Coxmonyozhw Microrods Grown on Ni Foam for Large-Current-Density Alkaline Hydrogen Evolution with Ultralow Overpotential

Hydrogen is presumed to be the most promising energy carrier for sustainable energy. Herein, electrodes were made by thermal ammonolysis of CoMoO4 center dot nH(2)O microrods (MRs) supported on Ni foam (NF) at 300-700 degrees C, which is denoted as CoxMoNyOzHw MRs@NF-T (T = 300-700). The HER performances of these electrodes were studied in 1.0 M KOH at room temperature. The best of these electrodes, the CoxMoNyOzHw MRs@NF-550, was fully characterized and investigated. It exhibits the lowest overpotential of 12 and 41 mV, respectively at the current density of 10 and 280 mA cm(-2), which are much lower than those of the Pt/C@NF electrode (49 and 172 mV, respectively.). Such performance makes it one of the best HER electrodes. Remarkably, although its surface composition changed significantly after 50-130 h HER at 200 mA cm(-2), the HER activity further improved in terms of overpotential. This work provided a method for the preparation of highly efficient NF-supported CoxMoNyOzHw electrodes.