Xu You, Yin Xuguang, Huang Yi, Du Pingwu, Zhang Bin
Department of Chemistry, School of Science, Tianjin University and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072 (China).
Chemistry. 2015 Mar 16;21(12):4571-5. doi: 10.1002/chem.201406642. Epub 2015 Feb 6.
The production of clean and renewable hydrogen through water splitting by using solar energy has received much attention due to the increasing global energy demand. We report an economic and artificial photosynthetic system free of noble metals, consisting of ultrathin CdS nanosheets as a photosensitizer and nickel-based complex as a molecular catalyst. Emission quenching and flash photolysis studies reveal that this hybrid system allows for effective electron transfer from the excited CdS nanosheets to the nickel-based complex to generate reduced intermediate species for efficient hydrogen evolution. Notably, the unique morphological and structural features of the ultrathin CdS nanosheets contribute to the highly efficient photocatalytic performance. As a consequence, the resulting system shows exceptional activity and stability for photocatalytic hydrogen evolution in aqueous solution with a turnover number (TON) of about 28,000 versus catalyst and a lifetime of over 90 h under visible light irradiation.
由于全球能源需求不断增长，利用太阳能通过水分解生产清洁可再生氢气受到了广泛关注。我们报道了一种不含贵金属的经济且人工光合系统，该系统由超薄CdS纳米片作为光敏剂和镍基配合物作为分子催化剂组成。发射猝灭和闪光光解研究表明，这种混合系统能够实现从激发的CdS纳米片到镍基配合物的有效电子转移，从而产生还原中间物种以实现高效析氢。值得注意的是，超薄CdS纳米片独特的形态和结构特征有助于实现高效的光催化性能。因此，所得系统在水溶液中对光催化析氢表现出卓越的活性和稳定性，相对于催化剂的周转数（TON）约为28,000，在可见光照射下寿命超过90小时。
