Abstract: In this work, the photoelectrochemical properties of g-C3N4 modified with Pt, Ir and Ir/Pt bimetallic co-catalysts were studied. All prepared photoelectrodes were tested in a two-electrode cell by cyclic voltammetry, impedance spectroscopy, and the Mott-Schottky method. First, the optimal electrolyte (triethanolamine, NaCl, NaOH, Na2SO4) was selected. The highest photocurrents were recorded in 0.5 M Na2SO4. This electrolyte was used for the subsequent tests. Second, the photoelectrodes loaded with the noble metals are studied. It was shown that in case of monometallic co-catalysts, the deposition of noble metal is accompanied by the decrease of the short-circuit current density and the growth of open-circuit voltage. The simultaneous presence of bimetallic co-catalysts can significantly affect the semiconductor electron structure and photogalvanic properties. Some correlations between the short-circuit current density and the oxidation state of the noble metals were found. A linear correlation between Pt0/Pt0+Pt2+ and Jsc was observed. It was also shown that the presence of iridium in Ir3+ form favors the photocurrent generation. The highest values of the photocurrent were obtained for g-C3N4 and were equal to 0.57 mA/cm2.

Cite: Markovskaya D.V. , Lomakina V.A. , Kozlova E.A.
Photoelectrochemical Properties of Pt- and Ir-Modified Graphitic Carbon Nitride
Chimica Techno Acta. 2024. V.11. N2. 202411208 :1-10. DOI: 10.15826/chimtech.2024.11.2.08 Scopus РИНЦ AN OpenAlex

Dates:

Submitted:	Apr 8, 2024
Accepted:	Apr 27, 2024
Published online:	May 7, 2024

Identifiers:

Scopus:	2-s2.0-85196305930
Elibrary:	68555469
Chemical Abstracts:	2025:234095
OpenAlex:	W4396900662

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