Coupling MoSe2 with Non-Stoichiometry Ni0.85 Se in Carbon Hollow Nanoflowers for Efficient Electrocatalytic Synergistic Effect on Li-O2 Batteries.
Coupling MoSe2 with Non-Stoichiometry Ni0.85 Se in Carbon Hollow Nanoflowers for Efficient Electrocatalytic Synergistic Effect on Li-O2 Batteries.
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DOI：
10.1002/smll.202304882
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发表时间：
2023-10
期刊：
影响因子：
13.3
通讯作者：
Yuxin Long;Qiang Li;Zidong Zhang;Qingxi Zeng;Dong Liu;Lanling Zhao;Yao Liu;Yebing Li;Yiming Zhang;K. Ji;Zhaorui Zhou;Xue Han;Jun Wang
中科院分区：
文献类型：
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作者：
Yuxin Long;Qiang Li;Zidong Zhang;Qingxi Zeng;Dong Liu;Lanling Zhao;Yao Liu;Yebing Li;Yiming Zhang;K. Ji;Zhaorui Zhou;Xue Han;Jun Wang
与目前的锂离子电池相比，锂离子电池可以提供超高的理论能量密度。然而，Li-O2电池中缓慢的正极反应动力学限制了其电催化性能。为此，将MoSe2和Ni0.85Se纳米片修饰在碳中空纳米花中，作为Li-O2电池的正极催化剂。六方相Ni0.85Se和MoSe与同一空间群具有良好的结构相容性，具有稳定的异质结构。不饱和原子和内建电场在多相结构上的协同作用暴露了丰富的催化活性中心，加速了离子和电荷的传输，并赋予了优异的电化学活性，包括高比容量和稳定的循环性能。更重要的是，Ni0.85Se(101)面和MoSe2(100)面的晶格间距与Li2O2(100)面的晶格距离高度匹配，有利于Li2O2的外延生长，以及循环过程中放电产物的形成和分解。这种利用非化学计量化合物建立异质结并提高锂-O2电池性能的策略有望应用于其他能量存储或转换系统。
Li-O2 batteries could deliver ultra-high theoretical energy density compared to current Li-ion batteries counterpart. The slow cathode reaction kinetics in Li-O2 batteries, however, limits their electrocatalytic performance. To this end, MoSe2 and Ni0.85 Se nanoflakes were decorated in carbon hollow nanoflowers, which were served as the cathode catalysts for Li-O2 batteries. The hexagonal Ni0.85 Se and MoSe2 show good structural compatibility with the same space group, resulting in a stable heterogeneous structure. The synergistic interaction of the unsaturated atoms and the built-in electric fields on the heterogeneous structure exposes abundant catalytically active sites, accelerating ion and charge transport and imparting superior electrochemical activity, including high specific capacities and stable cycling performance. More importantly, the lattice distances of the Ni0.85 Se (101) plane and MoSe2 (100) plane at the heterogeneous interfaces are highly matched to that of Li2 O2 (100) plane, facilitating epitaxial growth of Li2 O2 , as well as the formation and decomposition of discharge products during the cycles. This strategy of employing nonstoichiometric compounds to build heterojunctions and improve Li-O2 battery performance is expected to be applied to other energy storage or conversion systems.