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Visible light driven hydrogen production from a photo-active cathode based on a molecular catalyst and organic dye-sensitized p-type nanostructured NiO
KTH, Skolan för kemivetenskap (CHE), Kemi, Organisk kemi.
KTH, Skolan för kemivetenskap (CHE), Kemi, Organisk kemi.ORCID-id: 0000-0003-1662-5817
Visa övriga samt affilieringar
2012 (Engelska)Ingår i: Chemical Communications, ISSN 1359-7345, E-ISSN 1364-548X, Vol. 48, nr 7, s. 988-990Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A molecular device with a photocathode for hydrogen generation has been successfully demonstrated, based on an earth abundant and inexpensive p-type semiconductor NiO, an organic dye P1 and a cobalt catalyst Co1.

Ort, förlag, år, upplaga, sidor
2012. Vol. 48, nr 7, s. 988-990
Nationell ämneskategori
Organisk kemi
Identifikatorer
URN: urn:nbn:se:kth:diva-90643DOI: 10.1039/c2cc16101jISI: 000299649900013Scopus ID: 2-s2.0-84855394496OAI: oai:DiVA.org:kth-90643DiVA, id: diva2:510247
Anmärkning
QC 20120315Tillgänglig från: 2012-03-15 Skapad: 2012-02-27 Senast uppdaterad: 2017-12-07Bibliografiskt granskad
Ingår i avhandling
1. Functional Photo-electrochemical Devices for Solar Cellsand Solar Fuels Based on Molecular Components
Öppna denna publikation i ny flik eller fönster >>Functional Photo-electrochemical Devices for Solar Cellsand Solar Fuels Based on Molecular Components
2012 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

This thesis concerns the development and the study of molecular functional photo-electrochemical cells (PEC) for solar cells and solar fuels.

The first chapter gives a general introduction about photosynthesis, dye-sensitized solar cell and photo-electrochemical device for water splitting.

The second chapter describes a TiO2-Co-catalyst electrode manufactured by a direct photo-deposition method. The electrode showed activity for electrochemical water oxidation in an electrochemical device.

In the third chapter, a photo-electrochemical cell (PEC) with two-electrodes for visible light driven water splitting has been successfully demonstrated. One electrode was a photo-anode, which assembled a ruthenium water oxidation catalyst (complex 1) into a dye-sensitized porous nanostructured TiO2 electrode by employing a cation-exchange membrane (Nafion). The other electrode was platinum which was used as a passive cathode for proton reduction.

In the fourth chapter, an earth abundant metal complex with an anchoring group (cobalt complex 2) was synthesized and investigated as water oxidation catalyst. This complex was further applied into a photo-anode in a PEC. The photo-anode was assembled by co-sensitization of complex 2 to a dye-sensitized porous nanostructured TiO2 electrode. The PEC device gave ca. 250 υA/cm2 photo-current and 7.2 % IPCE without applying any bias voltage, which is much higher than the reported results in the sample type of PEC. Meanwhile, we have shown that the catalytic effect is not from free cobalt ions, CoOx film or nanoparticles formed in situ by using complex 2 in the device.

The last two chapters describe an optimization of the NiO films prepared in two steps rather than one step film and applied in p-type DSSCs. This optimized film could adsorb more dye (P1), leading to a significant light harvesting efficiency (LHE) and IPCE in DSSCs. We further combined this P1 sensitized photo-cathode with a hydrogen evolution catalyst (complex 3) and applied this photo-cathode into a PEC for visible light hydrogen evolution.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2012. s. 71
Serie
Trita-CHE-Report, ISSN 1654-1081 ; 2012:51
Nyckelord
artificial photosynthesis, dye sensitized solar cell, hydrogen generation catalyst, nickel oxide (NiO), titanium dioxide (TiO2), water oxidation catalyst, water splitting
Nationell ämneskategori
Annan kemiteknik
Identifikatorer
urn:nbn:se:kth:diva-103623 (URN)
Disputation
2012-11-09, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Anmärkning

QC 20121017

Tillgänglig från: 2012-10-17 Skapad: 2012-10-16 Senast uppdaterad: 2012-10-17Bibliografiskt granskad

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