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21. Conclusion and the Road Ahead

Author

Marjit, Sugata, Mandal, Biswajit, Nakanishi, Noritsugu, Yanagawa, Takashi, Series Editor, Marjit, Sugata, Mandal, Biswajit, and Nakanishi, Noritsugu

Published
2020
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34. Introduction

Author

Marjit, Sugata, Mandal, Biswajit, Nakanishi, Noritsugu, Yanagawa, Takashi, Series Editor, Marjit, Sugata, Mandal, Biswajit, and Nakanishi, Noritsugu

Published
2020
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36. Priority Based GTS Allocation in Zigbee Wireless Sensor Network

Author

Ghosh, Soumik, Ghosh, Ekata, Banerje, Indrajit, Kundu, Debajyoti, Mandal, Biswajit, Filipe, Joaquim, Editorial Board Member, Ghosh, Ashish, Editorial Board Member, Prates, Raquel Oliveira, Editorial Board Member, Zhou, Lizhu, Editorial Board Member, Kar, Nirmalya, editor, Saha, Ashim, editor, and Deb, Suman, editor

Published
2020
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43. Defect-Rich SnO₂–x Polydisperse Spheres Toward the Detection of Vehicle-Emitted Category NO₂ Gas

Author

Mandal, Biswajit, Bhunia, Amit Kumar, Mahata, Bidesh, Roy, Souradeep, Acharyya, Snehanjan, and Guha, Prasanta Kumar

Abstract

Detection of vehicle-emitted type NO2 by metal oxides-based sensors remains challenging due to their unsatisfactory selectivity and high detection limit. In this work, we report using SnO2 polydisperse spheres (PSs) with enriched defects for the detailed sensing study of vehicle-emitted type gases. The XPS study of the SnO2 PSs reveals defects in the form of oxygen vacancy (OV) and unreacted Sn atoms (Sn0). Sensing results suggest that these defects played a crucial role in getting a very high response to NO2 (i.e., 22–1 ppm NO2) as well as a fast response time (68 s), which is further shortened to 9 s when exposed to 20 ppm NO2. Our sensor’s detection limit is 200 ppb, well covered for monitoring vehicle-emitted NO2 gas concentration (500 ppb to a few ppm). Furthermore, the selectivity study revealed that the sensor does not respond or respond negligibly to other vehicle-emitted gases like CO2 and CO, which shows the sensor’s exceptional selectivity to NO2. Finally, a comparative study shows that our sensor’s performance surpasses most previous reports on NO2 sensors, especially for detecting vehicle-emitted category NO2 gas.

Published
2024
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46. Surfactant effect on energy storage performance of hydrothermally synthesized Ni3V2O8.

Author

Mandal, Biswajit, Singh, Jay, Raha, Himadri, Mishra, Vipul Vaibhav, and Guha, Prasanta Kumar

Subjects
*ENERGY storage, *SUPERCAPACITOR electrodes, *CATIONIC surfactants, *SURFACE active agents, *ELECTRODE potential, *HYDROTHERMAL synthesis, *ANIONIC surfactants
Abstract

We report a study to improve the ternary oxide Ni3V2O8′s electrochemical energy storage capabilities through correct surfactanization during hydrothermal synthesis. In this study, Ni3V2O8 nanomaterials were synthesized in three different forms: one with a cationic surfactant (CTAB), one with an anionic surfactant (SLS), and one without any surfactant. FESEM study reveals that all the synthesized Ni3V2O8 nanomaterials had a small stone-like morphology. The electrochemical study showed that anionic surfactant-assisted Ni3V2O8 (NVSLS) had a maximum of 972 F g−1 specific capacitance at 1 A g−1 current density, whereas cationic surfactant-assisted Ni3V2O8 (NVCTAB) had the lowest specific capacitance of 162 F g−1. The specific capacitance and the capacitance retention of the NVSLS (85% after 4000 cycles) based electrode was much better than that of the NVCTAB (76% after 4000 cycles) based electrode. The improved energy storage properties of the NVSLS electrode are attributed to its high diffusion coefficient, high surface area, and enriched elemental nickel, as compared to the NVCTAB electrode. All these excellent electrochemical properties of NVSLS electrode indicates their potential usage in asymmetric supercapacitor application. [ABSTRACT FROM AUTHOR]

Published
2024
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47. Surfactant effect on energy storage performance of hydrothermally synthesized Ni3V2O8.

Author

Mandal, Biswajit, Singh, Jay, Raha, Himadri, Mishra, Vipul Vaibhav, and Guha, Prasanta Kumar

Subjects
ENERGY storage, SUPERCAPACITOR electrodes, CATIONIC surfactants, SURFACE active agents, ELECTRODE potential, HYDROTHERMAL synthesis, ANIONIC surfactants
Abstract

We report a study to improve the ternary oxide Ni3V2O8′s electrochemical energy storage capabilities through correct surfactanization during hydrothermal synthesis. In this study, Ni3V2O8 nanomaterials were synthesized in three different forms: one with a cationic surfactant (CTAB), one with an anionic surfactant (SLS), and one without any surfactant. FESEM study reveals that all the synthesized Ni3V2O8 nanomaterials had a small stone-like morphology. The electrochemical study showed that anionic surfactant-assisted Ni3V2O8 (NVSLS) had a maximum of 972 F g−1 specific capacitance at 1 A g−1 current density, whereas cationic surfactant-assisted Ni3V2O8 (NVCTAB) had the lowest specific capacitance of 162 F g−1. The specific capacitance and the capacitance retention of the NVSLS (85% after 4000 cycles) based electrode was much better than that of the NVCTAB (76% after 4000 cycles) based electrode. The improved energy storage properties of the NVSLS electrode are attributed to its high diffusion coefficient, high surface area, and enriched elemental nickel, as compared to the NVCTAB electrode. All these excellent electrochemical properties of NVSLS electrode indicates their potential usage in asymmetric supercapacitor application. [ABSTRACT FROM AUTHOR]

Published
2024
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