Open mesoporous spherical shell structured Co3O4 with highly efficient catalytic performance in Li–O2 batteries
Open mesoporous spherical shell structured Co3O4 with highly efficient catalytic performance in Li–O2 batteries
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DOI：
10.1039/c5ta00295h
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发表时间：
2015-03
影响因子：
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通讯作者：
Fan Wang;Z. Wen;Chen Shen;Kun Rui;Xiangwei Wu;Chun-hua Chen
中科院分区：
文献类型：
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作者：
Fan Wang;Z. Wen;Chen Shen;Kun Rui;Xiangwei Wu;Chun-hua Chen
设计并通过两步反应合成了一种开孔球壳结构Co 3 O 4。OMSS Co 3 O 4由大量的（111）晶面择优暴露的纳米粒子构成，直径约为1 μm。在充电电压平台降低至103.6 V的Li-O2电池中，可表现出对析氧反应（OER）的上级催化活性。在60次循环中，截止比容量为1000 mA h g−1，循环稳定性也表现出色。其优异的循环性能可能是由于其具有高比表面积的开孔介孔球壳结构，提高了氧的传输能力，增加了放电产物的活性中心和沉积空间。它几乎获得了迄今为止报道的用于Li-O2电池的金属氧化物催化剂中最高的循环性能。
An open mesoporous spherical shell structured (OMSS) Co3O4 was designed and synthesized through a two-step process. The OMSS Co3O4 with a diameter around 1 μm is constructed from a large number of nanoparticles mainly with (111) preferential exposed crystal planes. Superior catalytic activity for oxygen evolution reaction (OER) can be manifested in Li–O2 batteries with the charge voltage platform reduced to ∼3.6 V. An outstanding performance of cycling stability was also achieved with a cut-off specific capacity of 1000 mA h g−1 over 60 cycles. The fantastic cycling performance may be attributed to the open mesoporous spherical shell structure with high specific surface area which improves the transport capability of oxygen, increases the active sites and the sedimentary space of discharge products. It almost gets the highest cycling performance among metal oxide catalysts used in Li–O2 batteries reported to date.