Ruthenium Nanoparticles Confined in Covalent Organic Framework/Reduced Graphene Oxide As Electrocatalyst toward Hydrogen Evolution Reaction in Alkaline Media

Abstract

Developing a highly efficient, nonprecious, and stable electrocatalyst toward hydrogen evolution reaction (HER) is important for the commercialization of water splitting technologies. The rational design of porous supports can effectively increase electric conductivity, active site exposure, and electrochemical active surface area of catalysts. Herein, we proposed a facile method for HER catalyst preparation, by which ruthenium nanoparticles can be incorporated into the hybrid of two-dimensional covalent organic framework/reduced graphene oxide (COF/rGO). The catalysts were synthesized through multirefluxing steps, the covalent organic framework was first supported on reduced graphene oxide, and ruthenium nanoparticles were then confined in the COF/rGO hybrid. The resulting catalyst exhibited a high HER performance with 42 mV of overpotential at 10 mA/cm 2 and showed a low Tafel slope of 46 mV/dec in alkaline electrolyte. In addition, the catalyst exhibited good stability and durability during long-term discharging. These results indicated that the as-developing catalyst can be a viable alternative toward practical HER applications.

Extremely-Long-Lifespan and Ultrahigh-Rate Li-Ion Batteries Using Conjugated Porous Triazine Polymers

“…Referring to the reported reaction of trimeric hydrogen chloride, , the POP (named as ACT) with an abundance of active sites was designed and synthesized. The synthetic equation is illustrated in Figure .…”

2D Microporous Covalent Organic Frameworks as Cobalt Nanoparticle Supports for Electrocatalytic Hydrogen Evolution Reaction

“…The following supporting information can be downloaded at: https: //www.mdpi.com/article/10.3390/cryst12070880/s1, FT-IR spectra, TGA curves, N 2 adsorption, SEM mapping, electrochemical HER performance, and unit cell parameters (References [39][40][41][42][43] are cited in the Supplementary Materials).…”

Covalent Triazine Frameworks Decorated with Pyridine-Type Carbonitride Moieties: Enhanced Photocatalytic Hydrogen Evolution by Improved Charge Separation

“…It is significant that their aromatic rings are conjugated, which increases their capacity to absorb visible light, and that their stacked structures provide specific pathways for the transfer of photogenerated carriers [ 11 , 16 ]. The photocatalytic hydrogen evolution efficiency of CTFs is nevertheless poor due to the relatively rapid recombination rate of photogenerated charge carriers [ 17 , 18 ]. In this regard, a great deal of research effort has been devoted to retarding electron-hole recombination by means of element doping, dye-sensitization, and coupling with semiconductors.…”