Hierarchically structured catalyst layer for the oxygen reduction reaction fabricated by electrodeposition of platinum on carbon nanotube coated carbon fiber

RSC Advances ◽  
2015 ◽  
Vol 5 (82) ◽  
pp. 66518-66527 ◽  
Author(s):  
Raghunandan Sharma ◽  
Kamal K. Kar
Keyword(s):  
Active Catalyst ◽  
Catalyst Support ◽  
Catalyst Layer ◽  
Reduction Reaction ◽  
Pt Nanoparticle ◽  
Cathode Catalysts ◽  
Structured Catalyst ◽  
Nanoparticle Clusters ◽  
Fuel Cell Cathode ◽  
Coated Carbon

Hierarchically structured fuel cell cathode catalysts consisting of Pt-nanoparticle clusters coated on a CNT-based, ORR active catalyst support were synthesized.

scholarly journals Highly active atomically dispersed CoN4 fuel cell cathode catalysts derived from surfactant-assisted MOFs: carbon-shell confinement strategy

2019 ◽  
Vol 12 (1) ◽  
pp. 250-260 ◽  
Author(s):  
Yanghua He ◽  
Sooyeon Hwang ◽  
David A. Cullen ◽  
M. Aman Uddin ◽  
Lisa Langhorst ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Fuel Cell ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Platinum Group Metal ◽  
Reduction Reaction ◽  
Cathode Catalysts ◽  
Highly Active ◽  
Fuel Cell Cathode ◽  
Surfactant Assisted

Platinum group metal (PGM)-free catalysts for oxygen reduction reaction are essential for affordable fuel cells.

scholarly journals On the Correlation between the Oxygen in Hydrogen Content and the Catalytic Activity of Cathode Catalysts in PEM Water Electrolysis

2021 ◽  
Author(s):  
Agate Martin ◽  
Patrick Trinke ◽  
Chuyen Van Pham ◽  
Melanie Bühler ◽  
Markus Bierling ◽  
...  
Keyword(s):  
High Surface ◽  
Catalyst Layer ◽  
Linear Sweep Voltammetry ◽  
Water Electrolysis ◽  
Platinum Group Metal ◽  
Reduction Reaction ◽  
Ex Situ ◽  
Recombination Activity ◽  
Cathode Catalysts ◽  
Carbon Based

Abstract Altogether five platinum group metal (PGM) and PGM-free cathode catalysts were investigated in full PEM water electrolysis cells regarding their polarisation behaviour and their hydrogen and oxygen recombination properties. It was shown that the recombination activity of permeated oxygen and evolved hydrogen within the cathodic catalyst layer correlates with the activity of the oxygen reduction reaction (ORR) which was determined ex situ with linear sweep voltammetry. We found that the investigated PGM-free cathode catalysts had a low activity for the ORR resulting in higher measurable oxygen in hydrogen volume fractions compared to the PGM catalysts, which are more active for the ORR. Out of the three investigated PGM-free catalysts, only one commercially available material based on a Ti suboxide showed a similar good polarisation behaviour as the state of the art cathode catalyst platinum, while its recombination activity was the lowest of all catalysts. In addition to the recombination of hydrogen and oxygen on the electrocatalysts, we found that the prevalent carbon-based cathodic porous transport layers (PTL) also offer catalytically active recombination sites. In comparison to an inactive PTL, the measurable oxygen flux using carbon-based PTLs was lower and the recombination was enhanced by microporous coatings with high surface areas.

Nitrogen and phosphorus co-doped ultrathin carbon nanosheets as superior cathode catalysts of Zn-air battery.

2021 ◽  
Author(s):  
Aling Chen ◽  
Qingfeng Yi ◽  
Kuang Sheng ◽  
Yuebing Wang ◽  
Jiangchuan Chen ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Oxygen Reduction Reaction ◽  
Reduction Reaction ◽  
Nitrogen And Phosphorus ◽  
Carbon Nanosheets ◽  
Cathode Catalysts ◽  
Metal Free ◽  
Air Battery ◽  
Storage Technologies ◽  
Co Doped

Exploring efficient metal-free electrocatalyst for oxygen reduction reaction (ORR) plays a significant role in a variety of storage technologies and renewable energy conversion. In this work, we firstly compounded a...

Mitigation of PtCo/C Cathode Catalyst Degradation via Control of Relative Humidity

2021 ◽  
Author(s):  
Nagappan Ramaswamy ◽  
Swami Kumaraguru ◽  
Ratandeep Singh Kukreja ◽  
Daniel Groom ◽  
Karalee Jarvis ◽  
...  
Keyword(s):  
Relative Humidity ◽  
High Performance ◽  
Proton Exchange Membrane ◽  
Stress Test ◽  
Catalyst Layer ◽  
Reduction Reaction ◽  
Proton Exchange ◽  
Ex Situ ◽  
Primary Power ◽  
Ptco Alloy

Abstract Maintaining the high performance of proton-exchange membrane fuel cells (PEMFC) over the course of its lifetime is a key enabling factor for its successful commercialization as a primary power source in zero-emission transportation applications. In this context, it is important to mitigate the degradation of PtCo-alloy based cathode catalysts used for oxygen reduction reaction (ORR). PtCo-alloy catalysts exhibit high activity at beginning-of-life (BOL) which tends to decrease during operation due to loss of electrochemical surface area (ECSA) and dissolution-contamination related effects of the Co-alloying component. Here, we demonstrate the use of relative humidity (RH) of the inlet gases as a controllable parameter to mitigate the degradation of PtCo-alloy catalyst degradation. We employ a catalyst-specific voltage cycling accelerated stress test (AST) durability protocol as a function of inlet RH to degrade PtCo catalysts. A series of in situ electrochemical diagnostics and ex situ characterizations have been carried out to investigate the catalyst layer characteristics at end-of-test (EOT). Our results show that at sub-saturated conditions of durability protocol operation, PtCo catalyst sustains higher EOT H2/air performance due to better retention of ECSA and smaller impact of Co2+ dissolution/contamination.

Sign in / Sign up

Export Citation Format

Share Document