Lai Hua, Liu Xing, Zeng Fanyan, Peng Gang, Li Junhua, Yi Zhengji
College of Chemistry Materials, Hengyang Normal University, Hengyang 421008, China.
Key Laboratory of Functional Metal-Organic Compounds of Hunan Province & Key Laboratory of Functional Organometallic Materials of College of Hunan Province, Hengyang Normal University, Hengyang 421008, China.
ACS Omega. 2020 Jan 23;5(4):2027-2033. doi: 10.1021/acsomega.9b04135. eCollection 2020 Feb 4.
Donor-π bridge-acceptor (D-π-A) organic dyes, well studied in dye-sensitized solar cells (DSSCs), are found to possess great potential in light-inducing hydrogen evolution due to their distinguished light-harvesting ability and suitable electron energy level. In this work, multicarbazole-based organic dyes (2C, 3C, 4C) were used as photosensitizers of Pt/TiO for photocatalytic hydrogen evolution (PHE) from water under visible light irradiation. 3C-Pt/TiO shows the best photocatalytic activity among the three dye-sensitized photocatalysts, with a hydrogen evolution rate of 24.7 μmol h and a turnover number of 247 h. The activity of 3C-Pt/TiO declines significantly after 3 h irradiation. The deactivation was caused by the partial degradation of the electron acceptor, cyanoacrylate moiety, during the photocatalytic process, which was evidenced by UV-vis, Fourier transform infrared spectra (FT-IR), NMR, and mass spectra. This work is expected to contribute toward the understanding of stability issues of organic dyes and the development of more efficient and steady dyes for hydrogen evolution from water splitting.
供体-π桥-受体（D-π-A）有机染料在染料敏化太阳能电池（DSSC）中得到了深入研究，由于其卓越的光捕获能力和合适的电子能级，在光诱导析氢方面具有巨大潜力。在这项工作中，基于多咔唑的有机染料（2C、3C、4C）被用作Pt/TiO的光敏剂，用于在可见光照射下从水中进行光催化析氢（PHE）。3C-Pt/TiO在三种染料敏化光催化剂中表现出最佳的光催化活性，析氢速率为24.7 μmol/h，周转数为247 h。照射3小时后，3C-Pt/TiO的活性显著下降。失活是由光催化过程中电子受体氰基丙烯酸酯部分的部分降解引起的，这通过紫外可见光谱、傅里叶变换红外光谱（FT-IR）、核磁共振和质谱得到了证实。这项工作有望有助于理解有机染料的稳定性问题，并开发出更高效、稳定的用于水分解析氢的染料。
