论文名称：A Novel Single-Atom Electrocatalyst Ti-1/rGO for Efficient Cathodic Reduction in Hybrid Photovoltaics
论文类型：期刊论文
发表刊物：ADVANCED MATERIALS
卷号：32
期号：19
页面范围：e2000478
ISSN号：0935-9648
关键字：cathode reaction; dye-sensitized solar cells; reduced graphene oxide; single-atom catalysts; titanium
摘要：Single-atom catalysts (SACs) are a frontier research topic in the catalysis community. Carbon materials decorated with atomically dispersed Ti are theoretically predicted with many attractive applications. However, such material has not been achieved so far. Herein, a Ti-based SAC, consisting of isolated Ti anchored by oxygen atoms on reduced graphene oxide (rGO) (termed as Ti-1/rGO), is successfully synthesized. The structure of Ti-1/rGO is characterized by high-angle annular dark-field scanning transmission electron microscopy and X-ray absorption fine structure spectroscopy, being determined to have a five coordinated local structure TiO5. When serving as non-Pt cathode material in dye-sensitized solar cells (DSCs), Ti-1/rGO exhibits high electrocatalytic activity toward the tri-iodide reduction reaction. The power conversion efficiency of DSCs based on Ti-1/rGO is comparable to that using conventional Pt cathode. The unique structure of TiO5 moieties and the crucial role of atomically dispersed Ti in Ti-1/rGO are well understood by experiments and density functional theory calculations. This emerging material shows potential applications in energy conversion and storage devices.
发表时间：2021-01-10