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短程有序铱单原子集成入钴尖晶石结构中用于高效电催化水氧化
作者:小柯机器人 发布时间:2021/3/28 15:18:06

浙江工业大学朱艺涵团队将短程有序铱单原子集成到氧化钴尖晶石结构中用于高效电催化水氧化。相关研究成果发表在2021年3月25日出版的《美国化学会杂志》。

贵金属以其独特的电子结构和不可替代的活性在催化领域有着广泛的应用,但遗憾的是,贵金属在单原子、团簇、纳米粒子和大块晶体的几何结构选择上受到限制。

该文中,研究人员提出将贵金属原子整合到过渡金属氧化物的晶格中,以创造一种新型的杂化结构来克服这一限制。研究表明,铱单原子能以短程有序的方式进入钴尖晶石氧化物的阳离子中心,其空间相关性与主体晶格相同。

在酸性条件下,合成的Ir0.06Co2.94O4催化剂对具有挑战性的析氧反应表现出比母体氧化物高2个数量级的电催化活性。由于铱与钴氧化物载体之间的强相互作用,Ir0.06Co2.94O4催化剂在酸性条件下的耐腐蚀性和氧化电位显著提高。

该工作消除了贵金属的“紧密堆积”限制,并提供了创造各种催化应用所需拓扑结构的类似物的机会。

附:英文原文

Title: Short-Range Ordered Iridium Single Atoms Integrated into Cobalt Oxide Spinel Structure for Highly Efficient Electrocatalytic Water Oxidation

Author: Jieqiong Shan, Chao Ye, Shuangming Chen, Tulai Sun, Yan Jiao, Lingmei Liu, Chongzhi Zhu, Li Song, Yu Han, Mietek Jaroniec, Yihan Zhu, Yao Zheng, Shi-Zhang Qiao

Issue&Volume: March 25, 2021

Abstract: Noble metals manifest themselves with unique electronic structures and irreplaceable activity toward a wide range of catalytic applications but are unfortunately restricted by limited choice of geometric structures spanning single atoms, clusters, nanoparticles, and bulk crystals. Herein, we propose how to overcome this limitation by integrating noble metal atoms into the lattice of transition metal oxides to create a new type of hybrid structure. This study shows that iridium single atoms can be accommodated into the cationic sites of cobalt spinel oxide with short-range order and an identical spatial correlation as the host lattice. The resultant Ir0.06Co2.94O4 catalyst exhibits much higher electrocatalytic activity than the parent oxide by 2 orders of magnitude toward the challenging oxygen evolution reaction under acidic conditions. Because of the strong interaction between iridium and cobalt oxide support, the Ir0.06Co2.94O4 catalyst shows significantly improved corrosion resistance under acidic conditions and oxidative potentials. This work eliminates the “close-packing” limitation of noble metals and offers promising opportunity to create analogues with desired topologies for various catalytic applications.

DOI: 10.1021/jacs.1c01525

Source: https://pubs.acs.org/doi/10.1021/jacs.1c01525

 

期刊信息

JACS:《美国化学会志》,创刊于1879年。隶属于美国化学会,最新IF:14.612
官方网址:https://pubs.acs.org/journal/jacsat
投稿链接:https://acsparagonplus.acs.org/psweb/loginForm?code=1000