Search

The influence of the reduction method on the morphology and performance of the catalyst still controversial. In this study, hydrogen, Shewanella oneidensis MR-1 (MR-1), MR-1 and hydrogen coreduction are used to reduce the palladium ions adsorbed by MR-1 to obtain Pd/C H 2 , Pd/C M , and Pd/C H 2 +M catalyst, respectively. It is found that the palladium nanoparticles (Pd NPs) in Pd/C H 2 +M are the largest, while the Pd NPs in Pd/C M are the smallest. This is due to the reduction of Pd NPs in Pd/C H 2 +M under anaerobic conditions to form smaller Pd NPs that will further aggregate and grow in H 2 . In addition, Pd/C M exhibited the best catalytic performance with a mass activity of 0.31 A mg -1 , better than that of Pd/C H 2 (0.06 A mg -1 ) and Pd/C H 2 +M (0.13 A mg -1 ). This study provides a meaningful reference for the selection of reduction methods in metal catalysts., Competing Interests: The authors declare no competing financial interest., (© 2023 The Authors. Published by American Chemical Society.)

A flexible carbon nanofiber film with high conductivity was prepared by electrospinning, and then Cu was uniformly deposited on the fiber film by pulse electrodeposition to prepare Cu nanocrystal/carbon nanofiber film. Cu@PtCu/carbon nanofiber (Cu@PtCu/CNF) catalytic films were synthesized by in-situ substitution reduction. The Cu@PtCu/CNF catalytic film solves the problem of uneven activity of the catalytic layer and can be directly used as the catalytic layer. The morphology and structure were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Electrochemical test results show that the Cu@PtCu/CNF catalytic films obtained at the chloroplatinic acid concentration of 0.5 mg·mL -1 (N2) exhibited 2.5 times specific activity when compared with commercial Pt/C catalysts. After 5000 cycles of stability test, the electrochemical surface areas (ECSAs) were still maintained at 80%, and the half-wave potential decreased by 11 mV, which was better than those of commercial Pt/C catalysts., Competing Interests: The authors declare no competing financial interest., (© 2022 The Authors. Published by American Chemical Society.)