# Preparation of Fe-Doped Ba0.7Pr0.3CoO3−δ Perovskite Oxide for Electrocatalytic Hydrogen Evolution

## TL;DR

This paper presents a Fe-doped perovskite oxide that improves hydrogen production efficiency through enhanced electrocatalytic performance.

## Contribution

The study introduces Fe doping in Ba0.7Pr0.3CoO3−δ to optimize electronic structure and catalytic activity for hydrogen evolution.

## Key findings

- Fe doping increases high-valent Co species and lattice oxygen content, reducing charge transfer resistance.
- BPCF0.2 achieves 172 mV overpotential at 10 mA cm−2 in 1.0 M KOH with stable performance over 200 hours.

## Abstract

Developing efficient and stable electrocatalysts for the hydrogen evolution reaction (HER) is critical for advancing clean and sustainable energy technologies. Herein, a Fe-doped perovskite oxide Ba0.7Pr0.3Co0.8Fe0.2O3−δ (BPCF0.2) was successfully synthesized via the sol–gel method. By regulating the stoichiometric ratio of precursors and calcination temperature, a stable single-phase perovskite structure was achieved. X-ray photoelectron spectroscopy (XPS) analysis indicated that Fe incorporation increased the proportion of high-valent Co species and lattice oxygen content, which respectively reduced the charge transfer resistance of BPCF0.2, thereby significantly enhancing catalytic performance. Electrochemical measurements revealed that BPCF0.2 exhibited remarkable HER activity in 1.0 M KOH, achieving an overpotential of 172 mV at a current density of 10 mA cm−2, with no significant decay during 200 h of continuous HER testing at 100 mA cm−2. These results demonstrate that the Fe doping strategy can effectively optimize the electronic structure, providing valuable insights for the development of perovskite-based HER catalysts.