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Inamdar, Akbar I.,Ahmed, Abu Talha Aqueel,Chavan, Harish S.,Jo, Yongcheol,Cho, Sangeun,Kim, Jongmin,Pawar, Sambhaji M.,Hou, Bo,Cha, SeungNam,Kim, Hyungsang,Im, Hyunsik Elsevier 2018 CERAMICS INTERNATIONAL Vol.44 No.15
<P><B>Abstract</B></P> <P>The temperature-dependent performance of a Li<SUB>2</SUB>ZnTi<SUB>3</SUB>O<SUB>8</SUB> (LZTO) anode and the ultrafast-charging activity of a Li-ion battery were investigated. The LZTO anode operates at different temperatures between − 5 and 55 °C and in this work its sustainability is discussed in terms of storage performance. It delivered a discharge capacity of 181.3 mA h g<SUP>−1</SUP> at 25 °C, which increased to 227.3 mA h g<SUP>−1</SUP> at 40 °C and 131.2 mA h g<SUP>−1</SUP> at − 5 °C. The variation in the discharge capacity with temperature is associated with the reaction kinetics and the change in internal resistance. It showed a capacity retention of 64% and a coulombic efficiency of 98% over 500 cycles. Exhibiting a discharge capacity of 107 mA h g<SUP>−1</SUP>, the LZTO anode was sustainable over 100 charge-discharge cycles at an ultra-high charging rate of 10 Ag<SUP>−1</SUP>. The reaction kinetics estimated from a cyclic voltammetry analysis at high scan rates revealed a capacitive-type storage mechanism.</P> <P><B>Graphical abstract</B></P> <P>We developed an ultrafast rechargeable Li<SUB>2</SUB>ZnTi<SUB>3</SUB>O<SUB>8</SUB> (LZTO) anode for lithium-ion batteries. A half-cell LZTO battery delivered the highest reversible first discharge capacity of 181.3 mA h g<SUP>−1</SUP> at a current rate of 0.1 Ag<SUP>−1</SUP> and the maximum capacity of 106.97 mA h g<SUP>−1</SUP> was obtained when charged at an ultrafast charging rate of 10.0 Ag<SUP>−1</SUP>. The LZTO showed an excellent capacity-retention of 106.28%, suggesting excellent electrode sustainability, even at ultra-high-charging rates.</P> <P>[DISPLAY OMISSION]</P>
Inamdar, Akbar I.,Chavan, Harish.S.,Ahmed, Abu Talha Aqueel,Cho, Sangeun,Kim, Jongmin,Jo, Yongcheol,Pawar, Sambhaji M.,Park, Youngsin,Kim, Hyungsang,Im, Hyunsik North-Holland 2018 Materials Letters Vol. No.
<P><B>Abstract</B></P> <P>Nanogranular tungsten oxide (WO<SUB>3</SUB>) with excess oxygen is synthesized and its battery performance is evaluated as an anode material for the Li-ion battery (LIB). The formation of a monoclinic WO<SUB>3</SUB> phase is confirmed using X-ray diffraction (XRD) and micro (µ)-Raman spectroscopy analyses. The Rutherford back scattering results confirm the existence of excess oxygen in the film. The charge discharge processes are associated with the conversion of the WO<SUB>3</SUB> from the oxide state to the metallic state, and vice versa, and it shows a maximum specific capacity of 778.8 mAh g<SUP>−1</SUP> at a current density of 0.1 Ag<SUP>−1</SUP> in the first discharge. Even at a very high current density of 1 Ag<SUP>−1</SUP>, the sample retains the capacity of 228.6 mAh g<SUP>−1</SUP>. It shows excellent rate capability and a long-term cycling stability over 500 charge–discharge cycles, with capacity retention of 217%. The observed high discharge capacity and superior long-term cyclability of the nanograin WO<SUB>3</SUB> anode are attributable to the synergetic effect of the excess-oxygen induced increased donor density and enhanced electrical conductivity.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Nanogranular WO<SUB>3</SUB> with excess oxygen is synthesized as an anode material for LIB. </LI> <LI> A maximum specific capacity of ∼779 mAh g<SUP>−1</SUP> and excellent rate capability are observed. </LI> <LI> Long-term cycling stability over 500 charge–discharge cycles with high capacity retention of 217% is obtained. </LI> <LI> Capacity retention of ∼229 mAh g<SUP>−1</SUP> at a very high current density of 1 Ag<SUP>−1</SUP> is achieved. </LI> </UL> </P>
Inamdar, Akbar I.,Kim, Jongmin,Jo, Yongcheol,Woo, Hyeonseok,Cho, Sangeun,Pawar, Sambhaji M.,Lee, Seongwoo,Gunjakar, Jayavant L.,Cho, Yuljae,Hou, Bo,Cha, SeungNam,Kwak, Jungwon,Park, Youngsin,Kim, Hyun North-Holland 2017 Solar Energy Materials and Solar Cells Vol. No.
<P><B>Abstract</B></P> <P>A smart supercapacitor shares the same electrochemical processes as a conventional energy storage device while also having electrochromic functionality. The smart supercapacitor device can sense the energy storage level, which it displays in a visually discernible manner, providing increased convenience in everyday applications. Here, we report an electro-optically tunable smart supercapacitor based on an oxygen-rich nanograin WO<SUB>3</SUB> electrode. The nanostructured WO<SUB>3</SUB> electrode is dark blue in color in the charged state and becomes transparent in its discharged state with a high optical modulation of 82%. The supercapacitor has a specific capacitance of 228Fg<SUP>−1</SUP> at 0.25 Ag<SUP>−1</SUP> with a large potential window (1.4V). It is highly durable, exhibits good electrochemical stability over 2000 cycles, retains 75% of its initial capacitance, and exhibits high coloration efficiency (~170cm<SUP>2</SUP>/C). The excellent electrochromic and electrochemical supercapacitor properties of the electrode is due to the synergetic effect between nanograin morphology and excess oxygen. A smart-supercapacitor fabricated with an oxygen-rich nanograin WO<SUB>3</SUB> electrode exhibits a superb combination of energy storage and highly-efficient electrochromic features in one device that can monitor the energy storage level through visible changes in color.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Oxygen-excess nanograin WO<SUB>3+δ</SUB> is synthesized for a smart supercapacitor electrode. </LI> <LI> It is dark blue in the charged state and transparent in the discharged state with an optical modulation of 82%. </LI> <LI> The device exhibits an excellent coloration efficiency of ~170cm<SUP>2</SUP>/C. </LI> <LI> The specific capacity is 228Fg<SUP>−1</SUP> with a large potential window of 1.4V. </LI> </UL> </P>
Mesoporous Ni-PANI composite electrode for electrochromic energy storage applications
Inamdar, Akbar I.,Chavan, Harish S.,Kim, Hyungsang,Im, Hyunsik Elsevier 2019 Solar energy materials and solar cells Vol.201 No.-
<P><B>Abstract</B></P> <P>Nanostructured mesoporous Ni-PANI thin film electrodes are fabricated on indium-doped tin oxide (ITO) conducting glass substrates using a pulse potential electro-polymerization technique. The Ni-PANI film is amorphous in nature and exhibits a mesoporous cauliflower like morphology. The multifunctional characteristics of Ni-PANI as an electrode for a smart supercapacitor are investigated using electrochemical and optical techniques in 0.5 M LiClO<SUB>4</SUB> +PC electrolyte. It is dark blue when it is charged at 0.7 V (vs SCE), and it is transparent when it is discharged at −0.7 V (vs SCE). Moreover, it can exhibit other colours like sky blue and parrot green in intermediate states. Specific discharge capacitance of 543 Fg<SUP>−1</SUP> and 267 Fg<SUP>−1</SUP> at a current density of 1 Ag<SUP>−1</SUP> is obtained for Ni-PANI and pure PANI respectively. The observed colouration efficiency is 45.9 cm<SUP>2</SUP>C<SUP>−1</SUP> for Ni-PANI and 35.1 cm<SUP>2</SUP>C<SUP>−1</SUP> for pure PANI at a wavelength of 630 nm. An outstanding optical modulation of 55.6% with a capacity retention of 90% after 5000 cycles is obtained for Ni-PANI electrode. The robust synthesis of Ni-PANI electrodes with efficient smart supercapacitor activity can be used as alternative materials in smart energy storage devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The NiO<SUB>x</SUB>-PANI exhibited multifunctional activity as energy storage and electrochromism. </LI> <LI> It is capable of sensing colour with respect to the level of energy stored. </LI> <LI> The device exhibits a colouration efficiency of 45.9 cm<SUP>2</SUP>C<SUP>-1</SUP> with an optical modulation of 55.6%. </LI> <LI> The high specific capacity is 543 F g<SUP>−1</SUP>, with a large potential window of 1.3 V. </LI> </UL> </P>
Sankar, S.,Inamdar, Akbar I.,Im, Hyunsik,Lee, Sejoon,Kim, Deuk Young Elsevier 2018 CERAMICS INTERNATIONAL Vol.44 No.14
<P><B>Abstract</B></P> <P>Spherical MnO<SUB>2</SUB> nanoparticles were synthesized at room temperature <I>via</I> template-free sonochemical reduction of potassium permanganate using a reducing agent of polyethylene glycol under two different time durations (<I>i.e.</I>, 15 min (M1) and 30 min (M2)). The M2 sample exhibited the α-phase of the tetragonal MnO<SUB>2</SUB> structure, whereas the M1 sample showed the δ-MnO<SUB>2</SUB> phase. For microstructural analyses, the M2 sample revealed a spherical structure of the nanoparticles with an average grain size of 20–30 nm. When using spherical MnO<SUB>2</SUB> nanoparticles (<I>i.e.</I>, M2) as an electrode material for the supercapacitor device, the maximum specific capacitance of 136 F/g was observed at the current density of 0.5 A/g. The device displayed an excellent cyclic stability of 72% after 5000 charge/discharge cycles, and showed a high energy density up to 38.3 Wh/kg. These results suggest that the sonochemically-synthesized spherical MnO<SUB>2</SUB> nanoparticles could be used as a suitable electrode material for high-energy electrochemical supercapacitors.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Pawar, Sambhaji M.,Inamdar, Akbar I.,Gurav, Kishor V.,Shin, Seung Wook,Gwak, Jihye,Jo, Yongcheol,Yun, JaeHo,Pak, Hisun,Kwon, Sehan,Kim, Hyungsang,Kim, Jin Hyeok,Im, Hyunsik Elsevier 2015 Current Applied Physics Vol.15 No.2
<P>We have synthesized an efficient Cu2ZnSn(SxSe1-x)(4) (CZTSSe) absorbers by using single-step rapid thermal sulfo-selenization process of sputtered stack metallic precursor (Zn/Sn/Cu) films. The structural and morphological studies confirm that the suitability of the rapid thermal sulfo-selenization process for the synthesis of a CZTSSe absorber without any secondary phases with large grains. The annealing atmosphere with a mixed-chalcogen source enhances the grain growth of the CZTSSe absorber as compared with pure Cu2ZnSnS4 (CZTS) and Cu2ZnSnSe4 (CZTSe) absorbers. The CZTSSe thin film solar cell shows the best conversion efficiency of similar to 7%. (C) 2014 Elsevier B. V. All rights reserved.</P>
Pawar, Sambhaji M.,Pawar, Bharati S.,Hou, Bo,Kim, Jongmin,Aqueel Ahmed, Abu Talha,Chavan, Harish. S.,Jo, Yongcheol,Cho, Sangeun,Inamdar, Akbar I.,Gunjakar, Jayavant L.,Kim, Hyungsang,Cha, SeungNam,Im, The Royal Society of Chemistry 2017 Journal of materials chemistry. A, Materials for e Vol.5 No.25
<P>A high activity of a two-dimensional (2D) copper oxide (CuO) electrocatalyst for the oxygen evolution reaction (OER) is presented. The CuO electrode self-assembles on a stainless steel substrate<I>via</I>chemical bath deposition at 80 °C in a mixed solution of CuSO4and NH4OH, followed by air annealing treatment, and shows a 2D nanosheet bundle-type morphology. The OER performance is studied in a 1 M KOH solution. The OER starts to occur at about 1.48 V<I>versus</I>the RHE (<I>η</I>= 250 mV) with a Tafel slope of 59 mV dec<SUP>−1</SUP>in a 1 M KOH solution. The overpotential (<I>η</I>) of 350 mV at 10 mA cm<SUP>−2</SUP>is among the lowest compared with other copper-based materials. The catalyst can deliver a stable current density of >10 mA cm<SUP>−2</SUP>for more than 10 hours. This superior OER activity is due to its adequately exposed OER-favorable 2D morphology and the optimized electronic properties resulting from the thermal treatment.</P>
라즈쿠마파텔,Akbar I. Inamdar,Bo Hou,차승남,Abu Talha Ansari,Jayavant L. Gunjakar,임현식,김형상 한국물리학회 2017 Current Applied Physics Vol.17 No.4
A nanofoam nickel cobalt layered double hydroxide (NiCo(OH)2) electrode film is fabricated on a stainless-steel substrate with the use of a simple one-step solvothermal process. The nanofoam NiCo( OH)2 electrode exhibits a high specific capacitance of 2710.2 F/g at a current density of 9.1 A/g, and a good capacity retention of ~70% after 2000 charge-discharge cycles at a high current density of 31.8 A/g. An energy density of 60.23 Wh/kg is obtained at a power density of 1.8 kW/kg. The excellent electrochemical energy storage performance of the NiCo(OH)2 electrode is due to the synergetic effect of a significantly improved ionic diffusion and an effective charge transfer, which is linked to a well-dispersed interconnected nanofoam morphology and binder-free direct contact with the current collector.
Rajkumar Patel,Akbar I. Inamdar,Hyungbae Kim,Hyunsik Im,Hyungsang Kim 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.68 No.11
A molybdenum disulfide (MoS2) nanosheet film was grown directly on a stainless-steel substrate by using an in-situ hydrothermal growth technique at 200 C. The formation of an MoS2 hexagonal structure with a nanosheet-like morphology was confirmed by using X-ray diffraction (XRD) and field-emission scanning electron microscopy (FE-SEM) while a layered MoS2 nanosheet structure was observed under an energy-filtering transmission electron microscope (EF-TEM). The electrochemical supercapacitor properties of the MoS2 nanosheet electrode were measured in 1-M aqueous Na2SO4 electrolyte by using cyclic voltammetry (CV) and charge/discharge technique, and the electrode’s specific capacitances were 91.29 F/g and 146.15 F/g, respectively. The concurrent double-layer capacitance and pseudo-capacitance behaviors of the electrode manifested themselves in the rectangular shape and redox peaks of the CV curve. The mesoporous MoS2 nanosheets were electrochemically stable for up to 1000 charge/discharge cycles.