Stabilizing Silicon Photocathodes by Solution-Deposited Ni–Fe Layered Double Hydroxide for Efficient Hydrogen Evolution in Alkaline Media
Stabilizing Silicon Photocathodes by Solution-Deposited Ni–Fe Layered Double Hydroxide for Efficient Hydrogen Evolution in Alkaline Media
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DOI：
10.1021/acsenergylett.7b00597
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发表时间：
2017-08
影响因子：
22
通讯作者：
Jiheng Zhao;Lili Cai;Hong Li;Xinjian Shi;Xiaolin Zheng
中科院分区：
文献类型：
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作者：
Jiheng Zhao;Lili Cai;Hong Li;Xinjian Shi;Xiaolin Zheng
实现具有成本效益的光电化学（PEC）太阳能水裂解装置的一个重要途径是稳定和催化硅（Si）光电阴极用于析氢反应（HER），特别是在碱性溶液中。迄今为止，碱性介质中最稳定的Si光电阴极由原子层沉积（ALD）致密TiO 2层保护，并由顶部的贵金属基催化剂催化。然而，ALD工艺难以扩大规模，并且贵金属昂贵。在此，我们报告了使用可扩展的水热方法来存款地球丰富的NiFe层状双氢氧化物（LDH），同时保护和催化硅光电阴极在碱性溶液中的第一个演示。NiFe LDH保护/催化的p型Si光电阴极在0 V vs RHE下显示出7 mA/cm 2的电流密度，与报道的p-n+ Si光电阴极相当的0.3V vs RHE的起始电位，以及在1 M KOH电解液中在10 mA/cm 2下的24 h的耐久性。
An important pathway toward cost-effective photoelectrochemical (PEC) solar water-splitting devices is to stabilize and catalyze silicon (Si) photocathodes for hydrogen evolution reaction (HER), especially in alkaline solutions. To date, the most stable Si photocathode in alkaline media is protected by the atomic layer deposited (ALD) dense TiO2 layer and catalyzed by noble metal-based catalysts on top. However, the ALD process is difficult to scale up, and the noble metals are expensive. Herein, we report the first demonstration of using a scalable hydrothermal method to deposit earth-abundant NiFe layered double hydroxide (LDH) to simultaneously protect and catalyze Si photocathodes in alkaline solutions. The NiFe LDH-protected/catalyzed p-type Si photocathode shows a current density of 7 mA/cm2 at 0 V vs RHE, an onset potential of ∼0.3 V vs RHE that is comparable to that of the reported p–n+ Si photocathodes, and durability of 24 h at 10 mA/cm2 in 1 M KOH electrolyte.