Facile Synthesis of High Areal Density and Stable Pt Single‐Atom Electrocatalysts by Arc Discharge Atomization and CoNi Trapping

作者：Hongzhe He, Xiaoqiong Ren, Ruoqun Zhang, Sasha Yang, Jinxing Gu, Ke Wang, Binbin Qian, Ning Chen, Lian Zhang, Jianglong Yu, Yuan Cheng, Baiqian Dai · 发表于：Advanced Science · 年份：2025 · DOI：10.1002/advs.202511806 · 被引用次数：5 · 研究领域：Electrocatalysts for Energy Conversion、Fuel Cells and Related Materials、Advanced Memory and Neural Computing

Abstract Pt‐group metal single‐atom catalysts (SACs) with a large single‐atom areal density are highly desirable for efficient electrocatalysis but remain challenging to synthesize. Herein, a facile vacuum direct current arc discharge (DCAD) strategy is reported for the rapid and scalable synthesis of Pt SACs with an unprecedented areal density of 10.6 atoms nm −2 (3.82 wt.% Pt loading) firmly anchored on CoNi nanoalloy and confined by carbon nanotubes (CoNiPt SA @G). Notably, due to the strong electron trapping effect between Pt SA and CoNi substrates, CoNiPt SA @G retains its structural integrity at 1000 °C, demonstrating an outstanding thermal stability despite the ultra‐high areal density. Moreover, the DCAD strategy is universal, which can be applied to other metals such as Iridium. It is also scalable, with a demonstrated gram‐scale yield achieved within 0.5 h. The resulting CoNiPt SA @G catalyst exhibits exceptional hydrogen evolution reaction performance, achieving an overpotential of 23 mV at 10 mA cm −2 , a mass activity over 5 times higher than that of 20 wt.% Pt/C catalyst and high stability during the 120 h test. This work provides a groundbreaking pathway for the large‐scale production of high single‐atom areal density, thermally robust SACs, advancing their practical applications in clean energy technologies.