中科院化学所李玉良团队报道了高分散铂氯原子锚定在金量子点上的高效电催化剂。相关研究成果发表在2022年1月19日出版的《美国化学会杂志》。

开发高效耐用的电催化剂是实现商用燃料电池的唯一途径。

研究人员开发了一种新的、高效的方法，以多孔石墨烯为载体（PtCl2Au（111）/GDY）的原子型铂-氯物种外延生长金量子点，成功地获得了尺寸为2.37nm的多组分量子点。该电催化剂对甲醇氧化反应（MORs）和乙醇氧化反应（EOR）的质量活性分别为175.64和165.35A mgPt-1。实验数据分别比市售Pt/C高85.67倍和246.80倍。催化剂对MORs也表现出高的稳定性，在10 mA cm^–2下110 h后比活性衰减可忽略不计。

结构表征和理论计算均表明，这种优异的催化性能可归因于引入氯来修饰铂表面的d-带结构和抑制MOR的CO中毒途径。结果表明，原子分散金属物种裁剪策略为高效设计高活性和稳定的催化剂开辟了一条新途径。

附：英文原文

Title: Highly Dispersed Platinum Chlorine Atoms Anchored on Gold Quantum Dots for a Highly Efficient Electrocatalyst

Author: Lan Hui, Xueting Zhang, Yurui Xue, Xi Chen, Yan Fang, Chengyu Xing, Yuxin Liu, Xuchen Zheng, Yuncheng Du, Chao Zhang, Feng He, Yuliang Li

Issue&Volume: January 19, 2022

Abstract: The development of efficient and durable electrocatalysts is the only way to achieve commercial fuel cells. A new, efficient method was utilized for epitaxial growth of gold quantum dots using atomically platinum chlorine species with porous graphdiyne as a support (PtCl2Au(111)/GDY), for obtaining successful multicomponent quantum dots with a size of 2.37 nm. The electrocatalyst showed a high mass activity of 175.64 A mgPt–1 for methanol oxidation reactions (MORs) and 165.35 A mgPt–1 for ethanol oxidation reactions (EORs). The data for this experiment are 85.67 and 246.80 times higher than those of commercial Pt/C, respectively. The catalyst also showed highly robust stability for MORs with negligible specific activity decay after 110 h at 10 mA cm–2. Both structure characterizations and theoretical calculations reveal that the excellent catalytic performance can be ascribed to the chlorine introduced to modify the d-band structure on the Pt surface and suppression of the CO poisoning pathway of the MOR. Our results indicate that an atomically dispersed metal species tailoring strategy opens up a new path for the efficient design of highly active and stable catalysts.

DOI: 10.1021/jacs.1c12310

Source: https://pubs.acs.org/doi/10.1021/jacs.1c12310