Platinum nanosheets synthesized via topotactic reduction of single-layer platinum oxide nanosheets for electrocatalysis

Abstract

Increasing the performance of Pt-based electrocatalysts for the oxygen reduction reaction (ORR) is essential for the widespread commercialization of polymer electrolyte fuel cells. Here we show the synthesis of double-layer Pt nanosheets with a thickness of 0.5 nm via the topotactic reduction of 0.9 nm-thick single-layer PtOx nanosheets, which are exfoliated from a layered platinic acid (HyPtOx). The ORR activity of the Pt nanosheets is two times greater than that of conventionally used state-of-the-art 3 nm-sized Pt nanoparticles, which is attributed to their large electrochemically active surface area (124 m2 g−1). These Pt nanosheets show excellent potential in reducing the amount of Pt used by enhancing its ORR activity. Our results unveil strategies for designing advanced catalysts that are considerably superior to traditional nanoparticle systems, allowing Pt catalysts to operate at their full potential in areas such as fuel cells, rechargeable metal–air batteries, and fine chemical production.

Nanoarchitectonics of Metallene Materials for Electrocatalysis

“…176 An effective strategy to overcome this barrier is to construct 2D noble metal nanosheets, which can provide large numbers of edges, kinks, and unsaturated atoms in favor of the adsorption and activation of O 2 , therefore facilitating the ORR kinetics. For example, Sugimoto et al 177 demonstrate the successful fabrication of Pt nanosheets with 0.5 nm thickness via topotactic reduction of platinum oxide nanosheets. The high specific activity of the Pt nanosheets was ascribed to appropriate oxygen coverage on the Pt surface, confirmed by in situ XAFS.…”

Unified ORR mechanism criteria via charge–spin–coordination of Fe functional units

“…[3][4][5][6] It is known that the unfilled 3d valence orbital (3d 6 4s 2 ) makes Fe a promising candidate among non-noble metals. [7][8][9][10][11] The highly delocalized valence-shell electronic configuration enables the diversity of regulating the Fe electronic configuration, and the unique d-p hybrid also ensures efficient electron transfer with OCs. [12][13][14] So these unique structural advantages contribute to Fe as a leader in the ORR.…”

Ultrathin Holey Pt–M Alloy Nanosheets via Sequential Kinetic–Thermodynamic Metal Reduction Control

“…Ultrathin two-dimensional (2D) metal nanosheets have been the subject of intensive research for various catalytic reactions due to their unique properties coming from anisotropic structures and atomic thickness compared with bulk. − Ultrathin metal nanosheets with a high surface-to-volume ratio significantly enhanced the catalytic performances via their high utilization efficiency of the metal. − In addition, the development of bimetallic alloy nanosheets has provided a route to improve the desirable properties for various electrocatalytic reactions in comparison to monometallic nanosheets. − …”