Mg-doped CoCr2O4 nanoparticles with fast humidity sensing and mixed-controlled pseudocapacitive charge storage

doi:10.1016/j.cej.2026.175200

Mg-doped CoCr2O4 nanoparticles with fast humidity sensing and mixed-controlled pseudocapacitive charge storage

2026-03-25

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Mithun Prakash Ravikumar

DOI：10.1016/j.cej.2026.175200

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• Mg substitution (0–20%) simultaneously tunes mesoporosity and defect chemistry in CoCr2O4 spinel nanoparticles. • 20% Mg-doped CoCr2O4 achieves fast humidity response/recovery (13/8 s) from 7–97% RH with low hysteresis. • Diffusion-dominated pseudocapacitance is supported by b ≈ 0.73–0.76 and a strongly reduced charge-transfer resistance. • A high electrode-level capacitance of 487.8 F g−1 at 5 mV s−1 and 88.9% retention after 5000 cycles. • Mechanistic correlation links Mg-induced oxygen vacancies/mesopores to proton transport and redox kinetics.

Keywords:

Mg-doped CoCr2O4

humidity sensing

pseudocapacitance

oxygen vacancies

mesoporosity

Mg-doped CoCr2O4 nanoparticles with fast humidity sensing and mixed-controlled pseudocapacitive charge storage

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