Engineering nanostructured Ag doped α-MnO2 electrocatalyst for highly efficient rechargeable zinc-air batteries

Worku, Ababay Ketema; Ayele, Delele Worku; Habtu, Nigus Gabbiye; Ambaw, Mehary Dagnew

doi:10.1016/j.heliyon.2022.e10960

Cited by 13 publications

(7 citation statements)

References 64 publications

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“…The use of harmless, widely accessible materials for reduced manufacturing costs and improved operating safety has been the main focus of this topic’s research. With its capacity to offer high specific energy in a variety of electrical appliances, including medical equipment and communication implements, Li-ion battery technology stands out ( Worku et al, 2022a ; Worku et al, 2022b ; Hossain and Sahajwalla, 2022 ; Ambissa Begaw et al, 2023 ). Yet, supercapacitors (SCs) with high specific power that can deliver significant amounts of electrical energy in a little length of time are needed for the creation of next-generation hybrid systems ( Chen et al, 2017 ; Wang et al, 2023 ).…”

Section: Introductionmentioning

confidence: 99%

Engineering of Co3O4 electrode via Ni and Cu-doping for supercapacitor application

Worku,

Asfaw,

Ayele

2024

Front. Chem.

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Although cobalt oxides show great promise as supercapacitor electrode materials, their slow kinetics and low conductivity make them unsuitable for widespread application. We developed Ni and Cu-doped Co3O4 nanoparticles (NPs) via a simple chemical co-precipitation method without the aid of a surfactant. The samples were analyzed for their composition, function group, band gap, structure/morphology, thermal property, surface area and electrochemical property using X-ray diffraction (XRD), ICP-OES, Fourier transform infrared (FTIR) spectroscopy, Ultraviolet-visible (UV-Vis), Scanning electron microscopy (SEM), Thermogravimetric analysis (TGA) and/or Differential thermal analysis (DTA), Brunauer–Emmett–Teller (BET), and Impedance Spectroscopy (EIS), Cyclic voltammetry (CV), respectively. Notably, for the prepared sample, the addition of Cu to Co3O4 NPs results in a 11.5-fold increase in specific surface area (573.78 m2 g−1) and a decrease in charge transfer resistance. As a result, the Ni doped Co3O4 electrode exhibits a high specific capacitance of 749 F g−1, 1.75 times greater than the pristine Co3O4 electrode’s 426 F g−1. The electrode’s enhanced surface area and electronic conductivity are credited with the significant improvement in electrochemical performance. The produced Ni doped Co3O4 electrode has the potential to be employed in supercapacitor systems, as the obtained findings amply demonstrated.

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Section: Introductionmentioning

confidence: 99%

Engineering of Co3O4 electrode via Ni and Cu-doping for supercapacitor application

Worku,

Asfaw,

Ayele

2024

Front. Chem.

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“…Many high-performance supercapacitors have been developed using transition metal compounds with nanostructures [10], such as aluminum oxide [11], niobium oxide [12], iron oxide [13], etc. As a typical representative of pseudocapacitive materials, MnO 2 has attracted great attention as a good candidate for electrode materials owing to its rich sources, low price, and excellent electrochemical performance (theoretical specific capacitance of 1370 F/g) [14,15]. MnO 2 can obtain various forms under different process conditions, and its most common crystal forms are α-MnO 2 , β-MnO 2 , γ-MnO 2 , δ-MnO 2 , and λ-MnO 2 [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Ag-Doped Urchin-like MnO2 on Carbon Cloth for Supercapacitors

Feng,

Qu,

Wang

et al. 2024

Materials

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Based on MnO2/carbon cloth (CC) composite materials, an Ag-doped MnO2 nanowire, self-assembled, urchin-like structure was synthesized in situ on the surface of CC using a simple method, and a novel and efficient flexible electrode material for supercapacitors was developed. The morphology, structure, elemental distribution, and pore distribution of the material were analyzed using SEM, TEM, XRD, XPS, and BET. The electrochemical performance was tested using cyclic voltammetry (CV) and galvanostatic charge/discharge (GCD). In the three-electrode system, GCD testing showed that the specific capacitance of the material reached 520.8 F/g at 0.5 A/g. After 2000 cycles at a current density of 1 A/g, the capacitance retention rate was 90.6%, demonstrating its enormous potential in the application of supercapacitor electrode materials.

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“…One of the causes is that Co 3 O 4 poor capacitance and cycle efficiency result from the material's significant volume expansion and contraction, low conductivity, and high particle aggregation [ 50 , 72 , 73 ]. Hence,Co 3 O 4 nanoparticles (NPs) can be prepared via several approaches such as the hydrothermal [ 56 ], sol-gel method [ 61 ], thermal decomposition [ 25 ], co-precipitation [ 33 , 78 ], spray pyrolysis [ 11 ] and solvothermal methods [ 10 ].However, these methods are expensive, require complex equipment and take a long time to prepare [ 53 , 58 ]. Among these, co-precipitation approach, has the benefit of being quick, affordable, and simple to control throughout preparations [ 12 , 83 ].…”

Section: Introductionmentioning

confidence: 99%

Enhancing pseudocapacitive properties of cobalt oxide hierarchical nanostructures via iron doping

Alem

Worku

Ayele

et al. 2023

Heliyon

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Engineering nanostructured Ag doped α-MnO2 electrocatalyst for highly efficient rechargeable zinc-air batteries

Cited by 13 publications

References 64 publications

Engineering of Co3O4 electrode via Ni and Cu-doping for supercapacitor application

Engineering of Co3O4 electrode via Ni and Cu-doping for supercapacitor application

Facile Synthesis of Ag-Doped Urchin-like MnO2 on Carbon Cloth for Supercapacitors

Enhancing pseudocapacitive properties of cobalt oxide hierarchical nanostructures via iron doping

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