摘要：Hierarchical Pt-alloys enriched with active sites are highly desirable for efficient catalysis,but their syntheses generally need time-consuming and elaborate annealing treatment at high *** herein report a surface active-site engineering strategy for constructing the hierarchical PtNi nanocatalysts with an atomic Pt-skin layer(PtNi@Pt-SL)towards efficient triiodide reduction reaction(TRR)via an acid-dealloying *** facile acid-dealloying process promotes the formation of surface Pt active sites on the hierarchical Pt-alloys,and thus results in good catalytic performance towards *** calculation reveals that the enhanced catalytic property stems from the moderate energy barriers for iodide atoms on the surface Pt *** surface active-site engineering strategy paves a new way for the design of active and durable electrocatalysts.

摘要：应用3D打印技术制备准固态微型超级电容器(MSCs)在可编程结构设计和高质量负载电极制造方面具有固有的优势.然而,缺乏高性能的可打印墨水和厚电极内缓慢的离子传输,对其实际电荷存储能力提出了重大挑战.本文成功开发了一种具有优异流变性能的新型NiCo_(2)S_(4)基纳米复合墨水,并结合直墨书写的3D打印技术合理设计了准固态MSCs的三维结构.得益于牢固锚定在还原氧化石墨烯(rGO)表面的NiCo_(2)S_(4)纳米颗粒和有序的三维微孔,锯齿状厚电极提供了丰富的反应位点并增强了离子传输.因此,三层锯齿状MSCs的面电容高达416.7 mF cm^(-2).在1 mA cm^(-2)的电流密度下,单层、双层和三层电极的锯齿状MSCs的面电容与相对应的网格状MSCs相比,分别增加了127.1%、349.8%和585.9%.本工作为高面电容MSCs的材料和电极结构的跨尺度设计提供了新见解,推动了MSCs在柔性便携式电子设备中的集成应用研究.