Polymers
·
2015
·Vol. 7
·期 10
·1939-1953
·
IF 3.681
Zhongkai Hu,Lei Zu,Yanhua Jiang,Huiqin Lian,Yang Liu,Zhenzi Li,Fei Chen,Xiaodong Wang,Xiuguo Cui
The PANI/Mesoporous MnO2composites were prepared through a simple one step method and we introduced the KI-H2SO4solution as the electrolyte of PANI/MnO2composites creatively. The characterization of structure, morphology, and composition are obtained by X-ray diffraction, Fourier transform infrared spectroscopy, thermal gravity analysis, Raman spectra, and scanning electron microscope. The electrochemical performances were investigated by constant-current charge–discharge, the voltammetry curve, and alternating current (AC) impedance technique. The specific capacitance of composites is 1405 F/g, which is almost 10 times larger than MnO2(158 F/g). We also find that the iodide concentration is closely related to the specific capacitance. Therefore, we explored the specific capacitance at different iodide concentration (0.05, 0.1, 0.2, 0.5, and 1 M), the results indicated that the specific capacitance reached a maximum value (1580 F/g) at 0.5 mol/L. Additionally, the PANI/Mesoporous MnO2composites not only exhibited a good ratio discharge property (857 F/g) at high current density, but also revealed an excellent cycling stability after 500 cycles, which retained 90% of the original specific capacitance.Keywords:polyaniline;mesoporous MnO2;specific capacitance;KI
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 ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Xinping Yang,Wei Feng,Xinyi Wang,Jinglin Mu,Chao Liu,Xiaozhong Wu,Pengfei Zhou,Jin Zhou,Shuping Zhuo
To investigate the effect of structural properties of fluorinated graphene (FG) on the supercapacitive properties in KI additive electrolyte , the porous structure and surface F element content of FG were adjusted via chemical reduction by hydrazine and heating treatment. Systematically electrochemical measurements show that there is a dramatical increase of specific capacitance (583 F/g) in KI-additive electrolyte due to the pseudocapacitance brought by KI compared with that (17 F/g) in pure H 2 SO 4 electrolyte. Investigation on the relationship between F content and areal capacitance show that small amount of F content, especially for semi-ionic C-F species with better electronic conductivity compared with covalent C-F species, can effectively promote the areal capacitance. With moderate F content and relatively high specific surface area, the assembled symmetric supercapacitor can deliver an energy density of 8.89 Wh kg −1 and exhibits a long cyclic stability.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Xiaozhong Wu,Xinping Yang,Bingtong Wang,Jinglin Mu,Xiangyan Shen,Pengfei Zhou,Jin Zhou,Shuping Zhuo
A series of porous carbons (PCs) with tunable surface areas were prepared by molten salt (NaCl/KCl) method with the assistance of CaCO 3 . Gas sorption analyses by N 2 and CO 2 show that the usage of CaCO 3 leads to the increasement of in micropores and mesopores, thus enlarging the surface area up to 864 from 425 m 2 g −1 . Besides, numerous micropores (<0.6 nm) inaccessible to N 2 can be detected by CO 2 . Supercapacitive performance for PCs was also investigated in aqueous KOH, H 2 SO 4 and KI-additive (H 2 SO 4 + KI) electrolytes as well. Combining the results of pore-structure analysis, the investigations on the relationship between specific capacitance and pore-size show that the minimum pore entrance for SO 4 2− , K + and I − are 0.4, 0.32 and 0.4 nm, respectively. Considering the naked/solvated ionic sizes of SO 4 2− (0.38/0.58 nm), K + (0.26/0.42 nm) and I − (0.39/0.66 nm), desolvation effect probably occurs in those aqueous electrolytes. Moreover, the effect of oxygen functionalities on the redox reaction was also investigated in this work. It is found that the quinone oxygen species is electrochemically active in both H 2 SO 4 and KI-additive electrolytes. With the addition of KI in electrolyte, the prepared porous carbon-based supercapacitor possesses high specific energy of 55.7 Wh kg −1 .
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Yuelong Liu,Jinyan Liu,Bo Chen,Xiaohui Ren
Corrosion of metals has significant implications for international livelihoods, and excessive pickling can lead to corrosion of Q235 steel during the production process, thus, this study investigates the corrosion inhibition performance of three betaine surfactants (SB3-n, 10, 12, 14) with different carbon chain lengths and KI compounds, on Q235 steel in 1 mol·L -1 hydrochloric acid through experimental and theoretical analyses. The results show that the optimal efficiency of SB3-n/KI can be above 90%. Corrosion inhibitors adsorb simultaneously on the metal surface, making the metal surface smooth and flat. Theoretical analysis shows that the adsorption ability of I - is higher than that of Cl - , and all three compound inhibitors adsorb on the metal surface chemically, with the adsorption energy in the order of SB3-14
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITE INTERFACES
·
2016
·
IF 1.046
You Zhang,Zhongkai Hu,Yanhua Jiang,Lei Zu,Huiqin Lian,Yang Liu,Xiuguo Cui
High performance electrodes for supercapacitor usually are achieved by compositing conductive and redox materials, the former such as multi-walled carbon nanotubes (MWCNTs), graphene, etc., provide the electrical double-layer capacitances that far less than pseudo-capacitances of the later (metal oxide, polyaniline, and so on). Here, carbonaceous composite electrode of MWCNTs and the redox electrolyte are combined into an electrochemical system for high synergetic effect of capacitance. MWCNT is activated by acid treatment and its structures are characterized by scanning electron microscope, X-ray diffraction, and Infrared spectroscopy analyses. The electrochemical measurements of resultant electrodes showed an excellent synergetic effect. The acid-activated MWCNTs electrode exhibited the maximum specific capacitance of 682 F/g in 0.2 M KI redox electrolytes, which is about 2–20 times larger than MWCNTs and its composite electrode in universal electrolyte without KI.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Jinbin Lin,Junyang Xiao,Hengyu Cai,Yixin Huang,Jiawen Li,Haoyu Yang,Tao Li,Jing Zou
In this study, a multi-wavelength spectrophotometric method for simultaneous determination of peracetic acid (PAA) and coexistent hydrogen peroxide (H 2 O 2 ) was presented. This method was based on the oxidation of 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonate) (ABTS) with the assistance of Fe 2+ /KI to produce a stable green radical (ABTS ●+ ), which could be determined at four characteristic peaks (i.e., 415 nm, 650 nm, 732 nm, and 820 nm). The absorbances of ABTS ●+ at four peaks were well linear (R 2 > 0.999) with concentrations of both total peroxides (PAA + H 2 O 2 ) and PAA in the range of 0–40 μM under optimized conditions. The sensitivities for determining total peroxides at 415 nm, 650 nm, 732 nm and 820 nm were determined to be 4.248 × 10 4 M −1 cm −1 , 1.682 × 10 4 M −1 cm −1 , 2.132 × 10 4 M −1 cm −1 , and 1.928 × 10 4 M −1 cm −1 , respectively. For determining PAA, the corresponding sensitivities were 4.622 × 10 4 M −1 cm −1 , 1.895 × 10 4 M −1 cm −1 , 2.394 × 10 4 M −1 cm −1 and 2.153 × 10 4 M −1 cm −1 , respectively. The concentration of coexistent H 2 O 2 was gained by deducting PAA concentration from total peroxides concentration. The ABTS method was accurate enough to determine PAA concentration in natural water samples. Moreover, the ABTS method was successfully used to determine the changes of PAA and coexistent H 2 O 2 and to distinguish their role on naproxen degradation in heat-activated PAA process. Overall, the ABTS method could be used as an alternative method for the convenient, rapid and sensitive determination of PAA and the coexistent H 2 O 2 in water samples.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Oncology Letters
·
2017
·Vol. 15
·期 2
·2471-2476
·
IF 1.39
Guang Sun,Wanying Xing,Ren Xing,Liu Cong,Sun Tong,Siyao Yu
The aim of the present study was to develop a water-soluble biomarker for the detection of breast cancer using quantum dots (QDs) conjugated to Ki‑67, a nuclear protein associated with the cell cycle. Ki‑67 is also a marker of cell proliferation, with expression levels categorizing good and poor prognosis in invasive breast cancer. Ki‑67 is a clinically used biomarker for breast cancer diagnosis, treatment and prognosis. Owing to the optical and chemical advantages of QDs, QD‑based nanotechnology may aid the construction of a biomedical imaging platform for the study of cancer cell behavior. In the present study, a biomarker was prepared by employing the water‑soluble CuInS2/ZnS QDs conjugated to an anti‑Ki‑67 monoclonal antibody to detect Ki‑67 expression in breast cancer. The QDs, which were hydrophobic and coated with octadecylamine, were encapsulated with an amphiphilic biocompatible centipede‑like polymer, and then conjugated to anti‑Ki‑67 monoclonal antibodies (QD‑Ki‑67 probes). The QD‑Ki‑67 probes retained the original optical properties of the unadorned QDs and did not exhibit distinct toxic side effects in in vitro cytotoxicity experiments. Therefore, this CuInS2/ZnS QD‑labeled bioprobe, with a high quantum yield and low cytotoxicity, is a promising candidate for bioimaging and may be used as a cell label.
研究领域:
肿瘤学
·
纳米技术
·
生物医学工程
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Dequan Huang,Cuihong Zeng,Menghao Liu,Xiaorong Chen,Yahao Li,Sijiang Hu,Qichang Pan,Fenghua Zheng,Qingyu Li,Hongqiang Wang
A lithium metal battery (LMBs) is an excellent battery system for advanced electrochemical energy storage. However, the growth of lithium dendrites, the accumulation of inactive lithium, and the side reactions between lithium metal and electrolytes limit the cycling stability of LMBs. Herein, we introduce KI additive into lithium bis(trifluoromethanesulfonyl)imide (LiTFSI)/ether-based electrolyte and lithium hexafluorophosphate (LiPF 6 )/ester-based electrolyte for cycling stability improvement of LMBs. Cu-mesh@Ag||Li half-cell with 0.01 M KI additive exhibits a Coulombic efficiency as high as 98.8 % over 200 cycles. The improved performance due to the electrostatic shielding effect formed by K + at low concentration and the rapid recovery of inactive lithium by iodine redox. The corresponding Li||Li symmetrical cell shows an outstanding lifespan of 1400 h at 1.0 mA cm −2 with 1.0 mAh cm −2 . Meanwhile, in the 1 M LiTFSI + 0.01 M KI electrolyte, the Cu-mesh@Ag-Li||LiFePO 4 (LFP) full cell holds capacity retention of 91.7 % over 800cycles at 2.0 C, the Li||LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) full cell possesses much better capacity retention of 54 % after 500 cycles at 1.0 C. This work offers a cost-effective proposal to improve application potential with the electrolyte engineering of rechargeable Li metal batteries.
研究领域:
电化学
·
材料科学
·
能量存储
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2016
·Vol. 6
·期 16
·6406-6416
·
IF 5.287
Mengshuai Liu,Kunqi Gao,Lin Liang,Jianmin Sun,Li Sheng,Masahiko Arai
The combination of a metal-modified SBA-15 catalyst with potassium iodide was developed as heterogeneous dual catalysts for chemical fixation of CO2 to cyclic carbonates. It was observed that the binary Zn-SBA-15/KI catalysts were the most efficient among various metal-modified SBA-15/KI catalysts and showed an excellent synergetic effect in promoting the reaction under mild conditions. Moreover, the effects of reaction parameters on cycloaddition of CO2 with propylene oxide (PO) to propylene carbonate (PC) were optimized. Under the optimal conditions determined, the Zn-SBA-15/KI catalytic system was also versatile in CO2 cycloaddition with other epoxides. Additionally, the mechanistic details for the fixation of CO2 into a cyclic carbonate catalyzed by SBA-15/KI and Zn-SBA-15/KI were also contrastively elucidated using the density functional theory (DFT) method. The DFT results suggested that the zinc-modified and unmodified catalysts showed different coupling modes of CO2, and the ring-opening reaction was the rate-determining step in the SBA-15/KI catalyzed cycloaddition reaction, but the zinc-modified SBA-15/KI catalysts could enhance the CO2 cycloaddition, as the formation of a stable complex was beneficial to CO2 trapping. As a result, the ring-closing reaction became the rate-determining step in the Zn-SBA-15/KI catalyzed cycloaddition reaction, which was a promising result to guide the catalyst design for CO2 conversion.
研究领域:
催化化学
·
环境科学
·
理论化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 21
·17311-17316
·
IF 3.201
Changjin Li,Zhengyi Qian,Yulin Ma,Pengjian Zuo,Chunyu Du,Hua Huo,Geping Yin
Non-aqueous rechargeable Li–O2 batteries have attracted great attention owing to their ultra-high specific energy densities. However, the high charge overpotential and the interfacial instability of lithium anodes still need to be overcome before the practical application of Li–O2 batteries. Here, we use KI as a bifunctional electrolyte additive for Li–O2 batteries. The results demonstrate that I− could act as a redox mediator to effectively reduce the charge overpotential by 0.7 V. On the other hand, the introduction of K+ contributes to decreasing the polarization, optimizing the morphology, reducing the surface by-products of the lithium anode and dramatically improving the uniform distribution of discharge products on the cathode surface. The dual functions of KI additive thus successfully boost the electrochemical performances of Li–O2 batteries.
研究领域:
电化学
·
能源材料
·
锂离子电池
·
界面化学
·
储能技术
✓ 已验证
DOI
高影响因子
Journal of CO2 Utilization
·
2018
·
IF 5.503
Haibo Chang,Qingshuo Li,Xuemin Cui,Hongxia Wang,Zhanwei Bu,Congzhen Qiao,Tong Lin
Chemical conversion of carbon dioxide (CO 2 ) into usable materials offer opportunities to use carbon dioxide as a sustainable carbon source, but remains difficult to make. In this study, wool powder (WP), fine particles produced from natural wool fibers, was used as a catalyst for cycloaddition coupling of CO 2 with propylene oxide (PO) to form propylene carbonate (PC) in a solvent free condition. Potassium halide (KCl, KBr and KI), tetrabutylammonium iodide (TBAI), 1, 8-diazabicyclo[5.4.0]-undec-7-ene (DBU), and N , N -dimethylaminopyridine (DMAP) were used separately as co-catalyst. A synergetic effect was found between WP and KI, which shows the optimal efficiency when a low amount of the catalyst (e.g. 1.0 mol% KI relative to PO, WP: KI = 2:1 wt/wt) was employed at 1.5 MPa and 120 °C. The catalyst can be repeatedly used for five cycles without apparently losing the activity. It could be used to catalyze coupling of other mono-substituted terminal epoxides with CO 2 . Wool powder-KI may serve as an efficient, green catalyst system for the fixation of CO 2 .
研究领域:
催化化学
·
绿色化学
·
二氧化碳利用
·
高分子化学
·
可持续材料
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 137
·期 21
·48723
·
IF 2.188
Fangji Gan,Yuyu Xu,Huimin Yang,Zhe Ren,Haiyan Du
Solid-state polymer supercapacitors (SSP-SCs) have vast potential for future development due to their compact, safe, environment-friendly, and facile designing. Thus, prevalent researches have been explored in this area. In this article, poly(3,4-ethylenedioxythiophene) (PEDOT) SSP-SCs were assembled by using poly(3,4-ethylenedioxythiophene)/carbon paper (PEDOT/CP) as electrodes and polyvinyl alcohol/sulfuric acid/potassium iodide (PVA/H 2 SO 4 /KI) as the gel polymer electrolyte. The effect of KI content on the electrochemical performance of the SC was studied by cyclic voltammetry, galvanostatic charge–discharge measurements (GCD), and electrochemical impedance spectroscopy. The results indicated that the PEDOT SSP-SC has excellent electrochemical properties when KI doping amount was 60 wt %. The introduction of KI increased the specific capacitance due to the improved ionic conductivity and additional pseudocapacitance reaction at the electrode–electrolyte interface. The PEDOT SSP-SC showed high energy and power densities of 451.32 Wh kg −1 and 13.29 kW kg −1 , respectively, as well as a specific capacitance of 352.59 F g −1 for a discharge current of 1 mA cm −2 . In addition, after 1000 GCD cycles, the PVA/H 2 SO 4 /KI-based PEDOT SSP-SC showed capacitance retention of 74.08%. Therefore, the SC exhibits outstanding energy and power density and good cycle stability and has great potential to be used in high-energy density equipment. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48723.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）