High activity methanol/h2o2 catalyst of nanoporous gold from al-au ribbon precursors with various circumferential speeds
American Chemical Society
Place of Publication
School of Engineering
We have prepared nanoporous gold (np-Au) with a three-dimensional (3D) bicontinuous interpenetrating ligament-channel structure by dealloying the melt spun Al2Au ribbon precursors with three different circumferential speeds (Sc). With increasing Sc, the lattice constant (a0) of precursors decreases. After the dealloying procedure, the np-Au samples have an increasing a0 and a decreasing pore size with increasing Sc. There exists the heredity of the preferred orientation factors (F) between precursors and np-Au samples. The cyclic voltammetry (CV) curves of methanol electro-oxidation reaction (MOR) on np-Au samples are related to their F and show a higher activity with a higher Sc. In addition, np-Au with a lower pore size exhibits a higher sensitivity for the concentration of H2O2 in phosphate buffered solutions (PBS), which reaches 73.4 μA mM-1 cm-2 with Sc = 18.3 m/s. These results suggest that we can change the pore size of the dealloyed np-Au by adjusting the Sc of the precursors, and then enhance the catalytic activity of np-Au. (Chemical Equation Presented). © 2016 American Chemical Society.