Volume 20, Issue 18 2307965
Research Article

Interfacial Engineering of Fluorinated TiO2 Nanosheets with Abundant Oxygen Vacancies for Boosting the Hydrogen Storage Performance of MgH2

Qingyun Shi

Qingyun Shi

State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022 China

School of Applied Chemistry and Engineering, University of Science and Technology of China (USTC), Hefei, 230026 China

Search for more papers by this author
Yuxing Gao

Yuxing Gao

State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022 China

School of Applied Chemistry and Engineering, University of Science and Technology of China (USTC), Hefei, 230026 China

Search for more papers by this author
Shaolei Zhao

Shaolei Zhao

State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022 China

School of Applied Chemistry and Engineering, University of Science and Technology of China (USTC), Hefei, 230026 China

Search for more papers by this author
Chunmin Zhang

Chunmin Zhang

State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022 China

School of Applied Chemistry and Engineering, University of Science and Technology of China (USTC), Hefei, 230026 China

Search for more papers by this author
Cong Liu

Cong Liu

State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022 China

Search for more papers by this author
Chunli Wang

Corresponding Author

Chunli Wang

State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022 China

E-mail: [email protected]; [email protected]; [email protected]

Search for more papers by this author
Shaohua Wang

Shaohua Wang

National Engineering Research Center of Nonferrous Metals Materials and Products for New Energy, GRINM Group Co., Ltd., Beijing, 100088 China

GRIMAT Engineering Institute Co., Ltd., Beijing, 101407 China

Search for more papers by this author
Yongzhi Li

Corresponding Author

Yongzhi Li

School of Science, Inner Mongolia University of Science and Technology, Baotou, 014010 China

E-mail: [email protected]; [email protected]; [email protected]

Search for more papers by this author
Dongming Yin

Dongming Yin

State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022 China

Search for more papers by this author
Limin Wang

Limin Wang

State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022 China

School of Applied Chemistry and Engineering, University of Science and Technology of China (USTC), Hefei, 230026 China

Search for more papers by this author
Yong Cheng

Corresponding Author

Yong Cheng

State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022 China

E-mail: [email protected]; [email protected]; [email protected]

Search for more papers by this author
First published: 05 December 2023
Citations: 2

Abstract

The interaction between fluorinated surface in the partially reduced nano-crystallite titanium dioxide (TiO2-x(F)) and MgH2 is studied for the first time. Compared with pristine MgH2 (416 °C), the onset desorption temperature of MgH2+5 wt.% TiO2-x(F) composite can be dramatically lowered to 189 °C. In addition, the composite exhibits remarkable dehydrogenation kinetics, which can release 6.0 wt.% hydrogen thoroughly within 6 min at 250 °C. The apparent activation energy for dehydriding is decreased from 268.42 to 119.96 kJ mol−1. Structural characterization and theoretical calculations indicate that the synergistic effect between multivalent Ti species, and the in situ formed MgF2 and MgF2-xHx is beneficial for improving the hydrogen storage performance of MgH2. Moreover, oxygen vacancies can accelerate the electron transportation and facilitate hydrogen diffusion. The study provides a novel perspective on the modification of MgH2 by fluorinated transition metal oxide catalyst.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.