Preface—JES Focus Issue on Oxygen Reduction and Evolution Reactions for High Temperature Energy Conversion and Storage

2017 ◽  
Vol 164 (10) ◽  
pp. Y11-Y11 ◽  
Author(s):  
Sean R. Bishop ◽  
Xingbo Liu ◽  
Ainara Aguadero
Keyword(s):  
High Temperature ◽  
Energy Conversion ◽  
Oxygen Reduction ◽  
Energy Conversion And Storage ◽  
And Storage

A bi-functional catalyst for oxygen reduction and oxygen evolution reactions from used baby diapers: α-Fe2O3 wrapped in P and S dual doped graphitic carbon

RSC Advances ◽  
2016 ◽  
Vol 6 (69) ◽  
pp. 64258-64265 ◽  
Author(s):  
Hong Zhao ◽  
Jian Wang ◽  
Chi Chen ◽  
Dengjie Chen ◽  
Yang Gao ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Solid Waste ◽  
Oxygen Reduction ◽  
Oxygen Evolution ◽  
Environmental Sustainability ◽  
Graphitic Carbon ◽  
Storage Devices ◽  
Energy Conversion And Storage ◽  
And Storage

The development of energy conversion and storage devices and the disposal of solid waste represent two major challenges for environmental sustainability.

Biomass willow catkin-derived Co3O4/N-doped hollow hierarchical porous carbon microtubes as an effective tri-functional electrocatalyst

2017 ◽  
Vol 5 (38) ◽  
pp. 20170-20179 ◽  
Author(s):  
Bin Wang ◽  
Li Xu ◽  
Gaopeng Liu ◽  
Pengfei Zhang ◽  
Wenshuai Zhu ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Oxygen Reduction ◽  
Hydrogen Evolution ◽  
Oxygen Evolution ◽  
Porous Carbon ◽  
Electrochemical Reactions ◽  
Hierarchical Porous Carbon ◽  
Hierarchical Porous ◽  
Energy Conversion And Storage ◽  
And Storage

Oxygen reduction (ORR), oxygen evolution (OER), and hydrogen evolution (HER) reactions are extremely important electrochemical reactions for electrochemical energy conversion and storage.

scholarly journals Nanostructured Fe-N-C as Bifunctional Catalysts for Oxygen Reduction and Hydrogen Evolution

Catalysts ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1525
Author(s):  
Williane da Silva Freitas ◽  
Pedro Pablo Machado Pico ◽  
Alessandra D’Epifanio ◽  
Barbara Mecheri
Keyword(s):  
Energy Conversion ◽  
Oxygen Reduction ◽  
Hydrogen Evolution ◽  
Electrochemical Impedance ◽  
Carbon Matrix ◽  
Onset Potential ◽  
Storage Devices ◽  
Synthesis Strategy ◽  
Energy Conversion And Storage ◽  
And Storage

The development of electrocatalysts for energy conversion and storage devices is of paramount importance to promote sustainable development. Among the different families of materials, catalysts based on transition metals supported on a nitrogen-containing carbon matrix have been found to be effective catalysts toward oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) with high potential to replace conventional precious metal-based catalysts. In this work, we developed a facile synthesis strategy to obtain a Fe-N-C bifunctional ORR/HER catalysts, involving wet impregnation and pyrolysis steps. Iron (II) acetate and imidazole were used as iron and nitrogen sources, respectively, and functionalized carbon black pearls were used as conductive support. The bifunctional performance of the Fe-N-C catalyst toward ORR and HER was investigated by cyclic voltammetry, rotating ring disk electrode experiments, and electrochemical impedance spectroscopy in alkaline environment. ORR onset potential and half-wave potential were 0.95 V and 0.86 V, respectively, indicating a competitive performance in comparison with the commercial platinum-based catalyst. In addition, Fe-N-C had also a good HER activity, with an overpotential of 478 mV @10 mAcm−2 and Tafel slope of 133 mVdec−1, demonstrating its activity as bifunctional catalyst in energy conversion and storage devices, such as alkaline microbial fuel cell and microbial electrolysis cells.

scholarly journals Gelatin-derived sustainable carbon-based functional materials for energy conversion and storage with controllability of structure and component

2015 ◽  
Vol 1 (1) ◽  
pp. e1400035 ◽  
Author(s):  
Zhong-Li Wang ◽  
Dan Xu ◽  
Hai-Xia Zhong ◽  
Jun Wang ◽  
Fan-Lu Meng ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Oxygen Reduction ◽  
Active Sites ◽  
Rate Capability ◽  
Functional Materials ◽  
Synthetic Approach ◽  
Lithium Storage ◽  
Energy Conversion And Storage ◽  
And Storage ◽  
Carbon Based

Nonprecious carbon catalysts and electrodes are vital components in energy conversion and storage systems. Despite recent progress, controllable synthesis of carbon functional materials is still a great challenge. We report a novel strategy to prepare simultaneously Fe-N-C catalysts and Fe3O4/N-doped carbon hybrids based on the sol-gel chemistry of gelatin and iron with controllability of structure and component. The catalysts demonstrate higher catalytic activity and better durability for oxygen reduction than precious Pt/C catalysts. The active sites of FeN4/C (D1) and N-FeN2+2/C (D3) are identified by Mössbauer spectroscopy, and most of the Fe ions are converted into D1 or D3 species. The oxygen reduction reaction (ORR) activity correlates well with the surface area, porosity, and the content of active Fe-Nx /C (D1 + D3) species. As an anode material for lithium storage, Fe3O4/carbon hybrids exhibit superior rate capability and excellent cycling performance. The synthetic approach and the proposed mechanism open new avenues for the development of sustainable carbon-based functional materials.

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