Using black carbon modified with NbMo and NbPd oxide nanoparticles for the improvement of H2O2 electrosynthesis

Author(s)

Trevelin, L. C. ^[1] ; Valim, R. B. ^{[1, 2]} ; Carneiro, J. F. ^[1] ; De Siervo, A. ^[2] ; Rocha, R. S. ^[3] ; Lanza, V, M. R.

Affiliation

^[1] V, Univ Sao Paulo, Sao Carlos Inst Chem, Ave Trabalhador Sao Carlense 400, BR-13566590 Sao Carlos, SP - Brazil

^[2] Univ Estadual Campinas, Gleb Wataghin Inst Phys, Rua Sergio Buarque de Holanda 777, BR-13083859 Campinas, SP - Brazil

^[3] Univ Sao Paulo, Lorena Sch Engn, Estr Campinho Sn, BR-12602810 Lorena, SP - Brazil

• Document type: Journal article
• Source: JOURNAL OF ELECTROANALYTICAL CHEMISTRY; v. 877, NOV 15 2020.
• Web of Science Citations: 0

Abstract

Oxygen reduction reaction (ORR) is an important reaction with applications in advanced oxidative processes through in aim hydrogen peroxide electrogeneration. Oxygen can be reduced either to hydrogen peroxide via two-electron pathway or in a competitive way to water via four-electron pathway. This study shows the application of Printex L6 carbon modified with niobium/molybdenum or niobium/palladium oxides for H2O2 generation in K2SO4 0.1 mol L-1 (pH 2), where the modified carbon contributed to an increase in electroconductivity compared to unmodified carbon. The catalysts were prepared by the polymeric precursor method and were analyzed by x-ray absorption near edge structure (XANES), x-ray diffraction (XRD), and xray photoelectron spectroscopy (XPS) which showed the presence of orthorhombic Nb2O5 and MoO3 and tetragonal PdO independent phases. Also, the data obtained from x-ray fluorescence (FRX) and transmission electron microscopy (TEM) showed particle size of about 5 nm for the modified Printex L6 carbon compared to 25-30 nm for the unmodified Printex L6 carbon in an almost homogeneous distribution on the carbon surface. Based on the electrochemical analyses, the values obtained for H2O2 selectivity were 77, 77 and 88% for 5% Nb50Mo50/C, 5%Nb90Pd10/C, and 5% Nb95Pd05/C, respectively, compared to 89% for unmodified Printex L6 carbon. The materials investigated presented potential shifts of 110, 420 and 340 mV for 5% Nb50Mo50/C, 5% Nb-90 Pd-10/C and 5% Nb95Pd05 /C, respectively, compared to Printex L6 carbon at a determined current density. (AU)

• FAPESP's process: 17/10118-0 - Study and application of electrochemical technology for the analysis and degradation of endocrine interferents: materials, sensors, processes and scientific dissemination
• Grantee: Marcos Roberto de Vasconcelos Lanza
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 14/50945-4 - INCT 2014: National Institute for Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactivies
• Grantee: Maria Valnice Boldrin
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 07/08244-5 - Study of the magnetic properties of Pd and PdAu ultrathin films and nanoparticles by using XMCD
• Grantee: Abner de Siervo
• Support Opportunities: Regular Research Grants
• FAPESP's process: 07/54829-5 - Electronic and geometric structure of nano-materials: synchrotron radiation studies
• Grantee: Richard Landers
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 13/02762-5 - Development of technologies to prevent pollution: degradation and monitoring online of antibiotics in sewage
• Grantee: Robson da Silva Rocha
• Support Opportunities: Research Grants - Young Investigators Grants
• FAPESP's process: 16/12597-0 - Gas difusion electrodes production modified with bimetallic oxides of Nb, Mo, Pd e Zr for the production of H2O2 in situ
• Grantee: Leandro Cesar Trevelin
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 14/11486-4 - Production and evaluation of nanostructured binary metal oxides for the electrosynthesis of Hydrogen Peroxide (H2O2)
• Grantee: Leandro Cesar Trevelin
• Support Opportunities: Scholarships in Brazil - Master