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

Applied Surface Science ( IF 7.392 ); 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

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 6.959 ) 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

Opportunities in Na/K [Hexacyanoferrate] Frameworks for Sustainable Non-aqueous Na+/K+ batteries

Sustainable Energy & Fuels (Royal Society of Chemistry), ( IF 6.813 ) , Accepted Date: December 03, 2021 Review Article DOI: https://doi.org/10.1039/D1SE01653A Author(s): Ashwani Tyagi , Nagmani , Sreeraj Puravankara . Abstract: In the past decade, the most sought cathode materials for SIBs and PIBs include transition metal oxides (TMOs), polyanionic phosphates and fluoro phosphates, NASICON-type polyanionic compounds, and alkali metal hexacyanoferrates (AMHCFs/PBAs). From the commercialization perspective, Novasis Energies, Inc. and Faradion Ltd. have successfully used AMHCFs and TMOs as cathode materials, respectively, for large-scale energy storage in sodium-ion batteries (SIBs). The open framework voids (~ 3.4 Å) in AMHCFs are ideal for the larger K+/Na+ ion insertion in PIBs and SIBs. Lower cost/performance ratio due to cheaper raw materials and sustainability due to Coloumbically efficient cycling stability make AMHCFs ideal cathode materials for sustainable future batte

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