Manipulating Surface Chemistry on the Microarchitecture of Coal-Based Hard Carbon for Improved Sodium Storage.

ABSTRACT: The aromatic nature of coal results in highly graphitized hard carbon (HC), which significantly impacts its sodium storage performance. Constructing oxygen-containing functional groups (OFGs) can effectively enhance sodium storage performance, but the mechanistic role of OFGs in governing the surface chemical evolution of coal-based HC remains poorly understood. Herein, OFGs are introduced into coal molecules through various pre-oxidation methods. Comprehensive in situ/ex situ testing elucidated that different OFGs have different effects on the intramolecular rearrangement of coal. Compared with C═O, -OH, and C─O─C groups, the carboxyl can inhibit decarboxylation during pyrolysis, raising the upper limit of the temperature window for intramolecular carbon rearrangement from 500 to 600 °C.

SUBMITTER: Zhang W 

PROVIDER: S-EPMC12697760 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature