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<p>In this research, a metal-glycerate framework strategy was utilized to fabricate homogeneous, phase-pure Mn-incorporated Co<sub>3</sub>O<sub>4</sub> ((x = 0.5, 1.0, and 1.5)Mn<sub>x</sub>Co<sub>3−x</sub>O<sub>4</sub>) yolk-shell hollow microspheres, exhibiting excellent hydrogen sensing capabilities. XPS results indicated that Mn integration modified the electronic characteristics, particularly enhancing the Co(III)/Co(II) proportion. XRD studies further validated that Mn incorporation induced structural strain and crystallographic defects. Additionally, Mn-incorporation prompted morphological evolution from solid Co<sub>3</sub>O<sub>4</sub> spheres into porous yolk-shell architectures, resulting in a significant rise in surface area and hierarchical pore distribution. Among the samples, the optimal (x = 0.5)Mn<sub>x</sub>Co<sub>3−x</sub>O<sub>4</sub>-based sensor showed a superior H<sub>2</sub> response at operational temperature of 250&#xa0;°C, with a response value 5.5 and 6.0 times higher than that of bare Co<sub>3</sub>O<sub>4</sub> at 100 and 1000 ppm H<sub>2</sub>, respectively. The sensor’s fast response/recovery characteristics and ultra-wide detection capability from 1000 ppm down to 1 ppm reflect its exceptional sensitivity and broad detection range. Moreover, it displayed high selectivity, excellent functionality in humid environments, and long-term durability for up to 50 days. Altogether, these outcomes confirmed the promise of Mn-modified Co<sub>3</sub>O<sub>4</sub> yolk-shell structures for next-generation hydrogen sensing platforms.</p> Graphical Abstract <p> Mn-incorporated Co<sub>3</sub>O<sub>4</sub> yolk-shell microspheres, synthesized via a metal-glycerate route, exhibit enhanced surface area, lattice defects, and optimized Co(III)/Co(II) ratio, enabling ultra-sensitive, selective, and durable hydrogen sensing with rapid response/recovery and detection from 1000 ppm down to 1 ppm.</p>

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Hierarchal Mn-Integrated Co3O4 Yolk-Shell Hollow Sphere for Efficient Hydrogen Detection System

  • 期刊论文

  • 发表日期：

    2026年3月28日

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  • Xin Liang

摘要

In this research, a metal-glycerate framework strategy was utilized to fabricate homogeneous, phase-pure Mn-incorporated Co3O4 ((x = 0.5, 1.0, and 1.5)MnxCo3−xO4) yolk-shell hollow microspheres, exhibiting excellent hydrogen sensing capabilities. XPS results indicated that Mn integration modified the electronic characteristics, particularly enhancing the Co(III)/Co(II) proportion. XRD studies further validated that Mn incorporation induced structural strain and crystallographic defects. Additionally, Mn-incorporation prompted morphological evolution from solid Co3O4 spheres into porous yolk-shell architectures, resulting in a significant rise in surface area and hierarchical pore distribution. Among the samples, the optimal (x = 0.5)MnxCo3−xO4-based sensor showed a superior H2 response at operational temperature of 250 °C, with a response value 5.5 and 6.0 times higher than that of bare Co3O4 at 100 and 1000 ppm H2, respectively. The sensor’s fast response/recovery characteristics and ultra-wide detection capability from 1000 ppm down to 1 ppm reflect its exceptional sensitivity and broad detection range. Moreover, it displayed high selectivity, excellent functionality in humid environments, and long-term durability for up to 50 days. Altogether, these outcomes confirmed the promise of Mn-modified Co3O4 yolk-shell structures for next-generation hydrogen sensing platforms.

Graphical Abstract

Mn-incorporated Co3O4 yolk-shell microspheres, synthesized via a metal-glycerate route, exhibit enhanced surface area, lattice defects, and optimized Co(III)/Co(II) ratio, enabling ultra-sensitive, selective, and durable hydrogen sensing with rapid response/recovery and detection from 1000 ppm down to 1 ppm.