Photoelectrochemical (PEC) technology provides a promising prospect for the transformation of polyethylene terephthalate (PET) plastic wastes to produce value–added chemicals. The PEC catalytic systems with high activity, selectivity and long–term durability are required for the future up–scaling industrial applications. Herein, we employed the interfacial modification strategy to develop an efficient and stable photoanode and evaluated its PEC activity for ethylene glycol (EG, derived from PET hydrolysate) oxidation to formic acid. The interfacial modification between Fe₂O₃ semiconductor and Ni(OH)_x cocatalyst with ultrathin TiO_x interlayer not only improved the photocurrent density by accelerating the kinetics of photogenerated charge carriers, but also kept the high Faradaic efficiency (over 95% in 30 h) towards the value–added formic acid product. This work proposes an effective method to promote the PEC activity and enhance the long–term stability of photoelectrodes for upcycling PET plastic wastes.

光电化学（PEC）技术为聚对苯二甲酸乙二醇酯（PET）塑料废料转化为高附加值化学品提供了广阔的前景。未来大规模工业应用需要具有高活性、选择性和长期耐用性的 PEC 催化系统。在此，我们采用界面改性策略开发了一种高效稳定的光电阳极，并评估了其对乙二醇（EG，源自 PET 水解产物）氧化为甲酸的 PEC 活性。_{Fe 2} O ₃半导体与超薄TiO _{x Ni(OH) x}助催化剂的界面修饰中间层不仅通过加速光生载流子的动力学来提高光电流密度，而且还保持了高法拉第效率（30 小时内超过 95%）对增值甲酸产品。这项工作提出了一种有效的方法来促进 PEC 活性并提高用于升级回收 PET 塑料废物的光电极的长期稳定性。