Designing low-cost, easy-fabricated, highly stable and active electrocatalysts for oxygen evolution reaction (OER) is crucial for electrochemical (EC) and solar-driven photoelectrochemical (PEC) water splitting. By using a facile heating-electrodeposition method, here we fabricated a porous but crystalline Fe-doped Ni₃S₂. A thin porous surface NiFe hydroxide layer (∼10 nm) is then formed through OER-running. By virtue of the core Fe-doped Ni₃S₂ with good conductivity and the shell NiFe hydroxide surface with good electrocatalytic activity, the core-shell nanostructure on Ni foam exhibits excellent OER activity in 1 M NaOH, needing only 195 mV and 230 mV to deliver 10 and 100 mA/cm², respectively, much more superior to those of 216 and 259 mV for the sample deposited under normal temperature. The enhanced photo-response of the sulfide@hydroxide core-shell structure was also demonstrated, due to the efficient transfer of photo-generated carriers on the core/shell interface. More interestingly, it shows a good compatibility with Si based photoanode, which exhibits an excellent PEC performance with an onset potential of 0.86 V vs. reversible hydrogen electrode, an applied bias photon-to-current efficiency of 5.5% and a durability for over 120 h under AM 1.5 G 1 sun illumination, outperforming the state-of-the-art Si based photoanodes.

设计用于氧气析出反应（OER）的低成本，易于制造，高度稳定和活性的电催化剂对于电化学（EC）和太阳能驱动的光电化学（PEC）水分解至关重要。通过使用简便的加热-电沉积方法，我们在这里制造了多孔但结晶的掺铁的Ni ₃ S ₂。然后通过运行OER形成一层薄的多孔NiFe氢氧化物表面（约10 nm）。凭借具有良好电导率的掺杂铁芯的Ni ₃ S ₂和具有良好电催化活性的壳NiFe氢氧化物表面，在1M NaOH中，镍泡沫上的核-壳纳米结构具有出色的OER活性，仅需195 mV和230 mV输送10和100 mA / cm ²分别比常温下沉积的样品的216和259 mV的要好得多。由于光生载流子在核/壳界面上的有效转移，还证明了硫化物@氢氧化物核-壳结构的增强的光响应。更有趣的是，它显示出与基于Si的光电阳极的良好兼容性，后者具有出色的PEC性能，与可逆氢电极相比的起始电势为0.86 V ，施加的偏压光子电流效率为5.5％，并且具有超过120的耐久性h在AM 1.5 G 1阳光照射下，表现优于最先进的Si基光阳极。