Tunable Bifunctional Activity of Mn_xCo_3−xO₄ Nanocrystals Decorated on Carbon Nanotubes for Oxygen Electrocatalysis

Abstract

Invited for this month's cover is the group of Prof. Zhengxiao Guo at the University College London. The image illustrates an integrated manganese cobalt oxide/nitrogen‐doped multiwalled carbon nanotube hybrid (MnCo2O4@NCNT) catalyst for bifunctional oxygen reduction and evolution reactions (ORR/OER), out‐performing the commercial Pt/C and IrO2/C standards, with potential applications for the oxygen electrode in rechargeable metal–air batteries to power drones and electric vehicles. The Full Paper itself is available at https://doi.org/10.1002/cssc.201800049.

Development of Nanosized Mn3O4-Co3O4 on Multiwalled Carbon Nanotubes for Cathode Catalyst in Urea Fuel Cell

“…The fitting peaks were observed at 780.2 and 795.3 eV for the binding energy at a spin energy gap of 15.1 eV, which further verified the presence of Co 3 O 4 in the composite [22]. The presence of Mn 3 O 4 was verified by two peaks at 641.8 and 653.4 eV with a separating energy of 11.6 eV, indicating the Mn2p 3/2 and Mn2p 1/2 spin-orbit states, respectively [23,24]. The C1s deconvolution spectrum contained three distinguished peaks at 284.5, 286.04, and 282.1 eV, which corresponded to carbon atoms bonded to carbon (C-C), oxygen (C-O), and oxygen in carboxyl groups (O-C=O), respectively [25].…”

FexCo3−xO4 Nanohybrids Anchored on a Carbon Matrix for High‐Performance Oxygen Electrocatalysis in Alkaline Media

“…The existence of both Co 2+ /Co 3+ species can be confirmed from the XPS analysis. Two shake‐up satellite peaks at binding energies 802.6 and 786.9 indicate the presence of Co 3 O 4 [45,46] . In the Co 2p profile of Fe 2.1 Co 0.9 O 4 /C, the peaks at 796 and 779.9 eV are observed for Co 2p profile, which correspond to Co 2p 1/2 and Co 2p 3/2 , respectively.…”

“…Two shake-up satellite peaks at binding energies 802.6 and 786.9 indicate the presence of Co 3 O 4 . [45,46] In the Co 2p profile of Fe 2.1 Co 0.9 O 4 /C, the peaks at 796 and 779.9 eV are observed for Co 2p profile, which correspond to Co 2p 1/2 and Co 2p 3/2 , respectively. The satellite peaks are found at 801.8 and 786.7 eV.…”

Carbon-Based Composites as Electrocatalysts for Oxygen Evolution Reaction in Alkaline Media

“…Similarly, carbon fiber paper has been oxidized in HNO 3 by heating at reflux. The precipitates were washed with water until they reached pH 7 and then freeze-dried them to obtain the final oxidized powder [89]. Nickel nitride nanoparticles were supported on 2D graphene oxide, which was previously doped with boron.…”

“…Then ammonia solution was added and the solution was then heated to 80 • C (20 h). Finally, the reaction mixture was transferred to a 100 mL Teflon-lined autoclave for a solvothermal reaction at 150 • C for 3 h. The product was collected by centrifugation, washed with deionized water several times, and freeze-dried to obtain the final product, MCO@NCNTs [89].…”