College of Geography and Environmental Science, College of Chemistry and Life Science, Zhejiang Normal University, Jinhua 321004, China.
College of Geography and Environmental Science, College of Chemistry and Life Science, Zhejiang Normal University, Jinhua 321004, China.
J Colloid Interface Sci. 2017 Nov 1;505:307-314. doi: 10.1016/j.jcis.2017.05.088. Epub 2017 May 26.
Herein, a simple one-pot aqueous method was developed for the fabrication of uniform hollow bimetallic AgPt alloyed nanocrystals (H-AgPt NCs) by using 5-aminoorotic acid (5-amino-2,6-dioxo-1,2,3,6-tetrahydropyrimidine-4-carboxylic acid) as a growth-directing agent, without any seed, organic solvent or template involved. The prepared H-AgPt NCs displayed enhanced electrocatalytic activity for hydrogen evolution reaction (HER) with a more positive onset overpotential (η) of -28mV and a smaller Tafel slope of 40mVdec relative to commercial Pt black (-34mV, 50mVdec) and Pt/C (20wt.%, -33mV, 33mVdec) in 0.5M HSO. Meanwhile, the obtained catalyst exhibited improved catalytic features toward oxygen reduction reaction (ORR) with a positive η (0.916V) and enhanced kinetic current density (243.23mAmg) in 0.1M HClO at 0.850V compared with Pt black (0.876V, 25.85mAmg).
在此，开发了一种简单的一锅水相法，通过使用 5-氨基乳清酸（5-氨基-2,6-二氧代-1,2,3,6-四氢嘧啶-4-羧酸）作为生长导向剂，在不使用任何种子、有机溶剂或模板的情况下，制备出均匀的空心双金属 AgPt 合金纳米晶体（H-AgPt NCs）。所制备的 H-AgPt NCs 在 0.5M HSO 中对析氢反应（HER）表现出增强的电催化活性，相对于商业 Pt 黑（-34mV，50mVdec）和 Pt/C（20wt.%，-33mV，33mVdec），具有更正的起始过电位（η）为-28mV 和更小的塔菲尔斜率为 40mVdec。同时，与 Pt 黑（0.876V，25.85mAmg）相比，在 0.1M HClO 中，在 0.850V 时，获得的催化剂对氧还原反应（ORR）表现出改善的催化特性，具有正的 η（0.916V）和增强的动力学电流密度（243.23mAmg）。
