Electrospinning Synthesis of Porous CoWO₄ Nanofibers as an Ultrasensitive, Nonenzymatic, Hydrogen‐Peroxide‐Sensing Interface with Enhanced Electrocatalysis

Abstract

In this work, porous WO3, Co3O4, and CoWO4 nanofibers (NFs) were fabricated by using an electrospinning technique followed by high‐temperature calcination. The different NFs were used to modify biosensor electrodes and detect H2O2 without the help of an enzyme. The electrochemical results indicated that the CoWO4 NF‐based sensor presented a remarkable electrocatalytic activity towards H2O2 oxidation, including lower redox potential, lower detection limit, fast response, as well as the widest linear range among our designed biosensors of this type. Furthermore, we found that the ideal test potential of a nonenzymatic biosensor is closely dependent on the composition of the detected electrode surface, and the test potential has a great effect on the detection linear range of nanomaterial‐based biosensors. The results of this work provide a new way to explore excellent nanomaterials for modifying nonenzymatic biosensor electrodes.

Combinatorial Screening of Cu–W Oxide-Based Photoanodes for Photoelectrochemical Water Splitting

“…61 For Cu 44 Co 9 W 47 O x (Figure S16), Co 2p high-resolution XP spectra show Co in the oxidation state +2; the binding energy agrees with values reported for CoWO 4 . 62,63 A small amount of Cu + was identified in Cu 44 Co 9 W 47 O x , as indicated by the shoulder at 931.9 eV. 61 In contrast, the Cu 44 Ni 9 W 47 O x sample (Figure S17) contains Cu only in oxidation state +2, and no Cu + is present.…”

Bifunctional electro-catalytic performances of CoWO4 nanocubes for water redox reactions (OER/ORR)

“…30 CoWO 4 nanoparticles were also reported as the electro-catalysts for oxygen evolution reactions (OER) but from the best of our literature survey, oxygen reduction reactions (ORR) using CoWO 4 nano-catalysts are still missing. A series of delafossites nanostructured materials has been developed by Ahmed et al for oxygen and hydrogen evolution reactions (OER and HER) from the electrochemical water splitting reaction in alkaline medium.…”

High-Entropy Oxide Nanofibers as Catalytic Host Promising High Volumetric Capacity of Sulfur-Based Composites for Lithium–Sulfur Batteries

“…By employing electrospinning-calcination technology, HE-CWO nanofibers were obtained. , Specifically, a mixture of Ni­(CH 3 COOH)·4H 2 O, Co­(CH 3 COOH)·4H 2 O, Mn­(CH 3 COOH)·4H 2 O, Cu­(CH 3 COOH)·H 2 O, Zn­(CH 3 COOH)·2H 2 O, WCl 6 , and polyacrylonitrile (PAN) were dispersed in N , N -dimethylformamide (DMF, 10 mL) with continuous stirring for 12 h to obtain a homogeneous solution. The spinning membrane was obtained through electrospinning technology with a settled voltage of 20 kV, a flow speed of 1 mL h –1 , and a distance of 12 cm between the syringe nozzle and receiving screen.…”