A newly-designed sandwich-structured graphene–Pt–graphene catalyst with improved electrocatalytic performance for fuel cells

2015 ◽  
Vol 3 (10) ◽  
pp. 5313-5320 ◽  
Author(s):  
Lei Zhao ◽  
Zhen-Bo Wang ◽  
Jia-Long Li ◽  
Jing-Jia Zhang ◽  
Xu-Lei Sui ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Synthesis Method ◽  
Facile Synthesis ◽  
Electrocatalytic Performance ◽  
Electro Oxidation ◽  
The Stability

A novel sandwich-structured G–P–G catalyst prepared by a simple, facile synthesis method exhibits 1.27 times higher activity for methanol electro-oxidation than that of Pt/graphene and the stability is improved by 70% as compared with Pt/graphene.

Facile synthesis of high-quality Pt nanostructures with a controlled aspect ratio for methanol electro-oxidation

CrystEngComm ◽  
2014 ◽  
Vol 16 (36) ◽  
pp. 8340-8343 ◽  
Author(s):  
Yi Li ◽  
Ting Bian ◽  
Jingshan Du ◽  
Yalin Xiong ◽  
Fangwei Zhan ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Methanol Oxidation ◽  
Facile Synthesis ◽  
High Quality ◽  
Aspect Ratios ◽  
Electrocatalytic Performance ◽  
Electro Oxidation

Pt nanobars with different aspect ratios were synthesized and exhibited remarkably excellent electrocatalytic performance for methanol oxidation.

scholarly journals Bifunctional Pt-IrO2 Catalysts for the Oxygen Evolution and Oxygen Reduction Reactions: Alloy Nanoparticles vs. Nanocomposite Catalysts

2020 ◽  
Author(s):  
Jia Du ◽  
Jonathan Quinson ◽  
Daming Zhang ◽  
Francesco Bizzotto ◽  
Alessandro Zana ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Oxygen Reduction ◽  
Oxygen Evolution ◽  
Carbon Support ◽  
Reduction Reaction ◽  
Alloy Nanoparticles ◽  
Electrocatalytic Performance ◽  
Before And After ◽  
Nanocomposite Catalysts ◽  
The Stability

<p>In the present study different concepts for the development of bifunctional oxygen reduction reaction / oxygen evolution reaction (ORR / OER) electrocatalysts are explored and compared. Bifunctional ORR / OER catalysts are often suggested to improve the stability during startup and shutdown of fuel cells. Furthermore, they are proposed for so-called unitized regenerative fuel cells (URFCs) that would allow a closed loop system to use and produce hydrogen on demand. We compare the electrocatalytic performance of conventional Pt<sub>x</sub>Ir<sub>y</sub> alloy nanoparticles (NPs) with Pt – IrO<sub>2</sub> NP composites (nanocomposites), both immobilized onto a commercial carbon support. The Pt – IrO<sub>2</sub> nanocomposites thereby consist of a mixture of Pt NPs and IrO<sub>2</sub> NPs. By probing the electrocatalytic performance before and after exposing the electrocatalysts to accelerated degradation tests (ADTs) it is shown that the Pt – IrO<sub>2</sub> nanocomposite concept offers advantages but also some disadvantages over the conventional alloy concept. In particular it is shown that while the nanocomposites are initially less active for the ORR due to an interparticle effect, their performance is less affected by the ADTs. However, all tested catalysts experience a decline of the Ir / Pt ratio upon the ADTs treatment, highlighting the challenging stability requirements for URFCs.</p>

scholarly journals Bifunctional Pt-IrO2 Catalysts for the Oxygen Evolution and Oxygen Reduction Reactions: Alloy Nanoparticles vs. Nanocomposite Catalysts

2020 ◽  
Author(s):  
Jia Du ◽  
Jonathan Quinson ◽  
Daming Zhang ◽  
Francesco Bizzotto ◽  
Alessandro Zana ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Oxygen Reduction ◽  
Oxygen Evolution ◽  
Carbon Support ◽  
Reduction Reaction ◽  
Alloy Nanoparticles ◽  
Electrocatalytic Performance ◽  
Before And After ◽  
Nanocomposite Catalysts ◽  
The Stability

<p>In the present study different concepts for the development of bifunctional oxygen reduction reaction / oxygen evolution reaction (ORR / OER) electrocatalysts are explored and compared. Bifunctional ORR / OER catalysts are often suggested to improve the stability during startup and shutdown of fuel cells. Furthermore, they are proposed for so-called unitized regenerative fuel cells (URFCs) that would allow a closed loop system to use and produce hydrogen on demand. We compare the electrocatalytic performance of conventional Pt<sub>x</sub>Ir<sub>y</sub> alloy nanoparticles (NPs) with Pt – IrO<sub>2</sub> NP composites (nanocomposites), both immobilized onto a commercial carbon support. The Pt – IrO<sub>2</sub> nanocomposites thereby consist of a mixture of Pt NPs and IrO<sub>2</sub> NPs. By probing the electrocatalytic performance before and after exposing the electrocatalysts to accelerated degradation tests (ADTs) it is shown that the Pt – IrO<sub>2</sub> nanocomposite concept offers advantages but also some disadvantages over the conventional alloy concept. In particular it is shown that while the nanocomposites are initially less active for the ORR due to an interparticle effect, their performance is less affected by the ADTs. However, all tested catalysts experience a decline of the Ir / Pt ratio upon the ADTs treatment, highlighting the challenging stability requirements for URFCs.</p>

scholarly journals Bifunctional Pt-IrO2 Catalysts for the Oxygen Evolution and Oxygen Reduction Reactions: Alloy Nanoparticles vs. Nanocomposite Catalysts

2020 ◽  
Author(s):  
Jia Du ◽  
Jonathan Quinson ◽  
Daming Zhang ◽  
Francesco Bizzotto ◽  
Alessandro Zana ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Oxygen Reduction ◽  
Oxygen Evolution ◽  
Carbon Support ◽  
Reduction Reaction ◽  
Alloy Nanoparticles ◽  
Electrocatalytic Performance ◽  
Before And After ◽  
Nanocomposite Catalysts ◽  
The Stability

<p>In the present study different concepts for the development of bifunctional oxygen reduction reaction / oxygen evolution reaction (ORR / OER) electrocatalysts are explored and compared. Bifunctional ORR / OER catalysts are often suggested to improve the stability during startup and shutdown of fuel cells. Furthermore, they are proposed for so-called unitized regenerative fuel cells (URFCs) that would allow a closed loop system to use and produce hydrogen on demand. We compare the electrocatalytic performance of conventional Pt<sub>x</sub>Ir<sub>y</sub> alloy nanoparticles (NPs) with Pt – IrO<sub>2</sub> NP composites (nanocomposites), both immobilized onto a commercial carbon support. The Pt – IrO<sub>2</sub> nanocomposites thereby consist of a mixture of Pt NPs and IrO<sub>2</sub> NPs. By probing the electrocatalytic performance before and after exposing the electrocatalysts to accelerated degradation tests (ADTs) it is shown that the Pt – IrO<sub>2</sub> nanocomposite concept offers advantages but also some disadvantages over the conventional alloy concept. In particular it is shown that while the nanocomposites are initially less active for the ORR due to an interparticle effect, their performance is less affected by the ADTs. However, all tested catalysts experience a decline of the Ir / Pt ratio upon the ADTs treatment, highlighting the challenging stability requirements for URFCs.</p>

COx-free hydrogen production via ammonia decomposition over mesoporous Co/Al2O3 catalysts with highly dispersed Co species synthesized by a facile method

2021 ◽  
Author(s):  
Yingqiu Gu ◽  
Di Xu ◽  
Yun Huang ◽  
Zhouyang Long ◽  
Guojian Chen
Keyword(s):  
Fuel Cells ◽  
Hydrogen Production ◽  
Transition Metal ◽  
Transition Metals ◽  
Ammonia Decomposition ◽  
Metal Catalyst ◽  
Facile Synthesis ◽  
Transition Metal Catalyst ◽  
Highly Dispersed ◽  
Free Hydrogen

Transition metals have been considered as potential catalysts for ammonia decomposition to produce COx-free hydrogen for fuel cells. However, the facile synthesis of transition metal catalyst with small size active...

Exploring the Stability of Direct Ethanol Solid Oxide Fuel Cells at Intermediate Temperature

2021 ◽  
Vol 103 (1) ◽  
pp. 169-178
Author(s):  
Fabio Coral Fonseca ◽  
Francisco Tabuti ◽  
Tamara Moraes ◽  
Ricardo Abe ◽  
Rafael Mariz Guimarães ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Intermediate Temperature ◽  
Oxide Fuel ◽  
The Stability

scholarly journals Facile synthesis of Ni-decorated multi-layers graphene sheets as effective anode for direct urea fuel cells

2017 ◽  
Vol 10 (6) ◽  
pp. 811-822 ◽  
Author(s):  
Ahmed Yousef ◽  
Mohamed H. El-Newehy ◽  
Salem S. Al-Deyab ◽  
Nasser A.M. Barakat
Keyword(s):  
Fuel Cells ◽  
Graphene Sheets ◽  
Facile Synthesis
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