RDE Measurements of ORR Activity of Pt[sub 1−x]Ir[sub x] (0

2010 ◽  
Vol 157 (2) ◽  
pp. B207 ◽  
Author(s):  
Gary Chih-Kang Liu ◽  
R. J. Sanderson ◽  
George Vernstrom ◽  
D. A. Stevens ◽  
R. T. Atanasoski ◽  
...  
Keyword(s):  
Surface Area ◽  
Glassy Carbon ◽  
High Surface ◽  
High Surface Area ◽  
Orr Activity

scholarly journals Electrochemical Sensor Based on Prussian Blue Electrochemically Deposited at ZrO2 Doped Carbon Nanotubes Glassy Carbon Modified Electrode

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1328 ◽  
Author(s):  
Marlon Danny Jerez-Masaquiza ◽  
Lenys Fernández ◽  
Gema González ◽  
Marjorie Montero-Jiménez ◽  
Patricio J. Espinoza-Montero
Keyword(s):  
Carbon Nanotubes ◽  
Electrochemical Properties ◽  
Electrochemical Sensor ◽  
Prussian Blue ◽  
Surface Area ◽  
Glassy Carbon ◽  
High Surface ◽  
High Surface Area ◽  
Electrochemically Deposited ◽  
Area X

In this work, a new hydrogen peroxide (H2O2) electrochemical sensor was fabricated. Prussian blue (PB) was electrodeposited on a glassy carbon (GC) electrode modified with zirconia doped functionalized carbon nanotubes (ZrO2-fCNTs), (PB/ZrO2-fCNTs/GC). The morphology and structure of the nanostructured system were characterized by scanning and transmission electron microscopy (TEM), atomic force microscopy (AFM), specific surface area, X-ray diffraction (XRD), thermogravimetric analysis (TGA), Raman and Fourier transform infrared (FTIR) spectroscopy. The electrochemical properties were studied by cyclic voltammetry (CV) and chronoamperometry (CA). Zirconia nanocrystallites (6.6 ± 1.8 nm) with cubic crystal structure were directly synthesized on the fCNTs walls, obtaining a well dispersed distribution with a high surface area. The experimental results indicate that the ZrO2-fCNTs nanostructured system exhibits good electrochemical properties and could be tunable by enhancing the modification conditions and method of synthesis. The fabricated sensor could be used to efficiently detect H2O2, presenting a good linear relationship between the H2O2 concentration and the peak current, with quantification limit (LQ) of the 10.91 μmol·L−1 and detection limit (LD) of 3.5913 μmol·L−1.

RRDE Measurements of ORR Activity of Pt1-xIrx (0 < x < 0.3) on High Surface Area NSTF-coated GC Disks

2019 ◽  
Vol 25 (1) ◽  
pp. 625-634 ◽  
Author(s):  
Gary C. Liu ◽  
Robbie Sanderson ◽  
George Verndstorm ◽  
David Stevens ◽  
Radoslav Atanasoski ◽  
...  
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Orr Activity

scholarly journals High surface area micro-mesoporous graphene for electrochemical applications

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Piotr Kamedulski ◽  
Malgorzata Skorupska ◽  
Pawel Binkowski ◽  
Weronika Arendarska ◽  
Anna Ilnicka ◽  
...  
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
External Pressure ◽  
Reduction Reaction ◽  
Carbonization Temperature ◽  
Structural Factors ◽  
Electrochemical Studies ◽  
3D Graphene ◽  
Orr Activity

AbstractThe manuscript presents results on the influence of external pressure on graphene exfoliation and subsequent 3D structuring by means of liquid-phase exfoliation. In contrast to known and applied exfoliation methods, the current study exploits the enhancement of splitting forces caused by the application of high pressure. The manufacturing pathway allowed to increase the surface area from 750 m2/g (nanoplatelets) to ca. 1100 m2/g (after 3D structuring). Electrochemical studies revealed that the 3D graphene materials were active in the oxygen reduction reaction (ORR). The outstanding ORR activity of 3D structured graphene materials should not be ascribed to heteroatom catalytic centers since such heteroatoms were successively removed upon increasing the carbonization temperature. XPS data showed that the presence of transition metals and nitrogen (usually regarded as catalytic centers) in G-materials was marginal. The results highlight the importance of structural factors of electrodes in the case of graphene-based materials for Zn–air batteries and ORR.

A new class of electroactive Fe- and P-functionalized graphene for oxygen reduction

2015 ◽  
Vol 3 (20) ◽  
pp. 11031-11039 ◽  
Author(s):  
Fatemeh Razmjooei ◽  
Kiran Pal Singh ◽  
Eun Jin Bae ◽  
Jong-Sung Yu
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Functionalized Graphene ◽  
New Class ◽  
Reduced Graphene ◽  
Acidic Conditions ◽  
Orr Activity

A new class of electroactive Fe- and P-functionalized reduced graphene oxide is prepared, which illustrates high ORR activity both in alkaline and acidic conditions due to its high surface area and formation of active Fe–P complex.

Tenacious Mass Transfer Limitations Drive Catalytic Selectivity during Electrochemical Carbon Dioxide Reduction

2019 ◽  
Author(s):  
Kailun Yang ◽  
Recep Kas ◽  
Wilson A. Smith
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Catalyst Layer ◽  
Active Surface ◽  
Active Surface Area ◽  
High Concentration ◽  
Copper Electrodes ◽  
Surface Enhanced ◽  
Local Current

<p>This study evaluated the performance of the commonly used strong buffer electrolytes, i.e. phosphate buffers, during CO<sub>2</sub> electroreduction in neutral pH conditions by using in-situ surface enhanced infrared absorption spectroscopy (SEIRAS). Unfortunately, the buffers break down a lot faster than anticipated which has serious implications on many studies in the literature such as selectivity and kinetic analysis of the electrocatalysts. Increasing electrolyte concentration, surprisingly, did not extend the potential window of the phosphate buffers due to dramatic increase in hydrogen evolution reaction. Even high concentration phosphate buffers (1 M) break down within the potentials (-1 V vs RHE) where hydrocarbons are formed on copper electrodes. We have extended the discussion to high surface area electrodes by evaluating electrodes composed of copper nanowires. We would like highlight that it is not possible to cope with high local current densities on these high surface area electrodes by using high buffer capacity solutions and the CO<sub>2</sub> electrocatalysts are needed to be evaluated by casting thin nanoparticle films onto inert substrates as commonly employed in fuel cell reactions and up to now scarcely employed in CO<sub>2</sub> electroreduction. In addition, we underscore that normalization of the electrocatalytic activity to the electrochemical active surface area is not the ultimate solution due to concentration gradient along the catalyst layer.This will “underestimate” the activity of high surface electrocatalyst and the degree of underestimation will depend on the thickness, porosity and morphology of the catalyst layer. </p> <p> </p>

scholarly journals Rugae-like FeP nanocrystal assembly on a carbon cloth: an exceptionally efficient and stable cathode for hydrogen evolution

Nanoscale ◽  
2015 ◽  
Vol 7 (25) ◽  
pp. 10974-10981 ◽  
Author(s):  
Xiulin Yang ◽  
Ang-Yu Lu ◽  
Yihan Zhu ◽  
Shixiong Min ◽  
Mohamed Nejib Hedhili ◽  
...  
Keyword(s):  
Gas Phase ◽  
Surface Area ◽  
Hydrogen Evolution ◽  
Hydrogen Generation ◽  
High Surface ◽  
High Surface Area ◽  
Catalytic Efficiency ◽  
Carbon Cloth ◽  
Nanocrystal Assembly

High surface area FeP nanosheets on a carbon cloth were prepared by gas phase phosphidation of electroplated FeOOH, which exhibit exceptionally high catalytic efficiency and stability for hydrogen generation.

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