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(a,b) Degradation of methylene blue dye in acidic and basic conditions. (c) Degradation of acid black1 using an optimized electrode (NCQDs-G@Co9S8). (d) Degradation concentration and degradation of (NCQDs-G@Co9S8). (e) Cr(IV) reduction using optimized electrode (NCQDs-G@Co9S8). (f) Cyclic stability of optimized composite electrode.
