Effect of airbrush type on sprayed platinum and platinum-cobalt catalyst inks: Benchmarking as PEMFC and performance in an electrochemical hydrogen pump

Arenas, Luis F.; Hadjigeorgiou, Georgios M.; Jones, Simon C.; Dijk, Nick van; Hodgson, David; Cruden, Andy; León, Carlos Ponce de

doi:10.1016/j.ijhydene.2020.06.292

Cited by 24 publications

(11 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Notably, this same implementation of pore formers in the formulation of catalyst inks sprayed by hand (with an airbrush) has been adopted by others 36,37,44 and relies on the use of airbrushes in which a negative pressure is created when air is flown around the nozzle, drawing ink from the reservoir and forming fine droplets. 48 However, the time-demanding spraying process (typically requiring tens of minutes) entails a progressive settling of the solids in the ink that alters the composition of the sprayed material over time, likely leading to inhomogeneities that can result in poor CL performance. We hypothesize that this solid-settling issue may be slowed down by the presence of the above pore formers, explaining the improvements reported upon their implementation (but still not making it possible to get rid of the handler-dependent reproducibility issues unveiled in Figure 1).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Up-Scaled Preparation of Pt–Ni Aerogel Catalyst Layers for Polymer Electrolyte Fuel Cell Cathodes

Fikry,

Weiß,

Bozzetti

et al. 2024

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

High activity and durability are two key requirements for the successful development of Pt-based ORR catalyst layers for polymer electrolyte fuel cell (PEFC) cathodes. Unsupported Pt−Ni aerogels consisting of an interconnected nanoparticle network have been shown to fulfill these two requirements, but in our previous work, their processing into high-performing catalyst layers (CLs) required the inclusion of a pore inducer and the preparation of catalyst-coated membranes (CCMs) through hand spraying. Since the results of the latter approach are highly dependent on the operator and therefore prone to irreproducibility, in this work, we attempted to use an automated spray coating machine to reproducibly manufacture aerogel CCMs. This required scaling up the aerogel synthesis (yielding 5-fold more material than in previous works), which was shown to yield a material with physicochemical properties similar to those of the aerogels made through the standard approach. Most importantly, the subsequent optimization of the catalyst ink formulation and processing methods resulted in homogeneous and high-performance CLs without the use of a pore inducer. Thus, this work represents an important step toward the up-scaling of such materials' synthesis in the (multi)gram scale and their subsequent implementation in real devices.

show abstract

Section: ■ Results and Discussionmentioning

confidence: 99%

Up-Scaled Preparation of Pt–Ni Aerogel Catalyst Layers for Polymer Electrolyte Fuel Cell Cathodes

Fikry,

Weiß,

Bozzetti

et al. 2024

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

show abstract

“…Catalytic hydrogenation based on transition metal catalysts is of great significance in both laboratory and industry and has been widely developed [ 1 , 2 ]. Typically, the hydrogenation products of arylamines (from nitroaromatics) and aralkyls (from aryl olefins) are all the critical intermediate compounds in fine chemicals, and have a wide range of applications in pharmaceutical, chemical, petroleum, cosmetic, and other fields [ 3 , 4 ].…”

Section: Introductionmentioning

confidence: 99%

“…To improve the chemoselectivity, various attempts have been conducted, such as changing the hydrogen source, selecting different nano-metal catalysts, constructing alloy catalysts, designing the structure of catalyst supports, etc. [ 1 , 2 , 3 , 4 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Biomass Derived Pt-Ni Bimetallic Catalyst and Its Selective Hydrogenation for 4-Nitrostyrene

et al. 2022

View full text Add to dashboard Cite

The hydrogenation products of aromatic molecules with reducible groups (such as C=C, NO2, C=O, etc.) are relatively critical intermediate compounds in fine chemicals, but how to accurately reduce only specific groups is still challenging. In this work, a bimetallic Pt-Ni/Chitin catalyst was prepared for the first time by using renewable biomass resource chitin as support. As the carrier, the chitin was constructed into porous nanofibrous microspheres through the sol-gel strategy, which was favorable for the adhesion of nano-metals and the exchange of reactive substances due to its large surface area, porous structure, and rich functional groups. Then the Pt-Ni/Chitin catalyst was applied to selective hydrogenation with the model substrate of 4-nitrostyrene. As the highly dispersed Pt-Ni NPs with abundant exposed active sites and the synergistic effect of bimetals, the Pt-Ni/Chitin catalyst could efficiently and selectively hydrogenate only NO2 or C=C with yields of ~99% and TOF of 660 h−1, as well as good stability. This utilization of biomass resources to build catalyst materials would be important for the green and sustainable chemistry.

show abstract

“…Regarding the operation of the HP, the aforementioned HOR takes place at the anode, while the hydrogen evolution reaction (HER) occurs at the cathode, where the theoretical standard cell potential is 0.0 V vs. SHE, dominating the resistive behavior of the membrane instead of the activation and ohmic overpotential during the HP operation [20]. Nevertheless, there is essentially an affordable low-activation-energy anodic catalyst.…”

Section: Introductionmentioning

confidence: 99%

Ultra-Low Pt Loading in PtCo Catalysts for the Hydrogen Oxidation Reaction: What Role Do Co Nanoparticles Play?

et al. 2021

View full text Add to dashboard Cite

The effect of the nature of the catalyst on the performance and mechanism of the hydrogen oxidation reaction (HOR) is discussed for the first time in this work. HOR is an anodic reaction that takes place in anionic exchange membrane fuel cells (AEMFCs) and hydrogen pumps (HPs). Among the investigated catalysts, Pt exhibited the best performance in the HOR. However, the cost and the availability limit the usage. Co is incorporated as a co-catalyst due to its oxophylic nature. Five different PtCo catalysts with different Pt loading values were synthesized in order to decrease Pt loading. The catalytic activities and the reaction mechanism were studied via electrochemical techniques, and it was found that both features are a function of Pt loading; low-Pt-loading catalysts (Pt loading < 2.7%) led to a high half-wave potential in the hydrogen oxidation reaction, which is related to higher activation energy and an intermediate Tafel slope value, related to a mixed HOR mechanism. However, catalysts with moderate Pt loading (Pt loading > 3.1%) exhibited lower E1/2 than the other catalysts and exhibited a mechanism similar to that of commercial Pt catalysts. Our results demonstrate that Co plays an active role in the HOR, facilitating Hads desorption, which is the rate-determining step (RDS) in the mechanism of the HOR.

show abstract

Effect of airbrush type on sprayed platinum and platinum-cobalt catalyst inks: Benchmarking as PEMFC and performance in an electrochemical hydrogen pump

Cited by 24 publications

References 42 publications

Up-Scaled Preparation of Pt–Ni Aerogel Catalyst Layers for Polymer Electrolyte Fuel Cell Cathodes

Up-Scaled Preparation of Pt–Ni Aerogel Catalyst Layers for Polymer Electrolyte Fuel Cell Cathodes

Fabrication of Biomass Derived Pt-Ni Bimetallic Catalyst and Its Selective Hydrogenation for 4-Nitrostyrene

Ultra-Low Pt Loading in PtCo Catalysts for the Hydrogen Oxidation Reaction: What Role Do Co Nanoparticles Play?

Contact Info

Product

Resources

About