Investigations on Gas Sensing and Energy Storage Applications of NiCo2O4
This study investigates NiCo _2 O _4 (NCO) as a material for both the functional detection of NH _3 gas and for energy storage applications. The cubic spinel phase of NCO is confirmed by powder X-ray diffraction pattern and field-emission scanning electron microscopy. Impedance spectroscopy studies...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2025-01-01
|
| Series: | ECS Sensors Plus |
| Online Access: | https://doi.org/10.1149/2754-2726/add8a1 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850233037166477312 |
|---|---|
| author | Khushboo Gupta Manish Kumar Mohit Verma O. P. Thakur |
| author_facet | Khushboo Gupta Manish Kumar Mohit Verma O. P. Thakur |
| author_sort | Khushboo Gupta |
| collection | DOAJ |
| description | This study investigates NiCo _2 O _4 (NCO) as a material for both the functional detection of NH _3 gas and for energy storage applications. The cubic spinel phase of NCO is confirmed by powder X-ray diffraction pattern and field-emission scanning electron microscopy. Impedance spectroscopy studies reveal dielectric properties including permittivity, AC conductivity, and resistance across a frequency range of 10 Hz –1 MHz and temperature from 305 K–473 K. The highest AC conductivity, 3.04 × 10 ^–3 S m ^−1 , was recorded at 473 K, while Nyquist plots indicate superior ionic conduction at lower temperatures. The electrochemical analysis highlights both faradic and pseudocapacitive charge storage mechanisms, with a specific capacitance (Cs) of 339.51 F g ^−1 at 2 A g ^−1 . Low ionic resistance (3.93 Ω) and charge-transfer resistance (8.36 Ω) emphasize NCO’s high capacitive behavior. The NH₃ sensing performance of NCO nanoparticles showed rapid response and recovery times of 20 s and 18.6 s, respectively, at 60 ppm concentration under room temperature conditions. Density functional theory suggests bandgap of 1.90 and 0.44 eV for spin-up and spin-down states. The QC of 931 μF cm ^−2 is calculated at −0.73 V using the density of states which confirms the potential of NCO for energy storage applications. These combined experimental and theoretical findings underscore the dual-functional nature of NCO for integrated gas sensing and energy storage technologies. |
| format | Article |
| id | doaj-art-393aaa481382419789c5d1ed9b6df35b |
| institution | OA Journals |
| issn | 2754-2726 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | ECS Sensors Plus |
| spelling | doaj-art-393aaa481382419789c5d1ed9b6df35b2025-08-20T02:03:00ZengIOP PublishingECS Sensors Plus2754-27262025-01-014202360110.1149/2754-2726/add8a1Investigations on Gas Sensing and Energy Storage Applications of NiCo2O4Khushboo Gupta0Manish Kumar1https://orcid.org/0000-0003-1213-4025Mohit Verma2O. P. Thakur3Materials Analysis and Research Laboratory, Department of Physics, NSUT, Dwarka, New Delhi 110078, IndiaExperimental Research Laboratory, Department of Physics, ARSD College, University of Delhi , Dhaula Kuan, New Delhi 110021, IndiaSchool of Physical Sciences, Indian Institute of Technology Mandi , H.P. 175005, IndiaMaterials Analysis and Research Laboratory, Department of Physics, NSUT, Dwarka, New Delhi 110078, IndiaThis study investigates NiCo _2 O _4 (NCO) as a material for both the functional detection of NH _3 gas and for energy storage applications. The cubic spinel phase of NCO is confirmed by powder X-ray diffraction pattern and field-emission scanning electron microscopy. Impedance spectroscopy studies reveal dielectric properties including permittivity, AC conductivity, and resistance across a frequency range of 10 Hz –1 MHz and temperature from 305 K–473 K. The highest AC conductivity, 3.04 × 10 ^–3 S m ^−1 , was recorded at 473 K, while Nyquist plots indicate superior ionic conduction at lower temperatures. The electrochemical analysis highlights both faradic and pseudocapacitive charge storage mechanisms, with a specific capacitance (Cs) of 339.51 F g ^−1 at 2 A g ^−1 . Low ionic resistance (3.93 Ω) and charge-transfer resistance (8.36 Ω) emphasize NCO’s high capacitive behavior. The NH₃ sensing performance of NCO nanoparticles showed rapid response and recovery times of 20 s and 18.6 s, respectively, at 60 ppm concentration under room temperature conditions. Density functional theory suggests bandgap of 1.90 and 0.44 eV for spin-up and spin-down states. The QC of 931 μF cm ^−2 is calculated at −0.73 V using the density of states which confirms the potential of NCO for energy storage applications. These combined experimental and theoretical findings underscore the dual-functional nature of NCO for integrated gas sensing and energy storage technologies.https://doi.org/10.1149/2754-2726/add8a1 |
| spellingShingle | Khushboo Gupta Manish Kumar Mohit Verma O. P. Thakur Investigations on Gas Sensing and Energy Storage Applications of NiCo2O4 ECS Sensors Plus |
| title | Investigations on Gas Sensing and Energy Storage Applications of NiCo2O4 |
| title_full | Investigations on Gas Sensing and Energy Storage Applications of NiCo2O4 |
| title_fullStr | Investigations on Gas Sensing and Energy Storage Applications of NiCo2O4 |
| title_full_unstemmed | Investigations on Gas Sensing and Energy Storage Applications of NiCo2O4 |
| title_short | Investigations on Gas Sensing and Energy Storage Applications of NiCo2O4 |
| title_sort | investigations on gas sensing and energy storage applications of nico2o4 |
| url | https://doi.org/10.1149/2754-2726/add8a1 |
| work_keys_str_mv | AT khushboogupta investigationsongassensingandenergystorageapplicationsofnico2o4 AT manishkumar investigationsongassensingandenergystorageapplicationsofnico2o4 AT mohitverma investigationsongassensingandenergystorageapplicationsofnico2o4 AT opthakur investigationsongassensingandenergystorageapplicationsofnico2o4 |