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Selective Electrocatalytic H 2 O 2 Generation by Cobalt@N‐Doped Graphitic Carbon Core–Shell Nanohybrids
Author(s) -
Lenarda Anna,
Bevilacqua Manuela,
Tavagnacco Claudio,
Nasi Lucia,
Criado Alejandro,
Vizza Francesco,
Melchionna Michele,
Prato Maurizio,
Fornasiero Paolo
Publication year - 2019
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201900238
Subject(s) - cobalt , faraday efficiency , carbon fibers , electrolysis , materials science , reversible hydrogen electrode , electrocatalyst , oxygen evolution , doping , inorganic chemistry , metal , chemical engineering , hydrogen , hydrogen production , electrode , electrochemistry , chemistry , working electrode , organic chemistry , metallurgy , composite number , electrolyte , composite material , optoelectronics , engineering
Electrocatalytic oxygen reduction (ORR) is an emerging synthetic strategy to prepare H 2 O 2 in a sustainable fashion. N‐doped graphitic carbon with embedded cobalt nanoparticles was selected as an advanced material able to selectively trigger the ORR to form H 2 O 2 with a faradaic efficiency of almost 100 % at very positive applied potentials. The production of H 2 O 2 proceeded with high rates as calculated by bulk electrolysis (49 mmol g −1 h −1 ) and excellent current densities (≈−0.8 mA cm −2 at 0.5 V vs. reversible hydrogen electrode). The totally selective behavior depended on the combination of concomitant material features, such as the textural properties, the nature of the metal, the distribution of N moieties, the acidic environment, and the applied potential.