Ruthenium oxide coated ordered mesoporous carbon nanofiber arrays: a highly bifunctional oxygen electrocatalyst for rechargeable Zn–air batteries

Guo, Ziyang; Li, Chao; Li, Wangyu; Guo, Hua; Su, Xiuli; He, Ping; Wang, Yonggang; Xia, Yongyao

doi:10.1039/c6ta02030e

Cited by 65 publications

(54 citation statements)

References 48 publications

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“…The average magnetic momentl ocalised on the Fe atoms (m ave )c an oscillate by approximately AE 4.00, so the oscillation amplitude Dm ave is~8 m B .W ed escribe the configurational freedomo faconductingc ovalent oxide by partial charge transfer,flexible orbital occupancies and exchange interactions, the first two of which have been identified previously as of crucial relevance for the OER. [14] The activity of CCF for the OER, reported by Yagi and coworkers as 1.60 eV, [13] is 20 times higher than that of RuO 2 and eight times more than that of BSCF.A lthough RuO 2 is among the best charge conductors, [23] the lack of relevant exchange interactions between localised spin moments and the charge carriers seemst on egatively affect the ability of RuO 2 to perform the OER as effectively as CCF.O ur calculations show no spin polarisation for RuO 2 .I nc omparison, the orbitalp hysics of BSCF are much closer to that of CCF.Acycle of competing spin orderings for the intermediate state oxidation state Co2…”

Section: Resultsmentioning

confidence: 96%

“…The activity of CCF for the OER, reported by Yagi and co‐workers as 1.60 eV, is 20 times higher than that of RuO 2 and eight times more than that of BSCF. Although RuO 2 is among the best charge conductors, the lack of relevant exchange interactions between localised spin moments and the charge carriers seems to negatively affect the ability of RuO 2 to perform the OER as effectively as CCF. Our calculations show no spin polarisation for RuO 2 .…”

Section: Resultsmentioning

confidence: 99%

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Oxygen Evolution Reaction on Perovskite Electrocatalysts with Localized Spins and Orbital Rotation Symmetry

Sharpe¹,

Lim²,

Jiao³

et al. 2016

ChemCatChem

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We have studied, by using ab initio calculations, the electronic properties of electro‐catalysts for the oxygen evolution reaction (OER) with polarised density of states caused by localised spins in the d shell. Oxygen is a molecule in the triplet state (i.e., the outer electrons have parallel spins), which means that the spins localised in the p shell (↑O=O↑), the d shell and the conduction band electrons (t2gnegm) will couple through exchange interactions, which we think will provide favourable conditions for the OER. We compare the perovskites CaCu3Fe4O12 (CCF) and Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) with RuO2. CCF and BSCF both have fluctuating electronic structures accessible at room temperature that are linked to conducting spin‐polarised density of states, equivalent to the paramagnetic state of covalent transition metal oxides with fine charge conductivity. CCF and BSCF both possess a considerable number of unpaired electrons localised in the inner d shell, high‐spin configurations and competing inter‐atomic exchange interactions. As a first approximation, the average fluctuation of the magnetisation in the metal atoms correlates linearly with the OER onset potential for the studied compositions. By linking the dynamics of the localised inner‐electron spins to the conduction spins through exchange interactions, we can predict that other perovskites, such as Sr2Fe0.75Co0.25MoO6, will be OER active at room temperature, as they have similar electronic properties to CCF and BSCF.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Oxygen Evolution Reaction on Perovskite Electrocatalysts with Localized Spins and Orbital Rotation Symmetry

Sharpe¹,

Lim²,

Jiao³

et al. 2016

ChemCatChem

View full text Add to dashboard Cite

show abstract

“…Because the titles of said papers commonly end with ''. for rechargeable Zn-air batteries,'' [29][30][31] it is customary to include charge-discharge cycling to prove that those cathodes are useful in these configurations. The pitfalls of hyping cycle life when using an infinite-capacity (air) electrode lie in the fact that the reported current density and discharge time, which together define the capacity per cycle, often fail to represent the capacity required to balance a realistic zinc anode at technologically relevant specific energy.…”

Section: Rechargeable Zn-air Batteries: Considerations For Testing Nementioning

confidence: 99%

Translating Materials-Level Performance into Device-Relevant Metrics for Zinc-Based Batteries

Parker

Rolison

et al. 2018

Joule

147

118

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Zinc-based batteries are experiencing a resurgence in interest owing to their promising energy and power metrics, and inherent safety advantages compared with lithium-ion batteries. As scientists worldwide address the remaining obstacles to realizing competitive performance across the family of zinc batteries, the enthusiasm to report new ''breakthroughs'' at the materials or small-device level must be tempered by a realistic understanding of how such improvements will translate to practical energy-storage devices. Framing early-stage results in such a context will advance the prospects of next-generation Zn batteries while avoiding the ''hype cycle'' that has plagued research and development for other energy-storage technologies. Herein, we present guidelines by which to evaluate and report data derived from new electrode formulations and cell components such that the results will directly inform which breakthroughs are technologically relevant to scale up.

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“…The commonly used Pt‐based catalysts possess excellent activity for ORR but poor for OER, due to the formation of a stable insulating surface oxide layer during OER . On the other hand, other noble‐metal catalysts, such as iridium oxide (IrO 2 ), are excellent OER catalysts but less active for ORR .…”

Section: Aqueous Secondary Non‐li Metal–o2 Batteriesmentioning

confidence: 99%

“…To this end, some noble metal oxides with bifunctional catalytic activities have been investigated and loaded onto high surface area carbons to maximize their reactivity and lower the overall cost . Guo et al synthesized a RuO 2 ‐coated ordered mesoporous CNFs array from a crab shell hard template to catalyze ORR/OER for Zn–O 2 batteries . This uniform RuO 2 ‐coated CNFs array ensured the best utilization of the catalytic activity of RuO 2 , and at the same time, provided excellent electronic conductivity and mass transport through the carbon frameworks.…”

Section: Aqueous Secondary Non‐li Metal–o2 Batteriesmentioning

confidence: 99%

Toward Promising Cathode Catalysts for Nonlithium Metal–Oxygen Batteries

Mei

Liao

Liang

et al. 2019

Advanced Energy Materials

112

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The success of Li–air/O2 batteries has brought extensive attention to the development of various promising non‐Li metal–O2 batteries, such as Zn–O2, Al–O2, Mg–O2 batteries, etc., which have exhibited unique advantages, such as low production cost, high energy density, and much enhanced safety. The versatile non‐Li metal–O2 batteries provide a better opportunity for meeting the practical requirements for sustainable energy supplies in various applications. A high‐performance cathode in non‐Li metal–O2 batteries that can effectively trigger both oxygen reduction and evolution reactions and thus boost the overall battery performance is of great research interest. In this article, a comprehensive review on the development of Li‐free metal–O2 batteries and particularly focusing on the oxygen catalytic cathodes for both primary and secondary non‐Li metal–O2 batteries is carefully performed. The current challenges and potential solutions are also outlined and proposed. Through carefully selecting and rationally designing promising catalytic cathodes, a series of non‐Li metal–oxygen batteries toward practical energy storage applications are highly anticipated.

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Ruthenium oxide coated ordered mesoporous carbon nanofiber arrays: a highly bifunctional oxygen electrocatalyst for rechargeable Zn–air batteries

Abstract: Zn–air batteries with a RuO2-coated MCNA catalyst display relatively low overpotentials, long cycle life and superior rate capability.

Cited by 65 publications

References 48 publications

Oxygen Evolution Reaction on Perovskite Electrocatalysts with Localized Spins and Orbital Rotation Symmetry

Oxygen Evolution Reaction on Perovskite Electrocatalysts with Localized Spins and Orbital Rotation Symmetry

Translating Materials-Level Performance into Device-Relevant Metrics for Zinc-Based Batteries

Toward Promising Cathode Catalysts for Nonlithium Metal–Oxygen Batteries

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