Si trova su / Altri legami
© 2021 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited.FeCoxNiyB nanoparticles with tuned cationic ratio integrated on Vertically Aligned Boron–doped Graphene Array (FeCoxNiyB@B–VG) electrocatalysts towards water splitting are successfully prepared by electroless plating. For a specific composition, FeCo66.7Ni33.3B@B–VG electrocatalyst exhibits the highest electrocatalytic activity towards hydrogen evolution reaction, with low overpotentials of 125 and 157 mV at η 10 and small Tafel slopes of 52 and 47 mV dec–1 in 1.0 M KOH and 0.5 M H2SO4 solution, respectively. FeCo66.7Ni33.3B@B–VG electrocatalyst displays remarkable catalytic activity towards oxygen evolution reaction by showing low overpotentials of 200 and 569 mV at η 10 and small Tafel slopes of 34 and 225 mV dec–1 in 1.0 M KOH and 0.5 M H2SO4 solution, respectively. The result of stability test exhibits that FeCo66.7Ni33.3B@B–VG electrocatalyst has long–term stability for at least 10 h towards water splitting in a wide pH range. And the faraday efficiency of FeCo66.7Ni33.3B@B–VG towards water splitting is around 90%. This study helps to explore the effect of variable cationic ratio in the fabrication of non–noble electrocatalyst to achieve enhanced electrocatalytic activity for water splitting in a wide pH range.
