title: Perovskite-Type LaSrMnO Electrocatalyst with Uniform Porous Structure for an Efficient Li-O2 Battery Cathode.
abstract: Perovskite is an excellent candidate as low cost catalyst for Li-O2 cells. However, the limited porosity, which impedes molecular transport, and the inherent low electronic conductivity are the main barriers toward production of high-performance electrodes. Here, we designed a hierarchical porous flexible architecture by coating thin mesoporous yet crystalline LaSrMnO layers throughout a graphene foam to form graphene/meso-LaSrMnO sandwich-like nanosheets. In this well-designed system, the macropore between nanosheets facilitates O2 and Li(+) diffusion, the mesopore provides large surface area for electrolyte immersion and discharge products deposition, the perovskite phase catalyst decreases reactive overpotential, and the graphene serves as conductive network for electrons transport. When used as a freestanding electrode of Li-O2 cell, it shows high specific capacity, superior rate capability, and cyclic stability. Combination of mesoporous perovskites with conductive graphene networks represents an effective strategy for developing efficient electrodes in various energy storage systems.
authors.affiliation: Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University , Wuhan 430072, China.
authors.forename: Yanbing
authors.initials: Y
authors.lastname: Yang
authors.affiliation: State Key Laboratory of Material Processing and Die&Mold Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology , Wuhan, Hubei 430074, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Yin
authors.affiliation: Department of Materials Science and Engineering, College of Engineering, Peking University , Beijing 100871, China.
authors.forename: Shiting
authors.initials: S
authors.lastname: Wu
authors.affiliation: Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University , Wuhan 430072, China.
authors.forename: Xiangdong
authors.initials: X
authors.lastname: Yang
authors.affiliation: Department of Materials Science and Engineering, College of Engineering, Peking University , Beijing 100871, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Xia
authors.affiliation: State Key Laboratory of Material Processing and Die&Mold Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology , Wuhan, Hubei 430074, China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Shen
authors.affiliation: State Key Laboratory of Material Processing and Die&Mold Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology , Wuhan, Hubei 430074, China.
authors.forename: Yunhui
authors.initials: Y
authors.lastname: Huang
authors.affiliation: Department of Materials Science and Engineering, College of Engineering, Peking University , Beijing 100871, China.
authors.forename: Anyuan
authors.initials: A
authors.lastname: Cao
authors.affiliation: Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University , Wuhan 430072, China.
authors.forename: Quan
authors.initials: Q
authors.lastname: Yuan
keywords: LaSrMnO; LiO2 cell; graphene; mesoporous; perovskite