Platinum Group Metal-based Nanosheets: Synthesis and Application towards Electrochemical Energy Storage and Conversion

Sugimoto, Wataru; Takimoto, Daisuke

doi:10.1246/cl.210087

Cited by 9 publications

(7 citation statements)

References 93 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, the structure of IrO 2 nanosheets reflects that of the parent crystal (K 0.2 IrO 2 nH 2 O). [ 36 ] This layered compound consists of 2D IrO 2 layers with intercalated potassium atoms that are extracted during the exfoliation process via cation exchange. The purely 2D structure in nature distinguishes it from 3D counterparts such as rutile.…”

Section: Introductionmentioning

confidence: 99%

In Situ Electrical Detection of Methane Oxidation on Atomically Thin IrO₂ Nanosheet Films Down to Room Temperature

Ishihara,

Koitaya,

Hamahiga

et al. 2023

Adv Materials Inter

Self Cite

View full text Add to dashboard Cite

Activation of the CH bond is the first step in converting methane into valuable chemicals. Herein, the successful induction and electrical detection of a methane oxidation reaction are reported at room temperature using IrO2 nanosheets, a 2D form of IrO2. A clear decrease in electrical resistance upon exposure to methane is observed by using atomically thin IrO2 nanosheet films. The resistance decrease disappears upon simultaneous exposure to oxygen, suggesting that methane is oxidized by consuming the lattice oxygen of the IrO2 nanosheets and that the oxygen vacancies generated are recovered by oxygen in the atmosphere. The resistance decrease is observed even at 300 K, indicating the high methane oxidation ability of the IrO2 nanosheets. These results are confirmed by a shift of the Ir 4f peaks in ambient pressure X‐ray photoelectron spectra. Furthermore, deposition of amorphous carbon, that is, methane oxidation products, on IrO2 nanosheets is also confirmed by Raman scattering spectroscopy after prolonged methane exposure at high temperatures in the absence of oxygen. This study demonstrates the ability of IrO2 nanosheets to oxidize methane at least down to 300 K and is an important example of the usefulness and simplicity of chemical reaction monitoring using electrical resistance changes.

show abstract

Section: Introductionmentioning

confidence: 99%

In Situ Electrical Detection of Methane Oxidation on Atomically Thin IrO₂ Nanosheet Films Down to Room Temperature

Ishihara,

Koitaya,

Hamahiga

et al. 2023

Adv Materials Inter

Self Cite

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

“…Platinum-group-metal (PGM)-based electrocatalytic materials have been extensively investigated for diverse kinds of research areas especially for electrochemical energy conversion devices including fuel cells , water electrolyzers, and metal–air batteries. , In particular, Pt has demonstrated excellent activity and durability toward the fuel cell reactions including the oxygen reduction reaction (ORR), ,− methanol oxidation reaction (MOR), ,− and hydrogen evolution reaction (HER). − However, the low abundance, high cost, and ease of their poisoning seriously limit their utility for the design of economically viable energy conversion electrochemical devices. In the ensuing search for alternatives to PGM-based materials, several non-noble metals, − transition metal oxides, , metal-doped carbon composites , and metal-free carbon-based catalysts , have been explored as potential electrocatalysts for the fuel cell-related processes.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Multifunctional Electrocatalytic Activity of Pt-Co Nanoalloy-Decorated Graphene Oxide Sheets through Strong Metal–Support Interaction

et al. 2022

View full text Add to dashboard Cite

Presently, minimizing the usage and boosting the electrocatalytic efficiency of the otherwise costly platinum group-based materials appear to be the only practical option for commercial utilization of electrochemical energy conversion devices. To this end, exploring the suitability of multifunctional catalyst materials could be a promising strategy. In this regard, combining the different functionalities like hybrids of inorganic and organic materials could be a potential approach. However, a comprehensive mechanistic understanding about the role of composition to the catalytically active sites in multifunctional electrocatalysts is crucial for the design of suitably active and durable electrocatalysts for these devices. To address this, we attempted to explore and understand the combined effect of alloying and graphene oxide (GO) support interactions over the electrocatalytic activity of Pt-Co/rGO electrocatalysts. For this, Pt-Co/rGO nanoalloys with varying Pt:Co ratios were prepared via simple hydrothermal treatment and tested for three important fuel cell reactions viz. oxygen reduction, methanol oxidation, and hydrogen evolution reactions. Among the so-crafted and electrocatalytically explored Pt:Co compositions viz. 1:1, 1:3, and 3:1 (with and without GO), the GO composite with a Pt:Co molar ratio of 1:1, i.e., Pt1Co1/rGO demonstrated the best electrocatalytic activity and durability for long-term electrolysis. The significantly enhanced multifunctional catalytic activity and stability of the crafted catalysts are attributed to the synergism between Pt-Co nanoalloys and rGO support that modifies the d-band electronic structure of Pt via ‘strong metal–support interaction’ and to the lattice strain induced by nanoalloying of Pt with Co.

show abstract

“…As typical metal nanosheets, Pt metal nanosheets were synthesized because they are potential candidates for future nanosheets devices and catalysts. 26 We synthesized the surfactant crystals with planarly arranged Pt complexes as a precursor and designed the morphology and thickness of the 2D surfactant crystals via the recrystallization process. Then, the 2D surfactant crystals were treated with UV-ozone and reduced by H 2 (5%)/Ar.…”

Section: Introductionmentioning

confidence: 99%

Tailored synthesis of molecularly thin platinum nanosheets using designed 2D surfactant solids

et al. 2022

View full text Add to dashboard Cite

show abstract

Platinum Group Metal-based Nanosheets: Synthesis and Application towards Electrochemical Energy Storage and Conversion

Cited by 9 publications

References 93 publications

In Situ Electrical Detection of Methane Oxidation on Atomically Thin IrO₂ Nanosheet Films Down to Room Temperature

In Situ Electrical Detection of Methane Oxidation on Atomically Thin IrO₂ Nanosheet Films Down to Room Temperature

Enhanced Multifunctional Electrocatalytic Activity of Pt-Co Nanoalloy-Decorated Graphene Oxide Sheets through Strong Metal–Support Interaction

Tailored synthesis of molecularly thin platinum nanosheets using designed 2D surfactant solids

Contact Info

Product

Resources

About

Platinum Group Metal-based Nanosheets: Synthesis and Application towards Electrochemical Energy Storage and Conversion

Cited by 9 publications

References 93 publications

In Situ Electrical Detection of Methane Oxidation on Atomically Thin IrO2 Nanosheet Films Down to Room Temperature

In Situ Electrical Detection of Methane Oxidation on Atomically Thin IrO2 Nanosheet Films Down to Room Temperature

Enhanced Multifunctional Electrocatalytic Activity of Pt-Co Nanoalloy-Decorated Graphene Oxide Sheets through Strong Metal–Support Interaction

Tailored synthesis of molecularly thin platinum nanosheets using designed 2D surfactant solids

Contact Info

Product

Resources

About

In Situ Electrical Detection of Methane Oxidation on Atomically Thin IrO₂ Nanosheet Films Down to Room Temperature

In Situ Electrical Detection of Methane Oxidation on Atomically Thin IrO₂ Nanosheet Films Down to Room Temperature