalytic activity, two types of reduced TiO 2 were prepared from CO (CO-TiO 2 ) and H 2 (H-TiO 2 ). For H-TiO 2 , Ti−H bonds and oxygen vacancies are formed on the surface of H-TiO 2 , which results in a more disordered surface lattice. However, for CO-TiO 2 , more Ti−OH bonds are formed on the surface and more bulk oxygen vacancies are introduced; the disorder layer of CO-TiO 2 is relatively thin, owing to most surface vacancies being filled by Ti−OH bonds. Under simulated solar irradiation, the photocatalytic H 2 evolution rate of CO-TiO 2 reaches 7.17 mmol g −1 h −1 , which is 4.14 and 1.50 times those of TiO 2 and H-TiO 2 , respectively. The photocatalytic degradation rate constant of methyl orange on CO-TiO 2 is 2.45 and 6.39 times those on H-TiO 2 and TiO 2 . The superior photocatalytic activity of CO-TiO 2 is attributed to the effective separation and transfer of photogenerated electron–hole pairs, due to the synergistic effects of oxygen vacancies and surface Ti−OH bonds. This study reveals the relationship between the photocatalytic properties and structure, and provides a new method to prepare highly active TiO 2 for H 2 production and environmental treatment. Graphical Turn up the gas ! To obtain insights into the effect of structure on photocatalytic activity, two types of reduced TiO 2 are prepared from CO (CO-TiO 2 ) and H 2 (H-TiO 2 ). CO-TiO 2 exhibits a higher photocatalytic activity than that of H-TiO 2 due to the synergistic effects of oxygen vacancies and surface Ti−OH bonds.
研究领域:
材料科学
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光催化
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无机化学
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能源材料
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环境治理
✓ 已验证
DOI
高影响因子
Advanced Materials Interfaces
·
2019
·Vol. 7
·期 2
·1901703
·
IF 4.713
Weicai Zhang,Jing Peng,Mingtao Zheng,Hanwu Dong,Hang Hu,Yong Xiao,Yingliang Liu,Yeru Liang
Assembling of well-orientated mesopores and 0D substance into an orchestrate architecture for constructing advanced carbon-based composites is highly attractive. Currently, this nanofabrication method is facing challenges, because of the difficulty in the co-assembly of the building blocks is very hard to perform onto a high-curvature and heterogeneous 0D substrate. Here, an efficient active nanointerface-assisted co-assembly approach for design and fabrication of a novel class of yolk–shell Au@ordered mesoporous carbon nanosphere is reported. The key point to this preparation strategy is construction of reactive aldehyde functional groups on the surface of Au@SiO 2 nanospheres, which can react with the carbon source to in situ form a stable covalent bond at their nanointerface. The as-synthesized yolk–shell Au@ordered mesoporous carbon nanosphere not only exhibits uniform spherical morphology and robust porosity but also possesses a totally new ordered mesoporous and fast permeable shell structure, providing a chance for greatly broadening their application scope.
研究领域:
材料科学
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纳米医学
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生物材料
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药物递送
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肿瘤治疗
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Yan He,Xinmiao Fu,Han Wu,Tianxiao Zhu,Shenghui Li,Bing Na,Changjun Peng
Developing magnetic adsorbents with high adsorption capacity and rapid adsorption rate is one of the greatest challenges for the removal of methyl blue (MB) from aqueous media. In this work, a novel nitrogen-doped porous magnetic carbon (denoted as N-PMC) was designed and synthesized by one-step pyrolysis method. The obtained novel porous carbon N-PMC was found highly effective in removing MB from aqueous solution. The MB adsorption rate (k 2 = 1.34 mg g –1 min –1 ) of N-PMC is rapid, which is 15–20 times greater than those of activated carbon. The maximum adsorption capacity of N-PMC at room temperature calculated from the Langmuir model was 1,053.5 mg g –1 , one of the highest values among the currently reported magenetic adsorbents. Both experimental results and the DFT calculations illustrated that the electrostatic interaction between the N heteroatoms of the N-PMC and MB, which was responsible for efficient adsorption. Furthermore, the N-PMC could be easily isolated by magnetic force and recycled at least five times without significant loss in adsorption capacity. Therefore, the convenient synthetic route, the high adsorption capacity, the rapid adsorption rate and fast separation process make the porous carbon an attractive adsorbent for removing organic dyes from aqueous solution.
研究领域:
环境科学
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材料科学
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化学工程
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纳米技术
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污染控制
✓ 已验证
DOI
高影响因子
ChemElectroChem
·
2018
·Vol. 5
·期 23
·3708-3716
·
IF 4.446
Nanxiang Feng,Kaixiong Xiang,Li Xiao,Wenhao Chen,Yirong Zhu,Han Chen
Li 1.1 V 0.9 O 2 /C microspheres with isomeric core-shell structure were synthesized by a rapid cooling and subsequent evaporative assembly approach. The prepared Li 1.1 V 0.9 O 2 /C microspheres were characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) including elemental mapping analysis, and transmission electron microscopy (TEM). The core-shell Li 1.1 V 0.9 O 2 /C microspheres display identical composition but distinct texture of cores and shells, which herein is described as isomeric structure. Amorphous carbon nanodots are uniformly dispersed in the crystalline Li 1.1 V 0.9 O 2 matrix in the core. In the shell however, Li 1.1 V 0.9 O 2 nanoparticles are embedded in an amorphous carbon network. The Li 1.1 V 0.9 O 2 /C microspheres are tested as active material for anodes in lithium-ion batteries, and exhibit an excellent reversible capacity of 295 mAh g −1 , high capacity retention of 98 % after 100 cycles at 0.2 C and 95 % after 500 cycles at 2 C rate, and deliver wonderful rate capability of 250 mAh g −1 at 5 C. Thus, the Li 1.1 V 0.9 O 2 /C microspheres with isomeric core-shell structure are promising candidates as anode material for commercial lithium-ion batteries. Graphical In a nutshell : Li 1.1 V 0.9 O 2 /C microspheres are synthesized as anode material for lithium-ion batteries. The Li 1.1 V 0.9 O 2 /C microspheres display identical composition but distinct texture of cores and shells, which herein is described as isomeric structure. As anodes in lithium-ion batteries, the microspheres exhibit excellent overall electrochemical performance, rendering this material as promising candidate for the use in commercial lithium-ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
ChemElectroChem
·
2019
·Vol. 6
·期 14
·3648-3656
·
IF 3.975
Ruowei Yi,Xiangfei Lin,Yinchao Zhao,Chenguang Liu,Yinqing Li,Laurence J. Hardwick,Li Yang,Cezhou Zhao,Xianwei Geng,Qian Zhang
A light-weight dual-functional modified separator for lithium–sulfur batteries is prepared through a physical blend and blade-coating approach. The separator is coated with carbon black/poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) (CB/PEDOT:PSS), remarkably improving the utilization of sulfur by serving as the co-current collector. Moreover, the PEDOT:PSS effectively inhibits the diffusion of polysulfides and promotes the migration of lithium ions by providing chemical absorption and cation transport acceleration. When assembling this modified separator into the coin cell, an initial specific capacity of 1315 mAh g −1 at 0.2 C is achieved with a capacity of 956 mAh g −1 after 100 cycles, showing a superior performance compared to the cell without an interlayer. Meanwhile, the cell exhibits a rate capability with a discharge capacity of 699 mAh g −1 at a current density of 2 C. Notably, the areal density of CB/PEDOT:PSS coating is as low as 0.604 mg cm −2 , bringing a specific electrode capacity of 522 mAh g −1 at 1 C. Graphical Layer up : A dual-functional carbon black/poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) (CB/PEDOT:PSS) modified separator is fabricated. By providing effective polysulfide absorption and better current transportation, this light-weight coating brings a capacity of 956 mAh g −1 after 100 cycles at 0.2 C and a 522 mAh g −1 total cathode mass capacity at 1 C
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
高分子科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Shuo Wang,Yanyan Li,Fanteng Ma,Xiaozhong Wu,Pengfei Zhou,Zhichao Miao,Peibo Gao,Shuping Zhuo,Jin Zhou
Potassium ion batteries (PIBs) have received widespread attention nearly four years due to sufficient potassium resources and similar chemical properties of potassium to lithium. Several works reported that N-doping on the carbon electrodes could efficiently improve the storage capacity of potassium ions. Herein, we synthesized two series of carbon spheres with the main difference is with or without N-doping. It is found that the storage of potassium ions is mainly determined by the crystal structure instead of N-doping. N-doping seems to affect the ion diffusion process, but the total capacity is still determined by the (0 0 2) lateral size of the carbon materials ( L a ). The specific capacity increases as L a increases. The N-doped carbon sphere with larger L a of 8.32 nm, delivers a higher reversible capacity of 241 mAh g −1 at a current density of 25 mA g −1 . And it still remains 121 mAh g −1 after 100 cycles at a current density of 100 mA g −1 .
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
碳材料
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Qin Li,Han Zhang,Shuaifeng Lou,Yunteng Qu,Pengjian Zuo,Yulin Ma,Xinqun Cheng,Chunyu Du,Yunzhi Gao,Geping Yin
Metallic oxide ZnO is considered to be a promising alternative anode material for lithium ion battery because of its high theoretical capacities (978 mA h g −1 ). However, its inherent low electronic conductivity and undesirable large volume change result in inferior electrochemical performances and hinder its practical application. Herein, ZnO/ZnO@C composites are prepared by a simple carbonization process of ZnO/ZnO@ZIFs-8, which are constructed by using ZnO particles as both template and zinc sources for zeolitic imidazolate frameworks-8 (ZIF-8) preparation via a facile solution reaction. When evaluated as anode for lithium ion batteries, the as-prepared composites show an initial capacity of 878 mA h g −1 at current density of 0.1 A g −1 with high capacity retention of 95.6% after 50 cycles, and an initial capacity of 359 mA h g −1 tested at 5.0 A g −1 with a capacity retention of 85.3% after 500 cycles, exhibiting outstanding cycling stability and excellent rate capability. The ameliorated electrochemical performances are mainly attributed to the elevated conductivity and cushioning effects provided by carbon framework derived from ZIF-8, and the enhanced pseudocapacitance behavior originated from the decreased size of ZnO particles and high surface area of ZIFs-derived carbon.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
锂离子电池
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Qiuping Zhou,Dawei Wang,Lubin Ni,Huaihao Zhang,Jing Zhao
Recently, aluminum-based batteries have received extensive attention from researchers because of their advantages over other metals-based batteries in terms of cost, energy density , and safety performance. Herein, we synthesized willow leaf-shape ReSe 2 @C as the positive electrode of aluminum batteries. ReSe 2 , with anisotropic crystal structure, is encapsulated in carbon using weak interlaminar van der Waals force. Its low lattice symmetry increases the ion/electron adsorption sites and reduces the energy barrier for ion intercalation into ReSe 2 layers. The electrochemical analysis and X-ray photoelectron spectroscopy of ReSe 2 @C have ascertained that AlCl 4 - is intercalated/embedded in host material during charging/discharging. The specific discharge capacity of ReSe 2 @C remains 88 mA h g −1 after 1000 cycles at the current density of 100 mA g −1 , with a high Coulomb efficiency of 98%.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
无机化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 54
·30794-30801
·
IF 2.936
He Wang,Yan Song,Yanwei Li,Mengwei Wang,Qianli Ma,Wensheng Yu,Dan Li,Xiangting Dong,Jinxian Wang,Guixia Liu
To achieve a high power density of lithium-ion batteries, it is essential to develop anode materials with high capacity and excellent stability. Cobalt oxide (Co3O4) is a prospective anode material on account of its high energy density. However, the poor electrical conductivity and volumetric changes of the active material induce a dramatic decrease in capacity during cycling. Herein, a hierarchical porous hybrid nanofiber of ZIF-derived Co3O4 and continuous carbon nanofibers (CNFs) is rationally constructed and utilized as an anode material for lithium-ion batteries. The PAN/ZIF-67 heterostructure composite nanofibers were first synthesized using electrospinning technology followed by the in situ growth method, and then the CNFs/Co3O4 nanofibers were obtained by subsequent multi-step thermal treatment. The continuous porous conductive carbon backbone not only effectively provides a channel to expedite lithium ion diffusion and electrode transfer, but also accommodates volume change of Co3O4 during the charge–discharge cycling process. The electrode exhibits a high discharge capacity of 1352 mA h g−1 after 500 cycles at a constant current density of 0.2 A g−1. Additionally, the composites deliver a discharge capacity of 661 mA h g−1 with a small capacity decay of 0.078% per cycle at a high current density of 2 A g−1 after 500 cycles. This hierarchical porous structural design presents an effective strategy to develop a hybrid nanofiber for improving lithium ion storage.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
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）