Metal-based Nanoparticles as Conductive Mediators in Electrochemical Sensors: A Mini Review

2019 ◽  
Vol 15 (2) ◽  
pp. 136-142 ◽  
Author(s):  
Hassan Karimi-Maleh ◽  
Fatemeh Karimi ◽  
Abdollah FallahShojaei ◽  
Khalil Tabatabaeian ◽  
Mohammad Arshadi ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Electrochemical Sensors ◽  
High Surface ◽  
High Surface Area ◽  
Modified Electrodes ◽  
Charge Transfer Resistance ◽  
Au Nanoparticle ◽  
Transfer Resistance ◽  
New Approach ◽  
Low Charge

Background: Modified electrodes are a new approach to improving the characteristics of the electrochemical sensors. The high conductivity and low charge transfer resistance are the major properties of new mediators for improving electrochemical sensors. Metal-based nanoparticles showed good electrical conductivity and can be selected as the suitbale mediator for modified electrodes. Objective: Recently, metal-based nanoparticles, such as Au nanoparticle, TiO2 nanoparticle, Fe3O4 nanoparticle and etc. were suggested as the suitable mediator for modification of solid electrodes. The high surface area and low charge transfer resistance of metal-based nanoparticles, suggested the exceptional intermediate in the electrochemical sensors. Here, we tried to consider these exceptional effects through reviewing some of the recently published works.

Highly Active TiO2-MoS2 Composite for Visible Light Photocatalytic Applications

2015 ◽  
Vol 830-831 ◽  
pp. 553-556 ◽  
Author(s):  
S.M.Y. Mohamed Mukthar Ali ◽  
K.Y. Sandhya
Keyword(s):  
Visible Light ◽  
High Surface ◽  
High Surface Area ◽  
Titanium Isopropoxide ◽  
Solvent Mixture ◽  
Charge Transfer Resistance ◽  
Transfer Resistance ◽  
Highly Active ◽  
Visible Light Active ◽  
Light Absorbance

Efficient visible light active TiO2-Molybdenum sulphide (TiO2-MoS2) composites were prepared by solvothermal methodfrom titanium isopropoxide and commercial MoS2 using N-methyl 2-pyrrolidone (NMP) and isopropanol (IPA) solvent mixture. Extended absorption band edge and enhanced visible light absorbance are supplemented intothe TiO2-MoS2 composites by this method. While TiO2 shows ~48% visible light photodegradation of rhodamine B (RhB) the TiO2-MoS2(0.24) exhibits~74% of degradation. In addition to the visible light enhancement, very high surface area and reduced charge transfer resistance at the interfaces are attributed to the enhanced activity of the composite.

scholarly journals Dye-Sensitized Solar Cells Using Mesocarbon Microbead-Based Counter Electrodes

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Chien-Te Hsieh ◽  
Bing-Hao Yang ◽  
Wei-Yu Chen
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Dye Sensitized Solar Cells ◽  
Charge Transfer Resistance ◽  
Counter Electrodes ◽  
Transfer Resistance ◽  
Dye Sensitized ◽  
Catalytic Sites ◽  
Low Charge ◽  
Sensitized Solar Cells

The dye-sensitized solar cells (DSCs) equipped with mesocarbon microbead (MCMB)-based counter electrodes were explored to examine their cell performance. Three types of nanosized additives including platinum, carbon nanotubes (CNTs), and carbon black (CB) are well dispersed and coated over microscaled MCMB powders. In the design of the counter electrodes, the MCMB graphite offers an excellent medium that allows charge transfer from the ITO substrate to the dye molecule. The active materials such as Pt, CNT, and nanosize CB act as an active site provider for the redox reaction. Among these counter electrodes, the DSCs fabricated with CB electrode exhibit the highest power conversion efficiency. This improved efficiency can be attributed to the fact that the CB nanoparticles not only offer a large number of catalytic sites but also low charge transfer resistance, facilitating a rapid reaction kinetics. Such design of carbon counter electrode has been confirmed to be a promising candidate for replacing Pt electrodes.

Three-dimensional Co 3 O 4 Nanowire@NiO Nanosheet Core-shell Construction Arrays as Electrodes for Low Charge Transfer Resistance

2017 ◽  
Vol 241 ◽  
pp. 220-228 ◽  
Author(s):  
Dandan Han ◽  
Xiaoyan Jing ◽  
Jun Wang ◽  
Yuansheng Ding ◽  
Zhenyu Cheng ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Three Dimensional ◽  
Charge Transfer Resistance ◽  
Core Shell ◽  
Transfer Resistance ◽  
Low Charge

scholarly journals Electrochemical Biosensors Based on Nanostructured Carbon Black: A Review

2017 ◽  
Vol 2017 ◽  
pp. 1-14 ◽  
Author(s):  
Tiago Almeida Silva ◽  
Fernando Cruz Moraes ◽  
Bruno Campos Janegitz ◽  
Orlando Fatibello-Filho
Keyword(s):  
Carbon Black ◽  
Surface Area ◽  
Electrochemical Sensors ◽  
Low Cost ◽  
High Surface ◽  
Enzymatic Catalysis ◽  
High Surface Area ◽  
Modified Electrodes ◽  
Nanostructured Material ◽  
Future Challenges

Carbon black (CB) is a nanostructured material widely used in several industrial processes. This nanomaterial features a set of remarkable properties including high surface area, high thermal and electrical conductivity, and very low cost. Several studies have explored the applicability of CB in electrochemical fields. Recent data showed that modified electrodes based on CB present fast charge transfer and high electroactive surface area, comparable to carbon nanotubes and graphene. These characteristics make CB a promising candidate for the design of electrochemical sensors and biosensors. In this review, we highlight recent advances in the use of CB as a template for biosensing. As will be seen, we discuss the main biosensing strategies adopted for enzymatic catalysis for several target analytes, such as glucose, hydrogen peroxide, and environmental contaminants. Recent applications of CB on DNA-based biosensors are also described. Finally, future challenges and trends of CB use in bioanalytical chemistry are discussed.

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