# Pseudocapacitive Titanium Oxynitride Nanowires for Ultrahigh Capacitance Supercapacitors

## TL;DR

Researchers developed titanium oxynitride nanowires with much higher capacitance than thin films, making them promising for supercapacitors.

## Contribution

The study introduces TiNO nanowires with ultrahigh capacitance and energy density for supercapacitor applications.

## Key findings

- TiNO nanowires showed 2725 mF/cm² capacitance, six times higher than TiNO thin films.
- Nanowires exhibited an energy density of 1.35 μWh/cm², significantly higher than thin films.
- Surface oxidation stabilizes the (110) orientation in TiNO nanowires.

## Abstract

High-quality, multifunctional two-dimensional (2D) titanium
oxynitide
(TiNO) thin films and one-dimensional (1D) TiNO nanowires have been
synthesized using a pulsed laser deposition, a simple, fast, and congruent
evaporation method. First-principles calculations as a function of
surface orientation and termination indicate that surface oxidation
of TiNO nanowires can stabilize the (110) orientation observed experimentally.
The specific capacitance value for the TiNO nanowire samples (2725
mF/cm2) has been found to be nearly six times more than
that of the TiNO thin film samples (400 mF/cm2), which
is attributed to the high packing density of TiNO nanowires over a
given area. The nanowire samples have also been found to exhibit a
significantly higher energy density (1.35 μWh/cm2) than the TiNO thin-film samples (0.33 μWh/cm2).
Thus, the TiNO material system in thin-film and nanowire forms has
been demonstrated to be a promising candidate for use as an electrode
material in supercapacitors and other charge-storage applications.