Green Synthesis of Self‐Supported Ni−Fe Oxyhydroxide Pagoda‐Shaped Nanocone Arrays for Electrocatalytic Oxygen Evolution Reaction

Abstract

Nowadays, stainless steel (SS) based electrode has gained extensive interest for oxygen evolution reaction (OER) owing to its low-cost and high efficiency. However, the problem of hazardous Cr dissolving out from the SS during the surface treatment needs to be solved urgently. Herein, we report a kind of self-supported NiÀ Fe oxyhydroxide pagoda-shaped nano-cone array prepared through an environmentally friendly method, which can be developed as an electrocatalyst for OER with low overpotential, small Tafel slope, and good stability under alkaline condition. This route ensures good catalytic performance of the prepared electrode and eliminates the leach of Cr ion at the same time.

Impact of iron nitride-encapsulated bimetallic nickel molybdenum nitride on water-splitting efficiency in alkaline electrolytes

“…Overall, the low R ct , the significant reduction in the phase angle in the Bode plot, and the low admittance strongly indicated that 3FeNiMoN had enhanced OER activity compared with the bare NiMoN electrode. 12,43,44,46,47,51–55…”

“…Overall, the low R ct , the signicant reduction in the phase angle in the Bode plot, and the low admittance strongly indicated that 3FeNiMoN had enhanced OER activity compared with the bare NiMoN electrode. 12,43,44,46,47,[51][52][53][54][55] In recent years, a number of monofunctional catalysts with a strong performance for the HER in an acidic medium or the OER in an alkaline medium have been reported, but bifunctionality in the same electrolyte has been rare, making it difficult to establish an effective water electrolysis system. Some catalysts have been identied as bifunctional but are unable to perform effectively in an alkaline electrolyte.…”