ACS Applied Nano Materials
·
2018
·
IF 0
Lu Shen,Yong Li,Wenjie Zhao,Lijing Miao,Weiping Xie,Huanming Lu,Kui Wang
In order to hold the excellent corrosion resistance of zinc-rich epoxy coatings with reduced zinc content, five types of graphene modified zinc-rich epoxy coatings (G-ZRCs) were prepared. The effect of zinc content on the corrosion protection behaviors of G-ZRCs was investigated using electrochemical impedance spectroscopy (EIS). Open circuit potential (OCP) was also utilized to deepen the understanding of the anticorrosion mechanism of the as-prepared composite coatings. The results confirmed that addition of 0.3 wt % graphene could make the coating with 40 wt % (G-40ZRC) and 55 wt % zinc (G-55ZRC) provide cathodic protection for a short period of time. The EIS and OCP results showed a dominant physical barrier protection mechanism for the coatings without zinc (G-ZRC), while there was a mixed mechanism for G-40ZRC and G-55ZRC and a dominant cathodic protection mechanism for the coatings with 70 and 85 wt % zinc (G-70ZRC and G-85ZRC). Furthermore, the graphene modified zinc-rich coatings and corresponding corrosion products immersed in a 3.5% NaCl solution for 100 days were also characterized, which could further reveal anticorrosion mechanisms of the graphene modified zinc-rich coatings and the passivation effect of polyaniline (PANI).
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
SOLID STATE IONICS
·
2014
·
IF 2.112
Jing Yang,Zhen Huang,Bingxin Huang,Jing Zhou,Xiaoxiong Xu
NASICON-type structure lithium ion conductors have been considered as promising solid electrolytes due to its very high Li + -ion conductivity and chemical stability. In this paper, NASICON-type structured Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 (LAGP) glass–ceramics are prepared from crystallization of glass powders, which are obtained by a simple melt-quench method. NH 4 H 2 PO 4 , H 3 PO 4 , P 2 O 5 and H 3 PO 4 &Al(PO 3 ) 3 are used as phosphorus sources, respectively. The obtained LAGP glass–ceramics are systematically characterized with X-ray diffraction, field emission scanning electron microscopy , differential scanning calorimetry and AC impedance spectroscopy . The different impurities are formed depending on the phosphorus sources, which further influence the microstructure. As a result, the lithium ion conductivity is significantly affected by the phosphorus sources. The highest conductivity of 5.21 × 10 − 4 S·cm − 1 is obtained when H 3 PO 4 is used as the phosphorus source under optimum conditions.
研究领域:
材料科学
·
固态离子学
·
无机非金属材料
·
能源材料
·
电化学
✓ 已验证
DOI
高影响因子
POWDER TECHNOLOGY
·
2018
·
IF 3.23
Hongjing Wu,Shaohua Qu,Kejun Lin,Yuchang Qing,Liuding Wang,Yuancheng Fan,Quanhong Fu,Fuli Zhang
It has been rarely reported that the microwave absorption materials can exhibit excellent low-frequency EM wave absorbing properties. In this paper, we synthesized steady short carbon fibers (SCFs)@TiO 2 composites by using simple one-pot hydrothermal process. The conductive short carbon fibers could be separated by TiO 2 nanoparticles from each other and reduced the conductivity of composite materials as a whole, meeting the requirements of impedance matching . With the introduction of SCFs content, SCFs@TiO 2 composites showed improved tan δ E values at low frequencies, implying the enhanced microwave attenuation ability at low and medium frequency. We unexpectedly found that the SCFs@TiO 2 composites exhibited very strong absorbing peaks ( i.e. , −46.3 dB) at low frequencies with relatively thin matching thickness. Interestingly, when the thickness of the SCFs@TiO 2 composite was only 1.0 mm, the absorbing bandwidth with a RL value less than −10 dB was over 14.3–16.7 GHz ( i.e. , absorbing frequency bandwidth is 2.4 GHz).
研究领域:
材料科学
·
电磁功能材料
·
纳米复合材料
·
微波吸收材料
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2016
·Vol. 26
·期 3
·481-487
·
IF 2.322
Zhen Zhang,Pengfei Zhou,Huanju Meng,Chengcheng Chen,Fangyi Cheng,Zhanliang Tao,Jun Chen
LiNi 0.915 Co 0.075 Al 0.01 O 2 (NCA) with Zr(OH) 4 coating is demonstrated as high performance cathode material for lithium ion batteries (LIBs). The coated materials are synthesized via a simple dry coating method of NCA with Zr(OH) 4 powders, and then characterized with scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). Experimental results show that amorphous Zr(OH) 4 powders have been successfully coated on the surface of spherical NCA particles, exhibiting improved electrochemical performance . 0.50 wt% Zr(OH) 4 coated NCA delivers a capacity of 197.6 mAh/g at the first cycle and 154.3 mAh/g after 100 cycles with a capacity retention of 78.1% at 1 C rate. In comparison, the pure NCA shows a capacity of 194.6 mAh/g at the first cycle and 142.5 mAh/g after 100 cycles with a capacity retention of 73.2% at 1 C rate. Electrochemical impedance spectroscopy (EIS) results show that the coated material exhibits a lower resistance, indicating that the coating layer can efficiently suppress transition metals dissolution and decrease the side reactions at the surface between the electrode and electrolyte. Therefore, surface coating with amorphous Zr(OH) 4 is a simple and useful method to enhance the electrochemical performance of NCA-based materials for the cathode of LIBs.
研究领域:
电化学
·
材料科学
·
能源存储
·
电池技术
·
无机非金属材料
·
固态化学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Xingliang Chen,Yan Wang,Hailing Liu,Shu Jin,Guanglei Wu
The applications of cobalt ferrite and nickel ferrite composite materials on electromagnetic (EM) wave absorption are the research hotspot currently. However, the systematical comparison study between these two ferrites composites have rarely been carried out. Thus, the EM wave absorption performance of interconnected carbon@Ni x Co 1-x Fe 2 O 4 composites with core–shell structures were investigated comprehensively in this work. A series of magnetic nanospheres including NiFe 2 O 4 , cobalt-doped nickel ferrite, nickel–cobalt ferrite, nickel-doped cobalt ferrite and CoFe 2 O 4 were synthesized firstly, and then uniformly encapsulation by carbon rendered the corresponding C@Ni x Co 1-x Fe 2 O 4 composites nanospheres. Synthesis reactions involved for C@Ni x Co 1-x Fe 2 O 4 formation were investigated in detail, and afterwards their magnetic behavior, EM wave absorption performance and absorbing mechanism were thoroughly explored and analyzed. Results show that when nickel is dominant element and cobalt is doping element (Ni 0.75 Co 0.25 Fe 2 O 4 ), the composite nanosphere exhibits optimum EM wave absorption performance. When the sample thickness is just 1.9 mm, its RL min value can reach −51 dB, and the corresponding EAB width is 3.3 GHz. The synthesized C@Ni 0.75 Co 0.25 Fe 2 O 4 can be qualified as an efficient and thin electromagnetic wave absorber, which is mainly attributed to its special structure, fair electromagnetic matching and impedance matching.
研究领域:
材料科学
·
电磁学
·
纳米材料
·
功能材料
·
复合材料工程
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·Vol. 11
·期 12
·10135-10149
·
IF 1.5
Lijuan Gong,Kangquan Qiao
The corrosion inhibition performances of Diantipyrylmethane (DAM) for mild steel in 0.5 M H 2 SO 4 were investigated using weight loss, electrochemical impedance spectroscopy (EIS), potentiodynamic polarization, scanning electron microscope (SEM) and quantum chemical calculation. The obtained results reveal that DAM acts as a mixed-type inhibitor with a predominantly anodic reaction, and the inhibition efficiency increases with increasing inhibitor concentration whereas decreases with increasing temperature. The adsorption of DAM on steel surface is found to obey Langmuir isotherm, and the adsorption mechanism is mixed physical and chemical adsorption. The results of quantum chemical calculation demonstrate that pyrazolone rings within molecular structure of DAM play a dominant role in corrosion inhibition of mild steel.
研究领域:
材料腐蚀与防护
·
物理化学
·
电化学
·
表面科学
·
量子化学
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·Vol. 11
·期 8
·7066-7075
·
IF 1.5
Jiheng Ding,Hongran Zhao,Lin Gu,Shengpei Su,Haibin Yu
This paper reports the synthesis of waterborne epoxy phosphate emulsion (WEP) through the reaction between epoxy resin E44 and phosphoric acid and ammonia neutralization. Synthesized WEP was characterized by FTIR for the confirmation of reaction between epoxy groups and phosphoric acid and SEM for morphology. WEP acted as a modifier in two-component epoxy anticorrosion coating on rusty steel substrate. The anticorrosion properties of the coating on rusty steel were investigated by electrochemical impedance spectroscopy (EIS) and Tafel polarization curve. Tafel polarization curve revealed that waterborne epoxy coating containing WEP had better protection ability which is clearly reflected by the protection efficiency (96.6%). EIS study also showed the higher impedance value for WEP containing coating as compared to pure waterborne epoxy coating.
研究领域:
材料科学
·
腐蚀与防护
·
高分子化学
·
表面工程
·
电化学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2021
·
IF 2.495
Xia Zhang,Qiumin Cao,Zhuohuan Guo,Meiyue Zhang,Meng Zhou,Zhenzhen Zhai,Yuandong Xu
MoS 2 nanosheet arrays grown on functional pomelo peel derived carbon (PPC) is constructed via in situ self-assembly method. The obtained MoS 2 /PPC composite is further used to fabricate electrochemical sensor for taxifolin detection. The current response of taxifolin on MoS 2 /PPC is significantly enhanced due to the synergistic effect between MoS 2 and PPC. It is found that the charge transfer impedance and the Ohmic resistance corresponding to MoS 2 /PPC are the lowest, indicating fast electron transfer rate and good conductivity. Further investigation reveals that the redox peak current is linearly related to the concentration of taxifolin in the range of 7 × 10 −8 –1 × 10 −5 mol·L −1 and the limit of detection is calculated to be 2.3 × 10 −8 mol·L −1 (S/N = 3). In addition, no obvious interfering phenomenonhas been observed in the detection process of taxifolin, demonstrating that MoS 2 /PPC presents good selectivity toward taxifolin determination.
研究领域:
材料科学
·
电化学
·
分析化学
·
纳米技术
·
生物传感器
·
环境监测
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·Vol. 13
·期 2
·1985-2000
·
IF 1.5
Zhe Zhang,Le Ruan,Weipeng Zhang,Yuzeng Lyu,Wei Shang,Yuqing Wen,Xiuying Li,Ling Wu,Yanni Jiao
The triazol-3-ylamine and three different kinds of Schiff base compounds are self-assembled on bronze surface. Electrochemical impedance spectroscopy and potentiodynamic polarization measurements show that the triazol-3-ylamine and Schiff base self-assembled films can protect bronze from corrosion in 0.5 M HCl solution. The corrosion efficiency increases with the self-assembly time increasing and reaches a stable value after 8 h. The highest corrosion efficiency of the bronze electrode modified with self-assembled films reaches 95.81% after immersing in 0.005 M 2,4-Dibromo-6-[(4H-[1,2,4]Triazol-3-ylimino)-methyl]-phenol Schiff base solution for 10 h. X-ray photoelectron spectroscopy and scanning electrochemical microscope are used to characterize the inhibitive ability of the self-assembled films. Quantum chemical calculations and dynamic simulations indicate that the triazol-3-ylamine and Schiff bases molecules can absorb on the copper surface via chemisorption. The adsorption energy increases with the number of aromatic rings.
研究领域:
材料腐蚀与防护
·
物理化学
·
表面科学
·
电化学
·
计算化学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Yueying Gao,Weiwei Meng,Ling Wang,Yuehua Li,Lei Dai
Salt melt synthesis is a kind of inorganic material synthesis method developed in modern times, which has certain potential advantages and development prospects. The sensing electrode (SE) material In 2 O 3 was synthesized by the salt melt method. The composition and morphology of the synthesized products under different conditions were studied in detail by combining XRD , SEM and TEM characterization. The results show that the salt melt method can facilely synthesize high-purity In 2 O 3 powder at a lower temperature, and its morphology changes regularly with the change of reaction conditions. The effects of synthesis times and temperatures on the gas-sensing performance of In 2 O 3 were discussed. The sensor based on In 2 O 3 (380 °C − 30 min)-SE exhibited superior gas-sensing performance in the range of NH 3 concentration of 50–500 ppm. The NH 3 response characteristics exhibited little effect at different relative humidity (RH) and oxygen partial pressure conditions. In addition, the sensor exhibited good repeatability and selectivity .
研究领域:
材料科学
·
传感器技术
·
无机合成
·
气体传感
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 4
·2887-2894
·
IF 2.22
Liu Yuan,Gu Yi-Jing,Deng Jia-Li,Luo Gui-Yang,Wu Fu-Zhong,Mai Yi,Dai Xin-Yi,Li Jun-Qi
A series of LiFe 1− x Mn x PO 4 /C composites were successfully synthesized through a simple hydrothermal method. The effects of doped Mn on their micro-structures and electrochemical performances were investigated. The XRD results indicate that Mn doping cannot change the olivine lattice type of LiFePO 4 . Appropriate Mn doping can reduce the particle size of LiFePO 4 . The electrochemical performance data show that the electrochemical performances of the composite materials are enhanced at first and then decrease as the doping amount of Mn increases. Both the CV and EIS results illustrate that a small amount of doped Mn will reduce the electrode polarization and electrochemical impedance of the samples and simultaneously improve the electrochemical performance. Among all the samples, the LiFe 0.98 Mn 0.02 PO 4 /C sample has a desirable electrochemical performance, with its specific discharge capacity reaching 156.0 mAh g −1 at a rate of 0.1 C. Even at a high rate of 5 C, it can still reach 110.0 mAh g −1 . All the results indicate that an appropriate amount of doped Mn has an emphatic effect on the electrochemical performance of LiFePO 4 /C.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
纳米材料
·
固态化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2017
·
IF 3.012
Y.X. Wei,Y.B. Ma,M. Chen,W.M. Liu,L. Li,Y. Yan
Electrochromic devices (ECDs) based on WO 3 and Ti doped V 2 O 5 films are fabricated by using lithium (LiClO 4 ) liquid electrolyte containing ferrocene redox couple . The addition of ferrocene in electrolyte enhances electrochromic properties of device. The device based on LiClO 4 -Ferrocene electrolyte has larger charge density than that based on LiClO 4 electrolyte. In the 600–1500 nm wavelength range, the transmittance of colored device is under 2% and it has faster coloring response. At 680 nm wavelength, it shows larger changes in transmittance from 68% to 1.8% while device based on LiClO 4 electrolyte changes transmittance from 68.3% to 11.5%. The cycling data reveal that device based on LiClO 4 -Ferrocene electrolyte can yield more stable electrochromic properties at 65 °C than room temperature. In order to deeper understand the effect of electrolyte on films and devices, electrochemical impedance spectroscopy (EIS) and the voltage distribution of films based on an analog cell are separately measured and analyzed in LiClO 4 and LiClO 4 -Ferrocene electrolytes. Results indicate that compared with LiClO 4 electrolyte, films have lower charge-transfer resistance and the distributed voltage on Ti doped V 2 O 5 film is larger in LiClO 4 -Ferrocene electrolyte, which can enhance optical properties of ECD by improving charge density of Ti doped V 2 O 5 film.
研究领域:
材料科学
·
电化学
·
功能材料
·
纳米科技
·
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）