Fluorane sensitive supercapacitive microcrystalline MoO₃

dual application in energy storage and HF detection

authored by

Love Bansal, Tanushree Ghosh, Suchita Kandpal, Chanchal Rani, Bhumika Sahu, Deb Kumar Rath, Christoph Wesemann, Sandeep Chhoker, Nadja C. Bigall, Rajesh Kumar

Abstract

Exploring materials and device paradigms for multifunctional electrochemical applications such as supercapacitors and sensing makes materials more suitable for real-life applications. In this study, microcrystalline MoO₃ powder has been synthesized using a simple sol-gel method, and its suitability for energy storage devices and HF sensing performance has been studied. The MoO₃ microcrystallites, well-characterized using electron microscopy, X-ray diffraction, and Raman spectroscopy, have been tested for HF sensitivity on a glassy carbon electrode as well as on a carbon cloth electrode. Similarly, a solid-state prototype asymmetric supercapacitor has been demonstrated that displays its charge storage capabilities. The specific capacitance of MoO₃ increases linearly with the increase of HF concentration. Additionally, the sensing performance of MoO₃ can be seen by monitoring changes in current passing through the electrode in the presence of HF. High stability with good repeatability was displayed. In situ Raman spectroscopy, recorded during the charging and discharging process, has been used to understand the charge storage mechanism. A high sensitivity of 6656 mF mM⁻¹ g⁻¹ with a low limit of detection of 1.2 μM was observed, which makes this material suitable for sensing as well as charge storage.

Organisation(s)

Institute of Physical Chemistry and Electrochemistry
PhoenixD: Photonics, Optics, and Engineering - Innovation Across Disciplines

External Organisation(s)

Indian Institute of Technology Indore (IITI)
Cornell University
Jaypee University of Information Technology

Type

Article

Journal

Materials Advances

Volume

4

Pages

4775-4783

No. of pages

9

Publication date

24.08.2023

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Chemistry (miscellaneous), Materials Science(all)

Electronic version(s)

https://doi.org/10.1039/d3ma00357d (Access: Open)