This research work undertook a comparative study of the promoting effects graphene in TiO 2 photoanodes. The aim this was to investigate types and concentration reduced oxides (rGO) on structure properties photovoltaic performance based electrodes. Graphene oxide (GO) prepared by using modified Hammer’s method. Next, GO two different approaches, which were chemical reduction with vitamin C thermal reduction. latter approach also carried out situ during fabrication heat treatment processes...

Oxidative-exfoliation methods were in vogue the production of rGO from graphite. Processing such synthetic graphite needs high temperatures (≥2500 ​°C). Thus, process is not cost-effective. The present study made on dry leaves sugarcane (Saccharum officinarum) as an alternative raw material so to be economical and environmentally benign. are subjected two-step pyrolysis without any catalyst or reducing agent far divergent produce prepared acid treated rGOs. They evaluated by UV–Vis., FTIR,...

Abstract The preparation of nanostructured carbon materials from chosen biomass through hydrothermal carbonization and pyrolysis processes by optimizing the reaction conditions is one bases for applying product in certain development activities. finished more or less reflects raw material way preparation. Among many products, quantum dots (CQDs) have gained importance due to their bolstered characteristics facile CQDs are zero‐dimensional (0D) nanomaterials which attracted attention recent...

Abstract The utility of carbon quantum dots (CQDs) based electrodes prepared from biomass has drawn the attention scientists and industrialists due to their structural diversities, tuneable physical or chemical properties, economical, environmental, social considerations. As raw material for production CQDs is abundantly available in nature at low‐cost any technological know‐how bound be sustainable. These with porous structure have ideal architecture, physicochemical amenability doping...

The experimental study on the improvement of zinc - air fuel cell performance was carried out for flowing electrolyte with and without gelling agent. discharge capacity measured Chronoamperometry method at constant 0.7 volt. average current provided 27% higher than that non-flowing electrolyte. gelled KOH did not significantly affect lower amount gas evolution. surface morphology powder before after testing characterized by using scanning electron microscope (SEM).

Abstract Carbonaceous materials with large interlayer spacing and disordered structure are considered suitable as electrodes in sodium-ion batteries so to overcome the problem encountered conventional electrodes. In this study, carbon quantum dots (CQDs) decorated SnO2 NaVO3 used fabrication of flexible Na-ion batteries. CQDs prepared from dead leaves Samanea saman tree through alkaline-peroxide treatment hydrothermal carbonization. As-prepared exhibit a yield 21.03% at an excitation...

Abstract Gel-polymer electrolytes with high thermal stability and mechanical properties were considered suitable in rechargeable batteries so as to overcome the problems encountered liquid electrolytes. In a previous study, flexible sodium-ion (FSIBs) fabricated using electrodes made of carbon quantum dots (CQDs) decorated SnO2 NaVO3 utilizing polyvinyl alcohol (PVA)/P3HT gel-polymer electrolyte at ratio 1:0.05. addition, various separators such indium-doped tin oxide/polyoxyethylene...

Sulfonated graphene oxide (sGO) was used as a filler to enhance performance of sulfonated poly(ether ether ketone)(sPEEK) membrane. The sGO firstly prepared by treating oxides (GO) with sulfanilic acid at 70 °C for 20 h. characterized FTIR and XPS techniques. Composite membranes various amount were fabricated via solution casting method. properties composite investigated measuring ion exchange capacity (IEC), water uptake, conductivity vanadium permeability. From the results, it found that...

This work developed a novel ternary composite photoanode of dye-sensitized solar cell (DSSC) composed (i) N-, S-doped titanium dioxide with exposed {001} facet (N-, S-TiO 2{001} ), (ii) reduced graphene oxide S-rGO), and (iii) commercial (P25). The DSSC device fabricated the showed greatest power conversion efficiency (8.62%) compared to P25 (3.20%). enhancement was attributed synergistic effect S-rGO, which act as an electron enricher extractor, respectively.

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Lithium-ion batteries (LiBs) used in electric vehicles (EVs) undergo capacity degradation primarily influenced by charge and discharge currents (C-rates) during acceleration deceleration of the vehicle, as well operating temperature. Therefore, this study aims to comprehensively investigation single cell LiFePO4 resulting from different driving patterns, which exhibit diverse average speeds profiles representing various daily usage scenarios. Additionally, electrical energy required...

The effect of thermal cycling on the agglomeration within 48 hrs Pt and PtRu electrocatalysts was investigated by using transmission electron microscopy (TEM) X-ray diffraction (XRD). In comparison with continuous test, particle under cycle condition more severe. size increment 44.4% 70.4% for tests, respectively. These results are in agreement direct methanol fuel cells (DMFC) performance test. study environment, ethanol solution caused highest agglomeration, followed water.

The electro-oxidation of 40 degree alcohol as a local-commercial spirituous liquor in Thailand compared with pure ethanol solution on the metal catalyst PtSn/C was carried out. With using 5 cm 2 anode electrode catalyst, direct fuel cell employed and then fed 1 M at flow rate ml/min under operating condition atmospheric pressure. results from an output electrical power into (celled 40DFC) indicated that, initial time, provided higher density 6 mW/cm DEFC) same concentration. For open circuit...