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Fig. 2. (Color online) XPS spectra of C1s region for carbon felt (a) without pretreatment and (b) with HNO3 pretreatment. XPS spectra of O1s region for carbon felt (c) without pretreatment and (d) with HNO3 pretreatment.
New Phys.: Sae Mulli 2023;73:429~436 https://doi.org/10.3938/NPSM.73.429
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