ELECTROCHIMICA ACTA
·
2013
·
IF 3.777
Yuqing Miao,Zhuoyuan Yang,Xiaoyan Liu,Lina Xu,Lei Ouyang,Yingying Gu,Haizhou Chang,Ruizhuo Ouyang
Bismuth has been attracting research interest in recent decades due to its unique properties. Especially, there is a great difference for bismuth between its surface and bulk material properties in which the surfaces are much better metals than the bulk. A ultrathin layer of bismuth was adsorbed onto platinum electrode surface by simple self-assembly. Compared with bare platinum electrode, two greatly increased oxidation peaks were observed at negative and positive potential area with the obtained Bi III -Pt electrode, where Bi 0 or Bi III tends to adsorb more OH which is shared by the below adjacent platinum atom to form a structure of Pt-OH with high electrocatalytical activity. The Bi III -Pt electrode gives high sensitivity and excellent linearship of non-enzymatic glucose sensing, showing potential application for fuel cell, electrocatalysis and electroanalysis.
研究领域:
材料科学
·
电化学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Xiaoqing Jiang,Jie Zou,Yongjian Ni,Yuheng Wang,Xianwei Qian,Xuebin Li,Shihao Wei,Yuanjie Su,Guangzhong Xie,Mingjun Zhou,Jiawen Jian
The catalytic activity of an oxygen-pumping electrode is very important to the performance of amperometric NO x (NO and NO 2 ) sensors. To enhance the stability of electrochemical NO x sensors based on Pt electrodes, we fabricated sensitive electrodes of Pt-based materials doped with small and different Au contents on 8% mol Y 2 O 3 -stabilized ZrO 2 (8YSZ) solid electrolyte substrates by screen printing and high-temperature co-firing. The effects of Au on the porous Pt electrode’s catalytic activity and long-term stability were investigated, and the results are as follows. First, the catalytic capacity of the Pt–Au alloy electrode decreases with increasing Au content due to the inhibition of the oxygen adsorption on Au, which decreases the amount of oxygen participating in the reaction at triple-phase boundaries (TPBs). Second, the catalytic ability of the alloy electrode decreases exponentially with aging time due to the reduction in the length of TPBs caused by the significant reduction in the number of holes in the electrode, and the oxidation of Pt. In addition, the conductivity decay rate of the electrode decreases with increasing Au doping. This indicates that Pt-based electrodes doped with varying Au contents, long-term, and high-temperature aging have notably regular effects on the catalytic activity of oxygen-pumping electrodes, for which we have developed a model of Au passivation and the synergistic effect of aging time on the activity of Pt-based oxygen-pumping electrodes.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·Vol. 171
·期 10
·107506
·
IF 3.1
Chen-Yang Han,Kun-Zhi Wang,Xin Chen,Zhencheng Chen,Guo-Cheng Han,Xiao-Zhen Feng,Heinz-Bernhard Kraatz
Hydrogen peroxide (H2O2) possesses disinfectant, antiseptic, deodorizing, and cleansing properties. It is commonly used to clean wounds, ulcers, abscessed sinuses, and pus in the ear. Herein, a colorimetric-electrochemical bimodal method for the detection of hydrogen peroxide in serum was constructed, when using a platinum sheet electrode electrocatalyzes H2O2 producing hydroxyl radical, resulting in oxidising TMB and giving a color and current change. After optimaztion, cyclic voltammetry, differential pulse voltammetry and ultraviolet spectrophotometry constituting a colorimetric-electrochemical bimodal method were used to establish four linear relationships within the concentration range of 10.00–1000.00 μM. The limit of detection was found to be 3.33 μM. Additionally, the method's recoveries ranged from 98.88% to 101.10% with a relative standard deviation of no more than 3.70% when using the standard addition method in serum, which indicates its potential for practical medical testing.
研究领域:
分析化学
·
医学检测
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2014
·Vol. 30
·期 2
·293-296
·
IF 1.119
Zhang Yinxu,Mao Xinbiao,Ren Shuying,Ma Chunan
Ionic liquid, 1-butyl-3-methylimidazolium acetate(BMImAc), was used in the electrochemical reduction of nitrobenzene. The electro-reduction of nitrobenzene on platinum electrode was studied by cyclic voltammetry(CV), in situ Fourier transform infrared(FTIR) spectroscopy and constant-potential electrolysis. The experimental results show that electrochemical reduction process of nitrobenzene was controlled by diffusion, the main reduction product was azobenzen at −1.45 V, and the influences of scan rate and temperature on the electrochemical behaviors were obviously. A reduction mechanism of nitrobenzene in an ionic liquid was a probable ‘nitrobenzene→nitroso-benzene→azobenzene→aniline’ main reductive reaction route.
研究领域:
化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Reports: Energy
·
2023
·
IF 0
Zhenmin Zhang,Dezhang Ren,Dian Zhang,Tiantian Hu,Congyuan Zeng,Nengneng Xu,Zhibao Huo,Jinli Qiao
The deoxygenation of organic acids, important biomass feedstocks and derivatives, to synthesize hydrocarbon products under mild electrochemical conditions, holds significant importance for the production of carbon-neutral biofuels. There is still limited research on the influential factors of the electrochemical decarboxylation reaction of medium-chain fatty acids. In this study, n -octanoic acid (OA) was chosen as the research subject to investigate the electrochemical decarboxylation behavior of OA on a platinum electrode, focusing on the influence of different alkali metal cations (Li + , Na + , K + ), common anions (SO 4 2− , Cl − ), and electrolyte pH. It was found that KOH as an electrolyte exhibited the best performance for OA. Possibly, the larger size of K + increased the alkalinity of the electrode surface, facilitating OA deprotonation. LiOH electrolyte reduced the solubility of OA, thereby inhibiting the decarboxylation reaction. SO 4 2− exhibited a weak promoting effect on the decarboxylation reaction of OA, while Cl − showed no adverse effect although Cl − may adsorb on the electrode surface. Furthermore, unlike short-chain fatty acids, medium-chain OA can only achieve efficient decarboxylation under alkaline conditions due to its solubility properties. This study provides references and foundations for future efforts to enhance the efficiency of electrochemical decarboxylation synthesis of hydrocarbon biofuels from medium-chain fatty acids.
研究领域:
电化学
·
能源化学
·
生物质转化
·
材料科学
✓ 已验证
DOI
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
·
2012
·Vol. 59
·期 7
·879-883
·
IF 0.678
Jing Zhou,Ying Xu,Le Wang,Jie Liu,Yamin Li,Baoxian Ye
An ultrastable chemical modified electrode (CME) was fabricated conveniently based on gold film by pulse plating of chloroauric acid on Pt disk electrode. As a novel modifying method of making CME, the CME was characterized by electrochemical impedance spectroscopy (EIS) and used as a voltammetric sensor for Ketamine. This thin gold film modified electrode exhibited excellent electrocatalysis to Ketamine oxidation. Based on this CME, detection of Ketamine by voltammetry was first erected with a fast-response and wide responding linear range. Further experiments demonstrated that this CME has good stability, repeatability and reproducibility. The established method is accurate, reliable, and can be used for the quality control of Ketamine hydrochloride injection.
研究领域:
分析化学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Wei Liu,Kangjie Lyu,Li Xiao,Juntao Lu,Lin Zhuang
The mechanism of hydrogen oxidation reaction (HOR) in alkaline media is still under debate. In this work, we have systemically examined the HOR performance on planar Pt electrodes modified with ten different kinds of metal hydroxides/oxides (metal = Mg, Cr, Mn, Fe, Co, Ni, Cu, Ru, La and Ce). The HOR exchange current density ( i 0 ) increases monotonically with higher electrode’s oxophilicity, which is determined by the current densities of CO stripping at 0.4 V vs. RHE ( i CO @0.4 V). However, the Ru modification exhibits a clear deviation from the monotonic relation and it demonstrates a superior catalytic activity towards HOR, relative to other metal modifications. This unexpected result is ascribed to the reduction in hydrogen binding energy (HBE) owing to the modification of metallic Ru rather than its corresponding hydroxide or oxide. The present study indicates that the electronic effect and the oxophilic effect co-exist in the HOR on Pt-based catalysts in alkaline media, but the former one is of more significance.
研究领域:
电化学
·
材料科学
✓ 已验证
DOI
高影响因子
SURFACE REVIEW AND LETTERS
·
2014
·
IF 0.367
ZHUOYUAN YANG,YUQING MIAO,TIANRUI WANG,MINGSHU XIAO,XIAOCAI LIANG,YANG YANG,WEIWEI LI
In this paper, we first fabricated a nanoPt modified platinum electrode. Then through a simple method, the electrode surface was introduced with a submonolayer of bismuth that acted as an effective promoter. Cyclic voltammetry and other characterizations were employed. The obtained Bi III / nanoPt / Pt electrode exhibited two greatly increased oxidation peaks at negative and positive potential areas, respectively. The signals were far larger than that of platinum electrode because of the large true surface area of nanoparticles and the catalysis of bismuth adsorbed on platinum. In the presence of bismuth, the platinum active sites could combine with more OH - from bismuth hydroxyl to form a new active site for the oxidation of glucose. The prepared Bi III / nanoPt / Pt electrode given high sensitivity and excellent linearship to glucose detection and showed the potential application in the areas of electrocatalysis or electroanalysis.
研究领域:
电化学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Tianbao Li,Juan Xu,Lei Zhao,Shaofei Shen,Maosen Yuan,Jinyi Wang
A platinum electrode with two-dimensional ordered arrays of hemispherical cavities was fabricated via the inverted crystal template technique. Due to the overlap of the diffusion zones, voltammetric response of ferricyanide at the cavity platinum (CPt) electrode was almost the same as that at a flat platinum (FPt) electrode. Uniformly sized poly( N -isopropylacrylamide-co-acrylic acid) (NIPA/AA) hydrogel particles were synthesized and modified into the cavities of the CPt electrode. Voltammograms of the NIPA/AA-CPt electrode showed a cathodic peak at −0.38 V in the negative potential range. The peak was attributed to the reduction of H + which supplied from the dissociation of carboxyl groups of the absorbed particles. Compared with the peak observed at NIPA/AA-FPt electrode, the peak potential was shifted in the positive direction by 0.19 V. The peak current was increased linearly with the loaded amount of the particles, and was controlled by the participation of diffusion, adsorption and dissociation. The electron-transfer rate constant between dissociated H + and the CPt electrode was estimated to be one order smaller than that between ferricyanide and the FPt electrode.
研究领域:
分析化学
·
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2011
·Vol. 175
·期 1
·193-199
·
IF 2.578
Yang Hui,Li Xin-chun,Yang Fan,Feng Jun,Lin Miao-yin,Chen Zuan-guang
We describe an efficient and easily fabricated electrochemiluminescence detection system for microchip capillary electrophoresis. A 300-μm-diameter platinum disc working electrode was embedded in a titanium tube which provides an adequate holding for working electrode and acts as counter electrode. We also have designed a simplified detection cell with a guide channel for the electrode. The integrated working-counter electrode can be easily aligned to the outlet of the separation channel through the guide channel. The functionality of the system was demonstrated by separation and detection of proline and tripropylamine. The response to proline is linear in the range from 5 μM to 5,000 μM, and the detection limit is 1.0 μM (S/N = 3). The system was further applied to the determination of chlorpromazine hydrochloride in pharmaceutical formulations. The system is believed to have potential applications in pharmaceutical analysis.
We described an efficient and easily fabricated electrochemiluminescence detection system for microchip capillary electrophoresis. The functionality of the system was demonstrated by separation and detection of proline and tripropylamine. The response to proline is linear in the range from 5 μM to 5,000 μM, and the detection limit is 1.0 μM (S/N = 3).
研究领域:
分析化学
·
制药工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Chenjie Han,Yeqing Lyu,Shaona Wang,Biao Liu,Yi Zhang,Hao Du
Ethanol is considered to be one of the most promising fuels for fuel cells. However, ethanol fuel cells have a sluggish Faraday efficiency due to complex interactions between the electrolyte, electrode, and ethanol. Recent studies have further suggested that noncovalent interactions originated from the hydrated alkali metal cations and the adsorbed OHad at the Pt electrode surface also played an important role in the electron transfer. In this regard, the noncovalent interactions in different alkali metal hydroxide (AMH) solutions have been systematically investigated in this study, and it was observed that the noncovalent interactions could result in the occupation of the Pt electrode surface active sites and sluggish migration of ethanol molecules in the electrical double layer, significantly affecting the electro-oxidation efficiency. Further, it was concluded that the electro-oxidation efficiency in different AMH solutions followed the order of K+ > Na+ > Rb+ > Cs+ > Li+ due to the noncovalent interactions.
研究领域:
化学
·
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Ping Zhou,Lina Yao,Bin Su
In this work, we report a new approach to fabricate the nanopore array electrode (NAE) by transferring silica nanochannel membrane (SNM) to the surface of Pt electrode (0.5 mm in diameter) sealed by glass capillary (designated as Pt-NAE for simplicity). The SNM is supported via the irreversible covalent-bond formation with the surrounding glass capillary treated by plasma, thus providing long-term stability to Pt-NAE. Meanwhile, this fabrication process does not require pregrafting or premodification of Pt electrode surface, providing well-defined active surface domains. Thanks to the small pore diameter (∼2.3 nm) and negatively charged channel walls, the SNM is permselective and thus the electrochemical behavior of Pt-NAE is dependent on both electrolyte concentration and charge state of redox molecules. The permeability of SNM was determined by the scanning electrochemical microscopy (SECM) approach curve measurements coupled with finite-element simulations from a quantitative viewpoint. The permeability of anionic Ru(CN)64– was varied from 150 to 10.3 μm s–1 as the electrolyte concentration decreased from 1.0 to 0.01 M, while there is no obvious change for cationic Ru(NH3)63+. Finally, the as-prepared Pt-NAE is able to continuously monitor dissolved oxygen for up to 2 h in a solution containing biofouling reagents, exhibiting an enhanced antifouling ability and therefore excellent current stability. We believe the NAE with unique mass transport properties can be extended further for other analytical applications.
研究领域:
分析化学
·
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）