Amorphous Si Thin Film Based Photocathodes with High Photovoltage for Efficient Hydrogen Production

An amorphous Si thin film with TiO2 encapsulation layer is demonstrated as a highly promising and stable photocathode for solar hydrogen production. With platinum as prototypical cocatalyst, a photocurrent onset potential of 0.93 V vs RHE and saturation photocurrent of 11.6 mA/cm(2) are measured. Importantly, the a-Si photocathodes exhibit impressive photocurrent of similar to 6.1 mA/cm(2) at a large positive bias of 0.8 V vs RHE, which is the highest for all reported photocathodes at such positive potential. Ni-Mo alloy is demonstrated as an alternative low-cost catalyst with onset potential and saturation current similar to those obtained with platinum. This low-cost photocathode with high photovoltage and current is a highly promising photocathode for solar hydrogen production.


Published in:
Nano Letters, 13, 11, 5615-5618
Year:
2013
Publisher:
Washington, American Chemical Society
ISSN:
1530-6984
Keywords:
Note:
IMt-NE Number : 764
Laboratories:


Note: The status of this file is: EPFL only


 Record created 2014-01-09, last modified 2018-03-17

Publisher's version:
Download fulltext
PDF

Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)