As a promising solution to renewable energy source and self-powered sensing, photoelectrochemical (PEC) devices have attracted extensive research interests in recent years. In this work, a PEC device is developed by sequentially incorporating graphene and titanium dioxide (TiO₂) nanoparticle multilayers using layer-by-layer (LbL) self-assembly. As a mediation layer between the TiO₂ nanoparticle film and the gold substrate, compact graphene layer effectively facilitates the separation of electrons and holes, yielding significantly higher quantum efficiency. Dependent on the concentration of TiO₂ nanoparticle suspension, graphene intercalation layer enhances more than one order of magnitude photocurrent amplification under UV light illumination, ranging from 12 to 43 times. The low-cost and facile fabrication processes to generate a stable photocurrent output of this device implies its promising potential applications to sensing and energy harvesting.

作为可再生能源和自供电传感的有前途的解决方案，近年来，光电化学（PEC）器件引起了广泛的研究兴趣。在这项工作中，通过逐层（LbL）自组装顺序加入石墨烯和二氧化钛（TiO ₂）纳米颗粒多层，从而开发出PEC器件。致密的石墨烯层作为TiO ₂纳米颗粒膜和金基底之间的介导层，有效地促进了电子和空穴的分离，从而显着提高了量子效率。取决于TiO ₂的浓度纳米粒子悬浮液，石墨烯嵌入层在紫外光照射下增强了超过一个数量级的光电流放大，范围为12至43倍。能够产生稳定的光电流输出的低成本，简便的制造工艺意味着该器件在传感和能量收集方面的潜在应用前景广阔。