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Insights into the Plateau Capacity Dependence on the Rate Performance and Cycling Stability of a Superior Hard Carbon Microsphere Anode for Sodium-Ion Batteries

ACS Applied Energy Materials (IF 6.024 ) Publication Date: September 8, 2020 DOI: https://doi.org/10.1021/acsaem.0c01750 Author(s): Nagmani (IIT Kharagpur); Sreeraj Puravankara (IIT Kharagpur) The sodium-ion storage mechanism of the hard carbon microspheres (HCMSs) synthesized using the microwave technique from the sucrose precursor and a 50% DEG/H 2 O solvent mixture carbonized at 1000 °C (50DEG-HCMS) is studied. The superior sodium-ion battery (SIB) anode, 50DEG-HCMS delivers the highest reversible capacities of 385 (ICE ∼75.5%) and 265 mAh g –1 (ICE ∼72%) at current densities of 30 and 300 mA g –1 , respectively. The plateau related capacity (PRC) solely determines the reversible capacity fade on cycling at all C-rates for the HCMS, validating the insertion/pore-filling mechanism for the low voltage (< ∼0.1 V) capacity. In this study, we substantiate that maximizing PRC may not be the best strategy in designing a high rate, a highly cyclable carbon-based anode for SIBs. HCMS

Highly sensitive and selective H2S gas sensor based on TiO2 thin films

Applied Surface Science ( IF 6.707 ); Publication Date: February 9, 2021 DOI: https://doi.org/10.1016/j.apsusc.2021.149281 Author(s): Nagmani , D. Pravarthana, A Tyagi, T.C Jagadale, W. Prellier, D.K Aswal Abstract : Hydrogen Sulfide (H 2 S) gas sensors with very high sensitivity, selectivity, and quick responses are highly demanding for practical industrial applications. However, achieving it remains a challenging due to high-cost fabrication, poor selectivity, and stability of existing sensor materials. In this work, we report the nanocrystalline TiO 2 thin film based highly selective H 2 S sensor on a silicon substrate, which exhibits superior sensor response of ∼ 112000 % and ∼ 85 % at 50 ppm and 100 ppb concentration of H 2 S gas, respectively when operated at 100 ℃. Also, it exhibits quick response time (∼ 48 s) and fast recovery time (5 min) with long term stability in H 2 S gas sensing. The sensitivity of H 2 S gas on the TiO 2 film is related to its surface roughn

The Future of mobility is Electric (e-Mobility) for sustainable eco-system: Sodium-Ion Battery ( A Technology Beyond Lithium-Ion Battery)

Introduction to electric mobility – Battery on wheels Electric mobility in the 20 th century by Nagmani Transportation and vehicular mobility have been significant aspects of modern civilization, ensuring connectivity and facilitating socio-economical development. The majority of automobiles on the road today run with conventional fossil fuels like gasoline and diesel . In an Internal Combustion Engine (ICE), incomplete combustion results in greenhouse gas (GHG) emissions contributing to 25% of the total GHG emissions worldwide. As the global consensus grew, green and sustainable alternatives emerged towards the electrification of transportation sectors worldwide. However, electric vehicles (EVs) are historically older technologies as compared to ICE-based automobiles. 1 Battery-powered cars first appeared in the early 1800s, followed by electrified locomotives in the 1830s. 2 Patents were granted in England and America in 1840 and 1847 to use electrified rails. 3 Almost a

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