Journal of New Materials for Electrochemical Systems 2021-07-12T15:18:28-04:00 K. OISHI Open Journal Systems Scientific journal related to new materials, nano materials, energy materials and others related to electrochemistry and energy Optimal Performance Evaluation of Energy Efficient Residential Air Conditioning System with Nanofluid-based Intercooler using Taguchi-based Response Surface Methodology 2021-07-12T15:18:28-04:00 Balaji Navaneethakrishnan N. Nithyanandan R. Adalarasan M. Santhanakumar P. Suresh Mohan Kumar <p><em>Air conditioning is viewed as a major energy consuming area in domestic and industrial applications. However energy conservation is effectively possible in air conditioners by employing an intercooler with nanofluids, which can consequently reduce the compressor load. This paper presents an investigative report on the performance of proposed energy efficient air conditioning system. A binary mixture of ethylene glycol (C<sub>2</sub>H<sub>6</sub>O<sub>2</sub>) and water is used as the base fluid in the shell and coil type heat exchanger (SCHE). The volume concentration of C<sub>2</sub>H<sub>6</sub>O<sub>2</sub> in base fluid, type of suspended nano particles (Al<sub>2</sub>O<sub>3</sub> and MgO), flow rate of nanofluid at shell side of intercooler and the volume fraction of nano particles are chosen for experimentation designed using Taguchi L<sub>18</sub> orthogonal array. The coefficient of performance (COP) of the nanofluid-based domestic air conditioner is estimated as the performance index (response). Quadratic model and response surface plots are generated to observe the effects of inputs on the COP. The nano particles of MgO (0.75%v/v), suspended in a binary mixture with 28.65% C<sub>2</sub>H<sub>6</sub>O<sub>2</sub> is found to improve the system performance (COP) at a nanofluid flow rate of 2.42 LPM.</em></p> 2018-07-31T00:00:00-04:00 ##submission.copyrightStatement## PVF-PPy Composite as Support Material for Facile Synthesis of Pt@PVF-PPy Catalyst and Its Electrocatalytic Activity Towards Formic Acid Oxidation 2021-07-12T15:18:25-04:00 Mutlu Sönmez Çelebi Ayşe Nur Yılmaz <p>Preparation and characterization of a Pt-based catalyst supported on poly(vinylferrocenium)-poly(pyyrole) conducting polymer composite (Pt@PVF-PPy) was described for electrocatalytic oxidation of formic acid. Pt precursor was aqueous solution of K<sub>2</sub>PtCl<sub>4</sub> and electrochemical and chemical reduction methods were compared for optimum catalyst performance. Other experimental parameters such as polymer film thickness and Pt loading were also optimized with respect to the formic acid oxidation peak current values. Scanning electron microscopy, cyclic voltammetry and chronoamperometry methods were used for physical and electrochemical characterization of the catalyst system. When compared with similar Pt-based conducting polymer supported catalyst systems, the Pt@PVF-PPy catalyst revealed superior performance for formic acid electrooxidation.</p> 2018-07-31T00:00:00-04:00 ##submission.copyrightStatement## Surfactant-assisted Pulse Electrodeposition of Hausmannite Nano-rods/particles with Improved Pseudocapacitive Performance 2018-08-29T18:34:27-04:00 Mustafa Aghazadeh <p>Pulse cathodic electrodeposition of manganese oxide was performed from 0.005M MnCl<sub>2</sub> in the presence of cetyl trimethylammonium bromide (CTAB). The electrosynthesis experiments were done at the simple pulse mode (t<sub>on</sub>=1ms and t<sub>off</sub>=1ms) with applying current density of 10 mA cm<sup>–2</sup>. The structural analyses through XRD and FTIR revealed that the prepared sample have the pure hausmannite crystal structure. Morphological observations by SEM showed that the deposited hausmannite has mixed rod/particle morphology. The charge storage performances of the prepared hausmannite were evaluated by cyclic voltammetry and charge-discharge techniques. The Mn<sub>3</sub>O<sub>4 </sub>working electrode exhibited only 13% capacity decay after 1000 cycles at the current load of 2 A g<sup>–</sup><sup>1</sup>, and its SC value reduced from 239 F g<sup>–</sup><sup>1</sup> to 207 F g<sup>–</sup><sup>1</sup>. The results proved that the prepared Mn<sub>3</sub>O<sub>4</sub> nano-rods/particles are suitable electrode material for supercapacitors.</p> 2018-08-15T00:00:00-04:00 ##submission.copyrightStatement## Heavy Metals in Philippine Rice (Oryza Sativa) using Nafion- [Ru(bpy)3]2+-Gold Nanoparticles Modified Glassy Carbon Electrodes 2021-07-12T15:18:21-04:00 S. Palisoc C. Canquin M. Natividad <p>Nafion-Ru(bpy)<sub>3</sub><sup>2+</sup>-Gold Nanoparticles (AuNPs) modified glassy carbon electrodes were fabricated and were used in detecting heavy metals in Philippine rice samples by differential pulse voltammetry (DPV). The said electrodes were fabricated via the drop coating technique. The concentrations of the modifiers, Ru(bpy)<sub>3</sub><sup>2+</sup> and AuNPs, were varied to determine the best electrode for detecting lead, cadmium, and copper. Based on DPV results, the electrode with 5 mg Ru(bpy)<sub>3</sub><sup>2+</sup> and 3 mg AuNPs was chosen as the best electrode. The calibration curves of the best electrode showed strong correlation values of 0.9984 for lead, 0.9905 for cadmium, and 0.9933 for copper. The limit of detection for lead, cadmium, and copper were 10 mg/L, 10 mg/L, and 200 mg/L, respectively. Atomic absorption spectrometry was used as a cross reference to verify the results from DPV. The lead and cadmium content of all the rice samples exceeded the World Health Organizaton (WHO) limit that the body can take. Some samples contained copper above the WHO limit.</p> 2018-08-14T00:00:00-04:00 ##submission.copyrightStatement##