Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
A conductive ZnO-ZnGaON nanowire-array-on-a film photoanode for stable and efficient sunlight water splitting
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
Visa övriga samt affilieringar
2014 (Engelska)Ingår i: Energy & Environmental Science, ISSN 1754-5692, E-ISSN 1754-5706, Vol. 7, nr 5, s. 1693-1699Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We report highly stable and efficient sunlight water splitting on a ZnO-ZnGaON nanowire-array-on-a-film photoanode without the assistance of any co-catalyst. The single crystalline ZnO-ZnGaON nanowirearray- on-a-film photoanode was synthesized via a high-temperature vapor-phase diffusion reaction of gallium (Ga) and nitrogen (N) on a single crystal domain ZnO nanowire-array-on-a-film structure. The synthesized ZnO-ZnGaON photoanode offers visible light absorption through N incorporation, improved electrical conductivity via Ga incorporation, and structural advantages with the high-aspect-ratio nanowire array. Compared to the chemically unstable ZnO nanowire photoanode, the ZnO-ZnGaON nanowire photoanode significantly improves the anti-photocorrosive ability for water splitting. A highly stable photocurrent density of similar to 1.5 mA cm(-2) is obtained with the ZnO-ZnGaON nanowire photoanode at an applied bias of 0.8 V-RHE under continuous sunlight illumination over five hours without noticeable degradation.

Ort, förlag, år, upplaga, sidor
2014. Vol. 7, nr 5, s. 1693-1699
Nationell ämneskategori
Kemi
Forskningsämne
oorganisk kemi
Identifikatorer
URN: urn:nbn:se:su:diva-104130DOI: 10.1039/c3ee43806fISI: 000335013700018OAI: oai:DiVA.org:su-104130DiVA, id: diva2:721170
Anmärkning

AuthorCount:5;

Tillgänglig från: 2014-06-03 Skapad: 2014-06-03 Senast uppdaterad: 2017-12-05Bibliografiskt granskad
Ingår i avhandling
1. Structural study of nano-structured materials: electron crystallography approaches
Öppna denna publikation i ny flik eller fönster >>Structural study of nano-structured materials: electron crystallography approaches
2016 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

The structural analysis serves as a bridge to link the structure of materials to their properties. Revealing the structure details allows a better understanding on the growth mechanisms and properties of materials, and a further designed synthesis of functional materials. The widely used methods based on X-ray diffraction have certain limitations for the structural analysis when crystals are small, poorly crystallized or contain many defects. As electrons interact strongly with matter and can be focused by electromagnetic lenses to form an image, electron crystallography (EC) approaches become prime candidates for the structural analysis of a wide range of materials that cannot be done using X-rays, particularly nanomaterials with poor crystallinity.

Three-dimensional electron diffraction tomography (3D EDT) is a recently developed method to automatically collect 3D electron diffraction data. By combining mechanical specimen tilt and electronic e-beam tilt, a large volume of reciprocal space can be swept at a fine step size to ensure the completeness and accuracy of the diffraction data with respect to both position and intensity. Effects of the dynamical scattering are enormously reduced as most of the patterns are collected at conditions off the zone axes. In this thesis, 3D EDT has been used for unit cell determination (COF-505), phase identifications and structure solutions (ZnO, Ba-Ta3N5, Zn-Sc, and V4O9), and the study of layer stacking faults (ETS-10 and SAPO-34 nanosheets).

High-resolution transmission electron microscope (HRTEM) imaging shows its particular advantages over diffraction by allowing observations of crystal structure projections and the 3D potential map reconstruction. HRTEM imaging has been used to visualize fine structures of different materials (hierarchical zeolites, ETS-10, and SAPO-34). Reconstructed 3D potential maps have been used to locate the positions of metal ions in a woven framework (COF-505) and elucidate the pore shape and connectivity in a silica mesoporous crystal.

The last part of this thesis explores the combination with X-ray crystallography to obtain more structure details.

Ort, förlag, år, upplaga, sidor
Stockholm: Department of Materials and Environmental Chemistry (MMK), Stockholm University, 2016. s. 101
Nyckelord
structural analysis, electron crystallography, 3D EDT, HRTEM imaging, defects
Nationell ämneskategori
Oorganisk kemi
Forskningsämne
oorganisk kemi
Identifikatorer
urn:nbn:se:su:diva-129233 (URN)978-91-7649-425-7 (ISBN)
Disputation
2016-06-08, Magnéli Hall, Arrhenius Laboratory, Svante arrhenius väg 16 B, Stockholm, 13:00 (Engelska)
Opponent
Handledare
Forskningsfinansiär
Vetenskapsrådet, 1486801
Tillgänglig från: 2016-05-16 Skapad: 2016-04-18 Senast uppdaterad: 2017-02-23Bibliografiskt granskad

Open Access i DiVA

Fulltext saknas i DiVA

Övriga länkar

Förlagets fulltext

Sök vidare i DiVA

Av författaren/redaktören
Ma, YanhangOleynikov, Peter
Av organisationen
Institutionen för material- och miljökemi (MMK)
I samma tidskrift
Energy & Environmental Science
Kemi

Sök vidare utanför DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetricpoäng

doi
urn-nbn
Totalt: 151 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf