Enhanced electrochemical performances of Li-rich layered oxides by surface modification with reduced graphene oxide/AlPO4 hybrid coating

2014 ◽  
Vol 2 (23) ◽  
pp. 8696 ◽  
Author(s):  
Il Tae Kim ◽  
James C. Knight ◽  
Hugo Celio ◽  
Arumugam Manthiram
Keyword(s):  
Surface Modification ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Hybrid Coating ◽  
Electrochemical Performances ◽  
Layered Oxides ◽  
Reduced Graphene

scholarly journals Reduced Graphene Oxide-Supported Pt-Based Catalysts for PEM Fuel Cells with Enhanced Activity and Stability

Catalysts ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 256
Author(s):  
Irina V. Pushkareva ◽  
Artem S. Pushkarev ◽  
Valery N. Kalinichenko ◽  
Ratibor G. Chumakov ◽  
Maksim A. Soloviev ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Surface Area ◽  
Pem Fuel Cells ◽  
Polyol Process ◽  
Proton Exchange ◽  
Active Surface Area ◽  
Electrochemical Performances ◽  
Simultaneous Reduction ◽  
Reduced Graphene

Platinum (Pt)-based electrocatalysts supported by reduced graphene oxide (RGO) were synthesized using two different methods, namely: (i) a conventional two-step polyol process using RGO as the substrate, and (ii) a modified polyol process implicating the simultaneous reduction of a Pt nanoparticle precursor and graphene oxide (GO). The structure, morphology, and electrochemical performances of the obtained Pt/RGO catalysts were studied and compared with a reference Pt/carbon black Vulcan XC-72 (C) sample. It was shown that the Pt/RGO obtained by the optimized simultaneous reduction process had higher Pt utilization and electrochemically active surface area (EASA) values, and a better performance stability. The use of this catalyst at the cathode of a proton exchange membrane fuel cell (PEMFC) led to an increase in its maximum power density of up to 17%, and significantly enhanced its performance especially at high current densities. It is possible to conclude that the optimized synthesis procedure allows for a more uniform distribution of the Pt nanoparticles and ensures better binding of the particles to the surface of the support. The advantages of Pt/RGO synthesized in this way over conventional Pt/C are the high electrical conductivity and specific surface area provided by RGO, as well as a reduction in the percolation limit of the components of the electrocatalytic layer due to the high aspect ratio of RGO.

scholarly journals The effect of surface modification by reduced graphene oxide on the electrocatalytic activity of nickel towards the hydrogen evolution reaction

2015 ◽  
Vol 17 (40) ◽  
pp. 26864-26874 ◽  
Author(s):  
Debabrata Chanda ◽  
Jaromír Hnát ◽  
Ana S. Dobrota ◽  
Igor A. Pašti ◽  
Martin Paidar ◽  
...  
Keyword(s):  
Surface Modification ◽  
Graphene Oxide ◽  
Dft Calculations ◽  
Reduced Graphene Oxide ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Electrocatalytic Activity ◽  
Active Sites ◽  
Reduced Graphene ◽  
Effect Of Surface

The RGO-modified Ni electrode exhibited outstanding activity towards HER. DFT calculations indicate that H atoms, formed upon H2O discharge on Ni, spill onto the RGO, enabling continuous clearance of Ni-active sites.

Characteristics of ultrasonication assisted assembly of gold nanoparticles in hydrazine reduced graphene oxide

RSC Advances ◽  
2015 ◽  
Vol 5 (130) ◽  
pp. 107348-107354 ◽  
Author(s):  
Kashyap Dave ◽  
Kyung Hee Park ◽  
Marshal Dhayal
Keyword(s):  
Gold Nanoparticles ◽  
Surface Modification ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Organic Molecules ◽  
Gold Chloride ◽  
Reduced Graphene ◽  
Gold Composites ◽  
Graphene Oxide Sheets

Graphene gold composites were synthesized by ultrasonication assisted in situ reduction of diffused gold chloride within hydrazine reduced graphene oxide sheets without surface modification or functionalization with organic molecules.

Hydrothermal synthesis of Fe3O4/RGO composites and investigation of electrochemical performances for energy storage applications

RSC Advances ◽  
2014 ◽  
Vol 4 (84) ◽  
pp. 44777-44785 ◽  
Author(s):  
Sanjit Saha ◽  
Milan Jana ◽  
Pranab Samanta ◽  
Naresh Chandra Murmu ◽  
Nam Hoon Kim ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Energy Storage ◽  
Hydrothermal Synthesis ◽  
Hydrothermal Method ◽  
Reduced Graphene Oxide ◽  
Electrochemical Performances ◽  
Reduced Graphene ◽  
One Step ◽  
Energy Storage Applications ◽  
Highly Porous

Highly porous nano-structured Fe3O4 particles were successfully prepared on the surface of reduced graphene oxide (RGO) sheets through a one-step hydrothermal method.

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