Chromium Oxynitride as Durable Electrode Material for Symmetric Supercapacitors

Abstract

Recently, metal oxynitrides (MONs) have gained a lot of attention as electrode materials for supercapacitor (SC) applications due to their unique properties such as high electronic conductivity, wettability, corrosion resistance, and chemical robustness. Nanostructuring strategies of MONs opens fresh avenues for energy storage. Though various transition metal oxides (MO) and metal nitrides (MN) have been explored as electrode materials for SC applications, they have limitations associated with poor cyclability and rate capabilities. Hence, there is a value to exploring intermediate oxynitride compounds (MONs) in place of pure MOs and MNs. Chromium oxynitride (CrOXNY) as electrode material is not yet been explored for SC applications. In this context, we have carried out the systematic study of the nanostructured nano‐spherical CrOXNY nanoparticle as an electrode material for SC applications. The electrochemical performance of the CrOXNY electrode is tested in both the three and two electrode assembly. The CrOXNY electrode shows capacitance of 146 F g−1 at 10 mV s−1 in three electrode configuration. The symmetric coin cell (CR2032) is fabricated and tested up to 10,000 cycles at 2 A g−1 and it shows excellent capacity retention up to 98 %. The energy and power densities of the symmetric device are ∼8 W h kg−1 at 1 A g−1 and 28.8 kW kg−1 at 10 A g−1, respectively. As a proof of concept, a red light‐emitting diode (LED) is lit by serially connecting two symmetric coin cells (2 V). These attributes of CrOXNY, such as excellent capacitance retention, long cyclic stability, and high rate capability, indicates that it can be used as a durable electrode material for SC technology.

Facile Synthesis and Optimization of CrOOH/rGO-Based Electrode Material for a Highly Efficient Supercapacitor Device

“…The performances of other reported devices are also plotted against the proposed S70 device for comparison. In the same Ragone diagram, the corresponding values of other reported supercapacitors can also be observed, such as bare rGO, for a coin cell device fabricated with another form of chrome oxide (CrO x N y ) and a flexible supercapacitor based on MoS 2 /rGO . It is evident that the energy density and power density values of our CrOOH/rGO coin cell device are higher and comparable to those of other devices made of similar materials, indicating that our device is a very good candidate for further study as a low-cost supercapacitor.…”

Amorphous Cr2O3 Sheets: A Novel Supercapacitor Electrode Material

“…[1] Supercapacitors (SCs), also known as electrochemical capacitors, are promising energy storage technologies due to their very high specific capacitance, quick charge-discharge rates, high power density (> 10,000 W/kg), and extended cycle life (10 5 cycles). [2] Depending on the storage mechanism, SCs can be divided into electric double-layer capacitors (EDLC) and pseudocapacitors. In pseudocapacitors, the charge is stored through a sequence of redox processes at the electrode material's surface.…”

Composition and optical properties of chromium oxynitride films

“…22,23 Commonly, chromium oxynitride thin films were regarded as a mixture of CrN x and CrO x , not as a single-phase chromium oxynitride compound. 24 Depending on its stoichiometry, a CrN x exhibits metal-like properties (ρ ≈ 6.4 Â 10 À4 Ω cm x ≈ 0.93) or semiconductor properties (ρ > 1 Â 10 À2 Ω cm, x ≈ 1.06), whereas CrO x is an insulating material (E g = 4 eV, ρ Cr2O3 > > 1 Ω cm). 25 Arvinte et al…”

“…Due to the possible change of the nitrogen/oxygen ratio, chromium oxynitride films were widely used for their electrical, optical, and mechanical properties, as well as chemical stability 22,23 . Commonly, chromium oxynitride thin films were regarded as a mixture of CrN x and CrO x , not as a single‐phase chromium oxynitride compound 24 . Depending on its stoichiometry, a CrN x exhibits metal‐like properties ( ρ ≈ 6.4 × 10 −4 x ≈ 0.93) or semiconductor properties (ρ > 1 × 10 −2 , x ≈ 1.06), whereas CrO x is an insulating material ( = 4 eV, ρ Cr2O3 > > 1 ) 25 .…”