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Self‐Assembled 3D Foam‐Like NiCo 2 O 4 as Efficient Catalyst for Lithium Oxygen Batteries
Author(s) -
Liu Lili,
Wang Jun,
Hou Yuyang,
Chen Jun,
Liu HuaKun,
Wang Jiazhao,
Wu Yuping
Publication year - 2016
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201502924
Subject(s) - bifunctional , catalysis , lithium (medication) , electrolyte , materials science , oxygen evolution , cathode , chemical engineering , oxygen , electrode , aqueous solution , clark electrode , electrochemistry , nanotechnology , inorganic chemistry , chemistry , organic chemistry , medicine , engineering , endocrinology
A self‐assembled 3D foam‐like NiCo 2 O 4 catalyst has been synthesized via a simple and environmental friendly approach, wherein starch acts as the template to form the unique 3D architecture. Interestingly, when employed as a cathode for lithium oxygen batteries, it demonstrates superior bifunctional electrocatalytic activities toward both the oxygen reduction reaction and the oxygen evolution reaction, with a relatively high round‐trip efficiency of 70% and high discharge capacity of 10 137 mAh g −1 at a current density of 200 mA g −1 , which is much higher than those in previously reported results. Meanwhile, rotating disk electrode measurements in both aqueous and nonaqueous electrolyte are also employed to confirm the electrocatalytic activity for the first time. This excellent performance is attributed to the synergistic benefits of the unique 3D foam‐like structure and the intrinsically high catalytic activity of NiCo 2 O 4 .