Zhu Enbo, Liu Yang, Huang Jin, Zhang Ao, Peng Bosi, Liu Zeyan, Liu Haotian, Yu Jiaji, Li Yan-Ruide, Yang Lili, Duan Xiangfeng, Huang Yu
ACS Nano. 2023 Jul 25;17(14):14152-14160. doi: 10.1021/acsnano.3c04771. Epub 2023 Jul 6.
Extensive macroscale two-dimensional (2-D) platinum (Pt) nanowire network (NWN) sheets are created through a hierarchical self-assembly process with the aid of biomolecular ligands. The Pt NWN sheet is assembled from the attachment growth of 1.9 nm-sized 0-D nanocrystals into 1-D nanowires featuring a high density of grain boundaries, which then interconnect to form monolayer network structures extending into centimeter-scale size. Further investigation into the formation mechanism reveals that the initial emergence of NWN sheets occurs at the gas/liquid interfaces of the bubbles produced by sodium borohydride (NaBH) during the synthesis process. Upon the rupture of these bubbles, an exocytosis-like process releases the Pt NWN sheets at the gas/liquid surface, which subsequently merge into a continuous monolayer Pt NWN sheet. The Pt NWN sheets exhibit outstanding oxygen reduction reaction (ORR) activities, with specific and mass activities 12.0 times and 21.2 times greater, respectively, than those of current state-of-the-art commercial Pt/C electrocatalysts.
借助生物分子配体，通过分级自组装过程制备出了大面积的宏观二维铂（Pt）纳米线网络（NWN）片。Pt NWN片由1.9纳米大小的零维纳米晶体附着生长形成具有高密度晶界的一维纳米线组装而成，这些纳米线相互连接形成延伸至厘米级尺寸的单层网络结构。对形成机制的进一步研究表明，NWN片最初出现在合成过程中硼氢化钠（NaBH）产生的气泡的气液界面处。这些气泡破裂时，类似胞吐的过程会在气液表面释放出Pt NWN片，随后这些片合并成连续的单层Pt NWN片。Pt NWN片表现出出色的氧还原反应（ORR）活性，其比活性和质量活性分别比目前最先进的商业Pt/C电催化剂高12.0倍和21.2倍。
