Recent progress in MnO2-based oxygen electrocatalysts for rechargeable zinc-air batteries

Worku, Ababay Ketema; Ayele, Delele Worku; Habtu, Nigus Gabbiye; Teshager, Minbale Admas; Workineh, Zerihun G.

doi:10.1016/j.mtsust.2021.100072

Cited by 46 publications

(23 citation statements)

References 145 publications

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“…The oxide coating thickness increases with increasing sonication time, which can cause conductivity and charge transfer issues due to the insulating nature of the oxide. [33] Increasing the sonication time also creates patches of thicker oxide on the surface of the fibers (Figure 3a, e, i, m, q and u). This may not be a major issue in terms of conductivity and electron/species transfer due to the small amount of MnÀ Co oxide catalyst relative to the carbon fibers.…”

Section: Mnà Co Mixed Oxide Coated Carbon Fiber Characterization and Catalytic Activitymentioning

confidence: 98%

“…The presence of both tetrahedral and octahedral sites (filled with Mn and Co cations, respectively) in the MnÀ Co spinel structure provides donor-acceptor chemisorption sites (active sites) for O 2 , which can provide efficient catalytic activity towards ORR/OER. [33] The MnCo-5h-1 : 1 and MnCo-5h-2 : 1 samples were also characterized, using electron diffraction in the TEM and XPS (Figure SI1 and SI2). Both samples have SAED patterns similar to MnCo-5h-1 : 2 and the patterns can be indexed to a cubic spinel structure (Figure SI1a and b).…”

Section: Mnà Co Mixed Oxide Coated Carbon Fiber Characterization and Catalytic Activitymentioning

confidence: 99%

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Spinel Type Mn−Co Oxide Coated Carbon Fibers as Efficient Bifunctional Electrocatalysts for Zinc‐Air Batteries

Ivey

Abedi

Leistenschneider

et al. 2021

Batteries & Supercaps

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MnÀ Co mixed oxide nanoparticles were coated onto carbon fibers (CFs) derived from asphaltene through a facile coating process. Homemade gas diffusion layers (GDLs) were prepared with the coated CFs to be employed as air electrodes and bifunctional oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) electrocatalysts for Zn-air batteries (ZAB). The MnÀ Co oxide was identified as a cubic spinel phase (MnCo 2 O 4 ) by transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The composite air electrode showed excellent catalytic activity towards ORR/OER, outperforming the benchmark Pt-RuO 2 catalyst in both half-cell and full-cell configurations with discharge/charge efficiencies of 63.7 % and 60.0 % at 10 and 20 mA cm À 2 , respectively. After 200 cycles (100 h) at 10 mA cm À 2 the final efficiency of the composite electrode (58.9 %) was still superior to that of PtÀ Ru (43.2 %).

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Section: Mnà Co Mixed Oxide Coated Carbon Fiber Characterization and Catalytic Activitymentioning

confidence: 98%

Section: Mnà Co Mixed Oxide Coated Carbon Fiber Characterization and Catalytic Activitymentioning

confidence: 99%

Spinel Type Mn−Co Oxide Coated Carbon Fibers as Efficient Bifunctional Electrocatalysts for Zinc‐Air Batteries

Ivey

Abedi

Leistenschneider

et al. 2021

Batteries & Supercaps

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show abstract

“…which mentioned moisture evaporation from the fiber structure. Whereas the rest stages are linked to the degradation of polysaccharides such as cellulose, hemicelluloses, and lignin [38,39]. Hemicelluloses start to degrade earlier and decompose in the range 220-350 °C.…”

Section: Introductionmentioning

confidence: 99%

Characterization and optimization of alkali-treated yushania alpina bamboo fiber properties: case study of ethiopia species

et al. 2022

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The mechanical properties of single Yushania alpina bamboo fibers have not been explored. This is a serious limitation on their application. The main purpose of this work is to fill up information gaps to prepare for the growing usage of Ethiopian bamboo in a variety of applications. This study looks at the characterization and optimization of Y.alpina bamboo fiber properties extracted both chemically and mechanically. Using response surface methodology (RSM) the mechanical properties were optimized and linear, quadratic and interaction of independent variables were determined. Samples of length 25–30 cm were harvested at various ages from the middle of the stem which was then soaked in different NaOH concentrations weight by volume for different times. Using a rolling machine that has three rollers, the fiber is mechanically extracted. The optimal mechanical properties were observed at plant age of 1.8 years, alkali concentration of 10%, and a soaking duration of 2.0 days. The model is significant (P ≤ 0.005) with a 95% confidence level for predicted values that were closer to the measured values, indicating that the model's fit to the measured properties was strong at the optimized values. The optimized points of age and soaking duration ware subjected to chemical, thermal and morphological analysis for each corresponding NaOH Concentration (6, 12, and 18%) levels. Scanning electron microscopy (SEM) was employed to examine the microstructure of the fibers and discovered that the 18% NaOH treated fiber resulted in more wrinkles in the surface of bamboo fibers when compared with the 6 and 12%NaOH Bamboo fiber. Using thermogravimetric analysis (TGA) and differential thermal gravimetric (DTG), the study investigated weight loss increased as alkali concentration increased but the scenario functioned for proper concentration.

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“…So, it is desired to look for an alternate energy storage device [14]. Metal-air batteries are studied as the alternate of lithiumion batteries and a lot of research has been conducted on metal-air batteries [15][16][17][18][19][20][21][22][23][24][25]. Among all types of metal-air batteries, LAB is the suitable candidate to replace the fossil fuel-based transportation in future due to its high theoretical energy density of 11,140 Wh/kg among the other types of batteries and is also comparable to the energy density of the gasoline which is 12,700 Wh/kg [26].…”

Section: Introductionmentioning

confidence: 99%

Aprotic lithium air batteries with oxygen-selective membranes

Uzair

Zahoor

Shaikh

et al. 2022

Mater Renew Sustain Energy

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Rechargeable batteries have gained a lot of interests due to rising trend of electric vehicles to control greenhouse gases emissions. Among all type of rechargeable batteries, lithium air battery (LAB) provides an optimal solution, owing to its high specific energy of 11,140 Wh/kg comparable to that of gasoline 12,700 Wh/kg. However, LABs are not widely commercialized yet due to the reactivity of the lithium anode with the components of ambient air such as moisture and carbon dioxide. To address this challenge, it is important to understand the effects of moisture on the electrochemical performance of LAB. In this review, the effects of ambient air on the electrochemical performance of LAB have been discussed. The literature on the deterioration in the battery capacity and cyclability due to operation in ambient environment and degradation of lithium anode due to exothermic reaction between lithium and water is reviewed and explained. The effects of using oxygen-selective membrane (OSM) to block moisture and $${\mathrm{CO}}_{2}$$ CO 2 contamination has also been discussed, along with suitable materials that can act as OSM. It is concluded that the utilization of OSM can not only make the safer operation of LAB in ambient air but could also enhance the electrochemical performance of LAB. Future direction of the research work required to address the associated challenges is also provided.

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Recent progress in MnO2-based oxygen electrocatalysts for rechargeable zinc-air batteries

Cited by 46 publications

References 145 publications

Spinel Type Mn−Co Oxide Coated Carbon Fibers as Efficient Bifunctional Electrocatalysts for Zinc‐Air Batteries

Spinel Type Mn−Co Oxide Coated Carbon Fibers as Efficient Bifunctional Electrocatalysts for Zinc‐Air Batteries

Characterization and optimization of alkali-treated yushania alpina bamboo fiber properties: case study of ethiopia species

Aprotic lithium air batteries with oxygen-selective membranes

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