Electrochemical performance of Ti3C2Tx MXene in aqueous media: towards ultrasensitive H2O2 sensing

Abstract

An extensive characterization of pristine and oxidized TiCT (T: =O, -OH, -F) MXene showed that exposure of MXene to an anodic potential in the aqueous solution oxidizes the nanomaterial forming TiO layer or TiO domains with subsequent TiO dissolution by F ions, making the resulting nanomaterial less electrochemically active compared to the pristine TiCT. The TiCT could be thus applied for electrochemical reactions in a cathodic potential window i.e. for ultrasensitive detection of HO down to nM level with a response time of approx. 10 s. The manuscript also shows electrochemical behavior of TiCT modified electrode towards oxidation of NADH and towards oxygen reduction reactions.

Surface Modified MXene‐Based Nanocomposites for Electrochemical Energy Conversion and Storage

“…Recent studies have shown that the irreversible electrochemical oxidation of Ti 3 C 2 T m MXene might present a stable window for electrochemical applications . However, the bare MXene materials show less active for either HER or OER.…”

Free‐Standing 3D Electrodes for Electrochemical Detection of Hydrogen Peroxide

“…[22][23] As summarized in previous reviews, the electrocatalysts cover metal and alloys (Au, Ag, Pt, Pd, AuAg, [a] Dr. PtPd, RuRh, et al), metal oxides (MnO 2 , TiO 2 , Co 3 O 4 , Fe 3 O 4 , CuO, et al), metal complexes (ferric hexacyanoferrate, metallophthalocyanines, metalloporphyrins, et al), organic and polymeric materials (redox dyes, conductive polymers, et al), carbon nanomaterials (carbon nanotubes, graphene, doped carbon materials, et al), as well as their hybrids with two or more composites. [24][25][26] Recent researches further develop cheap, abundant, easy-accessible materials including transition metal sulfides (TMSs), [27][28][29][30] metal-organic frameworks (MOFs), [31][32][33][34] layered double hydroxides (LDHs), [35][36] metal hydroxides, [37][38] polyoxometalates (POMs), [39][40][41] MXene, [42][43][44] zeolites [45][46][47] black phosphorus, [48][49] and porous silicon [50][51][52][53] based catalysts, et al Some non-enzyme biomaterials, like hemin, G-quadruplex, are also involved in inorganic-organic nanohybrid catalysts.…”

Vortex Fluidic Mediated Synthesis of TiO2 Nanoparticle/MXene Composites

“…The processing generates NPs of fragmented MXene which co-assemble with anatase NPs in forming novel spheroidal TiO 2 NPs/MXenes composite material, which is stable for extended periods. We note that the ready availability of TiO 2 NPs/MXene composites using a VFD offers potential for applications requiring biocompatibility for enzymes, [22] use in modified glassy carbon electrodes for H 2 O 2 reduction, [25] nitrite detection, [26] glucose and sodium alanate, [28] Li-ion battery anodes [29] and as photocatalyst. [30] Experimental Section Materials Ti 2 AlC powder precursor was obtained commercially (KANTHAL, Maxthal 211 Ti 2 AlC).…”

“…[19] In addition, MXenes decorated with TiO 2 quantum dots (QDs) feature in LiÀ S batteries, [20] MXene-Cu 2 O catalyses the thermal decomposition of ammonium perchlorate, [21] MXene-enzyme feature in electrochemical biosensors, [22] MXenes-CNTs improve electrochemical performance, [8] and MXene-Pt nanoparticles have sensing application [23] with others for determining ion exchange capacity. [24] More specifically, TiO 2 nanoparticle (NP)/ MXene composites feature in rendering MXene biocompatible for enzyme attachment, [22] enhancing the efficiency of MXene modified glassy carbon electrodes for H 2 O 2 reduction, [25] nitrite detection, [26] low detection limits of glucose [27] and sodium alanate, [28] Li-ion battery anodes [29] and photocatalysis. [30] Thermal methods have been used to oxidize MXene to TiO 2 or TiO 2 NPs/MXene.…”