Remarkable differences in the voltammetric response towards hydrogen peroxide, oxygen and Ru(NH3)63+ of electrode interfaces modified with HF or LiF-HCl etched Ti3C2Tx MXene

Veronika Gajdosova; Lenka Lorencova; Michal Prochazka; Maria Omastova; Matej Micusik; Simona Prochazkova; Filip Kveton; Monika Jerigova; Dusan Velic; Peter Kasak; Jan Tkac

doi:10.1007/s00604-019-4049-6

Remarkable differences in the voltammetric response towards hydrogen peroxide, oxygen and Ru(NH₃)₆³⁺ of electrode interfaces modified with HF or LiF-HCl etched Ti₃C₂T_x MXene

Mikrochim Acta. 2019 Dec 17;187(1):52. doi: 10.1007/s00604-019-4049-6.

Authors

Veronika Gajdosova¹, Lenka Lorencova¹, Michal Prochazka², Maria Omastova², Matej Micusik², Simona Prochazkova³, Filip Kveton¹, Monika Jerigova^{4

5}, Dusan Velic^{4

5}, Peter Kasak⁶, Jan Tkac⁷

Affiliations

¹ Institute of Chemistry, Slovak Academy of Sciences, Dubravska cesta 9, Bratislava, 845 38, Slovak Republic.
² Polymer Institute, Slovak Academy of Sciences, Dubravska cesta 9, Bratislava, 845 41, Slovak Republic.
³ Department of Analytical Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Ilkovicova 6, 842 15, Bratislava, Slovak Republic.
⁴ Department of Physical Chemistry, Faculty of Natural Sciences, Comenius University, Mlynska Dolina, Bratislava, 842 15, Slovak Republic.
⁵ International Laser Centre, Ilkovicova 3, Bratislava, 841 04, Slovak Republic.
⁶ Center for Advanced Materials, Qatar University, P.O. Box 2713, Doha, Qatar.
⁷ Institute of Chemistry, Slovak Academy of Sciences, Dubravska cesta 9, Bratislava, 845 38, Slovak Republic. Jan.Tkac@savba.sk.

PMID: 31848717
DOI: 10.1007/s00604-019-4049-6

Abstract

An electrochemical study was performed on the behavior of Ti₃C₂T_x MXenes prepared by using either HF (MXene1) or LiF/HCl as etchants (MXene2). The use of two redox probes indicates the presence of a higher negative charge density on MXene2 in comparison to MXene1. The characterization of two nanomaterials shows that titanium and fluoride are present higher by one order of magnitude at the interface of MXene2, compared to MXene1. The high Ti and F content is accompanied by a 82-fold larger (249 μA·cm^-2 vs. 5.64 μA·cm^-2) anodic peak at the peak potential near 0.4 V (vs. Ag/AgCl). Similarly, the peak current on MXene2 is 317-fold higher for the oxygen reduction at pH 7.0 (at a voltage of -0.84 V) and 215-fold higher for the reduction of H₂O₂ at -0.89 V, when compared to MXene1. Graphical abstractDifference in electrochemical behavior of MXene prepared by HF (MXene1) and LiF/HCl (MXene2) as etchants.

Keywords: Electrocatalysis; Electrochemistry; H2O2 reduction; MXene; Oxygen reduction reactions; Redox stability; Ti3C2TX.

Publication types

Research Support, Non-U.S. Gov't

Abstract

Publication types

Grants and funding