Single Atoms Anchored on Cobalt-Based Catalysts Derived from Hydrogels Containing Phthalocyanine toward the Oxygen Reduction Reaction

Abstract

Herein, a novel hydrogel-derived three-dimensional network-like nanostructured CoO X /Co–N–C­(800) catalyst was synthesized. CoO X nanoparticles are embedded on N-doped carbon with single Co atoms anchored after pyrolysis. The as-prepared CoO X /Co–N–C­(800) catalyst possesses excellent electrochemical performance toward the oxygen reduction reaction with a positive onset and half-wave potential of 0.95 and 0.88 V (vs RHE), respectively, including almost a four-electron pathway (3.97) and better durability compared with the 20% commercial Pt/C catalyst in an alkaline electrolyte. Also, the results demonstrate that the high performance is attributed to the synergistic effect of CoO X nanoparticles and single Co atoms.

The performance of an atomically dispersed oxygen reduction catalyst prepared by γ-CD-MOF integration with FePc

“…The N 1s peaks in the spectra (Fig. 4c and g) can be divided into ve N types, pyridinic-N (398.2 eV), Fe-N (399.1 eV), pyrrolic-N (400.1 eV), graphitic-N (401.2 eV) and oxidized-N (402.9 eV), [39][40][41] and their relative content is shown in Table S3. † With the increase of the doping amount of melamine, the total content of N in the catalyst is 2.71%, 1.84%, 1.88%, 4.39%, 2.40% and 2.22%, respectively, which increases rst and then decreases.…”

Nitrogen and Sulfur Enriched Porous Carbon Materials with Trace Fe Derived from Hyper‐Crosslinked Polymer as an Efficient Oxygen Reduction Electrocatalyst

“…[7] Since the pioneering work of Jasinski's cobalt phthalocyanine-derived ORR catalysts, [8] several other studies on non-precious metal-based catalysts, predominantly metalÀ NÀ C materials, have been explored. [9] It usually entails the synthesis of metal coordination molecules like phthalocyanine, [10] porphyrin [11] and corrole, [12] etc. The synthesis of such metal coordinating molecules is often impeded by complicated synthetic methods and frequently accompanied by poor yields.…”

N/O‐co‐doped Carbon Shell Structures Loaded with Iron Phthalocyanine for Oxygen Reduction Catalysis

“…[10] Carbon-based transition metal catalysts with MÀ N4 (M = Fe, Co, Ni, Cu) active catalytic sites are of particular interest. [11][12][13][14] The high-temperature heat treatment of transition metals combined with carbon is a common means of generating MÀ N4 sites. During this process, transition metal atoms are anchored to the surface of a carbon-based substrate such that stable oxygen reduction sites are exposed.…”

“…Many current studies on transition metal single‐atom catalysts, such as the single‐atom Cu‐S 1 N 3 reported by Yu and his colleagues, have shown good catalytic activity [10] . Carbon‐based transition metal catalysts with M−N4 (M=Fe, Co, Ni, Cu) active catalytic sites are of particular interest [11–14] . The high‐temperature heat treatment of transition metals combined with carbon is a common means of generating M−N4 sites.…”