02394nas a2200301   4500008004100000022001400041245013200055210006900187260000800256300001200264490000800276520136300284653001501647653002201662653001901684653003401703653003401737653002901771100001801800700001801818700001801836700001901854700001901873700001401892700003001906700002501936856013101961       2020                        eng d  a0008-622300aRoom temperature processed in-situ carbon-coated vanadium carbide (VC@C) as a high capacity robust Li/Na battery anode material0 aRoom temperature processed insitu carboncoated vanadium carbide   cMAY  a108-1160 v1613 a<p>3D carbide systems with their robust physical and mechanical properties have always attracted multiple application interests. In this report, we have synthesized a three-dimensional in-situ carbon coated cubic carbide, Vanadium Carbide (VC@C), by a very simple, scalable and cost-effective room temperature mechano-chemical ball-milling procedure and researched its promise as effective anode material for Li and Na ion batteries. We have demonstrated that VC@C shows an impressive initial discharge/lithiation capacity of 1165 mAh g(-1) with a high reversible capacity of 640 mAh g(-1) after 100 charge-discharge cycles at an applied current density of 0.1 A g(-1). We have also found that this material renders a very promising rate performance with significantly low capacity drop after exposing it to variable current densities ranging from 0.05 A g(-1) to 2 A g(-1) with an excellent stability up to 1000 cycles owing to its structural robustness, as verified by post-cycling characterizations. A Li-ion full cell study using LiCoO2 as cathode also showed excellent promise in terms of practical application demonstrating a reversible capacity of 95 mAh g(-1) after 100 cycles. Even for Na insertion/de-insertion VC@C shows a clear promise in terms of capacity, cyclic stability and rate performance. (C) 2020 Elsevier Ltd. All rights reserved.</p>
10a3D carbide10aIn-situ synthesis10aLi-ion battery10aPost cycling characterization10aRoom temperature ball milling10aWilliamson-Hall analysis1 aMahajan, Mani1 aRoy, Kingshuk1 aParmar, Swati1 aSingla, Gourav1 aPandey, O., P.1 aSingh, K.1 aVaidhyanathan, Ramanathan1 aOgale, Satishchandra  uhttp://library.ncl.res.in/content/room-temperature-processed-situ-carbon-coated-vanadium-carbide-vcc-high-capacity-robust-lina02284nas a2200181   4500008004100000022001400041245014300055210006900198260000800267300001400275490000700289520159000296100001901886700002801905700001801933700002401951856012701975       2021                        eng d  a2040-336400aFacile synthesis of CNT interconnected PVP-ZIF-8 derived hierarchically porous Zn/N co-doped carbon frameworks for oxygen reduction dagger0 aFacile synthesis of CNT interconnected PVPZIF8 derived hierarchi  cMAR  a6248-62580 v133 a<p>In this work, a strategy has been adopted to construct an architecture through the coordination of polyvinylpyrrolidone (PVP) and a monodisperse zeolitic imidazolate framework (ZIF-8), which was entwined by carbon nanotubes (CNTs) firstly, followed by a pyrolysis process to obtain the hybrid catalyst. The meticulous design of the hybrid material using CNTs to interconnect the PVP assisted ZIF-8 derived porous carbon frameworks together produces a hierarchical pore structure and dual-heteroatom (Zn/N) doping (Zn-N/PC@CNT). Without further acid treatment, the hybrid material prepared after pyrolysis at 900 degrees C (PVP-ZIF-8@CNT-900) has been demonstrated as an efficient non-precious metal catalyst for the oxygen reduction reaction (ORR) with its superior stability compared to the commercial 20 wt% Pt/C catalyst in alkaline media. The catalyst shows better performance towards the ORR, with its more positive onset and half-wave potentials (E-onset = 0.960 V vs. RHE and E-1/2 = 0.795 V vs. RHE) than the counterpart system which is free of both CNT and PVP. The high performance of the hybrid catalyst can be ascribed to the co-existence of dual-active sites with hierarchical pore structures originating from the synergistic effects between Zn/N co-doped porous carbon and CNTs. We further demonstrated the single-cell performance by using the homemade system as the cathode catalyst for the Alkaline Exchange Membrane Fuel Cell (AEMFC) system, which showed a maximum power density of 45 mW cm(-2) compared to 60 mW cm(-2) obtained from the 40 wt% Pt/C catalyst.</p>
1 aSingla, Gourav1 aBhange, Siddheshwar, N.1 aMahajan, Mani1 aKurungot, Sreekumar  uhttp://library.ncl.res.in/content/facile-synthesis-cnt-interconnected-pvp-zif-8-derived-hierarchically-porous-znn-co-doped