Structural Effects on the Activity for the Oxygen Reduction Reaction on the High-Index Planes of Palladium in Alkali Solution

Kiguchi, Fumiya; Nakamura, Masashi; Hoshi, Nagahiro

doi:10.1007/s12678-021-00681-8

Cited by 3 publications

(4 citation statements)

References 29 publications

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“…Moreover, Pd/C exhibited an additional shoulder at 0.64 V, which could be ascribed to Pd{111} or Pd{100} steplike sites on the surface. 24 These steplike features, however, were relatively weaker in the PdH x NS-80 and PdH x NS-140 catalysts and even absent in PdH x NS-190. These results revealed that the step site density in PdH x NSs catalysts is significantly lower than that on Pd/C and decreases with increased synthesis temperature, consistent with the increase in the average coordination numbers, as inferred from the EXAFS spectra.…”

Section: ■ Results and Discussionmentioning

confidence: 96%

“…This observation suggests that the surfaces of PdH x NSs and Pd/C catalysts are dominated by Pd{111} facets. Moreover, Pd/C exhibited an additional shoulder at 0.64 V, which could be ascribed to Pd{111} or Pd{100} steplike sites on the surface . These steplike features, however, were relatively weaker in the PdH x NS-80 and PdH x NS-140 catalysts and even absent in PdH x NS-190.…”

Section: Resultsmentioning

confidence: 99%

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Oxidative Stability Matters: A Case Study of Palladium Hydride Nanosheets for Alkaline Fuel Cells

Zeng

Feng

et al. 2022

J. Am. Chem. Soc.

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Pd-based electrocatalysts are considered to be a promising alternative to Pt in anion-exchange membrane fuel cells (AEMFCs), although major challenges remain. Most of the Pd-based electrocatalysts developed for the sluggish oxygen reduction reaction (ORR) have been exclusively evaluated by rotating disk electrode (RDE) voltammetry at room temperature, rather than in membrane electrode assemblies (MEAs), making it challenging to apply them in practical fuel cells. We have developed a series of carbon-supported novel PdH x nanosheets (PdH x NS), which displayed outstanding ORR performance in room-temperature RDE tests. Specifically, a sample synthesized at 190 °C displayed a mass activity of 0.67 A mg–1 and a specific activity of 1.07 mA cm–2 at 0.95 V vs RHE, representing the highest reported value among Pd-based ORR electrocatalysts in alkaline media and higher than Pt-based catalysts reported in the literature. Furthermore, we employed PdH x NS and commercial Pd/C as model catalysts to systematically study the effects of temperature on their ORR activity in RDE measurements and subsequently evaluated their performance in MEA testing. Our observations indicate/demonstrate how oxidative stability affected the ORR performance of Pd-based electrocatalysts, which provided some critical insights into future ORR catalyst development for alkaline fuel cell applications.

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Section: ■ Results and Discussionmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Oxidative Stability Matters: A Case Study of Palladium Hydride Nanosheets for Alkaline Fuel Cells

Zeng

Feng

et al. 2022

J. Am. Chem. Soc.

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“…Moreover, the two anodic peaks for Pd CUBE at 0.70 and 0.89 V correspond to the oxide film formation on the terrace edges and terraces, respectively. , …”

Section: Resultsmentioning

confidence: 94%

“…The peaks at 0.66 and 0.78 V for Pd OCTA , 0.62 and 0.71 V for Pd RD , and 0.70 and 0.89 V for Pd CUBE can be attributed to the palladium oxide film formation, which is caused by hydroxide anion chemisorption starting at negative potentials, followed by transformation into palladium oxides, which agrees with previously reported data 40,60 Moreover, the two anodic peaks for Pd CUBE at 0.70 and 0.89 V correspond to the oxide film formation on the terrace edges and terraces, respectively. 60,61 The backward scan shows a set of cathodic peaks for all of the Pd NPs related to the palladium oxide layer reduction located between ∼0.5−1.0 V and hydrogen adsorption (∼0.15 V) regions.…”

Section: Electrochemicalmentioning

confidence: 99%

Electrocatalytic Oxidation of Glycerol to Value-Added Compounds on Pd Nanocrystals

Terekhina

White

Cornell

et al. 2023

ACS Appl. Nano Mater.

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Pd octahedral, rhombic dodecahedral, and cubic nanoparticles (PdOCTA, PdRD, and PdCUBE NPs) were synthesized, characterized, and studied as catalysts for the glycerol electrooxidation reaction (GEOR) in a strongly alkaline medium at 20 and 60 °C. The highest mass activity of 0.050 and 0.183 mA/μgPd was observed on PdOCTA at 20 and 60 °C, respectively, whereas PdCUBE exhibited the highest specific activity of 1.49 and 12.84 mA/cmPd 2, respectively. The GEOR products were analyzed by high-performance liquid chromatography (HPLC), and their selectivity and overall glycerol conversion were evaluated at 0.86 V vs RHE. The selectivity toward the three-carbon chain (C3) GEOR products was similar for the different types of catalysts, with PdOCTA and PdCUBE NPs achieving more than 50% selectivity at 20 °C and more than 60% at 60 °C. Glycerate was the overall dominant product for all catalysts, with a selectivity of up to 42%. The glycerol conversion was found to be highest for PdOCTA21% at 20 °C and 82% at 60 °C, while PdRD was the least active and showed less than 3% conversion at 20 °C and 35% at 60 °C. Based on the GEOR product distribution, a reaction mechanism was proposed.

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Oxygen reduction reaction on PdM/C (M = Pb, Sn, Bi) alloy nanocatalysts

Lüsi

Erikson

Piirsoo

et al. 2022

Journal of Electroanalytical Chemistry

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Structural Effects on the Activity for the Oxygen Reduction Reaction on the High-Index Planes of Palladium in Alkali Solution

Cited by 3 publications

References 29 publications

Oxidative Stability Matters: A Case Study of Palladium Hydride Nanosheets for Alkaline Fuel Cells

Oxidative Stability Matters: A Case Study of Palladium Hydride Nanosheets for Alkaline Fuel Cells

Electrocatalytic Oxidation of Glycerol to Value-Added Compounds on Pd Nanocrystals

Oxygen reduction reaction on PdM/C (M = Pb, Sn, Bi) alloy nanocatalysts

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