期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 622, 期 -, 页码 1020-1028出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2022.04.175
关键词
Structure evolution; Phase transformation; Electrochemical activation
资金
- National Natural Science Foun-dation of China [21673065, 21403045, 21611130177]
This study reports a three-stage strategy to reduce the sheet size of NiMn-LDH to the nanometer scale, in order to improve the structural integrity and electron/mass transfer kinetics. The combination of nanosizing and hierarchical structure resulted in superior cycling stability.
For micron-sized nickel-based hydroxides sheets, the reaction and migration of anions/water molecules in the inner region tends to lag behind those along the edge, which can cause structure mismatch and capacity degradation during cycles. Nanosizing and structure design is a feasible solution to shorten the ion/electron path and improve the reaction homogeneity. Herein, this study reports a novel three stage strategy (self-assembly of NiMn-LDH/ppy-C - reduction to NiMn/ppy-C - in situ phase transformation into NiMn/NiMn-LDH/ppy-C) to reduce the sheet size of NiMn-LDH to nanometer. Triggered by electrochemical activation, NiMn-LDH nanosheets can hereby easily and orderly grow on the exposed active (111) crystal plane of Ni to establish NiMn-LDH/NiMn heterostructure around ppy-C. Importantly, nano sizing and hierarchical structure play a synergistic role to maintain structural integrity and to promote the electron/mass transfer kinetics. The NiMn/NiMn-LDH/ppy-C composite delivers superior cycling stability with almost no decay of capacity retention after 40,000 cycles at 5 A g(-1). Our hierarchical morphology modulation provides an ingenious, efficient way to boost the performance of Ni-based layered hydroxide materials. (c) 2022 Elsevier Inc. All rights reserved.
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