In this manuscript, the authors report a Cu/Ti self-supported electrode in one step by plating a copper film on a Ti foil by a simple electro-deposition method, with exhibited a maximum alanine yield of 324 μmol with the corresponding FE of 90.5% at −0.62 V (vs. RHE). ATR-SEIRAS demonstrated that the coupling of PA and NH2OH is a tandem chemical-electrochemical catalytic cascade process. The novelty of this work is very good. I recommend the publication of this work after minor revision. Below are some issues to be addressed:

1. In Fig. 3 (b)，the “A maximum yield for alanine of 374.0 μmol was reached when the pH of the electrolyte solution was 6.51, but the FE was only 59.1%”. It is necessary to explain why the catalytic effect is best at PH=6.51.
2. The Cu and Ti also exhibit the potential electrocatalytic activity for the formation of amino acid. So, what are the respective roles of Cu and Ti in Cu/Ti catalysts?
3. This work reports a Cu/Ti self-supported electrode in one step by plating a copper film on a Ti foil by a simple electro-deposition method. Whether the method can be extended to other metals?
4. Some recently articles on the electrosynthesis of C-N or C=N bonded nitrogenous chemicals are suggested to be cited, such as Angew. Chem. Int. Ed. 2024, e202417130; Sci China Chem, 2024, 67, 1946-1952.