The development of photoanodes capable of photoelectrochemical water splitting is a sustainable approach for the storage of solar power to conveniently useable chemical energy. In this study, we report that amorphous CoP film can be grown on α-Fe₂O₃ nanorods to fabricate a core-shell structure via a simple reductive electrodeposition strategy. Under the irradiation of simulated sunlight (100 mW cm⁻²), the composite electrode shows that the onset potential demonstrates a 200 mV cathodic shift and the photocurrent density is enhanced from 0.45 to 0.90 mA cm⁻² at 1.23 V vs reversible hydrogen electrode (RHE) when compare with the bare α-Fe₂O₃ electrode in 1 M KOH electrolyte. Long-term photoelectrolysis reveals that this electrode has excellent stability and possesses a near-unity Faradaic efficiency toward oxygen evolution. Mechanistic studies support the role of CoP film in enhancing photoelectrochemical performance and indicate that the remarkable photoelectrochemical performance of this composite electrode is mainly due to the retardation of surface photogenerated h⁺/e⁻ recombination.

能够进行光电化学水分解的光阳极的开发是一种将太阳能存储为方便使用的化学能的可持续方法。在这项研究中，我们报道了无定形的COP膜可以在的α-Fe中生长_2个ö ₃纳米棒通过一个简单的还原性电沉积的策略来制造核-壳结构。在可模拟的阳光（100 mW cm ^-2）的照射下，复合电极显示出起始电位显示200 mV的阴极位移，并且在1.23 V下，光电流密度从0.45增强到0.90 mA cm ^-2，而可逆氢电极（ RHE）当与裸比较的α-Fe ₂ ö ₃电极置于1 M KOH电解液中。长期的光电解显示该电极具有出色的稳定性，并且对氧的释放具有几乎统一的法拉第效率。机理研究支持COP膜的作用增强光电化学性能和表明该复合电极的显着性能光电主要是由于表面的相位差的光生ħ ⁺ / E ^-重组。