Iridium on vertical graphene as an all-round catalyst for robust water splitting reactions

Abstract

Iridium on vertical graphene nano-hills emerges as a highly active and robust catalyst for the total water splitting reaction in both acidic and alkaline electrolytes.

CVD Graphene on Textured Silicon: An Emerging Technologically Versatile Heterostructure for Energy and Detection Applications

“…The VGNH were grown on initially formed horizontal graphene layers on the textured-Si surface. [120,121] The light could pass between the VGNH and the horizontal graphene layers provided good in-plain electrical connectivity. Hence, the reduced reflectance and the enlarged effective surface area significantly enhanced the photocurrent density and an overall efficiency of the VGNH/textured-Si based solar [108] Copyright 2018, Elsevier.…”

Enhancing Iridium Nanoparticles’ Oxygen Evolution Reaction Activity and Stability by Adjusting the Coverage of Titanium Oxynitride Flakes on Reduced Graphene Oxide Nanoribbons’ Support

“…[25] Nevertheless, sp 2 -hybridized carbon derivatives with a high degree of graphitization are thermodynamically more stable and have been recently proposed as supports for OER in acidic media. [26][27][28][29][30][31][32][33][34] They are expected to degrade less and at a lower rate than carbon blacks. [28,[34][35][36] In addition, the appropriate support selection can increase nanoparticle stability by suppressing particle agglomeration.…”

“…[28,[34][35][36] In addition, the appropriate support selection can increase nanoparticle stability by suppressing particle agglomeration. [27][28][29]37] Carbon was also used as a support for Pt/Ir ORR-OER bifunctional catalysts [38] with good stability even though Pt is known to catalyze the oxidation reaction of carbon. [39,40] Recently, a growing number of potential carbon alternatives have been investigated, namely (doped) metal nitrides, [41,42] carbides, [43,44] perovskites, [45] or oxides.…”

Perspective on intermetallics towards efficient electrocatalytic water-splitting

“…114 Although Pt and Ru-based materials have been considered the best working electrocatalysts for HER, very recently, Ir has also garnered significant attention towards HER. 190,191 As Ir can provide better stability at a high anodic potential than Ru in acidic conditions, it is considered as one of the very few catalysts driving efficient OER and HER in a broad range of pH. 191 Making use of the bifunctionality with an oxophilic metal to promote the water dissociation and production of hydrogen intermediates, a structurally ordered intermetallic Ir 3 V was synthesized by Chen and co-workers to facilitate the HER.…”

“…190,191 As Ir can provide better stability at a high anodic potential than Ru in acidic conditions, it is considered as one of the very few catalysts driving efficient OER and HER in a broad range of pH. 191 Making use of the bifunctionality with an oxophilic metal to promote the water dissociation and production of hydrogen intermediates, a structurally ordered intermetallic Ir 3 V was synthesized by Chen and co-workers to facilitate the HER. Vanadium being a highly oxophilic metal with the strongest metal-OH bond among the transition metals formed a structurally ordered phase with Ir (Ir 3 V) resulting in superior electrocatalytic behavior for alkaline HER.…”