pH is a fundamental parameter in understanding the chemical processes in many fields. Based on the strong oxidative characteristic of the molten lithium carbonate (Li₂CO₃), an advanced iridium oxide electrode preparation approach is developed by adding sodium peroxide (Na₂O₂) powder into a Li₂CO₃ melt in a semi-closed/closed reactor at a high temperature to increase the regional peroxide (O₂²⁻) ion concentration in the iridium-melt interface. The iridium oxide film (IROF) of prepared electrodes has a dense and uniform surface with small and cone-shaped particles. Open-circuit tests show that electrodes exhibit a near-Nernstian pH response with good linearity, fast response, high stability (a slight periodic fluctuation of potential change with standard deviation <0.65 mV in 48 h), good reversibility in the pH range of 2.00–10.00, and anti-interference to low concentration of oxidants. Besides, electrodes show a stable response in seawater, indicating the major ions in seawater do not influence their performances. In addition, prepared electrodes from the same batch show consistency in terms of sensitivity and the intercept of the standard curve (E°^'), while electrodes from different batches vary in E°^', which could be attributed to the hardness in controlling identical synthetic conditions among fabrications of different batches.

pH是了解许多领域化学过程的基本参数。基于熔融碳酸锂（Li ₂ CO ₃）的强氧化特性，开发了一种先进的制备铱电极的方法，该方法是将过氧化钠（Na ₂ O ₂）粉末添加到半封闭的Li ₂ CO ₃熔体中。 /密闭反应器在高温下增加区域过氧化物（O ₂ ^2-）在铱熔体界面的离子浓度。所制备电极的氧化铱膜（IROF）具有致密且均匀的表面，且具有小且呈圆锥形的颗粒。开路测试表明，电极表现出近Nernstian的pH响应，具有良好的线性，快速响应，高稳定性（电势变化略有周期性波动，在48小时内标准偏差<0.65 mV），在2.00的pH范围内具有良好的可逆性–10.00，并抗干扰低浓度的氧化剂。此外，电极在海水中显示出稳定的响应，表明海水中的主要离子不会影响其性能。此外，从同一批次制备的电极在灵敏度和标准曲线的截距（E ° ^'），而不同批次的电极的E ° ^'有所不同，这可能归因于在不同批次的制造中控制相同合成条件时的硬度。