Monolayer assembly of gold nanodots on polyelectrolyte support: A multifunctional electrocatalyst for reduction of oxygen and oxidation of sulfite and nitrite

Abstract

The present work demonstrates a monolayer self-assembly of methioninecapped gold nanodots (AuNDs) on the glassy carbon electrode (GCE) and its application in various electrocatalytic reactions. Positively charged poly(acrylamide-co-diallyldimethylammonium chloride) (PADA)-modified GCE was used as electrode substrate and monolayer assembly of negatively charged AuNDs was performed over PADA-modified GCE by simple dipping method. The successful modification of AuNDs on GCE was confirmed by characteristic cyclic voltammetry behavior of gold oxidation and reduction. Further to optimize the dipping time duration of AuNDs self-assembly, dipping time-dependent electrocatalysis was performed. Interestingly, the prepared AuNDs self-assembled electrodes exhibit very good electrocatalytic activity in the reduction of oxygen with excellent methanol tolerance and simultaneous electrooxidation of pollutants and food additives, nitrite, and sulfite ions.

Sublimation of isolated toric focal conic domains on micro-patterned surfaces

“…Self-assembled structures, characterized by individual units that can form ordered patterns and mediate shape transitions, represent a fundamental concern across natural sciences, particularly within soft matter physics. [1][2][3][4][5] Notable instances of the intricate relationship between the molecular organization of a soft material and the resulting order, and orientation are evident from various morphologies in these systems. Examples of such soft materials include block copolymers, 6,7 stacked membranes, [8][9][10] and various liquid crystals (LCs).…”

One pot production of Co core/carbon shell materials and their electrocatalytic properties

“…2 The oxygen reduction reaction (ORR) is a slow process due to its requirement of transferring four electrons. 3,4 While Pt/C demonstrates exceptional electrocatalytic ORR performance, its high cost and low oxidation stability present significant challenges. 5 In this regard, there has been significant research into alternatives such as Pt-based alloys with reduced Pt content, carbon-based materials without metal components, single-atom-based catalysts, and non-Pt materials incorporating cost-effective metal elements.…”

“…These systems rely on efficient electrocatalysts to facilitate the reduction of oxygen molecules to water at a cathode 2 . The oxygen reduction reaction (ORR) is a slow process due to its requirement of transferring four electrons 3,4 . While Pt/C demonstrates exceptional electrocatalytic ORR performance, its high cost and low oxidation stability present significant challenges 5 .…”

Termolecular Eley–Rideal pathway for efficient CO oxidation on phosphorene‐supported single‐atom cobalt catalyst

“…[2][3][4][5][6][7][8][9][10] In particular, significant efforts have been devoted to achieve low-temperature CO oxidation catalysis using SAC owing to its fundamental and practical importance in various environmental and industrial applications. [11][12][13][14][15][16] Noble metal-based catalysts, such as Pt, [17][18][19][20][21][22] Pd, 20,23,24 Au, [25][26][27][28][29][30][31] and Rh, 20,32 exhibit extraordinary catalytic activity for various catalytic reactions. Hence, their small (Au, 28,33 Ag, 34 Pt, 35 and Pd 36 ) and bimetallic clusters [37][38][39][40][41] have attracted interest to improve the catalytic activity, especially of CO oxidation, and reduce the extent of the noble metal resource.…”