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<p>Phase-pure hexagonal CuCrO<sub>2</sub> was synthesized using precipitation method under an argon atmosphere. L-( +)-Ascorbic acid was employed as a reducing agent for the reduction of Cu(OH)₂ for the synthesis of CuCrO<sub>2</sub>. Thermal analysis (TG/DTA) and X-ray diffraction (XRD) revealed the formation of CuO and CuCr<sub>2</sub>O<sub>4</sub> as impurity phases in the temperature range of 573–873&#xa0;K when synthesis was conducted in air. In contrast, the use of an inert argon atmosphere effectively suppressed these impurities, enabling the formation of single-phase CuCrO<sub>2</sub>. Powder exhibits a higher surface area (45.5 m<sup>2</sup>g<sup>−1</sup>) and a broader mesoporous network compared to the pellet, which shows reduced porosity and a lower surface area (30.7 m<sup>2</sup>g<sup>−1</sup>) due to densification during compaction. The BET results confirm type-IV isotherms with H3 hysteresis, highlighting the superior pore accessibility of the powder. Thermal studies indicate CuCrO<sub>2</sub> remains stable in air up to 453&#xa0;K and sensing studies shows a selective response towards hydrogen between 200 and 7000 parts per million (ppm) at 453&#xa0;K. The CuCrO<sub>2</sub> sensor calibration follows a power law model with excellent linearity (R<sup>2</sup> = 0.97), and no cross-sensitivity was observed towards NH<sub>3</sub>, NO<sub>2</sub>, H<sub>2</sub>S, butane, or CH₄. Based on the 3σ noise criterion, the limit of detection for hydrogen at 453&#xa0;K is approximately 205&#xa0;ppm.</p>

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Thermal analysis—an important tool for preparation and qualification of CuCrO2 towards hydrogen sensing applications

  • 期刊论文

  • 发表日期：

    2026年2月1日

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  • Aleena Xavier,
  • E. Prabhu,
  • S. Murugesan,
  • Dipankar Kundu,
  • Sajal Ghosh,
  • P. C. Clinsha,
  • S. Muthuraja,
  • V. Jayaraman

摘要

Phase-pure hexagonal CuCrO2 was synthesized using precipitation method under an argon atmosphere. L-( +)-Ascorbic acid was employed as a reducing agent for the reduction of Cu(OH)₂ for the synthesis of CuCrO2. Thermal analysis (TG/DTA) and X-ray diffraction (XRD) revealed the formation of CuO and CuCr2O4 as impurity phases in the temperature range of 573–873 K when synthesis was conducted in air. In contrast, the use of an inert argon atmosphere effectively suppressed these impurities, enabling the formation of single-phase CuCrO2. Powder exhibits a higher surface area (45.5 m2g−1) and a broader mesoporous network compared to the pellet, which shows reduced porosity and a lower surface area (30.7 m2g−1) due to densification during compaction. The BET results confirm type-IV isotherms with H3 hysteresis, highlighting the superior pore accessibility of the powder. Thermal studies indicate CuCrO2 remains stable in air up to 453 K and sensing studies shows a selective response towards hydrogen between 200 and 7000 parts per million (ppm) at 453 K. The CuCrO2 sensor calibration follows a power law model with excellent linearity (R2 = 0.97), and no cross-sensitivity was observed towards NH3, NO2, H2S, butane, or CH₄. Based on the 3σ noise criterion, the limit of detection for hydrogen at 453 K is approximately 205 ppm.