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Sindhuja Manoharan(마노하란 신드후자),Karthikeyan Krishnamoorthy(케이 카티케이얀),Vimal Kumar Mariappan(비말 구말 마리아판),Sang-Jae Kim(김상재) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
Self-charging supercapacitor power cell (SCSPC) attains great attention owing to their ability to harvest-, convert-, and store- energy in a single device. The current limitations in the SCSPC are the use of liquid electrolytes since they lead to poor energy conversion efficiency. Therefore, the designing alternate electrolyte for applications in SCSPC is of great demand. Herein, we are reporting the use of novel piezo-electrolyte film comprising solid electrolyte ((phosphotungstic acid (PTA)) incorporated in piezoelectric PVDF matrix as a new separator for SCSPC. The formation of PTA-PVDF piezo-electrolyte films was characterized using X-ray diffraction, field-emission scanning electron micrograph, elemental mapping, and Raman analysis demonstrating the uniform distribution of the PTA electrolyte in the PVDF matrix. The inclusion of PTA in the PVDF matrix leads to enhanced mechanical to electric energy transduction properties as well as improved ionic conductivity. Finally, a graphene based SCSPC fabricated using PTA-PVDF piezo-electrolyte film as separators showed that they can self-charge upto 110 mV when subjected to an external force of 2 N. The self-charging process occurred in fabricated SCSPC device was explained using piezo-electrochemical energy conversion pathways. These studies open new arena in the development of next-generation integrated energy devices.
Dhanasekar Kesavan(케사반 다나셰이커),Karthikeyan Krishnamoorthy(케이 카티케 이얀),Sindhuja Manoharan(마노하란 신드후자),Sang-Jae Kim(김상재) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
In this work, we investigated the electrochemical properties of boron-oxy-carbide (BOC) nanostructures prepared via simple hydrothermal assisted carbonization technique. Physico-chemical characterization such as XRD analysis confirmed the formation of BOC nanostructures with the presence of boron suboxides confined in carbon matrix. The field-emission scanning electron microscopic analysis coupled with EDX analysis reveals the formation of cone-like BOC nanostructure with uniform distribution of boron, oxygen, and carbon elements. The electrochemical properties of the BOC electrode are investigated in aqueous electrolyte (1M Li<sub>2</sub>SO<sub>4</sub>), which shows enhanced operating potential of 2.0 V (-1.0 to 1.0 V). The CV shows quasi rectangular shaped profiles at all scan rates portraying the charge storage is due to combination of electric double layer and intercalation capacitance occurred at BOC electrode. The BOC electrode possess a high specific capacitance of 230.5 F g<sup>-1</sup> at a constant current of 1 mA with better electrochemical stability. Benefiting from the unique structural features and embedment of free carbon phase, the BOC nanostructures exhibits excellent electrochemical properties compared to the state of art of supercapacitors.
Parthiban Pazhamalai(파자말라이 파르티반),Karthikeyan Krishnamoorthy(케이 카티케 이얀),Sindhuja Manoharan(마노하란 신드후자),Sang-Jae Kim(김상재) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
Self-charging supercapacitor power cell (SCSPC) is one of the nascent areas of research for the surrogating to renewable energy resources. The prime obstacle in development SCSPC is the utilization of liquid electrolyte hinders the energy conversion efficiency which in turn creates a demand to explore and replace with new solid electrolytes for the SCSPCs. Herein, a new all solid state self-charging supercapacitor power cell (SCSPC) has been fabricated using Nafion as solid polyelectrolyte cum energy harvester and spray coated MoS2 quantum sheets (MoS2-QSs) as energy storage electrodes. The Nafion polyelectrolyte exhibits energy harvesting characteristics under mechanical deformation due to the change in ion concentration gradients between electrodes that leads to the generation of output voltage. The fabricated MoS2-Nafion-MoS2 SCSPC shows the self-charging characteristics upon various levels of compressive forces with a self-charging voltage of 243 mV. The self-charging mechanism of the fabricated MoS2-Nafion-MoS2 SCSPC is explained via piezo-ionic effect. These experimental findings have profound significance in the context of developing a potential all-in-one self-charging system.
Electrodeposited Stanene on Ni foam for Hydrogen Cvolution Reaction
Aparna Sajeev(아파르나 사지브),Karthikeyan Krishnamoorthy(케이 카티케이얀),Vimal Kumar Mariappan(비말 구말 마리아판),Parthiban Pazhamalai(파자말라이 파르티반),Sindhuja Manoharan(마노하란 신드후자),Sang-Jae Kim(김상재) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
Hydrogen is a clean green fuel with zero carbon emission and is a potential candidate for the replacement of traditional fossil fuel. The electrochemical hydrogen production through water electrolyzer is one of the promising way to meet the growing renewable energy demand in the global society. In this work, we demonstrated the electrodeposition of binder free stanine on Ni foam for various time interval and analysed their electrocatalytic activity towards hydrogen evolution reaction. Physico-chemical characterization such as X-ray, diffraction, Raman and FESEM analysis confirmed the formation of the stanene on the Ni foam. The electrochemical characterization such as linear sweep voltammetry, chronoamperometry and electrochemical impedance spectroscopy was performed using binder free stanene coated on Ni foam. The obtained results exhibit better catalytic activity towards hydrogen evolution reaction in alkaline.
Carbyne Enriched Carbon: A Maintenance-free Self-charging System
Vimal Kumar Mariappan(비말 구말 마리아판),Karthikeyan Krishnamoorthy(케이 카티케이얀),Parthiban Pazhamalai(파자말라이 파르티반),Sindhuja Manoharan(마노하란 신드후자),Sang-Jae Kim(김상재) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
Self-powered system (SPS) will be the promising power source in this modern era where the customized electronics gadgets are ruling the world. However, the impedance matching (energy harvester and storage), high-cost, and long-time durability of SPS in the previous report stop them from further development towards commercialization. The development of new materials with the property of both energy harvesting and storage is the utmost importance to extend the application of SPS. In this work, we report the bifunctional properties of free-standing paper-like carbyne-enriched carbon (P-CeC) as both energy harvester (triboelectric nanogenerator) and storage unit (supercapacitor) in the formulated SPS unit as a first report. The changes in the work function & surface potential of P-CeC film were carefully investigated using KPFM and UPS study. The fabricated C-CeC TENG shows far superior performance compared to the state of art of the polymer-based TENG. In addition, the energy storage performance of P-CeC SSC was systematically studied and evaluated. Finally, the self-charging capability of this P-CeC SPS is demonstrated, which charge 750 mV (380s) with energy storing efficiency of 93.75 %. This result shows that the development of bifunctional materials has great potential for the maintenance-free system towards customized electronics gadgets.