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Hierarchically self-assembled ZnO architectures: Establishing light trapping networks for effective photoelectrochemical water splitting

Title
Hierarchically self-assembled ZnO architectures: Establishing light trapping networks for effective photoelectrochemical water splitting
Authors
Hou T.-F.Boppella R.Shanmugasundaram A.Kim D.H.Lee D.-W.
Ewha Authors
김동하
SCOPUS Author ID
김동하scopus
Issue Date
2017
Journal Title
International Journal of Hydrogen Energy
ISSN
0360-3199JCR Link
Citation
vol. 42, no. 22, pp. 15126 - 15139
Keywords
Hydrothermal synthesisLight trappingPhotoelectrochemical water splittingZnO hierarchical architectures
Publisher
Elsevier Ltd
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Here we develop photoanodes based on hierarchical zinc oxide (ZnO) nanostructures such as vertically aligned nanorods (NR), nanorods interconnected by thin nanosheets (NR@TN) and nanorods interconnected by dense nanosheets (NR@DN). The morphological variations were successfully controlled by secondary growth time and the plausible formation mechanisms of these hierarchical ZnO architectures were explained based on the experiment analysis. Under simulated light illumination (AM 1.5, 100 mW cm−2), NR@TN produced a photocurrent density of 0.62 mA/cm2 at 1.23 V vs. reversible hydrogen electrode (vs. RHE). Importantly, 35% enrichment in photoconversion efficiency was observed for NR@TN at much lower bias potential (0.77 V vs. RHE) compared with NR (0.135%) and NR@DN (0.13% at 0.82 V vs. RHE). Key to the improved performance is believed to be synergetic effects of excellent light-trapping characteristics and the large surface-to-volume ratios due to the nanosheet structures. The nanorod connected with thin nanosheet structures improved the efficiency by means of improved charge transfer across the nanostructure/electrolyte interfaces, and efficient charge transport within the material. We believe that the hierarchical ZnO structures can be used in conjunction with doping and/or sensitization to promote the photoelectrochemical (PEC) performance. Further, the ZnO nanorod interconnected with nanosheets morphology presented in this article is extendable to other metal oxide semiconductors to establish a universal protocol for the development of high performance photoanodes in the field of PEC water splitting. © 2017 Hydrogen Energy Publications LLC
DOI
10.1016/j.ijhydene.2017.04.121
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자연과학대학 > 화학·나노과학전공 > Journal papers
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