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Title: Unveiling Surface Redox Charge Storage of Interacting Two-Dimensional Hetero-Nanosheets in Hierarchical Architectures

Journal Article · · Nano Letters
DOI:https://doi.org/10.1021/nl504200y· OSTI ID:1176999
 [1];  [2];  [3];  [4];  [2];  [5];  [1];  [6];  [4]
  1. Department of Chemical Engineering, College of Engineering, Kyung Hee University (Republic of Korea)
  2. Brookhaven National Laboratory (BNL), Upton, NY (United States)
  3. Beamline Research Division, Pohang Accelerator Laboratory, Pohang (Republic of Korea)
  4. School of Chemical Engineering, Sungkyunkwan University (SKKU), Suwon (Republic of Korea)
  5. Department of Energy Engineering, Department of Chemistry, and Low Dimensional Carbon Materials Center, Ulsan National Institute of Science and Technology(UNIST) (Republic of Korea)
  6. Department of Materials Science and Engineering Materials Research Laboratory and Beckman Institute, University of Illinois at Urbana−Champaign, Urbana, Illinois (United States)

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 active 1T phase of WS2 (with the reversible change in the interatomic distance and peak intensity of W–W bonds), and the change in the oxidation state during the proton insertion/deinsertion process. This proposed mechanism agrees with the dramatic improvement in the capacitive performance of the two heteronanosheets coupled in the hierarchical structure.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
SC00112704
OSTI ID:
1176999
Report Number(s):
BNL-107668-2015-JA; R&D Project: MA453MAEA; VT1201000
Journal Information:
Nano Letters, Vol. 15; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 72 works
Citation information provided by
Web of Science

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Engineering 2D Architectures toward High-Performance Micro-Supercapacitors journal August 2018
Study on the flammability, thermal stability and diffusivity of polyethylene nanocomposites containing few layered tungsten disulfide (WS 2 ) functionalized with metal oxides journal January 2018
Solution-Processed Two-Dimensional Metal Dichalcogenide-Based Nanomaterials for Energy Storage and Conversion journal April 2016
Achieving high energy density and high power density with pseudocapacitive materials journal October 2019
Rational Design of Hierarchically Open‐Porous Spherical Hybrid Architectures for Lithium‐Ion Batteries journal December 2018
Ternary Composite Nanosheets with MoS 2 /WS 2 /Graphene Heterostructures as High-Performance Cathode Materials for Supercapacitors journal February 2018
Towards thermally stable high performance lithium-ion batteries: the combination of a phosphonium cation ionic liquid and a 3D porous molybdenum disulfide/graphene electrode journal January 2018
CuS Microspheres with Tunable Interlayer Space and Micropore as a High-Rate and Long-Life Anode for Sodium-Ion Batteries journal May 2018
Construction of NiCo 2 S 4 @NiMoO 4 Core-Shell Nanosheet Arrays with Superior Electrochemical Performance for Asymmetric Supercapacitors journal November 2018
Defect‐Rich Graphene Architecture Induced by Nitrogen and Phosphorus Dual Doping for High‐Performance Supercapacitors journal September 2019
Three-dimensional ordered porous electrode materials for electrochemical energy storage journal March 2019
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Formation of large area WS 2 nanosheets using an oxygen-plasma assisted exfoliation suitable for optical devices journal August 2019
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