1. C+ ion implanted single crystal diamond with amorphous surface for efficient oxygen evolution catalysis.
- Author
-
Tu, Juping, Wang, Yong, He, Jian, Liu, Jinlong, Jia, Baorui, Chen, Liangxian, Wei, Junjun, and Li, Chengming
- Subjects
- *
SINGLE crystals , *DIAMOND surfaces , *HYDROGEN evolution reactions , *CARBON-based materials , *ION implantation , *DIAMOND films , *CATALYSIS , *DIAMOND crystals - Abstract
Oxygen evolution reaction (OER) is critical in water splitting for green hydrogen gas production due to its sluggish kinetics; however, commercial OER catalysts commonly suffer from high cost, low catalytic activity and poor stability. Herein, we developed a C+ ion implantation method to modify single crystal diamond, and the resultant surface amorphous layer not only raised the active site number but also increased the content of the C=O group, thus significantly improving the OER activity. The C+ ion implanted high-temperature and high-pressure (C+-HTHP) and chemical vapor deposition (C+-CVD) diamonds both exhibit low OER overpotential with η 10 of 317 mV and 325 mV respectively, superior to those of HTHP diamond (360 mV), CVD diamond (395 mV) and RuO 2 (364 mV). The potentiostatic testing shows that the C+ implanted diamonds almost didn't undergo the rise of OER overpotential upon catalysis for more than 12 h at a current density of 10 mA cm−2, suggesting a high catalytic stability, owing to the strong bonding between single crystal diamond and amorphous carbon layer. For the first time, we utilized carbon ion implantation to prepare diamond-based high-performance OER catalyst, which broadens the understanding of carbon-based materials in OER catalysis. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF