Electronically modulated d-band centers of MOF-derived carbon-supported Ru/HfO2 for oxygen reduction and aqueous/flexible zinc-air batteries

Mn-Doped Zn Metal–Organic Framework-Derived Porous N-Doped Carbon Composite as a High-Performance Nonprecious Electrocatalyst for Oxygen Reduction and Aqueous/Flexible Zinc–Air Batteries

“…The 30-ZnMn-NC-based ZAB exhibited a high OCV (∼1.30 V) and maintained a stable voltage even at different bending angles, indicating excellent stability and flexibility. 52 These results suggest that 30-ZnMn-NC has promising potential and is compared favorably to the catalysts reported in recent studies (Table S4).…”

“…Moreover, the flexibility and stability of the flexible battery were assessed by measuring the OCVs at various bending angles (0°, 60°, 90°, and returning to 60° and 0°), as demonstrated in Figure d. The 30-ZnMn-NC-based ZAB exhibited a high OCV (∼1.30 V) and maintained a stable voltage even at different bending angles, indicating excellent stability and flexibility . These results suggest that 30-ZnMn-NC has promising potential and is compared favorably to the catalysts reported in recent studies (Table S4).…”

Recent Progress and Prospects of Manganese–Nitrogen–Carbon Electrocatalysts for Oxygen Reduction Reaction

“…During carbonization, MOFs can induce the shrinkage of metal oxide particles in different valence states and lead to the aggregation or collapse of the sintered carbon framework. ,, Large, processable carbon substrates provide an optimal foundation for boosting ORR reactivity owing to their spatially uniform conductive substrate and well-dispersed metal atoms . Additionally, ZIFs as a subset of MOFs, are featured with high porosity, low density, diverse structures, and the presence of unsaturated metal sites. ,,, …”

“…Recently, researchers have focused on investigating efficient, affordable, and exceptionally durable NPG catalysts as substitutes for Pt-based materials. ,− Transition metal–nitrogen–carbon (M–N–C, M = Mn, Fe, Zn, Co, Ni, Cu, etc.) materials have recently become focuses of electrocatalysis research. ,, Metal–nitrogen (M–N x ) groups anchored on carbon substrates exhibit distinctive physicochemical properties, including extensive surface area, excellent electrical conductivity, and an adjustable coordination environment. , The Fe–N x and Co–N x sites are susceptible to attack by reactive oxygen species, including intermediate hydroxyl radicals, during the ORR (Fenton reaction), leading to reduced durability. − In contrast, the catalytic activity of Mn–N x sites in the Fenton reaction is weak, rendering manganese–nitrogen-carbon (Mn–N–C) catalysts promising for catalyzing ORR .…”

Atomically dispersed Ru sites on MOF-derived NC-ZnO for efficient oxygen evolution reaction in acid media

“…1 These catalysts have been used in various transformations such as CO oxidation, 2,3 hydrogenation, 4,5 dehydrogenation, 6 ORR, 7 (HER) 8 OER, 9,10 and other electrocatalytic reactions. [11][12][13] Researchers have spent decades developing potent OER electrocatalysts to improve kinetics, 14,15 particularly in acidic media, facilitating high mass-transfer speed and product purity. 16 Robust and efficient electro-catalysts are required to expedite reaction kinetics.…”