A Single-Crystal Open-Capsule Metal–Organic Framework

• DOI: 10.1021/jacs.9b02417
• Publication Date: 2019-05-01T19:34:37Z
• Authors: Yong-Sheng Wei; Mei Zhang; Mitsunori Kitta; Zheng Liu; Satoshi Horike; Qiang Xu
• Keywords: Phosphide; Carbon fibers; Nanocapsules

Micro-/nanocapsules have received substantial attention due to various potential applications for storage, catalysis, and drug delivery. However, their conventional enclosed non-/polycrystalline walls pose huge obstacles rapid loading mass diffusion. Here, we present a new single-crystal capsular-MOF with openings on the wall, which is carefully designed at molecular level constructed from crystal-structure transformation. This rare open-capsule MOF can easily load largest amounts of sulfur iodine among known MOFs. In addition, derived melamine through pyrolysis-phosphidation, fabricated nitrogen-doped capsular carbon-based framework iron-nickel phosphide nanoparticles immobilized carbons interconnected by plentiful carbon nanotubes. Benefiting synergistic effects between highly surface-exposed sites, material exhibits efficient multifunctional electrocatalysis oxygen evolution, hydrogen reduction, achieving well-qualified assemblies an overall water splitting (low 1.59 V 10 mA·cm-2) rechargeable Zn-air battery (high peak power density 250 mW·cm-2 excellent stability 500 h), afford remarkably practical prospects over previously electrocatalysts.