Abstract:

To address the issue of poor kinetic stability of traditional catalyst-supported electrodes, this study proposed an effective method for preparing an alloy electrode for the oxygen evolution reaction (OER) through mixed electroplating of ruthenium, iridium, and strontium. Experiments revealed that the active metal elements of the OER electrodes electroplated with ruthenium, strontium, or iridium alone were continuously oxidized and consumed during the reaction, resulting in a rapid decline in electrode activity with an increase in the number of reactions. By electroplating a mixture of ruthenium, strontium, and iridium, the durability of the metal coating was significantly enhanced. The experiments demonstrated that the maximum catalytic efficiency was achieved after 60 minutes of electroplating. The onset potential of the OER of the electrode decreased from 0.6—0.8V to 0.6V, and the limiting current increased from 0.04—0.18mA to 3.19mA. The mean value of the acid-base mass transfer control signal from multiple measurements reached 3.19mA, with a relative standard deviation (RSD) of 0.72%. The activity and kinetic stability of the OER were significantly enhanced. The mixed-plated electrode was proven to be reliable in the detection of acid-base mass transfer control signals, and the detected control signals were consistent with the theoretical ones. Therefore, this study developed a method for rapidly constructing an OER alloy electrode based on the electroplating of ruthenium, strontium, and iridium, which significantly improved the activity and stability of the OER and enabled the stable determination of acid-base mass transfer control signals, providing a reliable electrode preparation strategy for the construction and development of the sensors of this signal.

Key words: catalyst, activation, electrochemistry, oxygen evolution reaction, acid-base mass transfer

摘要：

针对传统催化剂负载型电极动力学稳定性差的问题，本文提出了一种混合电镀钌、铱、锶制备析氧反应合金电极的有效方法。实验发现，单独电镀钌、锶、铱析氧电极的活性金属元素在反应过程中会不断氧化消耗，导致电极活性均随反应次数增加而快速衰减。通过钌、锶、铱混合电镀，金属镀层耐久性大大提高。实验证明，电镀60min即达到最大催化效率，电极析氧反应起始电位从0.6~0.8V降至0.6V，极限电流从0.04~0.18mA提升至3.19mA，多次测量的酸碱传质控制信号均值达到3.19mA，相对标准偏差（RSD）为0.72%，析氧反应活性及动力学稳定性显著增强。最终证明该混合镀电极是酸碱传质控制信号检测的可靠电极，检测到的酸碱传质控制信号关系均符合酸碱传质理论推导结果。本文提出的基于钌、锶、铱电沉积快速构筑析氧反应合金电极的方法，显著提高了析氧反应活性与稳定性，实现了酸碱传质控制信号稳定测定，为基于该信号的传感器构建及技术发展提供了可靠的电极制备策略。

关键词: 催化剂, 活性, 电化学, 析氧反应, 酸碱传质