Solar-driven photoelectrochemical water splitting is a promising solution to energy problem. However, not-yet-available long-term stability of photoelectrodes inhibits their practical application. Introducing structure tunable, highly active and easily prepared molecular catalysts is an efficient approach to improve their stability and has recently attracted great attention. Nonetheless, the long-term stability is still challenged due to regeneration of molecular catalyst during stability test. Herein, tannic acid coordinated with Ni and Fe ions (TANF) molecular catalyst is immobilized on BiVO₄ photoanode for oxygen evolution reaction (OER). Taking advantage of the regeneration of molecular catalyst, effects of buffer species on activity, stability and regeneration of TANF/BiVO₄ photoanodes are investigated. In an optimal borate electrolyte, the TANF/BiVO₄ photoanode shows nearly no-decay after operating at harsh conditions (at 1.2 V_RHE with continuous light illumination) for 62 h. The long-term stability profits from the regenerated catalyst, which is composed of a carbon conductive network with metal oxides/hydroxides as OER-active sites. This excellent stability of the integrated photoanode surpasses most of existing OEC/BiVO₄ photoanodes, and the stabilized catalyst is comparable with the state-of-the-art FeOOH/NiOOH dual-cocatalyst and ferrihydrite catalyst.

太阳能驱动的光电化学水分解是解决能源问题的有前途的解决方案。然而，尚未获得的光电极的长期稳定性阻碍了它们的实际应用。引入结构可调，高活性和易于制备的分子催化剂是提高其稳定性的有效方法，最近引起了极大的关注。尽管如此，由于稳定​​性测试过程中分子催化剂的再生，长期稳定性仍然受到挑战。在此，与Ni和Fe离子（TANF）分子催化剂配位的单宁酸被固定在BiVO ₄光电阳极上用于氧释放反应（OER）。利用分子催化剂的再生，缓冲剂种类对TANF / BiVO ₄活性，稳定性和再生的影响研究了光阳极。在最佳的硼酸盐电解液中，TANF / BiVO ₄光电阳极在苛刻的条件下（在1.2 V _RHE下，连续照明）工作62小时后，几乎没有衰减。再生催化剂具有长期稳定性，该催化剂由碳导电网络和金属氧化物/氢氧化物作为OER活性位点组成。集成光阳极的出色稳定性超过了大多数现有的OEC / BiVO ₄光电阳极，并且稳定的催化剂可与最新的FeOOH / NiOOH双助催化剂和三水铁矿催化剂媲美。