As shown in Fig. 4a, PNP absorbs visible light strongly at 400 nm [46] whereas PAP absorbs little light from 325 to 600 nm [47]; therefore, the kinetics of PNP reduction can be quantified the concentration of residual PNP, C, by measuring the absorbance A at 400 nm following Beer's law: C = ɛbA−1, where ɛ is the molar absorptivity of PNP and b is the path length (b = 1 cm), as shown in Fig. 4b. As shown in Fig. 4c, the PNP reduction follows the pseudo-first order rate law in the presence of both Pt and Pt/Ni nanoparticles, which is in great contrast of the negligible reduction when both of them are absent:
equation(3)
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