Ultrafine Mn3O4 Nanowires/Three-Dimensional Graphene/Single-Walled Carbon Nanotube Composites: Superior Electrocatalysts for Oxygen Reduction and Enhanced Mg/Air Batteries.
Ultrafine Mn3O4 Nanowires/Three-Dimensional Graphene/Single-Walled Carbon Nanotube Composites: Superior Electrocatalysts for Oxygen Reduction and Enhanced Mg/Air Batteries.
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DOI：
10.1021/acsami.6b09013
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发表时间：
2016-10
影响因子：
9.5
通讯作者：
Chunsheng Li;Yan Sun;Weihong Lai;Jiazhao Wang;S. Chou
中科院分区：
文献类型：
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作者：
Chunsheng Li;Yan Sun;Weihong Lai;Jiazhao Wang;S. Chou
探索高效的氧还原反应催化剂以改善缓慢动力学仍然是金属/空气电池先进能量转换和存储的一个巨大挑战。采用微波辐照辅助十六烷基三甲基溴化铵（CTAB）表面活性剂制备了电子转移数为3.95 （0.60 V vs Ag/AgCl）、动态电流密度为217 ~ 28.8 mA cm-2的超细Mn3O4纳米线/三维石墨烯/单壁碳纳米管催化剂，大大提高了Mg/空气电池的整体催化性能。为了匹配阴极催化剂的电化学活性，采用机械分解法制备了一种由微柿子样颗粒组成的大型Mg阳极和含有1.0 wt %三己基（十四烷基）氯化磷离子液体的Mg(NO3)2- nano2基电解质。将超细Mn3O4纳米线/三维石墨烯/单壁碳纳米管作为氧还原反应的高效电催化剂，并在新型电解质中添加Mg微/纳米级阳极，先进的Mg/空气电池在0.2 mA cm-1下具有高开路电压（1.49 V）、高平台电压（1.34 V）和长放电时间（4177 min），显示出高能量密度。因此，认为该器件配置在新型储能技术中具有很大的应用潜力。
The exploration of highly efficient catalysts for the oxygen reduction reaction to improve sluggish kinetics still remains a great challenge for advanced energy conversion and storage in metal/air batteries. In this work, ultrafine Mn3O4 nanowires/three-dimensional graphene/single-walled carbon nanotube catalysts with an electron transfer number of 3.95 (at 0.60 V vs Ag/AgCl) and kinetic current density of 21.7-28.8 mA cm-2 were developed via a microwave-irradiation-assisted hexadecyl trimethylammonium bromide (CTAB) surfactant procedure to greatly enhance the overall catalytic performance in Mg/air batteries. To match the electrochemical activity of the cathode catalysts, a large-scale Mg anode prepared with micropersimmon-like particles via a mechanical disintegrator and Mg(NO3)2-NaNO2-based electrolyte containing 1.0 wt % trihexyl(tetradecyl)phosphonium chloride ionic liquid were applied. Combining the ultrafine Mn3O4 nanowires/three-dimensional graphene/single-walled carbon nanotube as an efficient electrocatalyst for the oxygen reduction reaction and an Mg micro-/nanoscale anode in the novel electrolyte, the advanced Mg/air batteries demonstrated a high cell open circuit voltage (1.49 V), a high plateau voltage (1.34 V), and a long discharge time (4177 min) at 0.2 mA cm-1, showing a high energy density. Therefore, it is believed that this device configuration has great potential for application in new energy storage technologies.