Water Oxidation Performance Enhanced by Electrochemically Designed Vacancies on a Prussian Blue Catalyst

Author(s)

Germscheidt, Rafael Lavagnolli ; Francischini, Danielle da Silva ; Silva, Mariana Bianchini ; Zezzi Arruda, Marco Aurelio ; Barboza Formiga, Andre Luiz ; Rizuti da Rocha, Tulio Costa ; Bonacin, Juliano Alves

• Document type: Journal article
• Source: ACS APPLIED ENERGY MATERIALS; v. 5, n. 8, p. 8-pg., 2022-08-22.

Abstract

Prussian blue analogues are one of the most promising examples of water oxidation catalysts presenting great performance, activity, and stability under mild conditions. Herein, we report an alternative methodology to synthesize the Prussian blue, obtaining a catalyst with vacancies created by an electrochemical method. This catalyst showed an outstanding activity, with an onset overpotential of 361 mV. Using pyridine as a molecular probe, we identified the presence of vacant Fe2+ sites, and the quantification of these sites allowed us to estimate a TOF number of 0.2170 s(-1) for the water oxidation reaction. These results indicate that defect engineering is a versatile strategy to boost the catalytic activity in Prussian blue analogues by increasing the number of active sites. (AU)

• FAPESP's process: 17/50085-3 - PIRE: climate research education in the Americas using tree-ring speleothem examples (PIRE-CREATE)
• Grantee: Francisco William da Cruz Junior
• Support Opportunities: Research Projects - Thematic Grants
• 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: 18/25207-0 - Nanometallomics applied to soybean cultivation for studying the effects of metal-related nanoparticles
• Grantee: Marco Aurelio Zezzi Arruda
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 14/50867-3 - INCT 2014: National Institute of Science and Technology in Bioanalysis
• Grantee: Marco Aurelio Zezzi Arruda
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 19/00063-9 - Quantitative bioimaging of Cd and Pb through laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS imaging) to tree rings and speleothems
• Grantee: Danielle da Silva Francischini
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)