Cobalt/nitrogen codoped carbon nanosheets derived from catkins as a high performance non-noble metal electrocatalyst for oxygen reduction reaction and hydrogen evolution reaction

Abstract

We prepare highly efficient NPM catalysts of cobalt and nitrogen co-doped carbon nanosheets for oxygen reduction and hydrogen evolution reactions using catkin biomass.

N/P Co‐doped Micro‐/Mesoporous Carbons Derived from Polyvinyl Pyrrolidone–Zn0.2@ZIF‐67 with Tunable Metal Valence States towards Efficient Water Splitting

“…While for those O elements in cobalt oxide, it cannot be substituted by P to form CoP due to the strong ionic bonding of cobalt oxide. When considering the configurations of N atom of CoO x /NCs, its 2p spectrum is divided into three configurations: [42,43] pyridinic N (398.0 eV), pyrrolic N (403.2 eV) and N oxide (405.5 eV) with an atomic percentage of 46.6 %, 45.2 %, and 8.2 % respectively. When introducing phosphorus atoms into carbon frameworks, it can be noticed (Figure S8 c), an increase in the amount of pyrrolic N and correspondingly a decrease in the percentage of pyridinic N suggesting P atoms are introduced into carbon frameworks with similar configuration of pyridinic N. [44] The presence of different nitrogen configurations also provides the possibility to coordinate with metallic actives forming M-N 4 structure which has been reported to facilitate the OER.…”

Waste-Derived Catalysts for Water Electrolysis: Circular Economy-Driven Sustainable Green Hydrogen Energy

“…For instance, Song and co-authors designed Co and N co-doped carbon nanosheets (Co/N-CNSs) for HER from the catkins waste by a ball-milling twostage pyrolysis process (Fig. 3a) [73]. The Co/N-CNSs show good HER activities on account of the formation of well-dispersed CoN x sites on carbon structures.…”

Facile synthesis of efficient Co3O4 nanostructures using the milky sap of Calotropis procera for oxygen evolution reactions and supercapacitor applications

“…To date, the state-of-the-art electrocatalysts for the HER are Pt-based materials and for the OER are Ru/Irbased materials. [29][30][31][32][33][34] These noble metal-based materials are scarce in nature and very expensive, and thus, they cannot be used for large-scale water splitting. Many efficient nonprecious electrocatalysts are reported for the HER, but we still need efficient non-noble electrocatalysts for the OER, since it is very difficult to transfer four electrons and form a double bond during the production of O 2 molecules from water splitting.…”