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. 2019 Oct 10;9:14489. doi: 10.1038/s41598-019-51048-5

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Open circuit potential for the InN/InGaN reference electrode. (A) OCP as a function of time for the 0.8-ML-InN/35-nm-In_0.45Ga_0.55N electrode and Ag/AgCl reference electrode successively immersed for 150 seconds in 0.001, 0.01, 0.1 and 1 M KCl aqueous solutions. (B) Long-time OCP measurement for the same sample over 12 hours in 0.1 M KCl aqueous solution. (C,D) OCP as a function of time for the 0.8-ML-InN/35-nm-In_0.45Ga_0.55N electrode and Ag/AgCl reference electrode immersed alternately for 150 seconds (C) in water and pH 8.5 KOH aqueous solutions and (D) in 0.1 and 1 M KCl aqueous solutions at 50 °C.