Short-range amorphous carbon nanosheets for oxygen reduction electrocatalysis

Abstract

Selectively creating active sites those can work well in different medium as much as possible remains an open challenge for the widespread application of sustainable metal air batteries and fuel...

Red Bean Pod Derived Heterostructure Carbon Decorated with Hollow Mixed Transition Metals as a Bifunctional Catalyst in Zn‐Air Batteries

“…While defects in the amorphous part can serve as additional ORR active sites, the presence of sp 2 bonding possesses high conductivity and structural robustness, which may facilitate the electron transfer and enhance the stability of the catalyst, respectively [8] . Thus, such heterostructure of carbon is desirable to provide catalytically active, stable, and conductive support for the FeCo nanoparticles.…”

“…A number of potentially bifunctional catalysts, such as transition metals and heteroatom‐doped carbon‐based materials, have been explored due to their high catalytic activity, abundant resources, and ease of synthesis [6] . In general, the heterostructure carbon (i. e., carbon with both amorphous and graphitic structure) has a disordered atomic structure, creating defects that can serve as the active sites for catalytic activity [7,8] . Previous works on heterostructure carbon exhibited synergistic properties, where the graphitic portion enhances the electron transfer, and the defects in the amorphous counterpart serve as the ORR active sites [8,9] .…”

“…In general, the heterostructure carbon (i. e., carbon with both amorphous and graphitic structure) has a disordered atomic structure, creating defects that can serve as the active sites for catalytic activity [7,8] . Previous works on heterostructure carbon exhibited synergistic properties, where the graphitic portion enhances the electron transfer, and the defects in the amorphous counterpart serve as the ORR active sites [8,9] . Moreover, the catalytic activity of such heterostructure carbon can be further improved by introducing heteroatom dopants.…”

Manipulation on Two-Dimensional Amorphous Nanomaterials for Enhanced Electrochemical Energy Storage and Conversion

“…Sun and co-workers developed biomassderived oxygen-doped amorphous carbon nanosheets with high electrochemical selectivity and activity for NRR [90]. Similarly, highly efficient ORR catalysts with abundant active sites and high conductivity were fabricated by doping N or P into amorphous carbon sheets [91,92]. As mentioned above, amorphous nanosheets possess flexible morphology and structure, which can provide an ideal platform for supporting or embedding nanoparticles.…”

A nitrogen-doped amorphous/graphitic hybrid carbon material derived from a sustainable resource for low-cost K-ion battery anodes

“…In particular, the coexistence of graphitized and amorphous carbon, which have high conductivity and large active sites, respectively, leads to improved battery performance. [16][17][18] However, the insertion/ deintercalation of K + , which has a larger ionic structure compared to Li + and Na + , is relatively lower owing to a narrow interlayer distance (3.35 A) and unfavorable stacking, ultimately resulting in poor cycling stability and rate capability. Furthermore, the processing of synthetic carbon is challenging and comparatively expensive, rendering it unsustainable for commercial use.…”