title: Formation of nickel sulfide nanoframes from metal-organic frameworks with enhanced pseudocapacitive and electrocatalytic properties.
abstract: Nanoframe-like hollow structures with unique three-dimensional (3D) open architecture hold great promise for various applications. Current research efforts mainly focus on frame-like noble metals and metal oxides. However, metal sulfides with frame-like nanostructures have been rarely reported. Starting from metal-organic frameworks (MOFs), we demonstrate a novel structure-induced anisotropic chemical etching/anion exchange method to transform Ni-Co Prussian blue analogue (PBA) nanocubes into NiS nanoframes with tunable size. The reaction between Ni-Co PBA nanocube templates and Na2 S in solution leads to the formation of well-defined NiS nanoframes. The different reactivity between the edges and the plane surface of the Ni-Co PBA nanocubes is found to be the key factor for the formation of NiS nanoframes. Benefitting from their structural merits including 3D open structure, small size of primary nanoparticles, high specific surface area, and good structural robustness, the as-derived NiS nanoframes manifest excellent electrochemical performance for electrochemical capacitors and hydrogen evolution reaction in alkaline electrolyte.
authors.affiliation: School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459 (Singapore) http://www.ntu.edu.sg/home/xwlou/; Nano-materials and Environment Detection Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031 (PR China).
authors.forename: Xin-Yao
authors.initials: XY
authors.lastname: Yu
authors.forename: Le
authors.initials: L
authors.lastname: Yu
authors.forename: Hao Bin
authors.initials: HB
authors.lastname: Wu
authors.forename: Xiong Wen David
authors.initials: XW
authors.lastname: Lou
keywords: ion exchange; metal-organic frameworks; nanoframes; nanostructures; nickel sulfide