application of pd-substituted ni-al layered double hydroxides for the hydrogen evolution reaction

Production of hydrogen from electrochemical water splitting is known as a green method of fuel production. in this work, electrocatalytic hydrogen evolution reaction (her) was investigated for newly prepared layered double hydroxides (ldh) inacidic solution. nial ldh/cb (carbon black) ldh was monitored using x-raydiffraction (xrd), fourier transform infrared (ft-ir) spectroscopy, and scanning electron microscopy (sem). the substitution of nickel ions with palladium ones was recorded using energy dispersive x–ray spectroscopy (edx). moreover, thenial-ldh/cb and palladium substituted ldh were examined for the her atdifferent times of substitution. the modified nial ldh/cb/pd/gce (glass carbon electrode) represented low overpotential of -0.55 v (vs. ag/agcl), tafel slope of 125 mv/dec, charge transfer coefficient of 0.47, exchange current of 2.56 μa, as well as excellent long-term stability. moreover, the substitution effect of palladium ions on the modification of prepared ldh gce was satisfactorily studied for the her in 0.5 mol l-1 h2so4 using electrochemical impedance spectroscopy (eis).