Differentiation between Carbon Corrosion and Oxygen Evolution Catalyzed by NixB/C Hybrid Electrocatalysts in Alkaline Solution using Differential Electrochemical Mass Spectrometry. Issue 12 (29th June 2020)

• Record Type: Journal Article
• Authors: Möller, Sandra; Barwe, Stefan; Dieckhöfer, Stefan; Masa, Justus; Andronescu, Corina; Schuhmann, Wolfgang
• Is Part Of: ChemElectroChem. Volume 7:Issue 12(2020)
• Page Start: 2680
• Page End: 2686
• Publication Date: 2020-06-29
• Subjects: differential electrochemical mass spectrometry -- DEMS -- hybrid electrocatalysts -- carbon corrosion -- oxygen evolution reaction; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.202000697
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: Carbon is a frequently used electrode material and an important additive in catalyst films. Its corrosion is often reported during electrocatalysis at high anodic potentials, especially in acidic electrolyte. Investigation of the carbon corrosion in alkaline environment is difficult due to the CO2 /CO3 2− equilibrium. We report the on‐line determination of electrolysis products generated on Ni x B/C hybrid electrocatalysts in alkaline electrolyte at anodic potentials using differential electrochemical mass spectrometry (DEMS). Ni x B/C catalyst films were obtained from mixtures containing different ratios of Ni X B and benzoxazine monomers followed by polymerization and pyrolysis. The impact of the composition of the electrocatalyst on the dominant electrolysis process allows to distinguish between the oxygen evolution reaction and carbon corrosion using DEMS results as well as the catalyst surface composition evaluated from X‐ray photoelectron spectra. At the imposed highly oxidative conditions, an increasing amount of Ni x B in the electrocatalyst leads to a suppression of carbon corrosion. Abstract : Resolving the issue : On‐line determination of electrolysis products generated on Ni x B/C hybrid electrocatalysts in alkaline electrolyte at anodic potentials using differential electrochemical mass spectrometry allows the oxygen evolution reaction and carbon corrosion to be distinguished. At highly oxidative conditions, an increasing amount of Ni x B in the electrocatalyst leads to suppression of carbon corrosion.