Fabrication of In2O3/ZnO hetero-epitaxial-junctions with enhanced PEC performances. (December 2017)
- Record Type:
- Journal Article
- Title:
- Fabrication of In2O3/ZnO hetero-epitaxial-junctions with enhanced PEC performances. (December 2017)
- Main Title:
- Fabrication of In2O3/ZnO hetero-epitaxial-junctions with enhanced PEC performances
- Authors:
- Zhang, Bo
Wang, Zeyan
Zhang, Xiaoyang
Qin, Xiaoyan
Wang, Peng
Liu, Yuanyuan
Li, Mengmeng
Dai, Ying
Li, Yingjie
Huang, Baibiao - Abstract:
- Abstract: In2 O3 /ZnO hetero-epitaxial-junction photoanodes were successfully synthesized and applied for the photoelectrochemical splitting of water. With the assistance of In2 O3, the light absorption of In2 O3 /ZnO heterojunctions can effectively expand to visible light absorption region. Due to the epitaxial relationship between (10-10) ZnO and {-211} In2 O3 planes, the staggered band alignments between In2 O3 and ZnO can produce a built in electric field at the heterojunction interface with a high quality, which can promote the charge separation and lower the charge recombination under light irradiation. Moreover, low index crystal facets, such as {001} and {111} facets, with lower surface energies can be formed spontaneously in In2 O3 nanoparticles due to the surface energy conservation. And the presence of In2 O3 {001} facets can effectively lower the onset potential and facilitate the water oxidation. With the synergistic effects mentioned above, In2 O3 /ZnO-6 exhibit highest photocurrent density of 2.2 mA cm −2 at 0.6 V vs Ag/AgCl and IPCE value of 88.62% at 0.25 V vs Ag/AgCl (370 nm), which is 2.82 and 4.4 times as high as that of ZnO NRs and In2 O3 photoanodes, respectively. Highlights: In2 O3 /ZnO hetero-epitaxial-junction photoanodes were successfully synthesized. Staggered band alignment of heterojunction facilitate the charge separation. The epitaxial relationship between {100} ZnO and {-211} In2 O3 planes. The In2 O3 {100} facets lower the overpotential forAbstract: In2 O3 /ZnO hetero-epitaxial-junction photoanodes were successfully synthesized and applied for the photoelectrochemical splitting of water. With the assistance of In2 O3, the light absorption of In2 O3 /ZnO heterojunctions can effectively expand to visible light absorption region. Due to the epitaxial relationship between (10-10) ZnO and {-211} In2 O3 planes, the staggered band alignments between In2 O3 and ZnO can produce a built in electric field at the heterojunction interface with a high quality, which can promote the charge separation and lower the charge recombination under light irradiation. Moreover, low index crystal facets, such as {001} and {111} facets, with lower surface energies can be formed spontaneously in In2 O3 nanoparticles due to the surface energy conservation. And the presence of In2 O3 {001} facets can effectively lower the onset potential and facilitate the water oxidation. With the synergistic effects mentioned above, In2 O3 /ZnO-6 exhibit highest photocurrent density of 2.2 mA cm −2 at 0.6 V vs Ag/AgCl and IPCE value of 88.62% at 0.25 V vs Ag/AgCl (370 nm), which is 2.82 and 4.4 times as high as that of ZnO NRs and In2 O3 photoanodes, respectively. Highlights: In2 O3 /ZnO hetero-epitaxial-junction photoanodes were successfully synthesized. Staggered band alignment of heterojunction facilitate the charge separation. The epitaxial relationship between {100} ZnO and {-211} In2 O3 planes. The In2 O3 {100} facets lower the overpotential for O2 evolution. The In2 O3 /ZnO photoelectrode exhibits visible light photoresponse. … (more)
- Is Part Of:
- Materials today energy. Volume 6(2017)
- Journal:
- Materials today energy
- Issue:
- Volume 6(2017)
- Issue Display:
- Volume 6, Issue 2017 (2017)
- Year:
- 2017
- Volume:
- 6
- Issue:
- 2017
- Issue Sort Value:
- 2017-0006-2017-0000
- Page Start:
- 65
- Page End:
- 71
- Publication Date:
- 2017-12
- Subjects:
- In2O3/ZnO hetero-epitaxial-junction -- Visible light absorption -- Charge separation -- In2O3 {100} facets -- Photoelectrochemical water splitting
Energy development -- Periodicals
Energy industries -- Periodicals
Power resources -- Periodicals
Energy policy -- Periodicals
Energy development
Energy industries
Energy policy
Power resources
Electronic journals
Periodicals
621.042 - Journal URLs:
- http://www.sciencedirect.com/science/journal/24686069 ↗
http://www.sciencedirect.com/ ↗ - DOI:
- 10.1016/j.mtener.2017.07.011 ↗
- Languages:
- English
- ISSNs:
- 2468-6069
- Deposit Type:
- Legaldeposit
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- Available online (eLD content is only available in our Reading Rooms) ↗
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