Carbon-incorporated NiP-FeP hollow nanorods as superior electrocatalysts for the oxygen evolution reaction

• Published in: Nanoscale Vol. 14; no. 43; pp. 16262 - 16269
• Main Authors: Ramesh, Siva Kumar, Son, Jihye, Ganesan, Vinoth, Kim, Jinkwon
• Format: Journal Article
• Published: 10.11.2022
• ISSN: 2040-3364; 2040-3372
• DOI: 10.1039/d2nr02663e

A rational design and cost-effective transition metal-based hollow nanostructures are important for sustainable energy materials with high efficiency. This study reports on carbon-incorporated Ni 2 P-Fe 2 P hollow nanorods ((Ni,Fe) 2 P/C HNRs) derived from a self-template approach as efficient electrocatalysts. Initially, a Ni 2 (BDC) 2 (DABCO)-MOF (Ni-MOF) is converted to NiFe-PBA hollow nanorods (HNRs) through facile ion exchange which was further converted to (Ni,Fe) 2 P/C HNRs via a subsequent phosphidation process. The resulting (Ni,Fe) 2 P/C HNRs exhibit remarkable activity for the oxygen evolution reaction in an alkaline solution requiring a small overpotential of 258 mV to drive a current density of 10 mA cm −2 and long-term stability with little deactivation after 40 h. (Ni,Fe) 2 P/C HNRs outperform (Ni,Fe) 2 P/C NPs and commercial RuO 2 . The unique hollow morphology and interfacial electronic structure substantially increase the active site and charge transfer rate of our electrocatalyst, resulting in excellent OER activity and stability. A heterostructured metal phosphide with a unique hollow morphology exhibits outstanding activity and stability for the oxygen evolution reaction.