The abstract reports a hydroperoxide yield of 1.18% and an electron-transfer number of 3.86 for CC1U at 0.5 V, whereas Section 3.2, Table 3, and the Conclusions report 1.01% and 3.97. These pairs are also not mutually compatible under Equations 4 and 5: a hydroperoxide yield near 1% should correspond to an electron-transfer number close to 3.98, while n = 3.86 would imply a substantially higher hydroperoxide yield. Could the authors clarify the correct values and provide the underlying disk current, ring current, collection efficiency, and exact potential point used for the calculation?
The article also describes the materials as metal-free, although Ca was detected in all samples and the text suggests possible calcium-phosphate formation. Could the authors clarify whether metal-free means without intentionally added transition metals and indicate whether sensitive elemental measurements, such as ICP–MS or ICP–OES, were performed to exclude catalytically relevant trace transition-metal impurities?