This paper reveals a water-promoted pathway in photocatalytic methane reforming into methanol using Ag nanoparticle-loaded InGaN nanowires as photocatalysts, achieving a high selectivity (>93%) of methanol and production rate (21.4 µmol cm-2 h-1 or 45.5 mmol g-1 h-1). It was found that water molecules can stabilize the Ag species with high reduction state and water can tune the electronic states of Ag/InGaN and produce more active surface sites for photocatalytic methane oxidation into methanol. These findings are interesting.
This paper can be accepted after considering followings.
1. How is the activity and selectivity of individual InGaN?
2. The units are inconsistent between the abstract (45.5 mmol g-1 h-1) and the main text (45.5 µmol mg-1 h-1) .
3. Under xenon lamp irradiation, both InGaN and Ag can be excited. Ag nanoparticles exhibit localized surface plasmon resonance (LSPR) effect, making it difficult to solely speculate on the transfer of electrons from InGaN to Ag. Regarding this matter, it is necessary to provide evidence or explanations.
4. In the paper, the origin of hydrogen in methanol was demonstrated using isotopic evidence, indicating that it does not come from water. The source of oxygen in methanol, whether it is derived from water or oxygen gas, remains to be determined. Furthermore, without the addition of oxygen gas, what are the results when methane and water are only introduced?
5. The number of references is relatively low. The following articles are recommended for citation in the manuscript: (Nat. Commun., 2023, 14, 2000; ACS Catal., 2023, 13, 10, 6630–6640; Res Chem. Intermed., 2019, 45, 5849–5861; Res. Chem. Intermed., 2022, 48, 5155–5168; Res. Chem. Intermed., 2010, 36, 463–472.)

This manuscript has been carefully revised according to reviewers' comments. Therefore, it should be accepted.