Electrochemically Facile Hydrogen Evolution Using Ruthenium Encapsulated Two Dimensional Covalent Organic Framework (2D COF)

Abstract

Two dimensional covalent organic frameworks (2D COFs) are unique class of crystalline porous polymers which are formed by the covalent bonding between the organic building blocks. Their layers are stacked to each other by non-covalent interactions. The stacking sequence between the layers is highly significant towards various applications. In this article, we have prepared ruthenium ions encapsulated 2D COF (Ru@COF) from a synthesized COF. We have performed an electrochemical hydrogen evolution reaction using Ru@COF as electrocatalyst. Moreover, Ru@COF shows better electrochemical hydrogen evolution reaction (HER) activity compared to bare RuCl 3 and COF. The HER activities are measured in 1.5 M H 2 SO 4 medium. Ru@COF shows onset potential 159 mV with the Tafel slope of 79 mV dec À 1 . The linear Tafel plot with the slope 79 mV dec À 1 indicates Volmer-Heyrovsky-Tafel mechanism for the Ru@COF catalysed HER. COF plays a crucial role in maintaining stability and catalytic efficiency of the material. Interestingly, Ru@COF acts as exemplary electrocatalyst material that is used as solid binder-free cathodic electrode on glassy carbon electrode surface.

Covalent organic frameworks (COFs) for electrochemical applications

“…Furthermore, COFs can be used as support to immobilize and stabilize small nanoparticles with HER catalytic activity. 127,149 Covalent triazine frameworks (CTFs) are a chemically stable class of COFs synthesized using triazine (C 3 N 3 ) units as crosslinkers. 58,127,[150][151][152] Hu and co-workers reported a CTF@MoS 2 composite by in situ growing MoS 2 nanoparticles into the 1D channel arrays of CTFs (Fig.…”

Emissive organogel mediated construction of a flexible covalent organic polymer for the separation of aniline for water purification

“…The FT-IR spectrum of COP demonstrates the successful construction of COP via the formation of -C=N bond. [35][36][37] The peaks at 1530, 1605 cm -1 are assigned to -C=C-and -C=N bonds stretching. A peak at 1650 cm -1 is appeared due to -C(=O)NHNH-stretching band (Fig.…”

Covalent Organic Frameworks for Efficient Energy Electrocatalysis: Rational Design and Progress

“…Reproduced with permission. [ 97 ] Copyright 2019, Wiley‐VCH. k) Schematic representation of the synthesis of TpPa‐2 COF and CdS–COF hybrids.…”

“…Das and coworkers designed and synthesized an imine‐linked crystalline 2D COF through the condensation of benzene‐1,3,5‐tricarboxaldehyde and 3,4‐diaminobenzohydrazide (Figure 14f). [ 97 ] The as‐prepared 2D COF served as an ideal support for the encapsulation of ruthenium (Ru) ions to generate Ru@COF (Figure 14g,h). The resulting Ru@COF exhibited high HER activity in acidic media with an onset overpotential of 159 mV and a small Tafel slope of 79 mV dec −1 , indicating fast rate and high catalytic activity for the HER (Figure 14i–j).…”