Fabrication of hierarchically porous carbon networks for the electrochemical determination of superoxide anion released from living cells

•Hierarchically porous carbon networks (HPCN) were prepared through TMB-induced self-assembly and carbonization strategy.•The introduction of TMB results in changed morphology, enriched pore structure, and improved defect degree.•The O2− sensor HPCN/SPCE has the potential to distinguish between canc...

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