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A Novel Single-Atom Electrocatalyst Ti-1/rGO for Efficient Cathodic Reduction in Hybrid Photovoltaics

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Indexed by:Journal Papers

First Author:Liang, Suxia

Correspondence Author:Zhang, Heming,haoce,shiyantao,Zhu, Chao,Zhang, Naitian,Zhang, Shuo,Qiao, Botao,Liu, Hua,Liu, Xiaoyan,Liu, Zheng,songxuedan

Date of Publication:2021-01-10

Journal:ADVANCED MATERIALS

Volume:32

Issue:19

Page Number:e2000478

ISSN No.:0935-9648

Key Words:cathode reaction; dye-sensitized solar cells; reduced graphene oxide; single-atom catalysts; titanium

Abstract: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.

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