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Ruthenium‐Functionalized Hierarchical Carbon Nanocages as Efficient Catalysts for Li‐O 2 Batteries
Author(s) -
Wang Liangjun,
Lyu Zhiyang,
Gong Lili,
Zhang Jian,
Wu Qiang,
Wang Xizhang,
Huo Fengwei,
Huang Wei,
Hu Zheng,
Chen Wei
Publication year - 2017
Publication title -
chemnanomat
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.947
H-Index - 32
ISSN - 2199-692X
DOI - 10.1002/cnma.201700023
Subject(s) - nanocages , cathode , catalysis , materials science , electrolyte , chemical engineering , nanoparticle , carbon fibers , ruthenium , lithium (medication) , current density , nanotechnology , chemistry , electrode , composite material , organic chemistry , medicine , physics , quantum mechanics , endocrinology , composite number , engineering
Developing an efficient cathode is essential to obtain high rate capability and rechargeable lithium oxygen (Li‐O 2 ) batteries. Herein, ruthenium (Ru)‐functionalized hierarchical carbon nanocages (hCNCs) are synthesized and employed as a cathode catalyst for Li‐O 2 batteries. The as‐prepared cathode exhibits high discharge capacity, low charge potential (8135 mA h g −1 with 3.85 V charge potential at a current density of 0.08 mA cm −2 ), outstanding rate capability (3416 mA h g −1 at a current density of 0.48 mA cm −2 ) and good stability up to 78 cycles at a limited capacity of 500 mA h g −1 . Such excellent battery performance is ascribed to the synergistic effect of the interconnected hierarchically porous structure of hCNCs, which can facilitate effective electrolyte immersion and efficient Li + /O 2 mass transport, and the high catalytic activity of Ru nanoparticles.