Low Pt loading, wide area electrospray deposition technique for highly efficient hydrogen evolving electrode in photoelectrochemical cell

Title
Low Pt loading, wide area electrospray deposition technique for highly efficient hydrogen evolving electrode in photoelectrochemical cell
Authors
야다브박종원정광덕주오심
Keywords
Hydrogen production; Photoelectrochemical cell; Pt film; Electrospray deposition; SEM; XPS
Issue Date
2010-07
Publisher
International journal of hydrogen energy
Citation
VOL 35, NO 13, 6541-6548
Abstract
Environmental compatibility, high flammability, richest in energy per mass unit, and easy conversion into thermal, mechanical and electrical energy are the key advantages of hydrogen fuel, which makes it an idealized vision for future energy as a promising alternative to the diminishing fossil fuels. Unlike the methods very well known in the literature, we used environmental benign photoelectrochemical (PEC) hydrogen production method. Pt is one of the promising electrode materials for PEC method, but high cost makes it impractical for commercialization. A methodology for low Pt loading (7.22 × 10−5 g cm−2) based on electrospray technique is explained for the preparation of hydrogen evolution electrode. The resulted films are annealed at different temperatures and investigated by different characterization techniques that showed surface morphological and compositional changes with annealing temperature. The pores-type structure is transformed to vertically aligned plate-like structure with annealing temperature. After annealing at 400 °C, Pt film is more oxidized and enriching about ~30% of film surface area with oxidized Pt. The solar to hydrogen conversion efficiency in water splitting was raised from an initial value of 8.4–10.6% and Pt loading was reduced by approximately 1000-fold (from 0.07 to 7.22 × 10−5 g cm−2). Thus, present high efficient hydrogen electrode preparation method utilized less Pt material than the conventional Pt electrode and the efficiency was increased by 26%. This can be scaled up for becoming a volume production low-cost method.
URI
http://pubs.kist.re.kr/handle/201004/37706
ISSN
0360-3199
Appears in Collections:
KIST Publication > Article
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