A visible light responsive heterojunction system composed of Fe₂O₃ nanorods (NF), reduced graphene oxide (rGO) and double oxide perovskites (LaSrFe_2–nCo_nO₆, n = 1 (LSFC) and 0 (LSFF)) was rationally designed for an effective photoelectrochemical water splitting. The photoelectrodes were characterized in terms of structure, surface, physicochemical and functional properties with a focus on the electronic structure (e.g., the density of electronic states, band-edge, Fermi level positions), which was gauged from UPS, Kelvin probe (KP) and spectroelectrochemical (SE-DRS) measurements. The KP measurements not only revealed the successful and efficient contact of the materials with different work functions but also showed the drift direction of photogenerated charges. In the studied systems, the transparent, thin layer of rGO facilitates the hole transfer from NF (photoabsorber) to perovskites (electrocatalyst). The hydrogen conversion efficiency under visible and solar simulated irradiation for NF@rGO@LSFF reached remarkable values of 3.61 % and 1.13 % (STH), respectively.

可见光响应异质结系统由Fe ₂ O ₃纳米棒（NF），还原氧化石墨烯（rGO）和双氧化物钙钛矿组成（LaSrFe _{2– n} Co _n O ₆，n = 1（LSFC）和0（LSFF））。合理设计用于有效的光电化学水分解。根据结构，表面，物理化学和功能特性对光电极进行了表征，重点是电子结构（例如（电子状态密度，带边缘，费米能级位置），可以通过UPS，开尔文探针（KP）和光谱电化学（SE-DRS）测量进行测量。KP测量不仅揭示了材料具有不同功函数的成功和有效接触，还显示了光生电荷的漂移方向。在研究的系统中，rGO的透明薄层促进了空穴从NF（光吸收剂）到钙钛矿（电催化剂）的转移。在可见光和太阳光模拟照射下，NF @ rGO @ LSFF的氢转化效率分别达到3.61％和1.13％（STH）的显着值。