A High Performance Ru@C4N Electrocatalyst for Hydrogen Evolution Reaction in Both Acidic and Alkaline Solutions.

We report a high performance Ru@C4N electrocatalyst for hydrogen evolution reaction in both acidic and alkaline solutions. This catalyst is synthesized by annealing a complex of covalent organic framework (COF) compound coordinated with ruthenium synthesized by a "one-pot" solvothermal method. This Ru@C4N catalyst shows excellent electrocatalytic activity toward the hydrogen evolution reaction (HER) in both acidic and alkaline solutions with very low overpotentials at 10 mA cm-2 (6 mV in 0.5 M H2SO4 solution; 7 mV in 1.0 M KOH solution), which outperform commercial catalyst Pt/C. The Ru@C4N electrocatalyst also exhibits high HER turnover frequencies of 0.93 H2 s-1 in 0.5 M H2SO4 and 0.65 H2 s-1 in 1.0 M KOH solutions at 25 mV as well as superior performance stability.