Stabilizing Silicon Photocathodes by Solution-Deposited Ni-Fe Layered Double Hydroxide for Efficient Hydrogen Evolution in Alkaline Media

Jiheng Zhao, Lili Cai, Hong Li, Xinjian Shi, Xiaolin Zheng

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish (US)
Pages (from-to)1939-1946
Number of pages8
JournalACS Energy Letters
Volume2
Issue number9
DOIs
StatePublished - Sep 8 2017
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Materials Chemistry

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