Browsing by Author "Ampong, D.N."
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Item Nanomaterials in 2-dimensions for flexible solar cell applications – a review(Cogent Engineering, 2022) Agyei-Tuffour, B.; Mensah-Darkwa, K.; Ampong, D.N.; Addae, E.A.; Gbadam, G.S.; Darko, C.N.S.; Akyaw, A.O.; Adjah, J.; Asare, J.; Li, G.; Goosen, N.J.This review presents the progress, challenges and prospects of ultrathin flexible photovoltaic devices based on 2-dimensional (2D) nanomaterials. These devices have shown very high performance in bending stabilities for up to ~90% of their power conversion efficiencies (PCEs) after multiple bending deformations. They are thin film PVs with lightweight and mechanically robust structures that allow use in the continual advancing solar cell applications. In this paper, comprehensive assessments of 2D nanomaterials, their syntheses methods, performance, degradation, mechanical and opto-electronic characterization in flexible photovoltaic (PV) cells are highlighted. Semi-conductor materials such as conjugated donor and acceptor polymers, small donor/acceptor molecules and organometal halide perovskites for use as active layers in such flexible solar cell structures are reviewed. The challenges and prospects associated with the adoption of 2D nanomaterials in flexible solar cells are presented. The review highlights the need to transition laboratory results on 2D nanomaterials based flexible solar cells into scale up and commercialized products despite the existing and also opens research areas for researchers to explore and achieve robust and high-efficient solar devicesItem Nanowires for Electrochemical Energy Storage Applications(Taylor and Francis Group an Informa Business, 2023) Darkwa, K.M.; Ampong, D.N.; Boamah, R.; et al.Electrochemical reactions involve the exchange of electrons and ions at the interfaces between electrodes and an electrolyte allowing supercapacitors to store energy by separating positive and negative charges. Over the past few years, nanowires, as one of the representative one dimensional (1D) nanomaterials, have demonstrated excellent capability for realizing a variety of applications in the fields of energy storage. Moreover, they offer 1D electronic pathways, which are key in charge transport, a large active interface between the electrolyte and electrode, etc. The high aspect ratio property of nanowires provides high surface area thereby enhancing electrolyte interaction with active electrode sites, resulting in increased material utilization, continuous electron transport, reduced resistance to charge flow, and improving electrode conductivity and kinetics. This chapter presents the theory, synthesis, and application of nanowires for electrochemical energy storage (EES) devices. It also highlights the scientific challenges associated with nanowires’ integration into energy storage devices, including reduced coulombic efficiency, capacity decay, and poor cycling, with possible solutions. Finally, a projection into the future direction of nanowire’s appli cation in energy storage devices is presented and discussedElectrochemical reactions involve the exchange of electrons and ions at the interfaces between electrodes and an electrolyte allowing supercapacitors to store energy by separating positive and negative charges. Over the past few years, nanowires, as one of the representative one dimensional (1D) nanomaterials, have demonstrated excellent capability for realizing a variety of applications in the fields of energy storage. Moreover, they offer 1D electronic pathways, which are key in charge transport, a large active interface between the electrolyte and electrode, etc. The high aspect ratio property of nanowires provides high surface area thereby enhancing electrolyte interaction with active electrode sites, resulting in increased material utilization, continuous electron transport, reduced resistance to charge flow, and improving electrode conductivity and kinetics. This chapter presents the theory, synthesis, and application of nanowires for electrochemical energy storage (EES) devices. It also highlights the scientific challenges associated with nanowires’ integration into energy storage devices, including reduced coulombic efficiency, capacity decay, and poor cycling, with possible solutions. Finally, a projection into the future direction of nanowire’s application in energy storage devices is presented and discussed