Open AccessDesign of hierarchical, three‐dimensional free‐standing single‐atom electrode for H 2 O 2 production in acidic media
Author(s) -
Zhang Jincheng,
Yang Hongbin,
Gao Jiajian,
Xi Shibo,
Cai Weizheng,
Zhang Junming,
Cui Ping,
Liu Bin
Publication year - 2020
Publication title -
carbon energy
Language(s) - English
Resource type - Journals
ISSN - 2637-9368
DOI - 10.1002/cey2.33
Subject(s) - electrochemistry , electrode , hydrogen peroxide , chemistry , reversible hydrogen electrode , atom (system on chip) , selectivity , hydrogen , hydrogen atom , inorganic chemistry , analytical chemistry (journal) , working electrode , catalysis , organic chemistry , alkyl , computer science , embedded system
Abstract Electrochemical reduction of molecular O 2 to hydrogen peroxide (H 2 O 2 ) offers a promising solution for water purification and environmental remediation. Here, we design a hierarchical free‐standing single‐Co‐atom (with Co–N 4 coordination) electrode for oxygen reduction reaction (ORR) via a two‐electron pathway to make H 2 O 2 in acidic media. The current density of the single‐Co‐atom electrode reached 51 mA/cm 2 at 0.1 V vs reversible hydrogen electrode, lasting for more than 10 hours of continuous operation with H 2 O 2 selectivity greater than 80%. Toward practical application, the single‐Co‐atom electrode was directly used to assemble an electrochemical cell to produce H 2 O 2 at a rate of 676 mol/kg cat /h with a cell voltage of about 1.6 V.