Panchromatic Sensitization with ZnII Porphyrin-Based Photosensitizers for Light-Driven Hydrogen Production
Ho, PY; Mark, MF; Wang, Y; Yiu, SC; Yu, WH; Ho, CL; McCamant, DW; Eisenberg, R; Huang, SP / CHEMSUSCHEM (2018) / DOI: https://doi.org/10.1002/cssc.201801255
概要 / Overview
フェムト秒過渡吸収（TA）でYD2系の励起子ダイナミクス（GSB/SE/ESA）とTiO2界面の注入・再結合を解析しました。
ここがポイント / Key Points
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- GSB/SE/ESAの分離
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- TiO2界面の注入・再結合
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- 寿命・スペクトル重なりに基づく設計指針
設計と機能 / Design & Function
- 設計：試料：YD2系／セットアップ：fsポンプ–プローブ（白色プローブ）
- 機能：注入・緩和・再結合の時定数を抽出し、チャネル間の寄与を分離
- 特長：デバイス指向の実測ダイナミクス
用語ミニ解説 / Mini Glossary
- GSB：基底状態ブリーチ：吸収の減少
- ESA：励起状態吸収：吸収の増加
参考文献 / References
- CHEMSUSCHEM (2018). DOI: https://doi.org/10.1002/cssc.201801255
Panchromatic Sensitization with ZnII Porphyrin-Based Photosensitizers for Light-Driven Hydrogen Production
Ho, PY; Mark, MF; Wang, Y; Yiu, SC; Yu, WH; Ho, CL; McCamant, DW; Eisenberg, R; Huang, SP / CHEMSUSCHEM (2018) / DOI: https://doi.org/10.1002/cssc.201801255
Overview
Three molecular photosensitizers (PSs) with carboxylic acid anchors for attachment to platinized titanium dioxide nanoparticles were studied for light-driven hydrogen production from a fully aqueous medium with ascorbic acid (AA) as the sacrificial electron donor. Two zinc(II) porphyrin (ZnP)-based PSs were used to examine the effect of panchromatic sensitization on the photocatalytic H-2 generation. A dyad molecular design was used to construct a difluoro boron-dipyrromethene (bodipy)-conjugated ZnP PS (ZnP-dyad), whereas the other one featured an electron-donating diarylamino moiety (YD2-o-C8). To probe the use of the ZnP scaffold in this particular energy conversion process, an organic PS
Key Points
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- GSB/SE/ESA deconvolution
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- Interfacial injection/recombination at TiO2
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- Design guided by lifetimes and spectral overlap
Design & Function
- Design: Sample: YD2-based; Setup: fs pump–probe (white-light)
- Function: Extracted time constants for injection, relaxation, recombination; separated channel contributions
- Feature: Device-relevant excited-state dynamics
Mini Glossary
- GSB — Ground-State Bleach
- ESA — Excited-State Absorption
References
- CHEMSUSCHEM (2018). DOI: https://doi.org/10.1002/cssc.201801255
