| Title: |
An oxygen reduction reaction electrocatalyst tuned for hydrogen peroxide generation based on a pseudo-graphite doped with graphitic nitrogen |
| Authors: |
Hamal, Kailash; Koirala, Dipak; May, Jeremy; Dalbec, Forrest; Nicholas, Nolan; Cheng, I. Francis |
| Source: |
Journal of Electrochemical Science and Engineering ; ISSN 1847-9286 (Online) ; Volume 12 ; Issue 5 |
| Publisher Information: |
International Association of Physical Chemists |
| Publication Year: |
2022 |
| Collection: |
Hrčak - Portal of scientific journals of Croatia / Portal znanstvenih časopisa Republike Hrvatske |
| Subject Terms: |
Hydrogen peroxide; oxygen reduction reaction; electrocatalysis; N-doped carbon |
| Description: |
The carbon material, GUITAR (pseudo-graphite from the University of Idaho thermolyzed asphalt reaction) can be doped with nitrogen in two prevalent forms. In a previous study N(py)-GUITAR had a predominance of pyridinic and pyrrolic moieties with no graphitic nitrogen. In this study N(g)-GUITAR contains a 9.7 % N atomic abundance, with that fraction consisting of 72.3 % graphitic, 23.7 % pyridinic, and 0 % pyrrolic nitrogen. The two materials allow for the examination of hypotheses regarding the importance of the three different nitrogen moieties in the oxygen reduction reaction (ORR). In the previous investigation, the lack of graphitic nitrogen of N(py)-GUITAR gave a preferred pathway of 4e- ORR to H2O. In this investigation, N(g)-GUITAR gave a 2e- ORR pathway to H2O2. This was elucidated by current efficiency and hydrodynamic voltammetry studies. The high predominance of graphitic nitrogen confirms the hypothesis regarding 2e- vs. 4e- ORR pathways with N-doped carbon materials. N(g)-GUITAR was also evaluated for parasitic pathways for H2O2 production. At -0.95 V vs. Ag/AgCl the combination of current efficiency for H2O2 is 96 % in 0.05 M Na2SO4 with a production rate of 4.9 mg cm-2 h-1, is the highest reported in the literature. This indicates possibilities for water purification and treatment applications, which require 10 to 250 mg L-1, depending on conditions. |
| Document Type: |
article in journal/newspaper |
| File Description: |
application/pdf |
| Language: |
English |
| Relation: |
https://doi.org/10.5599/jese.1407; https://hrcak.srce.hr/284477 |
| DOI: |
10.5599/jese.1407 |
| Availability: |
https://doi.org/10.5599/jese.1407; https://hrcak.srce.hr/284477; https://hrcak.srce.hr/file/411714 |
| Rights: |
info:eu-repo/semantics/openAccess ; Journal of Electrochemical Science and Engineering (jESE) publishes articles under the Creative Commons Attribution License. This means that all articles published by jESE, including data, graphics tables and supplement materials, can be reused by other autors, linked on websites, crawled by search engines, or reused by blogs. , free of charge under the sole condition of proper accreditation of the source and the original Publisher. jESE believes that open access publishing can foster the exchange of research results amongst electrochemists world-wide, including from developing countries, as well as to an interested general public. We believe that open access is an enriching part of the science communication that could and should co-exist with all other forms of communication and publication. |
| Accession Number: |
edsbas.AF550CE3 |
| Database: |
BASE |