title: Array of nanosheets render ultrafast and high-capacity Na-ion storage by tunable pseudocapacitance.
abstract: Sodium-ion batteries are a potentially low-cost and safe alternative to the prevailing lithium-ion battery technology. However, it is a great challenge to achieve fast charging and high power density for most sodium-ion electrodes because of the sluggish sodiation kinetics. Here we demonstrate a high-capacity and high-rate sodium-ion anode based on ultrathin layered tin(II) sulfide nanostructures, in which a maximized extrinsic pseudocapacitance contribution is identified and verified by kinetics analysis. The graphene foam supported tin(II) sulfide nanoarray anode delivers a high reversible capacity of ∼1,100 mAh g(-1) at 30 mA g(-1) and ∼420 mAh g(-1) at 30 A g(-1), which even outperforms its lithium-ion storage performance. The surface-dominated redox reaction rendered by our tailored ultrathin tin(II) sulfide nanostructures may also work in other layered materials for high-performance sodium-ion storage.
authors.affiliation: School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore.
authors.forename: Dongliang
authors.initials: D
authors.lastname: Chao
authors.affiliation: School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore.
authors.forename: Changrong
authors.initials: C
authors.lastname: Zhu
authors.affiliation: School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore.
authors.forename: Peihua
authors.initials: P
authors.lastname: Yang
authors.affiliation: State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China.
authors.forename: Xinhui
authors.initials: X
authors.lastname: Xia
authors.affiliation: School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore.
authors.forename: Jilei
authors.initials: J
authors.lastname: Liu
authors.affiliation: Energy Research Institute @ NTU, Nanyang Technological University, Singapore 639798, Singapore.
authors.forename: Jin
authors.initials: J
authors.lastname: Wang
authors.affiliation: College of Materials Science and Engineering, Jilin University, Changchun 130012, China.
authors.forename: Xiaofeng
authors.initials: X
authors.lastname: Fan
authors.affiliation: Department of Chemistry, Moscow State University, Moscow 119992, Russia.
authors.forename: Serguei V
authors.initials: SV
authors.lastname: Savilov
authors.affiliation: Energy Research Institute @ NTU, Nanyang Technological University, Singapore 639798, Singapore.
authors.forename: Jianyi
authors.initials: J
authors.lastname: Lin
authors.affiliation: School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore.
authors.forename: Hong Jin
authors.initials: HJ
authors.lastname: Fan
authors.affiliation: School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore.|Energy Research Institute @ NTU, Nanyang Technological University, Singapore 639798, Singapore.
authors.forename: Ze Xiang
authors.initials: ZX
authors.lastname: Shen