Selective CO Evolution from CO₂ over Ag-Ni-Based Cocatalyst-Modified Perovskite under Simulated Solar Light

Aibol Baratov; Chingis Daulbayev; Zhengisbek Kuspanov

doi:10.18321/ectj1675

Authors

Aibol Baratov Satbayev University, 22 Satbayev str., 050013, Almaty, Kazakhstan; Institute of Nuclear Physics, 1 Ibragimov str., 050032 Almaty, Kazakhstan
Chingis Daulbayev Institute of Nuclear Physics, 1 Ibragimov str., 050032 Almaty, Kazakhstan
Zhengisbek Kuspanov Satbayev University, 22 Satbayev str., 050013, Almaty, Kazakhstan; Institute of Nuclear Physics, 1 Ibragimov str., 050032 Almaty, Kazakhstan

DOI:

https://doi.org/10.18321/ectj1675

Keywords:

Dual cocatalyst photodeposition, Charge carrier separation, Al-STO photocatalyst, CO2 photoreduction, CO selectivity

Abstract

Photocatalytic CO₂ reduction offers a dual benefit of mitigating greenhouse gas emissions while generating renewable fuels. In this study, a composite photocatalyst based on aluminum-doped strontium titanate (Al-STO) was synthesized via a flux method and modified with dual cocatalysts: metallic Ag (reductive site) and a Ni-based species (oxidative site). Sequential photodeposition enabled precise loading, yielding a catalyst with enhanced charge separation and suppressed recombination. Structural and spectroscopic analyses confirmed the uniform dispersion of cocatalysts and broadened light absorption into the visible range. Photocatalytic evaluation under simulated solar light revealed a more than twofold increase in CO production (24.2 µmol·g⁻¹·h⁻¹) and high selectivity (up to 99%), compared to pristine Al-STO. The observed performance enhancement is attributed to the synergistic interaction between Ag and the Ni-based cocatalyst, enabling spatially resolved charge carrier pathways. These results highlight the promise of cocatalyst engineering on perovskite surfaces for selective CO₂-to-fuel conversion under solar irradiation.

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