A carbon-nanotube-supported graphene-rich non-precious metal oxygen reduction catalyst with enhanced performance durability

Abstract

A non-precious metal catalyst for oxygen reduction in acid media, enriched in graphene sheets/bubbles during a high-temperature synthesis step, has been developed from an Fe precursor and in situ polymerized polyaniline, supported on multi-walled carbon nanotubes. The catalyst showed no performance loss for 500 hours in a hydrogen/air fuel cell. The improved durability is correlated with the graphene formation, apparently enhanced in the presence of carbon nanotubes.

Hierarchically porous carbons with optimized nitrogen doping as highly active electrocatalysts for oxygen reduction

“…4c), and even better than most reported metal-containing catalysts (Supplementary Table 6). The more pronounced advantage of meso/micro-PoPD compared with Pt/C at 100 mA cm À 2 was likely because of the hierarchical micro/ mesoporous structure that offered mass-transfer benefits at high current densities 11,35 .…”

Size-controlled large-diameter and few-walled carbon nanotube catalysts for oxygen reduction

“…5,[9][10][11][12] Recently, highly graphitized nitrogendoped nanocarbon materials derived from nitrogen-carbon precursors via a high-temperature approach in the presence of transition metals (TMs, e.g., Fe, Co, Ni) have attracted substantial attention due to their exceptionally high activity and stability compared to other NPMC formulations. 1,3,[13][14][15][16][17][18][19] According to other researchers and ourselves, [20][21][22][23][24][25][26][27][28] in situ formation of graphitized carbon nanostructures in the M-N-C catalysts is a critical factor dictating active site generation and is linked to the measured ORR activity. The currently prepared carbon nanostructures in M-N-C catalysts include tubes, onion-like carbon, and platelets (multi-layered graphene).…”

Catalytic Characteristics of <i>&beta;</i>-Iron Phthalocyanine Prepared by Vacuum Heat Treatment for Fuel Cell Oxygen Reduction Reaction

“…In this study, the collection efficiency was determined to be 0.477 in 0.1 M KNO 3 containing 2 mM K 3 [Fe(CN) 6 ]. The HO 2 ¹ percentages produced by FePc/ C-350, FePc/C-400 and FePc/C-450 were 14.3%, 7.8% and 10.4%, respectively.…”

“…5 High ORR performance Fe-N 4 /C catalysts have been synthesized from rare carbon materials, such as graphene or carbon nanotubes, and nitrogen precursors. [6][7][8] However, synthetic method to obtain these catalysts is complicated and requires strictly controlled conditions.…”