title: Pseudocapacitive Na-Ion Storage Boosts High Rate and Areal Capacity of Self-Branched 2D Layered Metal Chalcogenide Nanoarrays.
abstract: The abundant reserve and low cost of sodium have provoked tremendous evolution of Na-ion batteries (SIBs) in the past few years, but their performances are still limited by either the specific capacity or rate capability. Attempts to pursue high rate ability with maintained high capacity in a single electrode remains even more challenging. Here, an elaborate self-branched 2D SnS2(B-SnS2) nanoarray electrode is designed by a facile hot bath method for Na storage. This interesting electrode exhibits areal reversible capacity of ca. 3.7 mAh cm-2(900 mAh g-1) and rate capability of 1.6 mAh cm-2(400 mAh g-1) at 40 mA cm-2(10 A g-1). Improved extrinsic pseudocapacitive contribution is demonstrated as the origin of fast kinetics of an alloying-based SnS2electrode. Sodiation dynamics analysis based on first-principles calculations, ex-situ HRTEM, in situ impedance, and in situ Raman technologies verify the S-edge effect on the fast Na+migration and reversible and sensitive structure evolution during high-rate charge/discharge. The excellent alloying-based pseudocapacitance and unsaturated edge effect enabled by self-branched surface nanoengineering could be a promising strategy for promoting development of SIBs with both high capacity and high rate response.
authors: School of Physical and Mathematical Sciences, Nanyang Technological University , 637371, Singapore.
authors: Dongliang
authors: D
authors: Chao
authors: College of Optical and Electronic Technology, China Jiliang University , Hangzhou 310038, China.
authors: Pei
authors: P
authors: Liang
authors: Energy Research Institute, Nanyang Technological University , 637553, Singapore.
authors: Zhen
authors: Z
authors: Chen
authors: School of Physical and Mathematical Sciences, Nanyang Technological University , 637371, Singapore.
authors: Linyi
authors: L
authors: Bai
authors: School of Physical and Mathematical Sciences, Nanyang Technological University , 637371, Singapore.
authors: He
authors: H
authors: Shen
authors: Key Laboratory for Photonic and Electric Bandgap Materials, Heilongjiang University of Science and Technology , Harbin 150022, China.|School of Chemistry and Chemical Engineering, Harbin Institute of Technology , Harbin 150001, China.
authors: Xiaoxu
authors: X
authors: Liu
authors: State Key Laboratory of Silicon Materials, Zhejiang University , Hangzhou 310027, China.
authors: Xinhui
authors: X
authors: Xia
authors: School of Physical and Mathematical Sciences, Nanyang Technological University , 637371, Singapore.
authors: Yanli
authors: Y
authors: Zhao
authors: Department of Chemistry, Moscow State University , Moscow 119992, Russia.
authors: Serguei V
authors: SV
authors: Savilov
authors: Energy Research Institute, Nanyang Technological University , 637553, Singapore.
authors: Jianyi
authors: J
authors: Lin
authors: School of Physical and Mathematical Sciences, Nanyang Technological University , 637371, Singapore.|Energy Research Institute, Nanyang Technological University , 637553, Singapore.
authors: Ze Xiang
authors: ZX
authors: Shen
keywords: 2D layered SnS2; high rate and areal capacity; pseudocapacitance; self-branched structure; sodium-ion battery; unsaturated-edge effect