Ultrathin CoOOH Oxides Nanosheets Realizing Efficient Photocatalytic Hydrogen Evolution

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• 作者：Shi He ; Yuanyuan Huang ; Junheng Huang ; Wei Liu ; Tao Yao ; Shan Jiang ; Fumin Tang ; Jinkun Liu ; Fengchun Hu ; Zhiyun Pan ; Qinghua Liu
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：November 25, 2015
• 年：2015
• 卷：119
• 期：47
• 页码：26362-26366
• 全文大小：349K
• ISSN：1932-7455

文摘

Producing H₂ by means of direct photocatalytic water splitting using suspension system is highly desired in efficiently transforming solar energy to chemical energy. Here, using an ultrathin 尾-CoOOH nanosheet as photocatalyst suspended in aqueous Na₂SO₃ solution, we realize highly efficient and stable photocatalytic hydrogen evolution under visible light irradiation. The as-prepared ultrathin 尾-CoOOH nanosheets suspension can directly photocatalyze hydrogen evolution in a high rate of 1200 渭mol/g/h and large quantum efficiencies of 10.7% at 380 nm, 6.9% at 420 nm, and 2.3% at 450 nm. X-ray photoelectron and X-ray absorption measurements reveal that the excellent hydrogen evolution activity of the 尾-CoOOH nanosheet is attributed to the surface low-coordinated Co catalytic site, which results in a strong hybridization of Co 3d states with the S p states of SO₃²⁺, and facilitates the electron transfer to reduce H⁺. The results may be helpful for designing and understanding two-dimensional oxyhydroxide-based photocatalyst for hydrogen production.