Co-Prussian blue analogue supported on graphene-based materials as an electrocatalyst for OER at neutral pH

Author(s)

Yoshimura, Rafael G. ; de B. Ferraz, Thiago V. ; Zambiazi, Priscilla J. ; Bonacin, Juliano A.

• Document type: Journal article
• Source: ENERGY ADVANCES; v. 3, n. 2, p. 9-pg., 2023-12-26.

Abstract

The development of efficient, robust, and low-cost electrocatalysts for the oxygen evolution reaction (OER) under mild conditions is a sustainable pathway for energy conversion and storage technologies. Cobalt Prussian blue analogue (Co-PBA) has been emerging as a potential candidate to be engineered and match such requirements. In this study, the catalytic activity performance of Co-PBA was improved by depositing over different types of graphene-based materials that act as supports, resulting in hybrid composites. The Co-PBA + r_GO N2, which is Co-PBA deposited over a reduced graphene oxide doped with N atoms (urea as N source), showed the best OER catalytic improvements in a neutral medium (0.5 mol L-1 KNO3), reducing the overpotential in 54 mV and 137 mV to reach current densities of 10 (J10) and 50 (J50) mA cm-2, respectively, in comparison to the sole electrocatalyst Co-PBA. These results indicate that the interaction between the Co-PBA and graphene-based supports plays a pivotal role in effectively enhancing the OER activity of the electrocatalyst. Graphene-based materials doped with N can act as supports to boost the electrocatalytic activity of Co-Prussian Blue in the oxygen evolution reaction (OER) under mild conditions. (AU)

• FAPESP's process: 17/11986-5 - Generation and storage of New Energy: bringing technological development for the country
• Grantee: Ana Flávia Nogueira
• Support Opportunities: Research Grants - Research Centers in Engineering Program
• FAPESP's process: 21/05976-2 - Strategies for improving the performance of Prussian blue-based catalysts in water oxidation reactions under mild conditions
• Grantee: Juliano Alves Bonacin
• Support Opportunities: Regular Research Grants