Amorphous‐Crystalline Interfaces on Hollow Nanocubes Derived from Ir‐Doped Ni–Fe–Zn Prussian Blue Analog Enables High Capability of Alkaline/Acidic/Saline Water Oxidations

Abstract

Development of highly efficient and robust electrocatalysts for oxygen evolution reaction (OER) under specific electrolyte is a key to actualize commercial low‐temperature water electrolyzers. Herein, a rational catalyst design strategy is first reported based on amorphous–crystalline (a–c) interfacial engineering to achieve high catalytic activity and durability under diverse electrolytes that can be used for all types of low‐temperature water electrolysis. Abundant a–c interface (ACI) is implemented into a hollow nanocubic (pre)‐electrocatalyst which is derived from Ir‐doped Ni–Fe–Zn Prussian blue analogues (PBA). The implemented c–a interface is well maintained during prolonged OER in alkaline, alkalized saline, and acidic electrolytes demonstrating its diverse functionality for water electrolysis. Notably, the final catalyst exhibits superior catalytic activity with excellent durability for OER compared to that of benchmark IrO2 catalyst, regardless of chemical environment of electrolytes. Hence, this work can be an instructive guidance for developing the ACI engineered electroctalyst which can be diversely used for different types of low‐temperature electrolyzers.

Electronic redistribution through the interface of MnCo2O4–Ni3N nano-urchins prompts rapid In situ phase transformation for enhanced oxygen evolution reaction

“…1 Hence, it is vital to solve the ever-increasing petrochemical energy crises and environmental pollution concerns by creating sustainable and green energy sources. 2–5 For oxygen/hydrogen production, electrocatalytic water splitting has attracted great attention. However, the sluggishness of the reaction kinetics of the oxygen evolution reaction (OER) and its complex reaction mechanism are barriers to the water splitting reaction.…”