Electrochemistry Communications ( IF 5.4 ) Pub Date : 2017-11-10 , DOI: 10.1016/j.elecom.2017.11.008 Yansong Zhu , Yueqin Wang , Sanmei Liu , Ruike Guo , Zelin Li
Controllable loading of NiFe-based semiconductor electrocatalysts is critical for high performance toward the oxygen evolution reaction (OER) because of their low conductivity. In this work, for the first time, Fe(OH)3/NiS composite nanolayers with high-performance for OER are synthesized in a controllable way at an ionic layer level. Specific amounts of NiS and Fe(OH)3 are loaded onto coral-like CuO/Cu microarrays (c-CuO/Cu) in an easily controlled way by successive ionic layer adsorption and reaction (SILAR); the resulting OER activity depends heavily on the number of SILAR cycles. The optimized Fe(OH)3/NiS/c-CuO/Cu electrode exhibits a very low OER overpotential of 257 mV (vs. RHE) at 10 mA/cm2 (with no IR compensation) in 1 M KOH and is stable toward OER for at least 10 h. We also prepared high-performance Fe(OH)3/Ni(OH)2/c-CuO/Cu OER electrocatalysts in a similar way. It is expected that this approach will be used to fabricate further semiconductor electrocatalysts for water splitting.
中文翻译:
高性能,镍铁基纳米膜电催化剂在离子层水平上的可控合成,用于碱性电解液中的氧释放反应
基于NiFe的半导体电催化剂的可控负载量因其低电导率而对于实现氧释放反应(OER)的高性能至关重要。在这项工作中,首次以可控的方式在离子层水平上合成了对OER具有高性能的Fe(OH)3 / NiS复合纳米层。通过连续的离子层吸附和反应(SILAR),可以轻松控制的方式将特定量的NiS和Fe(OH)3加载到珊瑚状的CuO / Cu微阵列(c-CuO / Cu)中;产生的OER活动在很大程度上取决于SILAR循环数。优化的Fe(OH)3 / NiS / c-CuO / Cu电极在10 mA / cm 2时具有257 mV(vs. RHE)的非常低的OER过电势(无红外补偿)在1 M KOH中,并且对OER稳定至少10 h。我们还以类似方式制备了高性能Fe(OH)3 / Ni(OH)2 / c-CuO / Cu OER电催化剂。预期该方法将用于制造用于水分解的其他半导体电催化剂。