An easy effective method for the activation of commercial screen-printed carbon electrodes (SPCEs) using H₂O₂ is presented to enhance sensing performances of carbon ink. Electrochemical activation consists of 25 repetitive voltammetric cycles at 10 mV s⁻¹ using 10 mM H₂O₂ in phosphate buffer (pH 7). This treatment allowed us to reach a sensitivity of 0.24 ± 0.01 μA μM⁻¹ cm⁻² for the electroanalysis of H₂O₂, which is 140-fold higher than that of untreated SPCEs and 6-fold more than screen-printed platinum electrodes (SPPtEs). Electrode surface properties were characterized by SEM, EIS and XPS. The results revealed atomic level changes at the electrode surface, with the introduction of new carbon‑oxygen groups being responsible for improved electro-transfer properties and sensitivity. Our method was compared with other previously described ones. The methodology is promising for the activation of commercial carbon inks-based electrodes for sensor applications.

提出了一种使用H ₂ O ₂激活商业丝网印刷碳电极（SPCE）的简便有效的方法，以增强碳墨水的感测性能。使用磷酸盐缓冲液（pH 7）中的10 mM H ₂ O ₂，在10 mV s ^-1下，电化学激活包括25个重复的伏安循环。这种处理使我们对H ₂ O ₂的电分析灵敏度达到0.24±0.01μAμM ^-1  cm ^-2。比未处理的SPCE高140倍，比丝网印刷的铂电极（SPPtE）高6倍。通过SEM，EIS和XPS表征电极表面性能。结果表明，随着新的碳氧基团的引入，电极表面的原子能级发生了变化，从而改善了电传输性能和灵敏度。我们的方法与其他先前描述的方法进行了比较。该方法有望激活用于传感器应用的商用碳墨水基电极。