In situ preparation of hollow Mo₂C–C hybrid microspheres as bifunctional electrocatalysts for oxygen reduction and evolution reactions

Abstract

Yolk–shell structured Mo2C–C hybrid microspheres with enhanced catalytic activity for both the ORR and the OER have been prepared through an in situ synthetic route.

Ni Strongly Coupled with Mo2C Encapsulated in Nitrogen‐Doped Carbon Nanofibers as Robust Bifunctional Catalyst for Overall Water Splitting

“…Nevertheless, Ni nanoparticles are prone to aggregation under typical HER and OER conditions, such as strong acid and alkali, and are prone to be corroded and passivated. [38][39][40][41][42] For instance, Kwak et al has successfully prepared Mo 2 C/carbon nanotube composites as bifunctional catalysts for both ORR and OER. [24][25][26][27] Among them, molybdenum carbide (Mo 2 C) is interesting due to its innocuous preparation process, large pH stability, and equivalent d-band electronic structure to Pt-group metals, [28][29][30][31] demonstrating a It is urgently required to develop highly efficient and stable bifunctional non-noble metal electrocatalysts for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) for water splitting.…”

Heterogeneous Mo2C/Fe5C2 Nanoparticles Embedded in Nitrogen‐Doped Carbon as Efficient Electrocatalysts for the Oxygen Reduction Reaction

“…The peaks located at binding energies of 232.0 and 228.8 eV are assigned to Mo 2 C, which are consistent with the presence of Mo in the carbide phase. Additionally, the peaks at 232.7 (Mo 4+ 3d 3/2 ) and 229.3 eV (Mo 4+ 3d 5/2 ) are corresponded to MoO 2 , and the peaks at 235.4 (Mo 6+ 3d 3/2 ) and 236.2 eV (Mo 6+ 3d 5/2 )belong to MoO 3 , which are resulted from the partial surface oxidation of the as‐obtained Mo 2 C nanoparticles that exposed in air , . The high‐resolution Fe 2p (Figure e) was deconvoluted into four peaks.…”

“…For example, transition metal phosphide, chalcogenides,, oxides,, carbides,, nitrides,, transition metal nitrogen‐containing complexes , . Among these candidates, transition metal carbides (TMC), such as Mo 2 C, Fe 5 C 2 and WC, have attracted a great attention due to their Pt‐group‐metals‐like electronic configuration and catalytic properties, while significantly reducing costs . Recently, they have received renewed research interest as advanced materials of alternative noble‐metal electrocatalysts.…”

“…This combination of features results in many appealing properties such as abundant exposed active sites and rapid electron transfer. Furthermore, Yang et al reported, that Mo 2 C@C hybrid microspheres as bifunctional catalysts for the ORR and HER. However, to the best of our knowledge, there are few reports on the ORR catalytic activity of Mo 2 C or its derivatives in previous literatures.…”

Transition Metal Carbide Complex Architectures for Energy‐Related Applications

“…The structural advantages enable the Ni‐Mo 2 C hollow spheres to act as an excellent HER catalyst with an overpotential of 123 mV at the current density of 10 mA cm −2 in 1.0 m KOH. Yang and co‐workers also reported the synthesis of hollow Mo 2 C‐C spheres by using synchronously prepared carbon microspheres as a self‐sacrificial template . Benefiting from the unique architecture, the hollow Mo 2 C‐C spheres demonstrate bifunctional ORR and OER performances in terms of excellent catalytic activities and stabilities.…”