The large-scale application of oxygen evolution reaction electrocatalysts is limited by many challenges such as sluggish kinetics, low conductivity, and instability. Remarkably, Co³⁺ plays a vital role in oxygen evolution catalytic process because Co³⁺ ions are regarded as active sites. Developing catalysts with high Co³⁺ content is highly promising to improve the efficiency of water oxidation. In this study, we report a novel design method through controlling pH value and potential guided by Pourbaix diagram to synthesize surface Co³⁺-rich catalyst. The as-prepared catalyst possesses enhanced electrode-electrolyte contact area and lower diffusion resistance. In alkaline media, this catalyst exhibits promising oxygen evolution performance, with lower onset overpotential, satisfactory overpotential, and high value of turnover frequency (TOF).

放氧反应电催化剂的大规模应用受到许多挑战的限制，例如动力学缓慢，电导率低和不稳定。值得注意的是，Co ³⁺在氧释放催化过程中起着至关重要的作用，因为Co ³⁺离子被认为是活性位点。开发具有高Co ³⁺含量的催化剂非常有希望提高水氧化效率。在这项研究中，我们报告了一种新的设计方法，该方法通过控制pH值和以Pourbaix图指导的电位来合成表面Co ³⁺富含催化剂。所制备的催化剂具有增强的电极-电解质接触面积和较低的扩散阻力。在碱性介质中，该催化剂表现出令人鼓舞的氧气释放性能，具有较低的起始过电势，令人满意的过电势和高周转率（TOF）。