Silver decorated alpha-manganese oxide nanostructured electrocatalyst for rechargeable lithium–oxygen battery

Huang, Zheng; Zhang, Ming; Cheng, Junfang; Gong, Yingpeng; Chi, Bo; Pu, Jian; Li, Jian

doi:10.1016/j.catcom.2014.12.009

Cited by 13 publications

(5 citation statements)

References 20 publications

(19 reference statements)

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“…The two peaks of Ag 3d 5/2 and Ag 3d 3/2 for pure Ag sample were observed at 368.0 eV and 374.0 eV, which was consistent with the binding energy of metallic Ag. [66][67][68] In contrast, the Ag 3d spectra for the 50Ag/LSC (368.4 eV for Ag 3d 5/2 and 374.4 eV for Ag 3d 3/2 ) shifted to higher binding energy compared to those of pure metallic Ag, indicating modification of the electronic structure of Ag with the oxidized valence state caused by the oxide LSC. 34,54 On the other hand, we also investigated the oxidation states of Co ions for both LSC and 50Ag/LSC shown in Figure 3b.…”

Section: Resultsmentioning

confidence: 93%

Silver-Perovskite Hybrid Electrocatalysts for Oxygen Reduction Reaction in Alkaline Media

Wang

Zhu

et al. 2018

J. Electrochem. Soc.

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Developing a low-cost, and highly-efficient catalysts for improving oxygen reduction reaction (ORR) is imperative to the energy storage and conversion device. Here, we synthesized Ag/La 0.6 Sr 0.4 CoO 3-δ (Ag/LSC) composites by decorating LSC with Ag using the electroless technique. As a result, the LSC was homogenously overlaid with Ag nanoparticles. The derived Ag/LSC composites possessed a relatively higher specific surface area than pure LSC and Ag. The Co-O-Ag bonds in the composites contribute substantial electrons transferred from Ag to Co element, resulting in the unique electronic structures and strong electronic interaction between Ag and LSC. The significant improvements of ORR activity in alkaline solution at room temperature can be observed in Ag/LSC composites compared to the pure Ag and LSC. The composites with optimal Ag loading (50 wt%) showed best ORR activity among all the composites according to the half-wave potential and diffusion limiting current density. The presented strategy of silver surface modification via electroless process can provide effective routes for designing high performance metal oxide (e.g. perovskite) composite electrocatalysts.

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Section: Resultsmentioning

confidence: 93%

Silver-Perovskite Hybrid Electrocatalysts for Oxygen Reduction Reaction in Alkaline Media

Wang

Zhu

et al. 2018

J. Electrochem. Soc.

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“…δ-MnO 2 exhibits a layered crystalline structure, and some small cations (e.g., K + , H + ) and molecules (e.g., H 2 O) are located in the interlayer spaces [24], establishing the foundation for catalyzing the formation of LiOH. Meanwhile, embedding noble metal particles or clusters in the transition metal oxides is efficient to boost the catalytic effect synergistically [27,28]. Moreover, designing a free-stand-ing three-dimensional (3D) porous structure plays a key role in improving the catalytic ability and avoiding side reactions caused by the carbon substrate or polymer binder [29,30].…”

Section: Introductionmentioning

confidence: 99%

Reversible LiOH chemistry in Li-O2 batteries with free-standing Ag/δ-MnO2 nanoflower cathode

et al. 2022

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The low energy efficiency and poor cycle stability arising from the high aggressivity of discharge products toward organic electrolytes limit the practical applications of Li-O 2 batteries (LOBs). Compared with the typical discharge product Li 2 O 2 , LiOH shows better chemical and electrochemical stability. In this study, a free-standing cathode composed of hydrangea-like δ-MnO 2 with Ag nanoparticles (NPs) embedded in carbon paper (CP) (Ag/δ-MnO 2 @CP) is fabricated and used as the catalyst for the reversible formation and decomposition of LiOH. The possible discharge mechanism is investigated by in situ Raman measurement and density functional theory calculation. Results confirm that δ-MnO 2 dominantly catalyzes the conversion reaction of discharge intermediate LiO 2* to LiOH and that Ag particles promote its catalytic ability. In the presence of Ag/δ-MnO 2 @ CP cathode, the LOB exhibits enhanced specific capacity and a high discharge voltage plateau under humid O 2 atmosphere. At a current density of 200 mA g −1 , the LOB with the Ag/δ-MnO 2 @CP cathode presents an overpotential of 0.5 V and an ultra-long cycle life of 867 cycles with a limited specific capacity of 500 mA h g −1 . This work provides a fresh view on the role of solid catalysts in LOBs and promotes the development of LOBs based on LiOH discharge product for practical applications.

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“…Although single‐component α‐MnO 2 or binary composites of α‐MnO 2 and carbon materials could show excellent activity over the course of discharge/charge, as mentioned above, a high OER overpotential remained. In order to further lower the charge potential, many efforts have been made to design more efficient α‐MnO 2 ‐based bifunctional catalysts/cathodes, such as noble metals and their oxides modified α‐MnO 2 , and other transition metal oxides modified α‐MnO 2 . On noble metals modification aspect, Pd decorated mesoporous α‐MnO 2 nanotubes (Pd@α‐MnO 2 ) enhanced the discharge specific capacity, meanwhile, the charging potential was controlled at 3.6 V .…”

Section: The Types Of Manganese‐based Oxides For Li–o2 Battery Cathodmentioning

confidence: 99%

“…A moderate amount of Pt nanoparticles surface‐decorated α‐MnO 2 nanotubes enhanced the decomposition kinetics of Li 2 O 2 during the charging process, and the kinetic of decomposition reaction followed zero‐order model . Similarly, α‐MnO 2 nanorods modified with Ag particles enhanced the capacity and cycle life, but due to the excessive activity, the addition of Ag caused the decomposition of carbonate based electrolyte and formed byproduct of LiCO 3 . Jang et al reported a 3D nanostructured α‐MnO 2 /RuO 2 catalyst, and the mixed oxides with the excellent ORR activity coming from α‐MnO 2 and outstanding OER performance coming from RuO 2 apparently optimized the performance of Li–O 2 battery.…”

Section: The Types Of Manganese‐based Oxides For Li–o2 Battery Cathodmentioning

confidence: 99%

Advances in Manganese‐Based Oxides Cathodic Electrocatalysts for Li–Air Batteries

Bao

Sun

Liu

et al. 2018

Adv Funct Materials

132

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Li-air batteries, characteristic of superhigh theoretical specific energy density, cost-efficiency, and environment-friendly merits, have aroused ever-increasing attention. Nevertheless, relatively low Coulomb efficiency, severe potential hysteresis, and poor rate capability, which mainly result from sluggish oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) kinetics, as well as pitiful cycle stability caused by parasitic reactions, extremely limit their practical applications. Manganese (Mn)-based oxides and their composites can exhibit high ORR and OER activities, reduce charge/discharge overpotential, and improve the cycling stability when used as cathodic catalyst materials. Herein, energy storage mechanisms for Li-air batteries are summarized, followed by a systematic overview of the progress of manganesebased oxides (MnO 2 with different crystal structures, MnO, MnOOH, Mn 2 O 3 , Mn 3 O 4 , MnOx, perovskite-type and spinel-type manganese oxides, etc.) cathodic materials for Li-air batteries in the recent years. The focus lies on the effects of crystal structure, design strategy, chemical composition, and microscopic physical parameters on ORR and OER activities of variousMn-based oxides, and even the overall performance of Li-air batteries. Finally, a prospect of the research for Mn-based oxides cathodic catalysts in the future is made, and some new insights for more reasonable design of Mn-based oxides electrocatalysts with higher catalytic efficiency are provided.

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Silver decorated alpha-manganese oxide nanostructured electrocatalyst for rechargeable lithium–oxygen battery

Cited by 13 publications

References 20 publications

Silver-Perovskite Hybrid Electrocatalysts for Oxygen Reduction Reaction in Alkaline Media

Silver-Perovskite Hybrid Electrocatalysts for Oxygen Reduction Reaction in Alkaline Media

Reversible LiOH chemistry in Li-O2 batteries with free-standing Ag/δ-MnO2 nanoflower cathode

Advances in Manganese‐Based Oxides Cathodic Electrocatalysts for Li–Air Batteries

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