NiCoP Nanoparticles as Efficient Electrocatalyst for Oxygen Evolution Reaction in an Alkaline Solution

摘要

Water splitting can acquire clean energy. To enhance the water splitting ability, electrocatalysts qualifyhigh catalytic ability and low cost are need to be explored. Herein, a bimetal phosphide (NiCoP)nanomaterial is reported as an efficient electrocatalyst for water oxidation. The ternary nickel cobaltphosphide nanoparticles were synthesized from the solution-phase reaction of organic Co and Niprecursors with trioctylphosphine. The nanoparticle size is 18 5 nm. After annealing, the catalyticability of NiCoP is significantly enhanced. The overpotential decreased from 480 to 330 mV vs RHE-2 -3 at 10 mA cm in 1 mol dm KOH alkaline solution. When hydrophilic carbon nanotubes (CNTs)mixed with the NiCoP to form hybrid NiCoP-CNTs, the overpential further decreased from 330 to 320-2 mV vs RHE at 10 mA cm . The Tafel slopes of ca. 69 and 52 mV are found for annealed NiCoP andNiCoP-CNTs, respectively. The stability test of NiCoP-CNTs also shown the remarkable catalyticactivity for long-term operation.