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Silver microelectrode arrays are fabricated by photolithography for a one‐step analysis of H2O2 in low ionic strength samples. The effects of electrode length, width, band‐to‐band separation, connection height, and adhesion layer are evaluated. The developed sensor shows excellent repeatability (RSD=1.20 % (n=5)) and reproducibility (RSD=1.12 % (n=5)) with the linear range of 0.0–10.0 mM, the sensitivity...