Electrochemical Behavior of Saturated Potassium Nitrate Salts with Boron-Doped Diamond Electrode
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2025-06-27 |
| Journal | ACS Applied Engineering Materials |
| Authors | Rene Pfeifer, Ondrej SzabĆ³, Dhananjay K. Sharma, Johannes Eidenschink, FrankāMichael Matysik |
| Institutions | Czech Academy of Sciences, Institute of Physics, Czech Technical University in Prague |
Abstract
Section titled āAbstractāPotassium nitrate (KNO<sub>3</sub>) is widely utilized in concentrated solar power tower (CSPT) fuels and as an additive to address the issue of lithium dendrite formation in lithium-ion batteries and CSPT systems. This study investigates the influence of boron-doped diamond (BDD) films and their interaction with KNO<sub>3</sub>-saturated solutions to enhance these devicesā efficiency and energy capacity. One critical factor in achieving higher energy devices is the electrochemical stability window (ESW). Consequently, this research examines various properties of BDD, including grain size, doping level, conductivity, carbon-sp<sup>3</sup>/sp<sup>2</sup> ratio, and electrolyte characteristics such as conductivity and pH. The results demonstrate that a BDD film grown at a B/C ratio of 2000 ppm, a grain size of 1.75 Ī¼m and a carbon-sp<sup>3</sup>/sp<sup>2</sup> ratio value of 0.31 achieved the broadest ESW of 3.5 V. Advantageously, the properties of the KNO<sub>3</sub> electrolyte, specifically concentration and pH, had minimal impact on the ESW. Controversially, the ionic conductivity of the electrolyte increased with concentration, with a peak value of 204 mS cm<sup>-1</sup> observed in the supersaturated solution (3.78 mol kg<sup>-1</sup>).