Application of reduced graphene oxide as the hole transport layer in organic solar cells synthesized from waste dry cells using the electrochemical exfoliation method

Negash, Asfaw; Demeku, Aknachew M.; Molloro, Liboro Hundito

doi:10.1039/d2nj01974d

Cited by 5 publications

(2 citation statements)

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“…Due to the continuing uncontrolled usage of fossil fuels, there is currently an increase in the energy crisis and environmental issues . With their cleanliness and renewability, renewable energy sources like tidal energy, wind, and solar have been hailed as the best replacement for fossil fuels . However, intermittent renewable energy is a significant barrier to effective integration into electric networks.…”

Section: Introductionmentioning

confidence: 99%

“… 1 With their cleanliness and renewability, renewable energy sources like tidal energy, wind, and solar have been hailed as the best replacement for fossil fuels. 2 However, intermittent renewable energy is a significant barrier to effective integration into electric networks. To tackle this issue, the implementation of an energy storage system has been utilized.…”

Section: Introductionmentioning

confidence: 99%

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Surface Electroactive Sites of Tungstated Zirconia Catalysts for Vanadium Redox Flow Batteries

Demeku,

Kabtamu,

Chen

et al. 2024

ACS Appl. Mater. Interfaces

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Surface electroactive sites for tungstate zirconia (WZ) were created by utilizing tungstate-immobilized UiO-66 as precursors via a double-solvent impregnation method under a mild calcination temperature. The WZ-22-650 catalyst, containing a moderate W content (22%), demonstrated a high density of surface electroactive sites. Proper heat treatment facilitated the binding of oligomeric tungsten clusters to stabilized tetragonal ZrO 2 , resulting in improved catalytic performance toward the VO 2+ /VO 2 + redox couples compared to other tested samples. The substantial surface area, mesoporous structure, and establishment of new W−O−Zr bonds affirm the firm anchoring of WO x to ZrO 2 . This robust attachment enhances surface electroactive sites, elevating the electrochemical performance of vanadium redox flow batteries (VRFBs). Charge−discharge tests further demonstrate that the superior voltage efficiency (VE) and energy efficiency (EE) for VRFBs using the WZ-22-650 catalyst are 87.76 and 83.94% at 80 mA cm −2 , which are 13.42% VE and 10.88% EE better than heat-treated graphite felt, respectively. Even at a higher current density of 160 mA cm −2 , VRFBs utilizing the WZ-22-650 catalyst maintained considerable efficiency, recording VE and EE values of 76.76 and 74.86%, respectively. This facile synthesis method resulted in WZ catalysts displaying superior catalytic activity and excellent cyclability, offering a promising avenue for the development of metal-oxide-based catalysts.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Surface Electroactive Sites of Tungstated Zirconia Catalysts for Vanadium Redox Flow Batteries

Demeku,

Kabtamu,

Chen

et al. 2024

ACS Appl. Mater. Interfaces

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Enhanced photocatalytic degradation of methylene blue dye using eco-friendly synthesized rGO@ZnO nanocomposites

Negash,

Mohammed,

Weldekirstos

et al. 2023

Sci Rep

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Industrial chemical pollutants such as methylene blue (MB) dye are released into the water body and potentially cause harm to the human and aquatic biosphere. Therefore, this study aims to synthesize eco-friendly nanocatalysts, i.e., reduced graphene oxide (rGO), zinc oxide (ZnO), and reduced graphene oxide-zinc oxide (rGO@ZnO) nanocomposites, for efficient photocatalytic degradation of MB dye. A graphite rod was obtained from waste dry cell batteries for the electrochemical exfoliation synthesis of graphene oxide (GO) and rGO. For the eco-friendly synthesis of ZnO and rGO@ZnO nanocatalysts, Croton macrostachyus leaf extract was used as a reducing and capping agent. The synthesized nanocatalysts were characterized using a UV–Vis spectrophotometer, Fourier transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy with energy-dispersive X-ray. The eco-friendly synthesized rGO, ZnO, and rGO@ZnO nanocatalysts were applied for the photocatalytic degradation of MB dye using direct sunlight irradiation. At optimum parameters, photocatalytic degradation of MB dye efficiency reached up to 66%, 96.5%, and 99.0%, respectively. Furthermore, kinetics of the photodegradation reaction based on rGO, ZnO, and rGO@ZnO nanocatalysts follow pseudo-first-order with a rate constant of 2.16 × 10–3 min−1, 4.97 × 10−3 min−1, and 5.03 × 10−3 min−1, respectively. Lastly, this study promotes a low catalyst load (20 mg) for the efficient photodegradation of MB dye.

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Novel eutectogels derived from an ionic-liquid-based deep eutectic solvent as electrolytes for supercapacitors: synthesis and characterization

Dutta,

Millar,

Silvester

et al. 2024

New J. Chem.

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Application of reduced graphene oxide as the hole transport layer in organic solar cells synthesized from waste dry cells using the electrochemical exfoliation method

Abstract: The hole transport layer (HTL) plays an important role in improving the efficiency and stability of organic solar cells (OSCs). In this study, waste dry cell batteries were used the...

Cited by 5 publications

References 68 publications

Surface Electroactive Sites of Tungstated Zirconia Catalysts for Vanadium Redox Flow Batteries

Surface Electroactive Sites of Tungstated Zirconia Catalysts for Vanadium Redox Flow Batteries

Enhanced photocatalytic degradation of methylene blue dye using eco-friendly synthesized rGO@ZnO nanocomposites

Novel eutectogels derived from an ionic-liquid-based deep eutectic solvent as electrolytes for supercapacitors: synthesis and characterization

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