scholarly journals Synthesis and Characterizations of Zinc Oxide on Reduced Graphene Oxide for High Performance Electrocatalytic Reduction of Oxygen

Molecules ◽  
2018 ◽  
Vol 23 (12) ◽  
pp. 3227 ◽  
Author(s):  
Jiemei Yu ◽  
Taizhong Huang ◽  
Zhankun Jiang ◽  
Min Sun ◽  
Chengchun Tang
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
Fuel Cells ◽  
Oxygen Reduction ◽  
Reduced Graphene Oxide ◽  
Cyclic Voltammograms ◽  
High Electron ◽  
Disk Electrode ◽  
Zno Nps ◽  
Reduced Graphene

Electrocatalysts for the oxygen reduction (ORR) reaction play an important role in renewable energy technologies, including fuel cells and metal-air batteries. However, development of cost effective catalyst with high activity remains a great challenge. In this feature article, a hybrid material combining ZnO nanoparticles (NPs) with reduced graphene oxide (rGO) is applied as an efficient oxygen reduction electrocatalyst. It is fabricated through a facile one-step hydrothermal method, in which the formation of ZnO NPs and the reduction of graphene oxide are accomplished simultaneously. Transmission electron microscopy and scanning electron microscopy profiles reveal the uniform distribution of ZnO NPs on rGO sheets. Cyclic voltammograms, rotating disk electrode and rotating ring disk electrode measurements demonstrate that the hierarchical ZnO/rGO hybrid nanomaterial exhibits excellent electrocatalytic activity for ORR in alkaline medium, due to the high cathodic current density (9.21 × 10−5 mA/cm2), positive onset potential (−0.22 V), low H2O2 yield (less than 3%), and high electron transfer numbers (4e from O2 to H2O). The proposed catalyst is also compared with commercial Pt/C catalyst, comparable catalytic performance and better stability are obtained. It is expected that the ZnO/rGO hybrid could be used as promising non-precious metal cathode in alkaline fuel cells.

Nitrogen/sulfur dual-doped reduced graphene oxide supported CuFeS2 as an efficient electrocatalyst for the oxygen reduction reaction

2018 ◽  
Vol 42 (3) ◽  
pp. 2081-2088 ◽  
Author(s):  
Man Zhang ◽  
Wei Hong ◽  
Ruinan Xue ◽  
Lingzhi Li ◽  
Guanbo Huang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Fuel Cells ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduced Graphene Oxide ◽  
Low Cost ◽  
Reduction Reaction ◽  
Reduced Graphene

At present, low-cost and efficient electrocatalysts for accelerating the oxygen reduction reaction in fuel cells are highly desired.

scholarly journals Thermally reduced mesoporous manganese MOF @reduced graphene oxide nanocomposite as bifunctional electrocatalyst for oxygen reduction and evolution

RSC Advances ◽  
2020 ◽  
Vol 10 (46) ◽  
pp. 27728-27742 ◽  
Author(s):  
Abdul Wahab ◽  
Naseem Iqbal ◽  
Tayyaba Noor ◽  
Sheeraz Ashraf ◽  
Muhammad Arslan Raza ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Renewable Energy ◽  
Fuel Cells ◽  
Oxygen Reduction ◽  
Reduced Graphene Oxide ◽  
Crucial Role ◽  
Bifunctional Electrocatalyst ◽  
Renewable Energy Technologies ◽  
Energy Technologies ◽  
Reduced Graphene

Oxygen electrocatalysis plays a crucial role in harnessing energy from modern renewable energy technologies like fuel cells and metal–air batteries.

Co3O4 Nanoparticles-Modified α-MnO2 Nanorods Supported on Reduced Graphene Oxide as Cathode Catalyst for Oxygen Reduction Reaction in Alkaline Media

NANO ◽  
2016 ◽  
Vol 11 (11) ◽  
pp. 1650126 ◽  
Author(s):  
GuanHua Jin ◽  
Suqin Liu ◽  
Yaomin Li ◽  
Yang Guo ◽  
Zhiying Ding
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
Catalytic Activity ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduced Graphene Oxide ◽  
Reduction Reaction ◽  
Alkaline Media ◽  
X Ray ◽  
Reduced Graphene

Development of efficient electrocatalysts for the oxygen reduction reaction (ORR) remains a key issue for the commercialization of metal-air batteries. In this study, the novel structured Co3O4 nanoparticles-modified [Formula: see text]-MnO2 nanorods supported on reduced graphene oxide (Co3O4-MnO2/rGO) were synthesized with varying amounts of [Formula: see text]-MnO2 via a facile two-step hydrothermal method. The relationship between the physical properties and the electrochemical results was investigated using X-ray diffraction spectrum, scanning electron microscopy, transmission electron microscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, cyclic voltammograms, electrochemical impedance spectroscopy and rotating disk electrode. The as-prepared Co3O4–MnO2 nanohybrid exhibits enhanced catalytic activity for ORR under alkaline condition compared with MnO2/rGO and Co3O4/rGO. Furthermore, it mainly favors a direct 4e-reaction pathway for ORR, which is attributed to the well-designed structure, the synergistic effect between Co3O4 and [Formula: see text]-MnO2, and the covalent coupling between the Co3O4-MnO2 and reduced graphene oxide. The role of Co3O4 in Co3O4–MnO2 hybrid for catalyzing ORR also has been illustrated by varying the mass ratio of Co3O4 and MnO2, which reveals that the Co3O4–MnO2 with the ratio of 1:1 has better catalytic activity.

Co-N doped reduced graphene oxide as oxygen reduction electrocatalyst applied to Photocatalytic Fuel Cells

2018 ◽  
Vol 315 ◽  
pp. 31-35 ◽  
Author(s):  
Dimitrios Raptis ◽  
Alexandros Ploumistos ◽  
Eirini Zagoraiou ◽  
Eleni Thomou ◽  
Maria Daletou ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Fuel Cells ◽  
Oxygen Reduction ◽  
Reduced Graphene Oxide ◽  
Reduced Graphene

scholarly journals Novel Composite Electrode of the Reduced Graphene Oxide Nanosheets with Gold Nanoparticles Modified by Glucose Oxidase for Electrochemical Reactions

Catalysts ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 764 ◽  
Author(s):  
Dong ◽  
Yu ◽  
Liu ◽  
Liu ◽  
Shao ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Gold Nanoparticles ◽  
Graphene Oxide ◽  
Glucose Oxidase ◽  
Reduced Graphene Oxide ◽  
Direct Electron Transfer ◽  
Cyclic Voltammograms ◽  
Graphene Oxide Nanosheets ◽  
X Ray ◽  
Reduced Graphene

Graphene-based composites have been widely explored for electrode and electrocatalyst materials for electrochemical energy systems. In this paper, a novel composite material of the reduced graphene oxide nanosheets (rGON) with gold nanoparticles (NPs) (rGON-AuNP) is synthesized, and its morphology, structure, and composition are characterized by scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), energy dispersive X-ray (EDX), Fourier transform infrared spectroscopic (FTIR), Raman, and UV-Vis techniques. To confirm this material’s electrochemical activity, a glucose oxidase (GOD) is chosen as the target reagent to modify the rGON-AuNP layer to form GOD/rGON-AuNP/glassy carbon (GC) electrode. Two pairs of distinguishable redox peaks, corresponding to the redox processes of two different conformational GOD on AuNP, are observed on the cyclic voltammograms of GOD/rGON-AuNP/GC electrode. Both cyclic voltammetry and electrochemical impedance spectroscopy are employed to study the mechanism of direct electron transfer from GOD to GC electrode on the rGON-AuNP layer. In addition, this GOD/rGON-AuNP/GC electrode shows catalytic activity toward glucose oxidation reaction.

Reduced graphene oxide intercalated Co2C or Co4N nanoparticles as an efficient and durable fuel cell catalyst for oxygen reduction

2017 ◽  
Vol 5 (6) ◽  
pp. 2972-2980 ◽  
Author(s):  
Mayilvel Dinesh Meganathan ◽  
Shun Mao ◽  
Taizhong Huang ◽  
Guoxin Sun
Keyword(s):  
Graphene Oxide ◽  
Fuel Cells ◽  
Fuel Cell ◽  
Oxygen Reduction ◽  
Reduced Graphene Oxide ◽  
Alkaline Fuel Cells ◽  
Fuel Cell Catalyst ◽  
Reduced Graphene

Co2C or Co4N nanoparticles embedded on reduced graphene oxide are efficient and durable catalysts for oxygen reduction in alkaline fuel cells.

Nitrogen-doped reduced-graphene oxide as an efficient metal-free electrocatalyst for oxygen reduction in fuel cells

RSC Advances ◽  
2013 ◽  
Vol 3 (12) ◽  
pp. 3990 ◽  
Author(s):  
Zhen-Jiang Lu ◽  
Shu-Juan Bao ◽  
Yu-Ting Gou ◽  
Chang-Jun Cai ◽  
Chen-Chen Ji ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Fuel Cells ◽  
Oxygen Reduction ◽  
Reduced Graphene Oxide ◽  
Nitrogen Doped ◽  
Metal Free ◽  
Reduced Graphene

Reduced graphene oxide intercalated ZnS nanoparticles as an efficient and durable electrocatalyst for the oxygen reduction reaction

2018 ◽  
Vol 42 (23) ◽  
pp. 19285-19293 ◽  
Author(s):  
Zhankun Jiang ◽  
Jiemei Yu ◽  
Xianzhen Song ◽  
Wenjie Yang ◽  
Hengyi Fang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Fuel Cells ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduced Graphene Oxide ◽  
Reduction Reaction ◽  
Zns Nanoparticles ◽  
Reduced Graphene

The oxygen reduction reaction (ORR) is a key reaction for fuel cells and metal–air batteries.

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