Physical vapor deposition process for engineering Pt based oxygen reduction reaction catalysts on NbOx templated carbon support

Xu, Chunchuan; Yang, Jun; Liu, Ershuai; Jia, Qingying; Veith, Gabriel M.; Nair, Gokul S.; DiPietro, Stephen; Sun, Kai; Chen, Jixin; Pietrasz, Patrick; Lu, Zijie; Jagner, Mark; Gath, Kerrie; Mukerjee, Sanjeev; Waldecker, James

doi:10.1016/j.jpowsour.2020.227709

Cited by 28 publications

(18 citation statements)

References 31 publications

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“…Consequently, a low Pt coordination number and a contraction in Pt−Pt bond (strain effect) could be expected that serve in favor to the performance enhancement. In a saturated form of niobium oxide, the 2p orbital is filled with electrons that are supplied from Nb, which causes a less charge exchange with Pt . This scenario would be different if the niobium oxide is in a reduced form where the 2p orbital of O is not fully filled.…”

Section: Resultsmentioning

confidence: 99%

Dense Niobium Oxide Coating on Carbon Black as a Support to Platinum Electrocatalyst for Oxygen Reduction

Jasim

Al‐Salihi

et al. 2020

ChemistrySelect

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Carbon black (CB) is commonly used to support Pt as an electrocatalyst in fuel cells. However, it is easily corroded in electrochemical reactions, such as in the oxygen reduction reaction (ORR), leading to catalyst degradation. In this paper, we report results of protecting the CB using an ultrathin 5 nm film of niobium oxide conformally coated on the CB using a new coating technique. Electrochemical test in ORR shows only a 1.7 % activity loss after 5000 cycles, demonstrating an excellent durability of the electrocatalyst. Compared to the electrocatalyst without niobium oxide coating, it shows a 25 mV improvement in half-wave potentials, indicative of a better kinetics. A positive shift in binding energy was found in Pt 4 f, implying electron delocalization has occurred when Pt is interfaced with the niobium oxide support. The activity enhancement is attributed to the electronic structure change in the electrocatalyst as a result of metal-support interactions.

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Section: Resultsmentioning

confidence: 99%

Dense Niobium Oxide Coating on Carbon Black as a Support to Platinum Electrocatalyst for Oxygen Reduction

Jasim

Al‐Salihi

et al. 2020

ChemistrySelect

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“…Another strategy to increase the support stability is by incorporating metal oxide as catalyst supports. For this reason, a wide variety of options for novel Pt supported with metal oxides, such as NbOx [236], In 2 O 3 [237] , and TiO 2 [238] , have been explored. However, those kinds of metal oxide materials have poor conductivity, which makes it necessary to develop different strategies to increase conductivity, such as:…”

Section: Oxygen Reduction Catalystsmentioning

confidence: 99%

“…Adding carbon-based materials like CNT [232], C [236], or graphene nanoribbons [238]; • Alloying of Pt with other metals, such as In [237]; • Incorporating some nitride compounds, such as TiN [239].…”

mentioning

confidence: 99%

Proton Exchange Membrane Fuel Cells (PEMFCs): Advances and Challenges

Tellez-Cruz¹,

et al. 2021

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The study of the electrochemical catalyst conversion of renewable electricity and carbon oxides into chemical fuels attracts a great deal of attention by different researchers. The main role of this process is in mitigating the worldwide energy crisis through a closed technological carbon cycle, where chemical fuels, such as hydrogen, are stored and reconverted to electricity via electrochemical reaction processes in fuel cells. The scientific community focuses its efforts on the development of high-performance polymeric membranes together with nanomaterials with high catalytic activity and stability in order to reduce the platinum group metal applied as a cathode to build stacks of proton exchange membrane fuel cells (PEMFCs) to work at low and moderate temperatures. The design of new conductive membranes and nanoparticles (NPs) whose morphology directly affects their catalytic properties is of utmost importance. Nanoparticle morphologies, like cubes, octahedrons, icosahedrons, bipyramids, plates, and polyhedrons, among others, are widely studied for catalysis applications. The recent progress around the high catalytic activity has focused on the stabilizing agents and their potential impact on nanomaterial synthesis to induce changes in the morphology of NPs.

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“…The enhanced ORR activity is derived from structural defects, compressive strain of Pt nanoparticles, and strong interactions between deposited Pt nanoparticles/single atoms and carbon defects generated in plasma processing. In the work of Xu et al, the arc plasma deposition process is investigated to prepare Pt‐based ORR catalysts on NbO x templated carbon support 171 . The strain effect from the PtO interactions improves the durability and mass activity of the catalysts.…”

Section: Recent Advances Of Plasma‐modified Electrocatalystsmentioning

confidence: 99%

Plasma modified and tailored defective electrocatalysts for water electrolysis and hydrogen fuel cells

Luo

Huang

et al. 2022

EcoMat

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Carbon dioxide generated by the combustion of fossil fuels exacerbates global environmental problems and hydrogen produced by renewable energy is a viable alternative in the continuous transition to sustainable and eco‐conscience development. Electrocatalysts are vital to electrocatalytic reactions and plasma surface modification is one of the promising techniques to modify nanoscale electrocatalysts for water splitting. Up to now, a comprehensive review on the latest developments, challenges, and opportunities of plasma‐tailored defective electrocatalysts for water electrolysis and hydrogen fuel cells is lacking. This paper systematically summarizes the current status of hydrogen production and fuel cell technologies, plasma principles and advantages, plasma‐tailored defective electrocatalysts from the perspective of water splitting and fuel cell applications, advanced characterization of defects, relationship between materials structure and catalytic activity of electrocatalysts, and finally challenges, opportunities, and future roadmap of plasma technologies. This review serves as a reference for future development of hydrogen technologies and offers insights into the structural tailoring of catalytic materials.

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Physical vapor deposition process for engineering Pt based oxygen reduction reaction catalysts on NbOx templated carbon support

Cited by 28 publications

References 31 publications

Dense Niobium Oxide Coating on Carbon Black as a Support to Platinum Electrocatalyst for Oxygen Reduction

Dense Niobium Oxide Coating on Carbon Black as a Support to Platinum Electrocatalyst for Oxygen Reduction

Proton Exchange Membrane Fuel Cells (PEMFCs): Advances and Challenges

Plasma modified and tailored defective electrocatalysts for water electrolysis and hydrogen fuel cells

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