BiVO4 - 0.2%の太陽エネルギー変換効率を持つ液体結合光電池
Sahar Daemi1, Samhita Kaushik2, Soumik Das2
1Department of Chemistry, University of California, Davis, California 95616, United States.
Journal of the American Chemical Society
|November 15, 2023
まとめ
ビスマスバナダート (BiVO4) フォトアノードは,トリオイド/ヨイド電解質で光伏効果を示し,0.55Vの光伏電圧を達成します. Moドーピングは伝導性を高めますが,これらの新しいBiVO4液体の光電池では光電圧を下げます.
科学分野:
- 材料科学
- 電気化学
- 太陽光発電
背景:
- ビスマスバナデート (BiVO4) は,水の酸化のための重要な光電極材料です.
- トライオジド/ヨオジド酸化還元カップルの光電化学的行動は十分に理解されていない.
- これらのインターフェースを理解することは,効率的な光電化学装置の開発に不可欠です.
研究 の 目的:
- トライオジド/イオジド・レドックスカップルによるBiVO4の光電化学を調査する.
- BiVO4ベースの液体光電池を製造し分析する.
- モリブデン (Mo) ドーピングがデバイスの性能に与える影響を評価する.
主な方法:
- オープン・サーキット・ポテンシャル測定
- 光電気化学スキャナー
- 液体表面光電スペクトロシー (SPS)
- FTO/BiVO4/KI (I2) aq/Ptサンドイッチセルの製造について
主要な成果:
- BiVO4/トライオイド/ヨオイドのインターフェースは,0.55Vまでの光電力を生成します.
- 構成された電池は,0.22%のエネルギー変換効率,0.32Vの光電圧,および1.8mAcm-2の光電流を達成しました.
- Moドーピングは導電性とインシデント光子対電流効率を向上させましたが,欠陥とショットキーの交差点のために光電圧を低下させました.
結論:
- この研究は,最初のBiVO4液体光電池を提示し,その動作原理と限界を明らかにします.
- ヨウ化物への穴の移転は迅速で,水の酸化を抑制します.
- 光電圧の損失は,帯域の縁の不整合,電子の逆転,およびMo誘発の欠陥から生じる.
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