Unveiling surface redox charge storage of interacting two-dimensional heteronanosheets in hierarchical architectures

Nano Letters
Qasim MahmoodHo Seok Park

Abstract

Two-dimensional (2D) heteronanosheets are currently the focus of intense study due to the unique properties that emerge from the interplay between two low-dimensional nanomaterials with different properties. However, the properties and new phenomena based on the two 2D heteronanosheets interacting in a 3D hierarchical architecture have yet to be explored. Here, we unveil the surface redox charge storage mechanism of surface-exposed WS2 nanosheets assembled in a 3D hierarchical heterostructure using in situ synchrotron X-ray absorption and Raman spectroscopic methods. The surface dominating redox charge storage of WS2 is manifested in a highly reversible and ultrafast capacitive fashion due to the interaction of heteronanosheets and the 3D connectivity of the hierarchical structure. In contrast, compositionally identical 2D WS2 structures fail to provide a fast and high capacitance with different modes of lattice vibration. The distinctive surface capacitive behavior of 3D hierarchically structured heteronanosheets is associated with rapid proton accommodation into the in-plane W-S lattice (with the softening of the E2g bands), the reversible redox transition of the surface-exposed intralayers residing in the electrochemically a...Continue Reading

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Citations

Jan 14, 2017·ACS Applied Materials & Interfaces·Hadi Khani, David O Wipf
Mar 18, 2017·Chemical Reviews·Chaoliang TanHua Zhang
Apr 4, 2020·Advanced Materials·Gyoung Hwa JeongSang Ouk Kim
Mar 1, 2018·Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy·Morasae SamadiAlireza Z Moshfegh
Feb 14, 2019·Nature Communications·Maria S SokolikovaCecilia Mattevi
Apr 24, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Shweta TanwarA L Sharma
Jun 15, 2021·Chemical Science·Jiaze XieJohn S Anderson

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