High Catalytic Activity of Co x Pt 100-x Alloys for Phenolic Compound Reduction

• Published in: Nanomaterials (Basel, Switzerland) Switzerland), 2024-03, Vol.14 (7)
• Main Authors: Dragos-Pinzaru, Oana-Georgiana, Buema, Gabriela, Racila, Luiza, Ababei, Gabriel, Borza, Firuta, Stoian, George, Tabakovic, Ibro, Lupu, Nicoleta
• Format: Article
• Language: English
• ISSN: 2079-4991; 2079-4991

In this study, we report the influence of the Pt concentration in Co Pt alloys on the catalytic activity of the alloys for 4-nitrophenol (4-NP) reduction. More precisely, a series of Co Pt alloys with a Pt concentration ranging between 60% and 95% were prepared using electrodeposition at controlled potentials from stable hexachloroplatinate aqueous solution. The Pt concentration was tuned by varying the electrodeposition potential from -0.6 to -0.9 V. The changes in the Co Pt alloy microstructure and crystalline structure have been investigated using SEM and TEM analysis. Our results show that the microstructure and the crystalline structure of the as-prepared materials do not depend on the electrodeposition potential. However, the catalytic activity of Co Pt alloys is closely correlated with the potential applied during electrochemical synthesis, hence the Pt content. We demonstrated that the synthesized materials present a high catalytic activity (approx. 90%) after six cycles of reusability despite the fact that the Pt content of the as-prepared alloys decreases. The easy preparation method that guarantees more than 97% catalytic activity of the Co Pt alloys, the easy recovery from solution, and the possibility of reusing the Co Pt alloys are the benefits of the present study.