In situ doped CoCO3/ZIF-67 derived Co-N-C/CoOx catalysts for oxygen reduction reaction

ZIF67@MFC-Derived Co/N-C@CNFs Interconnected Frameworks with Graphitic Carbon-Encapsulated Co Nanoparticles as Highly Stable and Efficient Electrocatalysts for Oxygen Reduction Reactions

“…Here, the reason for the ORR activity in the KOH medium of Co/N-C@CNFs or Co/N-C being different from that in the acidic medium is further discussed. In the alkaline medium, in addition to N-C (pyridinic-N-C, graphitic-N-C) ,, and M/N-C ,, well-known active sites, nanoparticles of metallic Co ,,, and CoO x ,, are also considered to be effective active sites. However, in the acidic medium, one proposed reason to be responsible for the decreased ORR activity for Co-based catalysts is protonation of the nitrogen centers in the acidic medium.…”

“…Development of electrocatalysts with high activity and durability toward the oxygen reduction reaction (ORR) is of great importance because the sluggish kinetics at the cathode usually limits the energy conversion efficiency and performance of fuel cells. − Nowadays, the high-performance electrocatalysts developed and broadly employed for ORR still depend on precious platinum (Pt) and its alloys, yet they still suffer numerous obstacles, including high cost, limited reserve, and various instability problems of Pt for large-scale commercialization. − Therefore, alternative solutions based on carbon-based non-noble metal catalysts, as well as their derivatives and related composites, such as metal oxides, , metal sulfide, , heteroatom doped, − etc., have been explored to develop optimal materials for ORR catalysis over the past decade. Especially, metal/nitrogen-codoped carbon (M/N-C, M = Fe, Co, Ni, etc.…”

Changing charge transfer mode with cobalt–molybdenum bimetallic atomic pairs for enhanced nitrogen fixation

“…S6 †). 48 To explore the surface composition and elemental bonding of the Co-Mo-SA/NC catalysts, the X-ray photoelectron spectroscopy (XPS) test was performed. Fig.…”

Rational Design of Hierarchical, Porous, Co‐Supported, N‐Doped Carbon Architectures as Electrocatalyst for Oxygen Reduction

“…The coordination structure of Co 2 + and 2-methylimidazole can be transformed in situ into aC o-N x structure, and the pore structure, which can be well inherited during the pyrolysis of ZIF-67, endows it with high intrinsic activity and stability of the active sites. [13] However, the catalytic activity is limited because of deep burial of the active sites and low mass transfer of the inherent microporous structure of ZIF-67, which stimulated researchers to solve this problem by combining it with highly conductive and high-surface-area carbon materials such as graphene and carbon nanofibers. [14] Lv et al reportedacomposite of ZIF-67 and carbon derived from reduced graphene oxide,d enoted ZIF-C/rGO, in whichr GO integration led to better charge-transfer channels and more micropores to load active sites.…”