title: Ultrathin Two-Dimensional Pd-Based Nanorings as Catalysts for Hydrogenation with High Activity and Stability.
abstract: Despite a few reports on the synthesis of ultrathin 2D nanosheets made of noble metals, it still remains a tremendous challenge to generate their ultrathin hollowed nanostructures, which are of particular interest in highly active catalysis due to their unique structural features. Here, the synthesis of ultrathin 2D Pd nanorings is reported with a hollow interior by selective epitaxial growth of Pd atoms on the periphery of the as-preformed Pd nanosheets in combination with oxidative etching. This approach can be extended to fabricate Pd-based bimetallic ultrathin nanorings such as Pd-Pt. The Pd nanorings exhibit substantially enhanced activity toward the hydrogenation of p-nitrophenol, which is 2.2 and 33.4 times higher than that of the Pd nanosheets and commercial Pd black, respectively. Significantly, the Pd nanorings are highly stable with only less than 11% loss in activity compared to 45.7% loss of the Pd nanosheets and 72.2% loss of the Pd black after ten cycles.
authors.affiliation: State Key Laboratory of Silicon Materials, School of Materials Science and Engineering and Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University, Hangzhou, Zhejiang, 310027, P. R. China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Li
authors.affiliation: State Key Laboratory of Silicon Materials, School of Materials Science and Engineering and Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University, Hangzhou, Zhejiang, 310027, P. R. China.
authors.forename: Wenxing
authors.initials: W
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Silicon Materials, School of Materials Science and Engineering and Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University, Hangzhou, Zhejiang, 310027, P. R. China.
authors.forename: Kaiyang
authors.initials: K
authors.lastname: Xia
authors.affiliation: State Key Laboratory of Silicon Materials, School of Materials Science and Engineering and Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University, Hangzhou, Zhejiang, 310027, P. R. China.
authors.forename: Wenjun
authors.initials: W
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Silicon Materials, School of Materials Science and Engineering and Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University, Hangzhou, Zhejiang, 310027, P. R. China.
authors.forename: Yingying
authors.initials: Y
authors.lastname: Jiang
authors.affiliation: State Key Laboratory of Silicon Materials, School of Materials Science and Engineering and Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University, Hangzhou, Zhejiang, 310027, P. R. China.
authors.forename: Yuewu
authors.initials: Y
authors.lastname: Zeng
authors.affiliation: State Key Laboratory of Silicon Materials, School of Materials Science and Engineering and Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University, Hangzhou, Zhejiang, 310027, P. R. China.
authors.forename: Hui
authors.initials: H
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Silicon Materials, School of Materials Science and Engineering and Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University, Hangzhou, Zhejiang, 310027, P. R. China.
authors.forename: Chuanhong
authors.initials: C
authors.lastname: Jin
authors.affiliation: State Key Laboratory of Silicon Materials, School of Materials Science and Engineering and Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University, Hangzhou, Zhejiang, 310027, P. R. China.
authors.forename: Ze
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Silicon Materials, School of Materials Science and Engineering and Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University, Hangzhou, Zhejiang, 310027, P. R. China.
authors.forename: Deren
authors.initials: D
authors.lastname: Yang
keywords: 2D materials; hollow structures; hydrogenation; nanorings; ultrathin