Conformal orthorhombic Fe₂TiO₅ layers are epitaxially grown on the m-planes of the ZnO nanodendrite (ND) scaffold with the lattice matching relations of (100)_Fe2TiO5∥(110)_ZnO and (010)_Fe2TiO5∥(001)_ZnO using metal–organic decomposition. The photoelectrochemical water splitting performance of the epitaxial Fe₂TiO₅/ZnO ND heterojunction array photoanode with an ND length of 2 μm is substantially enhanced compared to the planar Fe₂TiO₅ photoanode. The photocurrent density increases from 0.033 to 1.04 mA cm^–2 at 1.23 V versus reversible hydrogen electrode (RHE) under AM 1.5G (100 mW cm^–2). It is mainly ascribed to the improved charge separation and injection efficiencies of the photoelectrode with a vertical ND structure in coalition with the epitaxial Fe₂TiO₅/ZnO heterojunction of type-II band alignment. At 1.23 V versus RHE, a Faradaic efficiency of ∼90% for solar water oxidation is acquired from the epitaxial Fe₂TiO₅/ZnO ND heterojunction array photoanode. By elongating the length of the ND heterojunction array from 2 to 3 μm, 1.5-fold enhancement in the photocurrent density is obtained because of the decoupled light harvesting and hole transport paths. With further deposition of the cocatalyst cobalt phosphate (Co-Pi), the Co-Pi/Fe₂TiO₅/ZnO ND heterojunction array photoelectrode exhibits a further elevated photocurrent density of 2.14 mA cm^–2 at 1.23 V versus RHE.

中文翻译：

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用于光电化学水氧化的 Fe ₂ TiO ₅ /ZnO 纳米枝晶异质结阵列光电极的光电荷收集的外延、能量和形态协同作用

共形正交 Fe ₂ TiO ₅层外延生长在ZnO 纳米枝晶 (ND) 支架的m平面上，晶格匹配关系为 (100) _Fe2TiO5 ∥(110) _ZnO和 (010) _Fe2TiO5 ∥(001) _ZnO使用金属——有机分解。与平面Fe ₂ TiO _{5 光}阳极相比，ND长度为2 μm的外延Fe ₂ TiO ₅ /ZnO ND异质结阵列光阳极的光电化学水分解性能显着提高。光电流密度从 0.033 增加到 1.04 mA cm ^–2在 1.23 V 与 AM 1.5G (100 mW cm ^–2 )下的可逆氢电极 (RHE )。这主要归因于具有垂直 ND 结构的光电极与II 型能带排列的外延 Fe ₂ TiO ₅ /ZnO 异质结联合提高了电荷分离和注入效率。在相对于 RHE 的 1.23 V 电压下，从外延的 Fe ₂ TiO ₅获得了约 90% 的太阳能水氧化法拉第效率/ZnO ND 异质结阵列光阳极。通过将 ND 异质结阵列的长度从 2 微米延长到 3 微米，由于光收集和空穴传输路径的分离，光电流密度提高了 1.5 倍。随着助催化剂磷酸钴 (Co-Pi) 的进一步沉积，Co-Pi/Fe ₂ TiO ₅ /ZnO ND 异质结阵列光电极在 1.23 V 与 RHE 相比表现出进一步升高的光电流密度 2.14 mA cm ^–2。