Peptide templated Au@Pd core-shell structures as efficient bi-functional electrocatalysts for both oxygen reduction and hydrogen evolution reactions

Zong, Zhuo; Xu, Kebin; Li, Dongliang; Tang, Zhenghua; He, Wei; Liu, Zhen; Wang, Xiufang; Tian, Yong

doi:10.1016/j.jcat.2018.02.020

Cited by 70 publications

(32 citation statements)

References 58 publications

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“…Furthermore, all of the slope values are quite close with Pd/C, implying that a similar reaction mechanism was adopted for all of the samples. Such close Tafel slope values with Pd/C suggest that the rate-dominant step is probably the first-electron transfer to oxygen molecule, while the following reduction and the breaking of the O-O bond are relatively fast [48][49][50]. The above findings further confirm that Pd 50 Ru 50 /CNs exhibited slightly superior ORR activity than that of commercial Pd/C.…”

Section: Orr Performancesupporting

confidence: 65%

“…The positive binding energy shift of the Pd3d electrons in Pd 50 Ru 50 /CNs indicates that there is electron transfer occurring from the Pd atoms to the Ru atoms. Previous investigations have shown that such an electron transfer could facilitate the electrocatalytic reaction kinetics, and can therefore significantly enhance the catalytic activity [47][48][49]. The high-resolution XPS spectra of the Pd3d and Ru3d electrons of the other samples in the series are presented in Figure S6a,b, respectively.…”

Section: X-ray Diffraction (Xrd) and Xps Analysismentioning

confidence: 96%

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Oxygen Reduction Reaction and Hydrogen Evolution Reaction Catalyzed by Pd–Ru Nanoparticles Encapsulated in Porous Carbon Nanosheets

Tian

Tang

et al. 2018

Catalysts

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Developing bi-functional electrocatalysts for both oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) is crucial for enhancing the energy transfer efficiency of metal-air batteries and fuel cells, as well as producing hydrogen with a high purity. Herein, a series of Pd-Ru alloyed nanoparticles encapsulated in porous carbon nanosheets (CNs) were synthesized and employed as a bifunctional electrocatalyst for both ORR and HER. The TEM measurements showed that Pd-Ru nanoparticles, with a size of approximately 1-5 nm, were uniformly dispersed on the carbon nanosheets. The crystal and electronic structures of the Pd x Ru 100−x /CNs series were revealed by powder X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The as-prepared samples exhibited effective ORR activity in alkaline media and excellent HER activity in both alkaline and acid solutions. The Pd 50 Ru 50 /CNs sample displayed the best activity and stability among the series, which is comparable and superior to that of commercial 10% Pd/C. For ORR, the Pd 50 Ru 50 /CNs catalyst exhibited an onset potential of 0.903 V vs. RHE (Reversible Hydrogen Electrode) and 11.4% decrease of the current density after 30,000 s of continuous operation in stability test. For HER, the Pd 50 Ru 50 /CNs catalyst displayed an overpotential of 37.3 mV and 45.1 mV at 10 mA cm −2 in 0.1 M KOH and 0.5 M H 2 SO 4 , respectively. The strategy for encapsulating bimetallic alloys within porous carbon materials is promising for fabricating sustainable energy toward electrocatalysts with multiple electrocatalytic activities for energy related applications.

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Section: Orr Performancesupporting

confidence: 65%

Section: X-ray Diffraction (Xrd) and Xps Analysismentioning

confidence: 96%

Oxygen Reduction Reaction and Hydrogen Evolution Reaction Catalyzed by Pd–Ru Nanoparticles Encapsulated in Porous Carbon Nanosheets

Tian

Tang

et al. 2018

Catalysts

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“…It also implies that a similar reaction mechanism was followed by both the ECs. This is because earlier studies exclusively reported that when Pt/C is used as an EC, the rate-determining step is the first electron transfer to oxygen molecules. ,, …”

Section: Resultsmentioning

confidence: 99%

“…This is because earlier studies exclusively reported that when Pt/C is used as an EC, the ratedetermining step is the first electron transfer to oxygen molecules. 23,60,61 Chronoamperometry (CA) and accelerated durability test (ADT) are two other critical parameters to check the longterm stability and durability of an EC for practical applications. Figure 6a presents the CA responses of the CuO x −CeO 2 /C EC and Pt/C.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Elucidating the Role of Oxide–Oxide/Carbon Interfaces of CuO_x–CeO₂/C in Boosting Electrocatalytic Performance

et al. 2020

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Herein, we report the synthesis and bifunctional oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) activities of a CuO x −CeO 2 /C electrocatalyst (EC) with rich oxide−oxide and oxide−carbon interfaces. It not only demonstrates a smaller Tafel slope (65 mV dec −1 ) and higher limiting current density (−5.03 mA cm −2 ) but also exhibits an onset potential (−0.10 V vs Ag/AgCl) comparable to that of benchmark Pt/C. Besides undergoing the favorable direct four-electron ORR pathway, it unveils a loss of 23% of its initial current after 6 h of a stability test and a negative shift of 4 mV in the half-wave potential after the accelerated durability test compared to the corresponding current loss of 28% and negative shift of 20 mV for Pt/C. It also reveals remarkable OER activity in an alkaline medium with a low onset potential (0.20 V) and a smaller Tafel slope (177 mV dec −1 ). The bifunctional ORR/OER activity of CuO x −CeO 2 /C EC can be ascribed to the synergistic effects, its unique structure with enriched oxygen vacancies owing to the presence of Ce 4+ /Ce 3+ , robust oxide−oxide and oxide−carbon heterointerfaces, and homogeneous dispersion of oxides over the carbon bed, which facilitates faster electronic conduction.

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“…In recent years, biological scaffolds including peptides, , proteins, , nucleic acids, , and bacteriophages , are emerging as attractive supports for nanomaterial nucleation and growth into well-defined structures. Compared to conventional chemical synthetic routes, these biobased methods hold some key advantages: − (1) eco-friendly synthetic conditions without the use of non-natural surfactants, organic solvents, and elevated temperature; (2) large diversity of structures to organize nanoparticles into different morphologies such as wires, rings, networks, etc.…”

Section: Introductionmentioning

confidence: 99%

Tunable Assembly of Protein Enables Fabrication of Platinum Nanostructures with Different Catalytic Activity

Pan

Blum

Mauzeroll

2021

ACS Appl. Mater. Interfaces

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Proteins are promising biofunctional units for the construction of nanomaterials (NMs) due to their abundant binding sites, intriguing self-assembly properties, and mild NM synthetic conditions. Tobacco mosaic virus coat protein (TMVCP) is a protein capable of self-assembly into distinct morphologies depending on the solution pH and ionic strength. Herein, we report the use of TMVCP as a building block to organize nanosized platinum into discrete nanorings and isolated nanoparticles by varying the solution pH to modulate the protein assembly state. Compared with a commercial Pt/C catalyst, the TMVCPtemplated platinum materials exhibited significant promotion of the catalytic activity and stability toward methanol electrooxidation in both neutral and alkaline conditions. The enhanced catalytic performance is likely facilitated by the protein support. Additionally, Pt nanorings outperformed isolated nanoparticles, although they are both synthesized on TMVCP templates. This could be due to the higher mechanical stability of the protein disk structure and possible cooperative effects between adjacent nanoparticles in the ring with narrow interparticle spacing.

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Peptide templated Au@Pd core-shell structures as efficient bi-functional electrocatalysts for both oxygen reduction and hydrogen evolution reactions

Cited by 70 publications

References 58 publications

Oxygen Reduction Reaction and Hydrogen Evolution Reaction Catalyzed by Pd–Ru Nanoparticles Encapsulated in Porous Carbon Nanosheets

Oxygen Reduction Reaction and Hydrogen Evolution Reaction Catalyzed by Pd–Ru Nanoparticles Encapsulated in Porous Carbon Nanosheets

Elucidating the Role of Oxide–Oxide/Carbon Interfaces of CuO_x–CeO₂/C in Boosting Electrocatalytic Performance

Tunable Assembly of Protein Enables Fabrication of Platinum Nanostructures with Different Catalytic Activity

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Peptide templated Au@Pd core-shell structures as efficient bi-functional electrocatalysts for both oxygen reduction and hydrogen evolution reactions

Cited by 70 publications

References 58 publications

Oxygen Reduction Reaction and Hydrogen Evolution Reaction Catalyzed by Pd–Ru Nanoparticles Encapsulated in Porous Carbon Nanosheets

Oxygen Reduction Reaction and Hydrogen Evolution Reaction Catalyzed by Pd–Ru Nanoparticles Encapsulated in Porous Carbon Nanosheets

Elucidating the Role of Oxide–Oxide/Carbon Interfaces of CuOx–CeO2/C in Boosting Electrocatalytic Performance

Tunable Assembly of Protein Enables Fabrication of Platinum Nanostructures with Different Catalytic Activity

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Elucidating the Role of Oxide–Oxide/Carbon Interfaces of CuO_x–CeO₂/C in Boosting Electrocatalytic Performance