Abstract
Boron doped diamond (BDD) film electrodes have a good application prospect in the field of seawater salinity detection. However, the influence mechanism of boron doping level (given by B/C ratio) on seawater salinity detection limited its application. In this paper, microstructure-phase-electrochemical relationships in BDD film electrodes were systematically investigated, aiming to reveal the effect of boron content on seawater salinity measurement, and lay a foundation for practical application of BDD film electrodes. With the increase of the boron doping, the content of non-diamond phase increased, while the crystallinity and the grain size of diamond decreased. Meanwhile, when the B/C ratio of BDD electrode reached 10000 ppm, they had the largest electroactive surface areas (EASA) and the smallest diffusion resistance, and their electrochemical performance was optimal in this study. In addition, BDD film electrode exhibited fast heterogeneous electron transfer in both internal Fe(CN)6−3/−4 and external Ru(NH3)6+2/+3 redox systems. Under the optimal parameter setting, the maximum signal response of BDD electrode at 40 ‰ was 69 mA/cm2 and the measurement error was less than 0.81 ‰. Appropriate proportion of sp2-C and B-sp3-C phases can significantly improve the detection performance of BDD electrode.
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