Ion‐Assisted Preparation of Bimetallic Porous Nanodendrites for Active and Stable Water Electrolysis. Issue 17 (31st January 2023)

• Record Type: Journal Article
• Authors: Xu, Yanchao; Wei, Shuting; Zhang, Lei; Wu, Qiong; Wang, Feng; Fan, Jinchang; Wang, Dewen; Wu, Tianzhun; Cui, Xiaoqiang
• Is Part Of: Small. Volume 19:Issue 17(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2023-01-31
• Subjects: dendritic nanostructures -- hydrogen evolution reaction -- ion‐assisted strategy -- ligand effect -- nanoalloys; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.202207332
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: Delicate electrochemical active surface area (ECSA) engineering over the exposed catalytic interface and surface topology of platinum‐based nanomaterial represents an effective pathway to boost its catalytic properties toward the clean energy conversion system. Here, for the first time, the facial and universal production of dendritic Pt‐based nanoalloys (Pt‐Ni, Co, Fe) with highly porous feature via a novel Zn 2+ ‐mediated solution approach is demonstrated. In the presence of Zn 2+ during synthesis, the competition of different galvanic replacement reactions and consequently generated "branch‐to‐branch" growth mode are believed to play key roles for the in situ fabrication of such unique nanostructure. Due to the fully exposed active sites and ligand effect‐induced electronic optimization, electrochemical hydrogen evolution in alkaline media on these catalysts exhibit dramatic activity enhancement, delivering a current density of 30.6 mA cm −2 at a 70 mV overpotential for the Pt3 Ni nanodendrites and over 7.4 times higher than that of commercial Pt/C. This work highlights a general and powerful ion‐assisted strategy for exploiting dendritic Pt‐based nanostructures with efficient activities for water electrolysis. Abstract : Highly porous Pt nanoalloys are established via a novel ion‐assisted strategy for efficient hydrogen evolution. Stronger driving forces coming from the galvanic reaction of underpotential deposition [UPD Zn 0 |Pt 2+ ] than coming from the [UPD Ni 0 |Pt 2+ ] trigger the "branch‐to‐branch" growth mode, which is the key in the formation of highly dendritic structure. In depth interpretation of growth mechanism provides the universal production of dendritic Pt nanostructures (Pt‐Ni, Co, Fe).