Creation of Triple Hierarchical Micro-Meso-Macroporous N-doped Carbon Shells with Hollow Cores Toward the Electrocatalytic Oxygen Reduction Reaction.

ABSTRACT: A series of triple hierarchical micro-meso-macroporous N-doped carbon shells with hollow cores have been successfully prepared via etching N-doped hollow carbon spheres with CO₂ at high temperatures. The surface areas, total pore volumes and micropore percentages of the CO₂-activated samples evidently increase with increasing activation temperature from 800 to 950 °C, while the N contents show a contrary trend from 7.6 to 3.8 at%. The pyridinic and graphitic nitrogen groups are dominant among various N-containing groups in the samples. The 950 °C-activated sample (CANHCS-950) has the largest surface area (2072 m² g^-1), pore volume (1.96 cm³ g^-1), hierarchical micro-mesopore distributions (1.2, 2.6 and 6.2 nm), hollow macropo

SUBMITTER: Xing R 

PROVIDER: S-EPMC6199056 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature