Faceted and Dendritic Solidification Structures

Fredriksson, Hasse; Åkerlind, Ulla

doi:10.1002/9781119975540.ch9

Cited by 3 publications

(1 citation statement)

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“…The most interesting phenomenon observed for the NiRh alloys is that the preferential facet of Ni changed from (220) to (111) and (200) when alloyed with up to 11% Rh ( Figure 2B). As the shape of a faceted crystal is determined by the growth of the surface with the lowest growth rate, 53 Figure 3. As mentioned in our previous study, 54 the GC substrate does not show any activity for the HOR in KOH solution; therefore, it is not presented herein.…”

Section: Resultsmentioning

confidence: 99%

Electrodeposited NiRh alloy as an efficient low‐precious metal catalyst for alkaline hydrogen oxidation reaction

Tran

Park

Kim

et al. 2020

Intl J of Energy Research

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Developing a non-precious or low Pt-group metal-containing (low-PGM) hydrogen oxidation reaction (HOR) catalyst is crucial to fabricate economic anion exchange membrane fuel cells (AEMFCs), an alternative to proton exchange membrane fuel cells (PEMFC). In this study, low-PGM Ni 100-x Rh x electrocatalysts, seldomly studied as alkaline HOR catalysts, with various compositions are fabricated via electrodeposition. Substantial changes are observed in both the morphology and crystalline structure of the catalysts when Ni is alloyed with Rh, such as enlarged surface area and development of different textures. The HOR activities of Ni 100-x Rh x catalysts evaluated in 0.1 M KOH solution are dramatically enhanced because of the enlarged surface area, bifunctional roles of H-providing sites (Ni/Rh) and OH-providing sites (Ni [OH] 2 /Rh 2 O 3), and their balanced composition on the surface. The durability of Ni 89 Rh 11 , the most appropriate catalyst, is investigated with the 3000 potential cycling, giving the average decay rate of approximately 0.30 μA cm −2 /cycle. The origin of enhanced activity and degradation during durability test was explained in terms of the electronic structures and surface composition of the catalysts. The initial high HOR activity of about 1.5 mA/cm 2 for Ni 89 Rh 11 at 0.05 V RHE , though it requires a further improvement in the durability, suggests the practical feasibility of it as a low PGM alkaline HOR catalyst.

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Section: Resultsmentioning

confidence: 99%