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Peer-reviewedCC BY 4.0Molecules

Ag2O Loading-Dependent Interfacial Properties of Ag2O/Co3O4 Composites for Gas-Phase and Electrochemical Sensing

  • Madiha Khan1,2
  • Khouloud Abid1,3
  • Viviana Bressi4
  • Ahtisham Anjum5,6
  • Claudia Espro1
  • Giovanni Neri1
6 affiliations
  1. 1Department of Engineering, University of Messina, Contrada Di Dio, 1, 98166 Messina, Italy
  2. 2Department of Physics, Air University, Pakistan Air Force (PAF Complex), E-9, Islamabad 44000, Pakistan
  3. 3Institute of Advanced Technologies for Energy “Nicola Giordano”, 98126 Messina, Italy
  4. 4Research Department, Universidad Technologica ECOTEC, Km. 13.5 Samborondón, Samborondón EC092302, Ecuador
  5. 5Physics Department, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia
  6. 6Interdisciplinary Research Center for Hydrogen Technologies and Carbon Management (IRC-HTCM), King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia
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Abstract

Ag2O-loaded Co3O4 composites (Ag2O/Co3O4) were prepared by the sol–gel auto-combustion method. Their morphology, microstructure, and textural properties were characterized by scanning electron microscopy (SEM) coupled with energy-dispersive X-ray spectroscopy (EDX), Fourier transform infrared spectroscopy (FTIR), and Brunauer–Emmett–Teller (BET) analysis. The composites were evaluated as conductometric sensors for hydrogen (H2). The Ag2O/Co3O4−0.5 sensor showed an enhanced response to H2 over the investigated concentration range of 2000–10,000 ppm at an optimal operating temperature of 125 °C compared with pure Co3O4. The electrocatalytic activity of the composites was also investigated after spray-coating them onto screen-printed carbon electrodes (SPCEs). Cyclic voltammetry (CV) showed an enhanced response to uric acid for the Ag2O/Co3O4−1.0/SPCE compared with Co3O4/SPCE, with a sensitivity of 2.6 μA μM−1 cm−2, satisfactory reproducibility and stability, and a limit of detection (LoD) of 147 nM. These findings suggest that Ag2O/Co3O4 composites are promising materials for both gas and electrochemical sensing.

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Cite

BibTeXRIS
BibTeX
@article{khan2026ag2o,
  title = {{Ag2O Loading-Dependent Interfacial Properties of Ag2O/Co3O4 Composites for Gas-Phase and Electrochemical Sensing}},
  author = {Madiha Khan and Khouloud Abid and Viviana Bressi and Ahtisham Anjum and Claudia Espro and Giovanni Neri},
  journal = {Molecules},
  year = {2026},
  month = oct,
  doi = {10.3390/molecules31203592},
  url = {https://www.mdpi.com/1420-3049/31/20/3592},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Ag2O Loading-Dependent Interfacial Properties of Ag2O/Co3O4 Composites for Gas-Phase and Electrochemical Sensing
AU  - Madiha Khan
AU  - Khouloud Abid
AU  - Viviana Bressi
AU  - Ahtisham Anjum
AU  - Claudia Espro
AU  - Giovanni Neri
PY  - 2026
DA  - 2026/10/01
JO  - Molecules
DO  - 10.3390/molecules31203592
UR  - https://www.mdpi.com/1420-3049/31/20/3592
AB  - Ag2O-loaded Co3O4 composites (Ag2O/Co3O4) were prepared by the sol–gel auto-combustion method. Their morphology, microstructure, and textural properties were characterized by scanning electron microscopy (SEM) coupled with energy-dispersive X-ray spectroscopy (EDX), Fourier transform infrared spectroscopy (FTIR), and Brunauer–Emmett–Teller (BET) analysis. The composites were evaluated as conductometric sensors for hydrogen (H2). The Ag2O/Co3O4−0.5 sensor showed an enhanced response to H2 over the investigated concentration range of 2000–10,000 ppm at an optimal operating temperature of 125 °C compared with pure Co3O4. The electrocatalytic activity of the composites was also investigated after spray-coating them onto screen-printed carbon electrodes (SPCEs). Cyclic voltammetry (CV) showed an enhanced response to uric acid for the Ag2O/Co3O4−1.0/SPCE compared with Co3O4/SPCE, with a sensitivity of 2.6 μA μM−1 cm−2, satisfactory reproducibility and stability, and a limit of detection (LoD) of 147 nM. These findings suggest that Ag2O/Co3O4 composites are promising materials for both gas and electrochemical sensing.
SN  - 1420-3049
ER  -