Scholarlink

<p>Piezochromic molybdates (XMoO<sub>4</sub>, X = Ni, Co, Cu) can reversibly modulate their color via pressure- or temperature-induced polymorphic phase transitions. Beyond chromic behavior, the structural flexibility of the molybdate sublattice, switching between [MoO<sub>4</sub>] tetrahedral and [MoO<sub>6</sub>] octahedral coordination, implies tunable charge-transfer characteristics that are highly relevant to electrochemical applications, particularly when these compounds are regarded as metastable materials with intrinsically active frameworks. Herein, we demonstrate that microscale XMoO<sub>4</sub> powders exhibit distinct oxygen evolution reaction (OER) activities governed by structural instability and electronic structure. Single-phase XMoO<sub>4</sub> micropowders show composition-dependent OER performance (151&#xa0;mA cm<sup>-2</sup> for NiMoO<sub>4</sub>, 218&#xa0;mA cm<sup>-2</sup> for CoMoO<sub>4</sub>, and 206&#xa0;mA cm<sup>-2</sup> for CuMoO<sub>4</sub> in 1&#xa0;M KOH). Moreover, the electrochemical oxidation behavior of XMoO<sub>4</sub> during water electrolysis varies markedly with the structural phase described (α and β), particularly near an applied potential of ~ 1&#xa0;V. These results highlight the catalytic potential of metastable ternary metal oxide powders without relying on noble or rare-earth elements and suggest that metastability can serve as an effective design parameter for advanced electrocatalysts.</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

Metastable Phase in Molybdate XMoO4 (X = Ni, Co, Cu) for Oxygen Evolution Reaction: Structural Phase Dependence

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年3月12日

查看全文
  • Si Hoon Jeong,
  • Seung Yong Lee,
  • Nosang Vincent Myung,
  • Kyu Hyoung Lee

摘要

Piezochromic molybdates (XMoO4, X = Ni, Co, Cu) can reversibly modulate their color via pressure- or temperature-induced polymorphic phase transitions. Beyond chromic behavior, the structural flexibility of the molybdate sublattice, switching between [MoO4] tetrahedral and [MoO6] octahedral coordination, implies tunable charge-transfer characteristics that are highly relevant to electrochemical applications, particularly when these compounds are regarded as metastable materials with intrinsically active frameworks. Herein, we demonstrate that microscale XMoO4 powders exhibit distinct oxygen evolution reaction (OER) activities governed by structural instability and electronic structure. Single-phase XMoO4 micropowders show composition-dependent OER performance (151 mA cm-2 for NiMoO4, 218 mA cm-2 for CoMoO4, and 206 mA cm-2 for CuMoO4 in 1 M KOH). Moreover, the electrochemical oxidation behavior of XMoO4 during water electrolysis varies markedly with the structural phase described (α and β), particularly near an applied potential of ~ 1 V. These results highlight the catalytic potential of metastable ternary metal oxide powders without relying on noble or rare-earth elements and suggest that metastability can serve as an effective design parameter for advanced electrocatalysts.

Graphical Abstract