Journal
ELECTROCHIMICA ACTA
Volume 237, Issue -, Pages 37-43Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2017.03.146
Keywords
Silicon-silicon oxide-indium tin oxide; heterojunction; Nickel chloride activation; Spray deposition; Active nickel-based catalyst
Categories
Funding
- New AMP
- Renewable Energy Technology Development Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) [20153030012190, 20153030013200]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT AMP
- Future Planning [2015R1A5A1037548]
- New AMP
- Renewable Energy Technology Development Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) [20153030012190, 20153030013200]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT AMP
- Future Planning [2015R1A5A1037548]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20153030012190, 20153030013200] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Solar-driven water splitting with silicon photoelectrodes exhibiting high solar-to-fuel conversion efficiency is a promising way for producing hydrogen fuel in the future. In this study, a heterojunction photoanode was fabricated by the deposition of a thin indium tin oxide (ITO) layer on n-type silicon/native SiOx. A NiCl2-containing precursor was sprayed on the top of the photoanode, affording a NiO-Cl-OH catalyst; this NiO-Cl-OH catalyst was then activated to form an amorphous and porous NiOOH (a-NiOOH) catalyst, which exhibited enhanced performance. The fabricated Si/SiOx/ITO/a-NiOOH photoanode exhibited a low photocurrent onset potential of similar to 0.98 V vs. RHE, a high saturation photocurrent density of 36.98 mA/cm(2), a photocurrent density of 27.4 mA/cm(2) at the standard oxidation potential of water, and a photovoltage as high as 545 mV under a solar illumination of 100 mW/cm(2). The photocurrent marginally decreased after 30 h. These results suggested that such heterojunctions can replace homogeneous p-n junctions formed from Si doping for high photovoltage generation. In addition, porous a-NiOOH can improve the electrocatalytic performance of Si-based photoanodes. (C) 2017 Elsevier Ltd. All rights reserved.
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