ZIF-Co 3 O 4 @ZIF-Derived Urchin-Like Hierarchically Porous Carbon as Efficient Bifunctional Oxygen Electrocatalysts

Co O nanoparticles were sandwiched into interlayers between ZIF-8 and ZIF-67 to form ZIF-Co O @ZIF precursors. Pyrolysis of ZIF-Co O @ZIF yielded an urchin-like hierarchically porous carbon (Co@CNT/NC), the thorns of which were carbon nanotubes embedded Co nanoparticles. With large specific surface...

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Bibliographic Details
Published inChemistryOpen (Weinheim) p. e202400057
Main Authors Zhang, Lingling, Wang, Xia, Gong, Chong, Sun, Weiyan, Lu, Zihan
Format Journal Article
LanguageEnglish
Published Germany 10.06.2024
Subjects
electrocatalyst
ZIF
OER
ORR
Layered porous carbon
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Summary:Co O nanoparticles were sandwiched into interlayers between ZIF-8 and ZIF-67 to form ZIF-Co O @ZIF precursors. Pyrolysis of ZIF-Co O @ZIF yielded an urchin-like hierarchically porous carbon (Co@CNT/NC), the thorns of which were carbon nanotubes embedded Co nanoparticles. With large specific surface area and hierarchically porous structure, as-prepared Co@CNT/NC exhibited excellent bifunctional oxygen electrocatalytic performances. It has good ORR performance with E of 0.85 V, which exceeds the Pt/C half-wave potential (E =0.83 V). In addition, Co@CNT/NC has an OER performance close to that of RuO . To further demonstrate the effect of Co modifying on the properties, the samples were subjected to acid washing treatment. Co-based nanoparticles were proved to After acid washing, there was obvious loss of Co particles in Co@CNT/NC, resulting in poor oxygen electrocatalysis. So, the pyrolysis products of ZIF-8-Co O @ZIF-67 retained large specific surface area and porous structure can be retained, and on the other hand, the carbon tube structure and original polyhedron framework. Besides, existence of Co nanoparticle@carbon nanotube provided more active sites and improved the ORR and OER performances.
ISSN:2191-1363