Fe(TCNQ)2 Nanorod Array: A Conductive Non-Noble-Metal Electrocatalyst toward Water Oxidation in Alkaline Media

It is extremely desired to develop cost-effective and high efficient water oxidation electrocatalysts in alkaline electrolytes. In this Letter, we report the topotactic conversion of Cu(tetracyanoquinodimethane) nanoarray, denoted as Cu(TCNQ), into Fe(TCNQ)(2) nanoarray via low temperature cationic exchange. As a 3D electrode, such Fe(TCNQ)(2) possesses superior oxygen evolution reaction (OER) performance needing over-potentials as low as 321 and 353 mV to afford 20 and 50 mA cm(-2) in 1.0 M KOH, respectively. Remarkably enough, such a catalyst shows good durability in the long term electrochemical process with its catalytic activity being retained for 25 h at lowest. This work demonstrates that Fe(TCNQ)(2) nanoarray may open up new possibilities for OER application.