Boosting the electrochemical oxygen reduction activity of hemoglobin on fructose@graphene-oxide nanoplatforms

Abstract

A metal-free oxygen reduction reaction (ORR) electrocatalyst with outstanding performance was obtained through an easy and one-pot synthesis of hemoglobin functionalized fructose@graphene-oxide (GO) nanocomposites.

Thermal and light irradiation effects on the electrocatalytic performance of hemoglobin modified Co3O4-g-C3N4 nanomaterials for the oxygen evolution reaction

“…Hb is a tetrameric redox protein formed by four polypeptide chains in which each polypeptide domain encloses at least one iron active redox centre that provides both hierarchically structure and porous framework to the whole. This redox protein has been previously reported by Compton et al 35 and Franco et al 36 as an outstanding electrocatalytic biomaterial for ORR. Our characterization results demonstrate the beneficial effect between three components (i.e.…”

Facile synthesis of C60-nano materials and their application in high-performance water splitting electrocatalysis

“…Figure 4b and 4d show the ORR polarization curves recorded at different rotation rates and the resulting K-L plot of the C60 nanotubes material, respectively. The excellent fitting demonstrates a first-order reaction toward dissolved O2 [10.1021/cm500805c], [42]. For all the voltammograms, background currents measured under saturated Ar conditions at the same potential scan rate (5 mV•s -1 ) were subtracted from the respective curves to avoid the capacitive contributions.…”

“…For all the voltammograms, background currents measured under saturated Ar conditions at the same potential scan rate (5 mV•s -1 ) were subtracted from the respective curves to avoid the capacitive contributions. From the K-L plots and using the K-L equations, 41,42 the average number of electrons transferred (n) per oxygen molecule at -0.1 V vs RHE was calculated (see Table 1).…”

Covalent Functionalization of Graphene Oxide with Fructose, Starch, and Micro-Cellulose by Sonochemistry

“…These graphemic materials are chemically grafted or covalently functionalized with other organic and inorganic molecules (nanohybrids) [5] to be used as raw material in the manufacturing of solar cells [6], battery electrodes [7], biosensors [8], and prostheses [9], among others [10,11], where graphite and GO considerably improve the performance of the products. Nanohybrids grafted with organic molecules, as starch and fructose, are used due to their biodegradation [12,13] and biocompatibility as material for antibiotic recovery in milk [14], manufacturing of antimicrobial films for foods [15,16], formulation of bio-nano-compounds [17][18][19][20][21][22], supercapacitors [23][24][25][26], fuel cells [27], water purification membranes [28][29][30], biosensors [31,32], adhesives [33], and bone implants [34]. To synthetize these GO/starch [35][36][37][38][39][40][41][42][43][44][45][46] and GO/fructose [27] nanohybrids, chemical processes include exfoliated graphi...…”

“…Starch or fructose are added and mixed at 30-180 • C for 9-72 h (reaction time) [25,35,43]. Other methods use solvents as acetonitrile [27], 2 of 14 dimethylformamide [40], and anhydrous dimethylsulfoxide [44] along with other additives to control pH (sodium hydroxide, ammonia) [38,46], reduce reaction time by 4-6 h (hydrazine, epichlorohydrin) [37,38], and activate hydroxyl groups (OH) of GO (1-ethyl-3-(3 dimethylaminopropyl) carbodiimide chlorohydrate, 4-dimethylaminopyridine) [44].…”