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Abstract <p>Gallium and cryptomelane are both semiconducting materials with tunable properties. However, gallium-doped cryptomelane-type materials are still scarce in the literature. In this article, we report the studies on the powders and macro-size 3D foams (i.e., fabricated by nanowires/nanorods with a diameter of ca. 45–55 nm) of gallium-doped cryptomelane-type octahedral manganese oxide molecular sieves (Ga-K-OMS-2), through systematic determinations of ICP-OES, XRD, FT-IR, nitrogen physisorption, optical morphology, FESEM, EDS, electrical resistivity/conductivity as well as electrochemical capacitance characteristics.</p> Highlights <p>Macro-size 3D Ga-K-OMS-2 manganese oxide foams are prepared.</p> <p>XRD, ICP, IR, and EDS results verify successful gallium substitution in cryptomelane.</p> <p>Gallium substitution into cryptomelane structure may form blue shifts of IR bands.</p> <p>Gallium substitution can alter electrical &amp; electrochemical capacitance properties.</p> Graphical abstract <p></p>

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Preparation, characterization and properties of gallium-substituted manganese oxide molecular sieve powders and foams

  • 期刊论文

  • 发表日期：

    2026年3月20日

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  • Zhenxin Liu,
  • Niu Niu,
  • Hongmei Tian,
  • Depeng Wu,
  • Mengyong Gu,
  • Yu Xing

摘要

Abstract

Gallium and cryptomelane are both semiconducting materials with tunable properties. However, gallium-doped cryptomelane-type materials are still scarce in the literature. In this article, we report the studies on the powders and macro-size 3D foams (i.e., fabricated by nanowires/nanorods with a diameter of ca. 45–55 nm) of gallium-doped cryptomelane-type octahedral manganese oxide molecular sieves (Ga-K-OMS-2), through systematic determinations of ICP-OES, XRD, FT-IR, nitrogen physisorption, optical morphology, FESEM, EDS, electrical resistivity/conductivity as well as electrochemical capacitance characteristics.

Highlights

Macro-size 3D Ga-K-OMS-2 manganese oxide foams are prepared.

XRD, ICP, IR, and EDS results verify successful gallium substitution in cryptomelane.

Gallium substitution into cryptomelane structure may form blue shifts of IR bands.

Gallium substitution can alter electrical & electrochemical capacitance properties.

Graphical abstract