Site‐Selective Synthesis of Janus‐type Metal‐Organic Framework Composites

Abstract

Herein, bipolar electrochemistry is applied in a straightforward way to the site-selective in situ synthesis of metal-organic framework (MOF) structures, which have attracted tremendous interest in recent years because of their significant application potential, ranging from sensing to gas storage and catalysis. The novelty of the presented work is that the deposit can be intentionally confined to a defined area of a substrate without using masks or templates. The intrinsic site-selectivity of bipolar electrochemistry makes it a method of choice to generate, in a highly controlled way, hybrid particles that may have different functionalities combined on the same particle. The wireless nature of electrodeposition allows the potential for mass production of such Janus-type objects.

Hybrid Energy Storage Devices Based on Monolithic Electrodes Containing Well-defined TiO2 Nanotube Size Gradients

“…Bipolar electrochemistry, [26][27][28][29][30] is a relatively new research topic which nevertheless has attracted significant attention as a means of fabricating molecular gradients on surface, [31] redox gradients within conducting polymer layer, [32] template-less metal-organic frameworks, [33] and, very recently, anodic TiO 2 nanotube arrays containing size gradients [25]. The present free-standing TiO 2 nanotube electrodes, which are employed as monolithic electrodes in Li-ion batteries, contain extended (i.e.…”

Oxygen‐Assisted Cathodic Deposition of Zeolitic Imidazolate Frameworks with Controlled Thickness

“…These variables,h owever,a re critically important for structure integration and performance optimization in (especially device) applications. [8,9] MOFs could be deposited on the electrode surface anodically [12] or cathodically. [13] In cathodic deposition, reduction of some special molecules or ions (e.g.n itrate ions) on electrode surface results in an increase in pH, which promotes the deprotonation of organic ligands and induces the formation of MOFs.Atfirst glance,cathodic deposition appears to be attractive for the direct synthesis of MOFs on conductive substrates.H owever,r eports on the cathodic deposition of MOFs are comparably few.The challenge arises from the more negative reduction potential of nitrate ions relative to those of some important metal ions,f or example, Zn II ,C o II ,a nd Cu II ,w hich constitute the most extensively studied MOFs.…”

Self‐assembly of metal–organic framework thin films containing metalloporphyrin and their photocatalytic activity under visible light

“…Recently, MOF thin films have been prepared by microwave‐induced thermal deposition, dip coating, electrochemical deposition, electrophoretic deposition, layer‐by‐layer (LbL) deposition, solvothermal method, etc. LbL deposition, as the most notable approach, involves deposition of alternating solutions of structural components onto functionalized substrates.…”

“…[4] Besides retaining the advantages of MOF materials, MOFs containing metalloporphyrins also exhibit special catalytic activity sustainably by avoiding degradation. [5] Recently, MOF thin films have been prepared by microwaveinduced thermal deposition, [6] dip coating, [7] electrochemical deposition, [8][9][10][11] electrophoretic deposition, [12] layer-by-layer (LbL) deposition, [13] solvothermal method, [14,15] etc. LbL deposition, as the most notable approach, involves deposition of alternating solutions of structural components onto functionalized substrates.…”