No abstract

Graphene, a novel 2D nanomaterial, has been intensively studied and utilized in many fields of applications. Graphenebased conductive ink has attracted many scientific researchers due to its flexibility, durability, and, most importantly, high electrical conductivity. However, the low dispensability and high curing temperature have hindered the use of graphene ink in many practical applications. In this work, graphene nanoplatelets (GNPs) were modified with oleic acid to improve dispensability. Then, the modified GNPs were employed as a major component in the conductive ink's formulation. The effects of the oleic acid, binder, and GNPs contents on the conductivity of the prepared ink were studied. The results showed that at the ink's formulation of 0.75 % binder and 6 % GNPs (modified with 2.5 % oleic acid), the lowest resistance with the value of 22 Ω.cm and sheet resistance of 7.56 Ω cm 2 was obtained. Remarkably, the high conductivity of the modified conductive ink on the substrate could also be observed after curing at room temperature, which is advantageous for practical application. The viscosity of the resultant conductive ink could also be adjusted by changing the amount of solvent in the ink's formulation for application of the ink in the pen, painting, or inkjet printing.

Photocatalysts are an attractive solution for pollutant degradation under sunlight irradiation. One approach that has been proposed to enhance their activity is to combine two semiconductors, which can broaden the photon energy harvesting regions and improve charge separation. Herein, a facile approach to fabricating a g-C3N4@porphyrin nanorods hybrid material is presented using CTAB surfactant-assisted self-assembly of monomeric porphyrin molecules and g-C3N4 nanomaterials. The hybrid material was characterized using various technical methods, revealing a uniform distribution of porphyrin nanorods on the surface of g-C3N4. The photocatalytic performance of the hybrid material was evaluated by investigating its behavior for the photo -oxidation and -degradation of Cr6+ ions and methylene blue organic dye under simulated sunlight irradiation. High photocatalytic performance towards these two pollutants was exhibited by the hybrid material with a removal percentage of nearly 100% after 100 min of reaction time under the simulated sunlight spectrum. Furthermore, a potential photocatalytic mechanism of the C3N4@porphyrin nanorods photocatalyst was proposed, which involved the efficient separation and transfer of photo-induced electrons and holes on the surface of the hybrid material. An effective and facile method for developing high-performance photocatalysts is offered by this work, and advances in our understanding of their photocatalytic mechanisms have been made. The findings have important implications for wastewater treatment and solar energy conversion. The use of this hybrid material may contribute to addressing environmental challenges and assist in building sustainable energy systems.

For the purpose of expanding the working potential window and reducing the self-discharge for the Zn-ion hybrid supercapacitor, a positive electrode (cathode) of Mn-Co-sulfide-Polyaniline (MCS-PANi) composite coated on porous graphite...