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Journal ArticleDOI

Photosensitized Electrolytic Oxidation of Iodide Ions on Cadmium Sulfide Single Crystal Electrode

01 Jan 1971-Bulletin of the Chemical Society of Japan (The Chemical Society of Japan 公益社団法人 日本化学会)-Vol. 44, Iss: 1, pp 304-304
About: This article is published in Bulletin of the Chemical Society of Japan.The article was published on 1971-01-01 and is currently open access. It has received 45 citations till now. The article focuses on the topics: Cadmium sulfide & Iodide.
Citations
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Journal ArticleDOI
07 Jul 1972-Nature
TL;DR: Water photolysis is investigated by exploiting the fact that water is transparent to visible light and cannot be decomposed directly, but only by radiation with wavelengths shorter than 190 nm.
Abstract: ALTHOUGH the possibility of water photolysis has been investigated by many workers, a useful method has only now been developed. Because water is transparent to visible light it cannot be decomposed directly, but only by radiation with wavelengths shorter than 190 nm (ref. 1).

27,819 citations

Journal ArticleDOI
TL;DR: Cobalt pyrite (cobalt disulfide, CoS2) thin film on glass is reported as a robust, high-performance, low-cost, earth-abundant counter electrode for liquid-junction quantum dot-sensitized solar cells (QDSSCs) that employ the aqueous sulfide/polysulfide redox electrolyte as the hole-transporting medium.
Abstract: We report a cobalt pyrite (cobalt disulfide, CoS2) thin film on glass as a robust, high-performance, low-cost, earth-abundant counter electrode for liquid-junction quantum dot-sensitized solar cells (QDSSCs) that employ the aqueous sulfide/polysulfide (S2–/Sn2–) redox electrolyte as the hole-transporting medium. The metallic CoS2 thin film electrode is prepared via thermal sulfidation of a cobalt film deposited on glass and has been characterized by powder X-ray diffraction and electron microscopy. Using the CoS2 counter electrode, CdS/CdSe-sensitized QDSSCs display improved short-circuit photocurrent density and fill factor, achieving solar light-to-electricity conversion efficiencies as high as 4.16%, with an average efficiency improvement of 54 (±14)% over equivalent devices assembled with a traditional platinum counter electrode. Electrochemical measurements verify that CoS2 shows high electrocatalytic activity toward polysulfide reduction, rationalizing the improved QDSSC performance. CoS2 is also le...

194 citations

Journal ArticleDOI
TL;DR: In this article, the state-of-the-art as regards the use of various semiconductors as photoelectrodes in PEC systems and the stabilization of low band-gap semiconductor by using redox couples are reviewed.

154 citations

References
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Journal ArticleDOI
TL;DR: In this paper, an experimental study has been made of photovoltaic effects which occur at semiconductor-electrolyte interfaces, where single crystal specimens of CdS and several other compounds were used.
Abstract: An experimental study has been made of photovoltaic effects which occur at semiconductor‐electrolyte interfaces. Single crystal specimens of CdS and several other compounds were used. It was found that in a number of cases the photovoltaic effect results from a chemical reaction of the electrode materials. In such cases the observations may be explained by a simple mechanism which relates the sign of the photo‐emf to the conductivity type of the semiconductor and to the chemical reaction which is occurring. The reaction may be predicted using readily available thermodynamic data. A different process occurs when the electrode material is GaAs. It acts as an inert electrode which exchanges electrons with an oxidation‐reduction couple in the solution.

302 citations

Journal ArticleDOI
TL;DR: In contrast to metals, the average free energy of electrons can be changed in semiconductors to a great extent by illumination Especially the concentration of minority electronic carriers can differ by orders of magnitude from the equilibrium value.
Abstract: In contrast to metals, the average free energy of electrons can be changed in semiconductors to a great extent by illumination Especially the concentration of minority electronic carriers can differ by orders of magnitude from the equilibrium value This has two major effects on electrode processes: (a) change of charge distribution and potential drops in the space charge layer; and (b) variation of the rate of electrode reaction in which minority carriers are involved Some examples are given for those effects at various semiconductors

267 citations

Journal ArticleDOI
TL;DR: In this article, the authors describe the TiO2(ルチル) system and show that it can be used to simulate the behavior of a person in a video game.
Abstract: n型半導体であるTiO2(ルチル)を電極に用いて分極挙動を測定した。光照射しない時にはカソード分極下で水素発生が起こるが,アノード分極下ではほとんど電解電流が流れず顕著な電解整流作用を示した。TiO2電極表面に光照射すると,カソード電流は変化しないがアノード電流は著しく増加する。この電流はTiO2のバンドギァプ3.0eVに相当する415mμ以下の波長の光によってのみ生じ,また電流の大きさは光強度に比例する。立ち上り電位はpH4.7では-0.5V(vs.SCE)である。この電解酸化反応は従来n型半導体で報告されている電極自身の溶解反応ではなくて,水の電解による酸素の発生であることを確かめた。このことはいわゆる平衡電位より約1V以上も卑な電位で酸素発生がおこる“光増感電解酸化”であり,光のエネルギーを半導体が吸収したためである。またI-のI2への酸化も平衡電位より卑で起こることを確かめた。機構については半導体のバンドモデルから考察した。

136 citations