One-pot fabrication of yolk–shell structured La0.9Sr0.1CoO3 perovskite microspheres with enhanced catalytic activities for oxygen reduction and evolution reactions

Bie, Shiyu; Zhu, Yongqiang; Su, Jianmin; Jin, Chao; Liu, Shanhu; Yang, Ruizhi; Wu, Jiao

doi:10.1039/c5ta05271h

Cited by 75 publications

(42 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nonetheless, the annealing temperature can be significantly lowered by several hundred degrees using the hydrothermal method compared to the sol–gel process . In addition, hydrothermal synthesis helps in processing perovskite oxides with various morphologies such as nanocubes, nanorods, nanospheres, and yolk–shell nanostructures, other than just nanoparticles compared to the sol–gel process . More importantly, the hydrothermal method acts as one of the most attractive techniques for fabricating nanohybrid materials, for example, perovskite oxides composited with undoped graphene or heteroatom‐doped graphene .…”

Section: Synthetic Methods Of Nanostructured Perovskitesmentioning

confidence: 99%

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

et al. 2018

View full text Add to dashboard Cite

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.

show abstract

Section: Synthetic Methods Of Nanostructured Perovskitesmentioning

confidence: 99%

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

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Electrocatalysts exhibit notable structure‐dependent performance; thus, in order to facilitate the electrocatalytic performance, another popular used strategy is to design materials with abundant mesoporous structure (large specific surface area) to expose more active sites. Furthermore, it could also promote the adsorption of reactants and intermediates on the surface of catalysts, minimize the diffusion between electron and reactants and intermediates, enhance mass transport, and thus enhancing the electrochemical kinetics . Accordingly, the more pores (especially rich mesopores) on the electrocatalysts, the better performance could be achieved.…”

Section: Creating More Active Sitesmentioning

confidence: 99%

Rational Design of Transition Metal‐Based Materials for Highly Efficient Electrocatalysis

2018

View full text Add to dashboard Cite

Electrocatalysts play critical roles in the renewable electrochemical energy storage and conversion systems. The conventional noble metal‐based electrocatalysts cannot satisfy the demand of large‐scale manufacturing due to their high‐price and scarce reserves in the earth. Therefore, rational designing of transition metal‐based materials to endow high activity, selectivity, stability, and low cost has been regarded as an alternative of noble metal‐based materials. Here, recent effective and facile strategies to rationally design transition metal‐based electrocatalysts, such as increasing the number active sties, improving the utilization of active sites (atomic‐scale catalysts), modulating the electron configurations, as well as controlling the lattice facets, for oxygen reduction reaction, oxygen evolution reaction, hydrogen evolution reaction, and CO2 reduction reaction, are summarized. It is believed that based on the understanding of fundamental design principles, well‐designed non‐noble metal and even metal free electrocatalysts would further make the electrochemical energy conversion and storage great promise in the future.

show abstract

“…Due to the flexible crystal structure, the e g number of perovskites could be easily tuned through doping in both A-site and B-site (even the O-site). 5 [57] Copyright 2015, The Royal Society of Chemistry. A similar conclusion can be reached from the Tafel slopes (Tables 1 and 2) which is less affected by surface area.…”

Section: Perovskites and Their Hollow Structuresmentioning

confidence: 99%

“…Its maximum cathodic current density reaches 6.4 mA cm −2 at 900 mV (vs Ag/AgCl) in 2500 rpm and a 4e − pathway is dominant for ORR. [57] The shell number could be controlled by using different solvents. [55] The oxygen reduction current of hollow La 0.8 Sr 0.2 MnO 3 showed six times higher activity than that of the bulk catalysts.…”

Section: Orr With Perovskitesmentioning

confidence: 99%

Hollow‐Structured Metal Oxides as Oxygen‐Related Catalysts

et al. 2018

View full text Add to dashboard Cite

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...

show abstract

One-pot fabrication of yolk–shell structured La_0.9Sr_0.1CoO₃ perovskite microspheres with enhanced catalytic activities for oxygen reduction and evolution reactions

Abstract: Yolk–shell structured La0.9Sr0.1CoO3 perovskite microspheres with enhanced catalytic activities for oxygen reduction and evolution reactions have been prepared through a one-pot fabrication pathway.

Cited by 75 publications

References 37 publications

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

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

Rational Design of Transition Metal‐Based Materials for Highly Efficient Electrocatalysis

Hollow‐Structured Metal Oxides as Oxygen‐Related Catalysts

Contact Info

Product

Resources

About