Pt Concave Nanocubes with High-Index Facets as Electrocatalysts for Glucose Oxidation

Abstract

The modification of the surface atomic arrangements, especially the exposure of high-index facets, has been considered as a valid strategy to strengthen the catalytic performance of Pt-based nanocrystals. In this article, Pt concave nanocubes (Pt CNCs) with exposed high-index (510) facets are facilely synthesized through a hydrothermal method. Polyvinylpyrrolidone (PVP) and glycine are required for shape control. The mechanism of electrocatalytic oxidation toward glucose by Pt CNCs is fully discussed. The exposed high-index facets consist of abundant low-coordinated atoms (containing edges, steps, and kinks), can supply sufficient active sites for the adsorption of reactants and intermediate species, and thus enhance the catalytic activity in glucose oxidation. By using saturated calomel electrode as the reference electrode, a 1 cm2 platinum sheet as the counter electrode, and glassy carbon electrode (GCE) as the working electrode, the Pt CNC catalyst-decorated GCE exhibits higher peak current densities of 0.25, 0.15, and 0.56 mA cm–2 than those of the commercial Pt/C (10 wt. %)-modified GCE. The Pt CNC catalyst shows a rapid response toward the changes in glucose concentration. The electrocatalytic oxidation of glucose exhibits better performance in neutral and alkaline conditions than in an acidic electrolyte. Above all, the prepared Pt CNC catalysts with high-index (510) facets are expected for their wide use as abiotic catalysts in the electrocatalytic oxidation of glucose.

Synthesis of Carbon Black Loaded Pt Concave Nanocubes with High-Index Facets and their Enhanced Electrocatalytic Properties toward Glucose Oxidation

“…The peak current densities measured on the Pt CNC/CB anode are 0.22, 0.20, and 0.60 mA cm −2 , respectively. It exhibits higher catalytic activity than Pt CNC and commercial Pt/C catalysts, compared with our previous study [43]. The improved catalytic activity can be attributed to the addition of CB catalyst support, which largely improves the dispersity of the Pt CNCs and lets the active HIFs of Pt CNCs exposed adequately.…”

Low‐energy Hemiacetal Dehydrogenation Pathway: Co‐production of Gluconic Acid and Green Hydrogen via Glucose Dehydrogenation

“…Thus, the hemiacetal groups of cyclic glucose may enable the efficient and cost‐effective catalytic conversion of biomass to high‐value‐added chemicals and fuels under relatively mild conditions. The conversion of biomass into high‐value‐added chemicals and fuels reduces our dependence on rapidly depleting, non‐renewable resources such as fossil fuels [5–7] …”

“…The conversion of biomass into highvalue-added chemicals and fuels reduces our dependence on rapidly depleting, non-renewable resources such as fossil fuels. [5][6][7] Glucose, a six-carbon aldose, has attracted great interest as a renewable resource because it is relatively easily derived from biomass. The catalytic oxidation of glucose to gluconic acid and its salts (GNA), which are important chemical substances that exhibit good biodegradability and biocompatibility, is performed using H 2 O 2 or O 2 as an oxidizing agent (Scheme 1a).…”

Role of metal (Pt)–support (MgO) interactions in base-free glucose dehydrogenation

“…[1][2][3] Glucose dehydrogenation, which affords gluconic acid and H 2 , is a promising means of catalytic biomass conversion [4][5][6] because glucose is easily sourced from abundant biomass resources, while gluconic acid is widely used in construction, food, pharmaceutical, and paper industries. 2,7,8 Zhang et al and Liu et al developed cost-effective electrocatalytic processes for the dehydrogenation of glucose 9,10 based on the coupling of glucose oxidation and H 2 evolution reactions.…”