Scholarlink

<p>Significant enhancements of electrocatalytic activities for both half-reactions of water-splitting, i.e., oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), are demonstrated upon changing the structure of different hexagonal perovskite-type systems. The structural change is observed by gradually incorporating the catalytically active Fe into the B-site in the BaMn<sub>1-x</sub>Fe<sub>x</sub>O<sub>3-δ</sub> system. The structure of the BaMn<sub>1-x</sub>Fe<sub>x</sub>O<sub>3-δ</sub> system consists of 2H-hexagonal for BaMnO<sub>3-δ</sub>, 10H-hexagonal for BaMn<sub>1/2</sub>Fe<sub>1/2</sub>O<sub>3-δ</sub>, and variation of 10H-hexagonal for BaFeO<sub>3-δ</sub>. Nevertheless, the change in the structural order by incorporating Fe into the system to fully replace the B-site ion from Mn to Fe results in a significant change in charge transport properties and greater electrocatalytic activity of BaFeO<sub>3-δ</sub>, manifested in smaller overpotentials, smaller charge transfer resistance, greater electrocatalytic current density, and faster reaction kinetics. These findings indicate the important role of Fe over Mn in the earth-abundant transition metal catalysts in directing the electrochemical properties.</p> Graphical abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Fe-substituted BaMnxFe1−xO3−δ perovskites: charge transport and electrocatalytic performance

  • 期刊论文

  • 发表日期：

    2025年8月14日

查看全文
  • M.D. Ruhul Amin,
  • Md. Mosharraf Hossain Bhuiyan,
  • F. A. Sabbir Ahamed,
  • Monirul Islam Uzzal

摘要

Significant enhancements of electrocatalytic activities for both half-reactions of water-splitting, i.e., oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), are demonstrated upon changing the structure of different hexagonal perovskite-type systems. The structural change is observed by gradually incorporating the catalytically active Fe into the B-site in the BaMn1-xFexO3-δ system. The structure of the BaMn1-xFexO3-δ system consists of 2H-hexagonal for BaMnO3-δ, 10H-hexagonal for BaMn1/2Fe1/2O3-δ, and variation of 10H-hexagonal for BaFeO3-δ. Nevertheless, the change in the structural order by incorporating Fe into the system to fully replace the B-site ion from Mn to Fe results in a significant change in charge transport properties and greater electrocatalytic activity of BaFeO3-δ, manifested in smaller overpotentials, smaller charge transfer resistance, greater electrocatalytic current density, and faster reaction kinetics. These findings indicate the important role of Fe over Mn in the earth-abundant transition metal catalysts in directing the electrochemical properties.

Graphical abstract