熱電-光電化学 濃縮太陽光照射による水分裂
Chanon Pornrungroj1, Virgil Andrei1, Erwin Reisner1
1Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom.
Journal of the American Chemical Society
|June 13, 2023
まとめ
光電化学炉に組み込まれた熱電学モジュールは,廃棄熱を電圧に変換し,太陽光燃料の無助生産を可能にします. このアプローチは,特に集中光下での効率を高め,循環型経済を実現します.
科学分野:
- 材料科学
- 再生可能エネルギー
- 電気化学
背景:
- 光電化学 (PEC) 装置は,循環型経済における太陽光燃料の生産に不可欠です.
- 現在のPEC技術は,熱化の損失と低エネルギーフォトンの非効率的な使用のために制限に直面しています.
- 太陽エネルギー変換で発生する廃棄熱は,しばしば未使用です.
研究 の 目的:
- 熱電モジュールをPEC原子炉に統合して廃棄熱を活用することを調査する.
- 熱エネルギーを電気的可能性に変換することで太陽光燃料の生産効率を高める.
- 集中光の下での無助の水分裂と改善された光電流を実証する.
主な方法:
- 半導体フォトアノード (BiVO4,ペロブスキート-BiVO4,ヘマタイト,Fe2O3) との熱電モジュールの統合
- 光電化学炉は,濃縮光照射 (2〜5日) の下で動作する.
- 装置の性能を評価するために光電流と電圧の生成を測定する.
主要な成果:
- 熱電元素と結合したBiVO4光アノードを使用して,2つの太陽照射下で無助の水分裂を達成した.
- 5太陽でペロブスキート-BiVO4タンデムシステムの1.7倍の光流強化を実証した.
- 光濃度のない装置と比較して,熱電気ペロブスキートFe2O3システムで29.7倍増加が観察されました.
結論:
- 熱電モジュールを統合することで,廃棄熱を利用してPECデバイスの性能を向上させるための普遍的な戦略を提供します.
- このアプローチは,特に集中光下での太陽光燃料の生産を容易にし,原子炉のサイズとコストを削減します.
- 熱管理戦略は,効率的で費用対効果の高い太陽光発電を推進する大きな可能性を示しています.
さらに関連する動画
12:47Preparation and Use of Photocatalytically Active Segmented Ag|ZnO and Coaxial TiO2-Ag Nanowires Made by Templated Electrodeposition
Published on: May 2, 2014
21.8K
10:21Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions
Published on: October 5, 2019
8.4K
関連する概念動画
The Z-Scheme of Electron Transport in Photosynthesis
10.3K
The light reactions of photosynthesis assume a linear flow of electrons from water to NADP+. During this process, light energy drives the splitting of water molecules to produce oxygen. However, oxidation of water molecules is a thermodynamically unfavorable reaction and requires a strong oxidizing agent. This is accomplished by the first product of light reactions: oxidized P680 (or P680+), the most powerful oxidizing agent known in biology. The oxidized P680 that acquires an electron from the...
10.3K
Thermal and Photochemical Electrocyclic Reactions: Overview
2.4K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.4K
Photosystem I
63.2K
Although structurally similar to photosystem II (PSII), photosystem I (PSI) is has a different electron supplier and electron acceptor.
Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...
Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...
63.2K
Photosystem II
71.4K
The multi-protein complex photosystem II (PS II) harvests photons and transfers their energy through its bound pigments to its reaction center, and ultimately to photosystem I (PSI) through the electron transport chain. The pigments responsible for caputirng the light energy in photosystems include chlorophyll a, chlorophyll b, and carotenoids.
The pigment molecules are arranged across two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment...
The pigment molecules are arranged across two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment...
71.4K
Oxygenic Photosynthesis
47
Oxygenic photosynthesis is a fundamental process in which light energy is harnessed to drive the oxidation of water, leading to the production of molecular oxygen (O₂), adenosine triphosphate (ATP), and nicotinamide adenine dinucleotide phosphate (NADPH). This process is essential for sustaining aerobic life on Earth and is primarily carried out by cyanobacteria, algae, and plants. The core of oxygenic photosynthesis lies in the thylakoid membranes, where chlorophyll pigments facilitate...
47
P-N junction
590
A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
590
