Rapid Closed Pore Regulation of Biomass‐derived Hard Carbons Based on Flash Joule Heating for Enhanced Sodium Ion Storage

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Abstract
Closed pores are essential for enhancing the low‐potential (+ channels. This strategy shows remarkable universality and applicability for biomass feedstocks, enabling rapid conversion of various carbonization‐vulnerable precursors to high‐yield (e.g. HC600‐J‐1500 compared with HC25‐J‐1500, ≈14‐fold yield increase) and closed‐pore enriched HCs. The optimized sample demonstrates an outstanding reversible capacity of 377 mAh g −1 with a superior initial Coulombic efficiency of 93.3%, which stands in a record value prepared with FJH and is even competitive via conventional carbonization. Comprehensive tests reveal that the efficient Na storage originates from the pore‐filling mechanism in the closed nanopores. This work suggests a facile and universal closed‐pore regulation approach for the rational design of high‐performance HCs.
Funding Information
  • National Natural Science Foundation of China (52322203)
  • National Natural Science Foundation of China (52473220)
  • Fundamental Research Funds for the Central Universities
  • Key Research and Development Projects of Shaanxi Province (2024GH‐ZDXM‐21)

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