electrochemical activity
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Wenxi Zhao ◽  
Xiaoqing Ma ◽  
Luchao Yue ◽  
Longcheng Zhang ◽  
Yongsong Luo ◽  

Metal selenides have attracted great concern for high-efficiency sodium storage thanks to the remarkable advantages of physicochemical features and electrochemical activity. However, the enormous issues (e.g. poor intrinsic conductivity, severe...

Sensors ◽  
2021 ◽  
Vol 22 (1) ◽  
pp. 311
Natalia Yu. Stozhko ◽  
Maria A. Bukharinova ◽  
Ekaterina I. Khamzina ◽  
Aleksey V. Tarasov

Gold nanoparticles are widely used in electrosensing. The current trend is to phytosynthesize gold nanoparticles (phyto-AuNPs) on the basis of the “green” chemistry approach. Phyto-AuNPs are biologically and catalytically active, stable and biocompatible, which opens up broad perspectives in a variety of applications, including tactile, wearable (bio)sensors. However, the electrochemistry of phytosynthesized nanoparticles is not sufficiently studied. This work offers a comprehensive study of the electrochemical activity of phyto-AuNPs depending on the synthesis conditions. It was found that with an increase in the aliquot of the plant extract, its antioxidant activity (AOA) and pH, the electrochemical activity of phyto-AuNPs grows, which is reflected in the peak potential decrease and an increase in the peak current of phyto-AuNPs electrooxidation. It has been shown that AOA is an important parameter for obtaining phyto-AuNPs with desired properties. Electrodes modified with phyto-AuNPs have demonstrated better analytical characteristics than electrodes with citrate AuNPs in detecting uric and ascorbic acids under model conditions. The data about the phyto-AuNPs’ electrochemistry may be useful for creating highly effective epidermal sensors with good biocompatibility.

Lu Han ◽  
Yuwenxi Zhang ◽  
Yangyang Guo ◽  
Yangjie Wan ◽  
Lingling Fan ◽  

Abstract In this work, the self-corrosion and discharge performance of the as-cast Mg-xSn (x=1, 5, 9 wt.%) anodes for primary Mg-air batteries were studied through microstructure characterization, electrochemical testing and discharge experiments. With the increase of Sn content, the volume fraction of the Mg2Sn phase increases, promoting dendrite refining. According to the electrochemical test, the Mg-1Sn anode shows a higher open circuit potential, resulting in a stronger electrochemical activity. The polarization curve and electrochemical impedance spectra show the corrosion resistance order as Mg-1Sn>Mg-5Sn>Mg-9Sn. In the discharge measurement, the Mg-1Sn anode achieves the best average discharge voltage, anode efficiency, specific capacity, and energy density under all current densities tested. At 10 mA cm-2, the energy density of Mg-1Sn is 1239.621 mWh g-1, which is higher than the Mg-5Sn anode and Mg-9Sn anode, 37% and 25%, respectively. The optimal discharge performance of the Mg-1Sn anode is mainly attributed to the high electrochemical activity and the micron-sized Mg2Sn phase dispersed in the matrix, which facilitates more uniform dissolution.

Small ◽  
2021 ◽  
pp. 2105087
Jung‐Min Cho ◽  
Young‐Jin Ko ◽  
Hak‐Joo Lee ◽  
Heon‐Jin Choi ◽  
Young‐Joon Baik ◽  

Nadeem Asghar Khan ◽  
Iqbal Ahmad ◽  
Naghmana Rashid ◽  
Muhammad Nadeem Zafar ◽  
Farooq Khurum Shehzad ◽  

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