Ligand Stabilization Strategy Boosted Electrode Kinetics in Cyanide Metal Organic Framework for Electrocatalytic Oxygen Evolution Reaction

Abstract

AbstractCyanide bridged frameworks are excellent pre‐catalysts towards oxygen evolution reaction. Control the hydrolysis product is crucial for design of highly active catalyst. Herein, we introduced pyrazine molecules pillared Hofmann‐type metal organic framework electrocatalysts. The in‐situ formed amorphous hydroxide provided high electrocatalytic activity and the interplanar pyrazine molecule offered structural stability towards alkaline environment, which effectively boosted the OER catalytic activity by offering more accessible active sites. The enhanced structural stability was justified by Raman spectroscopy. The overpotential, Tafel slope, and turn over frequency of the as‐synthesized Hofmann‐type MOF reached 306 mV, 15.6 mV dec−1 and 0.12 s−1, which is significantly better than that of Prussian blue analogue. This work justified the effectiveness of the ligand stabilization strategy in boosting the activity in OER catalysts.