Preparation of Ru-doped TiO2 nanotube arrays through anodizing TiRu alloys for bifunctional HER/OER electrocatalysts

Yuejiao Liu; Xixin Wang; Mengyao Yang; Ying Li; Yue Xiao; Jianling Zhao

doi:10.1039/d3nr03831a

Preparation of Ru-doped TiO₂ nanotube arrays through anodizing TiRu alloys for bifunctional HER/OER electrocatalysts

Nanoscale. 2023 Nov 16;15(44):17936-17945. doi: 10.1039/d3nr03831a.

Authors

Yuejiao Liu¹, Xixin Wang¹, Mengyao Yang¹, Ying Li¹, Yue Xiao¹, Jianling Zhao¹

Affiliation

¹ School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China. hebutzhaoj@126.com.

PMID: 37904619
DOI: 10.1039/d3nr03831a

Abstract

In this research, Ru-doped TiO₂ nanotube arrays (Ru-TNTA) were prepared by anodizing TiRu alloys, and the effects of annealing temperature, Ru content and test temperature on their performances for the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) were investigated. The results show that the unannealed Ru-TNTA (a-Ru-TNTA) exhibits superior activity for the HER, and the Ru-TNTA annealed at 450 °C (c-Ru-TNTA) shows excellent activity for the OER. The Ru content of TiRu impacts the electrochemically active surface area (ECSA) and the charge transfer resistance (R_ct) significantly. When the Ru content of Ru-TNTA is 6%, its performance is optimal. Moreover, the electrocatalytic activity of Ru-TNTA improves with increasing test temperature, and the overpotentials of a-Ru-TNTA and c-Ru-TNTA at 80 °C are 19 mV and 227 mV (10 mA cm^-2), respectively. Ru-TNTA exhibits excellent electrocatalytic performance for water splitting and good stability, which provides a new idea for the preparation of advanced bifunctional electrocatalysts for water splitting.