Ambient temperature synthesis of iron-doped porous nickel pyrophosphate nanoparticle with long-term chemical stability for high-performance oxygen evolution reaction catalysis and supercapacitor

Recently, transition metal-phosphides and phosphates have been recognized as candidates for electrochemical energy storage and conversion application. However, the preparation of such materials usually requires high energy consumption and toxic precursors that drawbacks real applications. In this study, we report ambient temperature synthesis of transition metal phosphates for oxygen evolution reaction (OER) and supercapacitor. The prepared iron-doped porous nickel pyrophosphate (NFPy) nanoparticle is synthesized via simple stirring in ambient temperature using only the precursor for Ni, Fe, and pyrophosphate without any heat treatment. The usage of pyrophosphate promotes the facile Ni oxidation and high chemical stability, overall beneficial to electrochemical applications and the environment. The OER performance of NFPy shows promising results that only required the overpotential of 0.210 V to reach 10 mA·cm-2. Also, with the help of carbon nanotubes, supercapacitor using NFPy exhibits a good electroche...