单层镍锰层状双金属氢氧化物用于锂-氧电池双功能催化剂

将块体镍锰层状双金属氢氧化物(Ni_3Mn-LDHs)通过液相剥离法制备成单层Ni_3Mn-LDHs,然后采用自组装法获得Ni_3MnLDHs/CNT复合材料。采用X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)对复合材料的结构进行分析,通过恒流充放电、循环伏安(CV)和电化学阻抗谱(EIS)研究电极的电化学过程。结果表明:Ni_3Mn-LDHs/CNT复合材料可以有效提升ORR和OER的催化活性,与CNT正极相比较,Ni_3Mn-LDHs/CNT正极在锂-氧电池中的放电容量提高了近300%,并且具有优异的倍率性能和循环稳定性。

Single-Layer Ni3Mn-Layered Double Hydroxides as Bifunctional Catalyst for Rechargeable Li-O2 Batteries

Bulk Ni₃Mn-layered double hydroxides (Ni₃Mn-LDHs) was exfoliated into single-layer Ni₃Mn-LDHs nanosheets via liquid phase exfoliation, and then incorporated with CNT to obtain Ni₃Mn-LDHs/CNT composites by self-assemble method. The structure of the composites was characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The electrochemical process was analyzed by galvanostatic tests, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The Ni₃Mn-LDHs/CNT composites improved the ORR and OER catalytic activities significantly, the obtained Ni₃Mn-LDHs/CNT cathode presented nearly 300% higher discharge capacity, excellent rate and cycling stability than the CNT cathode in lithium-oxygen batteries.