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Ugartemendia A, Mercero JM, de Cózar A, Jimenez-Izal E. Does the Composition in PtGe Clusters Play any Role in Fighting CO Poisoning?. J Chem Phys 2022; 156:174301. [DOI: 10.1063/5.0089179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The high catalytic activity of Pt is accompanied by a high affinity for CO, making it extremely susceptible to poisoning. Such CO poisoning limits the use of proton exchange membrane fuel cells. In this work, using state-of-the-art global minima search techniques and exhaustive electronic structure characterization, the dopant concentration is pinpointed as a crucial factor to improve the CO tolerance of Pt catalysts. By investigating PtGe nanoclusters of different size and composition we found that, for those clusters with roughly the same amount of Pt and Ge, the binding to CO is weakened significantly. The uniqueness of the PtGe equimolar clusters is traced down to the electronic effects. The strong covalency and electrostatic stabilization arising from the advantageous Pt-Ge mixing, make the equimolar clusters highly resistant towards CO poisoning and therefore, more durable. Importantly, the novel catalysts are not only more resistant to deactivation, but they remain catalytically active towards hydrogen oxidation. Representative clusters are additionally deposited on graphene with a pentagon-octagon-pentagon (5-8-5) reconstructed divacancy. The remarkable results of free-standing clusters hold true for surface mounted clusters, in which the interaction with CO is dramatically weakened for those compounds with 1:1 Pt:Ge ratio. Our results demonstrate that Ge can be a promising alloying agent to mitigate the deactivation of Pt and that the dopant concentration is a critical factor in the design of advanced catalysts.
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Affiliation(s)
- Andoni Ugartemendia
- Polimero eta Material Aurreratuak: Fisika, Kimika eta Teknologia Saila, University of the Basque Country - Gipuzkoa Campus, Spain
| | - Jose M Mercero
- Kimika Fakultatea, Euskal Herriko Unibertsitatea (UPV/EHU), Spain
| | - Abel de Cózar
- Organic Chemistry I, University of the Basque Country - Gipuzkoa Campus, Spain
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Correlation between Precursor Properties and Performance in the Oxygen Reduction Reaction of Pt and Co “Core-shell” Carbon Nitride-Based Electrocatalysts. Electrocatalysis (N Y) 2019. [DOI: 10.1007/s12678-019-00569-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Chen Y, Liu X, Zhang S, Yang L, Liu M, Zhang Y, Yao S. Ultrasensitive and simultaneous detection of hydroquinone, catechol and resorcinol based on the electrochemical co-reduction prepared Au-Pd nanoflower/reduced graphene oxide nanocomposite. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.02.060] [Citation(s) in RCA: 120] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Ehteshami SMM, Chan SH. A review of electrocatalysts with enhanced CO tolerance and stability for polymer electrolyte membarane fuel cells. Electrochim Acta 2013. [DOI: 10.1016/j.electacta.2013.01.086] [Citation(s) in RCA: 117] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Pt–Ni carbon-supported catalysts for methanol oxidation prepared by Ni electroless deposition and its galvanic replacement by Pt. J Solid State Electrochem 2012. [DOI: 10.1007/s10008-012-1915-0] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Electrochemical instability of Pt nanoparticles probed by formic acid oxidation. J Electroanal Chem (Lausanne) 2012. [DOI: 10.1016/j.jelechem.2011.10.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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