Hierarchical Mesoporous/Macroporous Perovskite La0.5Sr0.5CoO3–xNanotubes: A Bifunctional Catalyst with Enhanced Activity and Cycle Stability for Rechargeable Lithium Oxygen Batteries

Liu, Guoxue; Chen, Hongbin; Lu, Xia; Ding, Liang‐Xin; Li, Dongdong; Xiao, Kang; Dai, Sheng; Wang, Haihui

doi:10.1021/acsami.5b06587

Cited by 133 publications

(98 citation statements)

References 52 publications

(106 reference statements)

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“…This explains why the layered nanosphere NiO with more pore channels can effectively store the discharging products and keep the oxygen channel unobstructed. It has been found by investigation that transition metal oxides with porous structure display outstanding OER performances, owing to particular pathways [35][36][37][38] in accordance with the results of our studies. There are three probable discharge reactions in the Li-O 2 batteries and eqn (2) reveals the discharging process which has been studied.…”

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confidence: 92%

Excellent oxygen evolution reaction of NiO with a layered nanosphere structure as the cathode of lithium–oxygen batteries

et al. 2018

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A layered nanosphere structured NiO catalyst was successfully synthesized by a simple and efficient hydrothermal method as a cathode material for lithium-oxygen (Li-O 2 ) batteries. Cyclic voltammetry (CV), dual electrode voltammetry (DECV) and chronoamperometry (CA) by rotating ring-disk electrode (RRDE) were carried out to investigate the catalytic activity of this catalyst for the oxygen evolution reaction (OER). The results revealed that the layered nanosphere NiO exhibited excellent electrochemical performance, stability and a typical four-electron reaction as a cathode electrocatalyst for rechargeable nonaqueous Li-O 2 batteries. The overpotential of the NiO is only up to 0.61 V. X-ray photoelectron spectroscopy (XPS) characterization shows that the Li 2 O 2 and Li 2 CO 3 formed during the discharge process and decomposed after charging. Moreover, the cut-off voltage of discharging is about 2.0 V in the NiO-based Li-O 2 batteries, while the specific capacity is up to 3040 mA h g À1. There is no obvious performance decline of the battery after 50 cycles at a current density of 0.1 mA cm À2 with a superior limited specific capacity of 800 mA h g À1. Herein, the layered nanosphere structured NiO catalyst is considered a promising cathode electrocatalyst for Li-O 2 batteries.

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confidence: 92%

Excellent oxygen evolution reaction of NiO with a layered nanosphere structure as the cathode of lithium–oxygen batteries

et al. 2018

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“…Benefiting from this unique porous hollow nanostructure, PNT‐LSM exhibited increased ORR and OER activity, and obtained significantly improved specific capacity, round‐trip efficiency, and rate capability in a nonaqueous LAB. In a similar fashion, hollow 1D tubular structures of porous La 0.5 Sr 0.5 CoO 2.91 and hierarchical mesoporous/macroporous La 0.5 Sr 0.5 CoO 3− x perovskites were synthesized by the electrospinning technique, showing high capacity, good rate capability, and excellent cycle stability when employed in LABs . This easy and controllable approach for scale‐up synthesis of 1D perovskite nanostructures opens up a promising avenue to acquire high‐performing oxygen electrocatalysts for use in LABs.…”

Section: Nanostructured Perovskites For Electrocatalysis‐based Energymentioning

confidence: 95%

Recent Advances in Novel Nanostructuring Methods of Perovskite Electrocatalysts for Energy‐Related Applications

et al. 2018

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Perovskite oxides hold great promise as efficient electrocatalysts for various energy‐related applications owing to their low cost, flexible structure, and high intrinsic catalytic activity. However, conventional synthetic methods can only obtain perovskite catalysts with large particle sizes, small surface areas, and few morphological features, leading to limited catalytic activity and thus posing a major challenge toward real‐world applications. Reducing the size of bulk perovskites down to the nanosize represents an efficient way to improve the electrocatalytic performance. A comprehensive overview of recent progress in the nanostructuring of perovskites for catalyzing several key reactions in metal–air batteries, water splitting, and solid oxide fuel cells is provided. A range of synthetic protocols for making perovskite nanostructures are summarized, followed by an emphasis on how each method can be tailored to obtain high‐performing perovskite nanocatalysts. These recent advances highlight the enormous potential of nanosized perovskites for facilitating the electrocatalytic reactions. The remaining challenges and future directions are pointed out for the development of next‐generation perovskite‐based nanostructured catalysts.

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“…Chen et al prepared hollow nanocube-like LaNiO 3 via a modified hydrothermal process and annealing in O 2 at high temperature. [60] The fabricated Li-O 2 batteries using hollow perovskite La 0.5 Sr 0.5 CoO 3−x /KB electrodes exhibit a high specific capacity of 5799 mA h g −1 and good rate capability. The enhanced capacity and good cycle stability merited from porous structure, large specific surface area and high electrocatalytic activity of hollow LaNiO 3 nanocubes.…”

Section: Metal-air Batteries With Perovskitementioning

confidence: 95%

Section: Perovskites and Their Hollow Structuresmentioning

confidence: 99%

Hollow‐Structured Metal Oxides as Oxygen‐Related Catalysts

et al. 2018

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high overpotential and sluggish kinetics. Generally, Pt, IrO 2 , and RuO 2 noble metal catalysts have improved kinetics. But, the high cost and unsatisfactory long-term durability of noble-metal-based catalysts are the main limitations for large-scale commercial applications. Supplying flexible electronic structures, transition metal oxides are the optimal oxygen-related catalysts in which the adsorbents binding to metal cations (M) are neither too strong nor too weak. [9] With overall understanding of crystal structure for common transition metal oxides, it has been demonstrated that [MO 6 ] octahedral configuration effectively accelerates the charge transfer process during a redox reaction. [10] In the octahedral field, the transition metal 3d orbit will be split into e g and t 2g . The e g orbital directed toward an O 2 molecule overlaps the O-2p δ orbital more strongly than the overlap between the t 2g and O-2p π orbitals. It thereof determines the energy gained by both the adsorption/desorption of oxygen on transition metal ions. Furthermore, the hollow structure promotes their reaction kinetics and durability. [11,12] Here, we will focus on the hollow structures (spinels, perovskites, and rutiles) and their oxygenrelated catalysis properties. And general design strategies and precise fabrication of hollow-structured transition metal oxides for oxygen-related catalysis will be summarized. To simplify, the hollow structure discussed here is a system with independent inner voids and can be monodisperse. Advantage and Synthesis of Hollow Structures Importance of Hollow Structures in Oxygen-Related CatalysisA large surface area is critical for hollow structure in oxygenrelated catalysis. It can significantly increase the active sites and reduce the mass density of an energy conversion device. In some special systems, the consumption of co-catalysts (especially noble metal) could also be saved. [13] Meanwhile, large void size is another key feature for hollow structure. It will mitigate the effects of volume change, provide structural stability and enhance the metal-air battery cyclic performance. The interconnected channels will promote the mass transfer performance and enhance the rate capability. [14] In addition, the encapsulation ability of hollow structure can avoid catalyst poisoning and increase chemical and thermal stabilities. [15] With precise control of the geometric parameter (length, diameter, and shell thickness), a shortened charge transfer path is Metal oxide hollow structures with large surface area, low density, and high loading capacity have received great attention for energy-related applications. Acting as oxygen-related catalysts, hollow-structured transition metal oxides offer low overpotential, fast reaction rate, and excellent stability. Herein, recent progress in the oxygen-related catalysis (e.g., oxygen evolution reaction (OER), oxygen reduction reaction (ORR), and metal-air batteries) of hollow-structured transition metal oxides is discussed. Through a comprehensive outline of hollo...

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Hierarchical Mesoporous/Macroporous Perovskite La_0.5Sr_0.5CoO_3–xNanotubes: A Bifunctional Catalyst with Enhanced Activity and Cycle Stability for Rechargeable Lithium Oxygen Batteries

Cited by 133 publications

References 52 publications

Excellent oxygen evolution reaction of NiO with a layered nanosphere structure as the cathode of lithium–oxygen batteries

Excellent oxygen evolution reaction of NiO with a layered nanosphere structure as the cathode of lithium–oxygen batteries

Recent Advances in Novel Nanostructuring Methods of Perovskite Electrocatalysts for Energy‐Related Applications

Hollow‐Structured Metal Oxides as Oxygen‐Related Catalysts

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