In this study, a facile chemical approach was utilized to successfully fabricate a porous bismuth ferrite (BiFeO₃, BFO)/reduced graphene oxide (rGO) nanocomposite thin film as a photoanode for photoelectrochemical (PEC) water splitting. The BFO nanoparticles possess a pure rhombohedral distorted perovskite crystal structure and are grafted onto rGO nanosheets. BFO/rGO (BGO) thin film has smaller nanoparticles (around 100 nm) and higher porosity which provides a higher surface area compared to BFO. Moreover, BGO exhibits higher visible absorption, a narrower band gap energy of 1.95 eV, and a lower recombination rate of charge carriers. The BGO photoanode has a maximum photocurrent density of 0.451 mA.cm^-2 at 1.23 V versus the reversible hydrogen electrode (RHE) under 100 mW.cm^-2 illumination which is 2.5 times more than the BFO photoanode. The applied bias photon-to-current efficiency (ABPE) of BGO nanocomposite film is 0.21%, which is approximately 2.5 times that of BFO. The obtained results reveal an intimate heterostructure between BFO nanoparticles and rGO nanosheets. The charge separation and transfer of BFO are significantly boosted by incorporating the rGO. This study sheds light on the mechanism insights of enhanced PEC water splitting in BFO/rGO thin film, offering a new approach to the design and fabrication of high-efficiency photoanodes.

在这项研究中，利用简便的化学方法成功制造了多孔铁酸铋（BiFeO ₃，BFO）/还原氧化石墨烯（rGO）纳米复合薄膜作为光电化学（PEC）水分解的光阳极。BFO 纳米粒子具有纯菱面体扭曲的钙钛矿晶体结构，并接枝到 rGO 纳米片上。BFO/rGO (BGO) 薄膜具有更小的纳米粒子（约 100  nm）和更高的孔隙率，与 BFO 相比，可提供更高的表面积。此外，BGO 表现出更高的可见光吸收、更窄的 1.95 eV 带隙能量 和更低的载流子复合率。BGO 光电阳极在 1.23 时的最大光电流密度为 0.451  mA.cm ^-2  在 100 mW.cm ^-2光照下，V 与可逆氢电极 (RHE) 的关系是 BFO 光阳极的 2.5 倍。BGO纳米复合薄膜的外加偏置光子电流效率（ABPE）为0.21%，约为BFO的2.5倍。获得的结果揭示了 BFO 纳米颗粒和 rGO 纳米片之间的紧密异质结构。BFO 的电荷分离和转移通过加入 rGO 得到显着提高。本研究揭示了 BFO/rGO 薄膜中增强 PEC 水分解的机制见解，为高效光阳极的设计和制造提供了一种新方法。