Cation exchange formation of prussian blue analogue submicroboxes for high-performance Na-ion hybrid supercapacitors. (September 2017)

• Record Type: Journal Article
• Authors: Wang, Jian-Gan; Zhang, Zhiyong; Zhang, Xingyuan; Yin, Xuemin; Li, Xu; Liu, Xingrui; Kang, Feiyu; Wei, Bingqing
• Is Part Of: Nano energy. Volume 39(2017:Sep.)
• Page Start: 647
• Page End: 653
• Publication Date: 2017-09
• Subjects: Prussian blue -- Hollow structure -- Hybrid supercapacitor -- High performance; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2017.07.055
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Prussian blue (PB) and its analogues (PBA) are promising in energy-related applications. However, it is an extreme challenge to fabricate the hollow structures of PB/PBA materials. Herein, we propose a versatile synthetic protocol of cation exchange to prepare PBA submicroboxes with distinct hollow structures. Cobalt hexacyanoferrate (CoHCF) submicroboxes are exemplified as advanced electrode materials to demonstrate the efficient synthesis, which exhibit a high specific capacitance of 292 F g −1 in the neutral Na2 SO4 aqueous electrolyte. Na-ion hybrid supercapacitor constructed with the CoHCF submicroboxes as the positive electrode and activated carbon as the negative electrode can work in a reversible and stable operating voltage as high as 2.0 V in an aqueous electrolyte, thereby rendering outstanding electrochemical properties, a high energy density of 42.5 Wh kg −1, a high power density of 21.1 kW kg −1, and long cycling stability with a capacitance loss of 10% after 5000 cycles. More significantly, our method can be extended to rationally synthesize different kinds of PB/PBA hollow structures for a broad range of potential applications. Graphical abstract: Highlights: Prussian blue analogues with hollow structure is prepared by cation exchange method. Cobalt hexacyanoferrate submicroboxes show excellent electrochemical performance. Na-ion hybrid supercapacitors deliver a high energy density of 42.5 Wh kg −1 . The hybrid cell exhibits high power density and long cycling stability.