Efficient Metal‐Oriented Electrodeposition of a Co‐Based Metal‐Organic Framework with Superior Capacitive Performance

Abstract

An efficient cathodic electrodeposition method is developed for coating Co-based metal-organic frameworks (Co-MOF) on carbon fiber cloth (CFC), a widely used substrate in energy fields. The use of a highly active Co metal surface enables nucleation and growth of Co-MOF in 3D rodlike crystal bundles. When used as a binder-free electrode (Co-MOF/CFC) for supercapacitors, it shows a high areal capacitance of 1784 mF cm À 2 at 1 mA cm À 2 , good cycling stability and excellent rate capability. The assembled asymmetric all-solid-state supercapacitor device (Co-MOF/CFC//AC) delivers a high energy density and power density. This work may open up an effective approach to realize the electrosynthesis of MOF films, promoting use in energy storage and conversion fields.

Metal–organic frameworks on versatile substrates

“…In addition, other reports like ref. 144–146 also reported the growth of MOFs on carbon fiber substrates. Polydopamine (PDA) is a classical type of organic polymer because it is easy to deposit on the surface of various substrates, forming a thin layer with controllable thickness, which is beneficial for the modification of the substrate surface.…”

Fabrication of well-aligned Co-MOF arrays through a controlled and moderate process for the development of a flexible tetrabromobisphenol A sensor

“…Multiple studies have shown that the array of well-aligned electrode materials grown directly on the current collector not only simplifies the electrode fabrication process but also increases the electrode-electrolyte contact area for adequate electrochemical reaction with the substance to be detected. 34,35 However, the construction of synergistic and wellaligned MOF-based arrays is still a great challenge.…”

In situ growth of binder-free CoNi0.5-MOF/CC electrode for high-performance flexible solid-state supercapacitor application

“…22 To develop a high-performance MOF electrode, Wallace and co-workers pretreated the commercial CC and activated it in H 2 SO 4 /HNO 3 mixture at 70 °C for 3 hours, then by electrodeposition process, they successfully prepared the Co-MOF on pretreated CC, and the electrode showed superior capacitive performance. 23 However, to date, most carbon fibers or CC need to be treated with nitric acid or other strong corrosive fluids before their use as an electrode substrate, resulting in high energy demand and environmental contamination. Furthermore, natural and synthetic fabrics are typically passive in terms of electronic transmission, and the binding force between the load material and the textile is rather modest, as the physical contact interface is typically facilitated by van der Waals forces.…”