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Materials (Basel). 2016 Dec 14;9(12). pii: E1012. doi: 10.3390/ma9121012.

Preparation of TiO₂-Decorated Boron Particles by Wet Ball Milling and their Photoelectrochemical Hydrogen and Oxygen Evolution Reactions.

Author information

1
Department of Mechanical Engineering, Chungnam National University, Daejeon 34134, Korea. gpwlsdlsz@naver.com.
2
Department of Chemistry, Yeugnam University, Gyeongsan 38541, Korea. zxvcod@naver.com.
3
School of Aerospace and Mechanical Engineering, Korea Aerospace University, Goyang, Gyeonggi-do 21071, Korea. hgsung@kau.ac.kr.
4
The Fourth R&D Institute, Agency for Defense Development, Daejeon 34188, Korea. hshyunin@add.re.kr.
5
Department of Chemistry, Yeugnam University, Gyeongsan 38541, Korea. youngkusohn@ynu.ac.kr.
6
Department of Mechanical Engineering, Chungnam National University, Daejeon 34134, Korea. wgshin@cnu.ac.kr.

Abstract

TiO₂-coated boron particles were prepared by a wet ball milling method, with the particle size distribution and average particle size being easily controlled by varying the milling operation time. Based on the results from X-ray photoelectron spectroscopy, transmission electron microscopy, energy dispersive X-ray analysis, and Fourier transform infrared spectroscopy, it was confirmed that the initial oxide layer on the boron particles surface was removed by the wet milling process, and that a new B-O-Ti bond was formed on the boron surface. The uniform TiO₂ layer on the 150 nm boron particles was estimated to be 10 nm thick. Based on linear sweep voltammetry, cyclic voltammetry, current-time amperometry, and electrochemical impedance analyses, the potential for the application of TiO₂-coated boron particles as a photoelectrochemical catalyst was demonstrated. A current of 250 μA was obtained at a potential of 0.5 V for hydrogen evolution, with an onset potential near to 0.0 V. Finally, a current of 220 μA was obtained at a potential of 1.0 V for oxygen evolution.

KEYWORDS:

TiO2 coating; boron particle; hydrogen evolution; oxygen evolution; photoelectrochemical; wet ball milling

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