In the frequency range of 1200-1800 cm -1 , the Raman spectra of carbon cloth overlap with some important vibration modes of the C-N bond feature, so we modified the gas diffusion layer while preserving its main function. To reduce the background spectra, carbon paper was used to support copper nanoparticles. The carbon cloth is placed on the bottom of the carbon paper catalyst support so that it maintains its hydrophobicity. As the carbon cloth is made of fibers, the interspace of the fibers can let the gas permeate, so the gas diffusion layer still serves its primary function.