Ultrasonochemically-induced MnCo<sub>2</sub>O<sub>4</sub> nanospheres synergized with graphene sheet as a non-precious bi-functional cathode catalyst for rechargeable zinc–air battery

Chandrappa, Shivaraju Guddehalli; Prabu, M.; Karkera, Guruprakash; Prakash, A. S.

doi:10.1039/c9na00129h

Cited by 17 publications

(14 citation statements)

References 28 publications

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“…By analyzing the Mn 2p spectrum (Figure b), two prominent peaks at 641.9 and 653.8 eV are correspondingly ascribed to the Mn 2p 3/2 and Mn 2p 1/2 doublets, which can be further divided into four subpeaks via the Gaussian fitting method. The two peaks located at 641.6 and 652.3 eV are related to the Mn 2+ state, whereas the peaks at 644.1 and 655.2 eV are related to the Mn 3+ state Figure c shows the spectrum of Co 2p, and the original curve is deconvoluted into two main peaks corresponding to Co 2p 1/2 (795.1 eV) and Co 2p 3/2 (779.9 eV). , Moreover, two shake-up satellite (“sat”) peaks at the Co 2p 1/2 and 2p 3/2 levels also appear at approximately 804.0 and 788.5 eV, suggesting the coexistence of the Co 2+ and Co 3+ oxidation states in the product .…”

Section: Resultsmentioning

confidence: 99%

Electrospun MnCo₂O₄ Nanotubes as High-Performance Anode Materials for Lithium-Ion Batteries

Zhu

Yao

et al. 2020

Energy Fuels

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Transition metal oxides with spinel AB2O4 phases are deemed as potential anode materials for lithium-ion batteries (LIBs), attributing to high specific capacities, low cost, and environmental friendliness, but the pulverization problem induced by the volume changes upon lithiation/delithiation greatly restricts their practical applications. To overcome this problem by nanostructure engineering, we herein successfully design and fabricate one-dimensional (1D) nanotubes consisted of interconnected MnCo2O4 nanoparticles via the convenient electrospinning process and the following heating method. As an anode for LIBs, the as-prepared 1D MnCo2O4 nanotubes demonstrate superior lithium storage properties, showing a high specific capacity (701.4 mA h g–1 at 500 mA g–1 even after going through 320 cycles) and a high-rate performance (400.4 mA h g–1 at 1 A g–1). The unique 1D hollow tubular nanoarchitecture assembled from interconnected nanoparticles can provide richer active sites and shorten the lithium diffusion length, as well as mitigate the pulverization issue caused by volume changes.

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Section: Resultsmentioning

confidence: 99%

Electrospun MnCo₂O₄ Nanotubes as High-Performance Anode Materials for Lithium-Ion Batteries

Zhu

Yao

et al. 2020

Energy Fuels

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“…3−5 Under the lens, metal−air batteries seem to be interesting, as they have larger energy densities via a different mechanism for charge storage. 6,7 Among all the M−O 2 combinations Li−oxygen batteries are attractive as abundantly available O 2 produces energy similar to that of gasoline, when combined with lithium. 8 However, the serious challenges encountered by Li−O 2 batteries hold back their phase of commercialization.…”

Section: Introductionmentioning

confidence: 99%

“…The energy storage space is now acquired by Li-ion batteries, which are proven to be the leading players among next-generation batteries . However, Li-ion batteries are limited by their intercalation chemistry, which depends on the reversible shuttle of Li + ions between the electrodes. − Under the lens, metal–air batteries seem to be interesting, as they have larger energy densities via a different mechanism for charge storage. , Among all the M–O 2 combinations Li–oxygen batteries are attractive as abundantly available O 2 produces energy similar to that of gasoline, when combined with lithium . However, the serious challenges encountered by Li–O 2 batteries hold back their phase of commercialization.…”

Section: Introductionmentioning

confidence: 99%

Decoupling the Cumulative Contributions of Capacity Fade in Ethereal-Based Li–O₂ Batteries

Karkera

Prakash

2019

ACS Appl. Mater. Interfaces

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In the loop of numerous challenges and ambiguities, Li–O2 batteries are crawling to reach their commercialization phase. To achieve the progressive milestones, along with the developments in the architecture of cathodes, anodes, and electrolytes, understanding its failure mode is equally important. Under an unrestricted charge–discharge protocol, cyclability of nonaqueous Li–O2 batteries are limited to only a few cycles. This report examines an additive-free ether-based Li–O2 battery in the perspective of identifying the origin of possible side reactions and their affiliations to integral components of the battery. Structural and compositional changes during every charge–discharge sequence are studied using bottom-up sequential tear-down analysis. The substantial increase in impedance and corresponding decrease in capacities after every cycle are interrelated to the amount of electrode passivation resulting from the discharge products and electrolyte decomposition. From the tear-down analysis, it is approximated that, among the total capacity loss, ≈55% is attributed to the cathode, ≈28% of the loss corresponds to the anode, and ≈17% is attributed to the electrolyte, given that battery failure instigates from the “reactive oxygen species”. Electrochemically formed Li2O2 via the superoxide pathway induces large decomposition overpotentials up to 4.6 V versus Li/Li+ because of its overrated reactivity with electrolytes and carbon supports. On the contrary, efficient decomposition of chemically formed Li2O2 below 3.9 V proves that the extra charge potential observed for electrochemically formed Li2O2 is in fact consumed for the decomposition of irreversibly formed side products via the superoxide pathway. Spontaneous reactivity of Li2O2 and trivial reactivity of Li2O highlight the need of advanced strategies to maneuver oxygen red-ox in selective pathways that unalter the electrolyte and electrodes, and the necessity of their synchronized performance for the evolution of practical Li–O2 batteries.

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“…These results confirm the structure, stability, and composition of the catalyst prepared. The results presented in this work are comparable to other transition metal based catalysts reported in literature …”

Section: Resultsmentioning

confidence: 99%

Ion Immobilized Bifunctional Electrocatalyst for Oxygen Reduction and Evolution Reaction

Imran

Ramya

Ghosh

et al. 2019

ACS Appl. Energy Mater.

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Development of nonprecious metal based bifunctional catalyst with superior oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) activity in alkaline solution is of great importance for aqueous metal−air batteries. Herein, we discuss the ion immobilized transition metal oxide nanoparticles embedded into the sulfur-doped carbon framework M−S−C (M = Mn, Co, and Mn−Co) via carbonization strategy, with high catalytic activity and stability. Due to ion exchange, the position of the metal ion is limited to the ion exchange site limiting the particle size. The synergistic effect between S-doped carbon and transition-metal nanoparticles in the catalyst led to high bifuctionality for all three catalysts (Mn−S−C, Co−S−C, and Mn−Co−S−C). The overall oxygen electrode activities (ΔE = E j=10 − E 1/2) for Mn−S−C, Co−S−C, Mn−Co−S−C, S−C, and Pt/C are 0.85, 0.81, 0.83, 1.1, and 1.03 V, respectively, for bifunctionality and are smaller than most of the precious and nonprecious metal catalysts reported in literature. OER (10 mA cm−2) and ORR (from onset potential) overpotentials for Mn−S−C, Co−S−C, Mn−Co−S−C, and S−C are (460 mV, 290 mV), (360 mV, 350 mV), (410 mV, 330 mV), and (510 mV, 420 mV), respectively. Among the synthesized catalysts, Mn−S−C exhibited higher ORR activity (Mn−S−C > Mn−Co−S−C > Co−S−C) and Co−S−C exhibited better OER activity (Co−S−C > Mn−Co−S−C > Mn−S−C). Hence, optimized actvity for both ORR and OER is achieved by Co−S−C catalyst. This potential bifunctional catalyst, when employed as an electrode material for rechargeable zinc−air battery, exhibited effective bifunctionality for catalyzing both ORR and OER with significantly higher energy efficiency, reduced voltage polarization, and improved cyclic stability up to 100 cycles at discharge current density of 10 mA cm−2. The improved catalytic activity arises from favorable factors such as particle size, homogeneous dispersion of metal nanoparticles on carbon framework, and synergistic effect of sulfur and metal oxides.

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Ultrasonochemically-induced MnCo₂O₄ nanospheres synergized with graphene sheet as a non-precious bi-functional cathode catalyst for rechargeable zinc–air battery

Abstract: MnCo2O4–GS nano composite by a one-pot sonochemical method and its high performance as an active cathode catalyst for a Zn–air battery.

Cited by 17 publications

References 28 publications

Electrospun MnCo₂O₄ Nanotubes as High-Performance Anode Materials for Lithium-Ion Batteries

Electrospun MnCo₂O₄ Nanotubes as High-Performance Anode Materials for Lithium-Ion Batteries

Decoupling the Cumulative Contributions of Capacity Fade in Ethereal-Based Li–O₂ Batteries

Ion Immobilized Bifunctional Electrocatalyst for Oxygen Reduction and Evolution Reaction

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Ultrasonochemically-induced MnCo2O4 nanospheres synergized with graphene sheet as a non-precious bi-functional cathode catalyst for rechargeable zinc–air battery

Abstract: MnCo2O4–GS nano composite by a one-pot sonochemical method and its high performance as an active cathode catalyst for a Zn–air battery.

Cited by 17 publications

References 28 publications

Electrospun MnCo2O4 Nanotubes as High-Performance Anode Materials for Lithium-Ion Batteries

Electrospun MnCo2O4 Nanotubes as High-Performance Anode Materials for Lithium-Ion Batteries

Decoupling the Cumulative Contributions of Capacity Fade in Ethereal-Based Li–O2 Batteries

Ion Immobilized Bifunctional Electrocatalyst for Oxygen Reduction and Evolution Reaction

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Product

Resources

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Ultrasonochemically-induced MnCo₂O₄ nanospheres synergized with graphene sheet as a non-precious bi-functional cathode catalyst for rechargeable zinc–air battery

Electrospun MnCo₂O₄ Nanotubes as High-Performance Anode Materials for Lithium-Ion Batteries

Electrospun MnCo₂O₄ Nanotubes as High-Performance Anode Materials for Lithium-Ion Batteries

Decoupling the Cumulative Contributions of Capacity Fade in Ethereal-Based Li–O₂ Batteries