Turning a quantitative eye to the task, Kamimura et al. used electrochemical mass spectroscopy (EMS) to compare the water splitting properties of n- and p-type InGaN nanowires\cite{Kamimura_2013}. Interestingly, while n-InGaN nanowires showed no ability to split water– in fact, they merely corroded, the EMS showing signals for N\(_{2}\) that could only have come from the nanowire electrodes. By contrast, the p-InGaN saw noticeable H\(_{2}\) evolution, which was increased with exposure to light, indicating that this was, in fact photoelectrochemical water splitting.