FeNi3 Modified Fe2O3/NiO/MoO2 Heterogeneous Nanoparticles Immobilized N, P co-doped CNT as Efficient and Stable Electrocatalyst for Water Oxidation
As a rate-determining step, electrocatalytic water oxidation acts a pivotal role in water splitting process. As a consequence, it is of great significance to explore low-cost, efficient and durable electrocatalysts for oxygen evolution reaction (OER) to promote electrocatalytic splitting water. Herein, for the first time, FeNi3 modified Fe2O3/NiO/MoO2 heterogeneous nanoparticles immobilized N, P co-doped CNT matrix materials (FNM/NPCNT) are synthesized by a facile solid-phase grinding the precursor composed of nickel hexacyanoferrate/phosphomolybdic acid/CNT and subsequently pyrolyzing under the nitrogen atmospheres without any further post-processing. Due to its significant promotion of the charge transfer efficiency and preventing the metallic based catalysts from being corroded, as-prepared FNM/NPCNT hybrid electrocatalyst shows a high OER activity with a low overpotential of 282 mV vs. RHE at 10 mA cm-2 and a small Tafel slope of 46.2 mV dec-1 in alkaline electrolyte. Moreover, the as-prepared FNM/NPCNT hybrid delivers a greatly large mass activity of 327.6 A g-1 at the potential of 1.7 V and excellent stability (more than 20 h). This study opens up a new approach to design and synthesize nonprecious transition metal based composite immobilized N, P co-doped CNT materials as OER catalysts with high efficiency and long-term stability for promoting water splitting.