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.

scholarly journals Carbon-based electrocatalysts for advanced energy conversion and storage

2015 ◽  
Vol 1 (7) ◽  
pp. e1500564 ◽  
Author(s):  
Jintao Zhang ◽  
Zhenhai Xia ◽  
Liming Dai
Keyword(s):  
Fuel Cells ◽  
Energy Conversion ◽  
Carbon Nanomaterials ◽  
Surface Characteristics ◽  
Reduction Reaction ◽  
Practical Significance ◽  
Metal Free ◽  
Energy Conversion And Storage ◽  
And Storage ◽  
Carbon Based

Oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) play curial roles in electrochemical energy conversion and storage, including fuel cells and metal-air batteries. Having rich multidimensional nanoarchitectures [for example, zero-dimensional (0D) fullerenes, 1D carbon nanotubes, 2D graphene, and 3D graphite] with tunable electronic and surface characteristics, various carbon nanomaterials have been demonstrated to act as efficient metal-free electrocatalysts for ORR and OER in fuel cells and batteries. We present a critical review on the recent advances in carbon-based metal-free catalysts for fuel cells and metal-air batteries, and discuss the perspectives and challenges in this rapidly developing field of practical significance.

scholarly journals Aggregate-State Effects in the Atomistic Modeling of Organic Materials for Electrochemical Energy Conversion and Storage Devices: A Perspective

Molecules ◽  
2020 ◽  
Vol 25 (9) ◽  
pp. 2233 ◽  
Author(s):  
Sergei Manzhos
Keyword(s):  
Energy Conversion ◽  
Charge Transport ◽  
Electrode Materials ◽  
Organic Materials ◽  
Optoelectronic Devices ◽  
Functional Materials ◽  
Aggregate State ◽  
Energy Conversion And Storage ◽  
Organic Batteries ◽  
And Storage

Development of new functional materials for novel energy conversion and storage technologies is often assisted by ab initio modeling. Specifically, for organic materials, such as electron and hole transport materials for perovskite solar cells, LED (light emitting diodes) emitters for organic LEDs (OLEDs), and active electrode materials for organic batteries, such modeling is often done at the molecular level. Modeling of aggregate-state effects is onerous, as packing may not be known or large simulation cells may be required for amorphous materials. Yet aggregate-state effects are essential to estimate charge transport rates, and they may also have substantial effects on redox potentials (voltages) and optical properties. This paper summarizes recent studies by the author’s group of aggregation effects on the electronic properties of organic materials used in optoelectronic devices and in organic batteries. We show that in some cases it is possible to understand the mechanism and predict specific performance characteristics based on simple molecular models, while in other cases the inclusion of effects of aggregation is essential. For example, it is possible to understand the mechanism and predict the overall shape of the voltage-capacity curve for insertion-type organic battery materials, but not the absolute voltage. On the other hand, oligomeric models of p-type organic electrode materials can allow for relatively reliable estimates of voltages. Inclusion of aggregate state modeling is critically important for estimating charge transport rates in materials and interfaces used in optoelectronic devices or when intermolecular charge transfer bands are important. We highlight the use of the semi-empirical DFTB (density functional tight binding) method to simplify such calculations.

Advanced functional materials and devices for energy conversion and storage applications

2022 ◽  
pp. 43-96
Author(s):  
Anirban Maitra ◽  
Sumanta Bera ◽  
Lopamudra Halder ◽  
Bhanu Bhusan Khatua
Keyword(s):  
Energy Conversion ◽  
Functional Materials ◽  
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.

From Carbon-Based Nanotubes to Nanocages for Advanced Energy Conversion and Storage

2017 ◽  
Vol 50 (2) ◽  
pp. 435-444 ◽  
Author(s):  
Qiang Wu ◽  
Lijun Yang ◽  
Xizhang Wang ◽  
Zheng Hu
Keyword(s):  
Energy Conversion ◽  
Energy Conversion And Storage ◽  
And Storage ◽  
Carbon Based
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