Title: Phase-Selective Epitaxial Growth of Heterophase Nanostructures on Unconventional 2H-Pd Nanoparticles

Abstract

Heterostructured, including heterophase, noble-metal nanomaterials have attracted much interest due to their promising applications in diverse fields. However, great challenges still remain in the rational synthesis of well-defined noble-metal heterophase nanostructures. Furthermore, we report the preparation of Pd nanoparticles with an unconventional hexagonal close-packed (2H type) phase, referred to as 2H-Pd nanoparticles, via a controlled phase transformation of amorphous Pd nanoparticles. Impressively, by using the 2H-Pd nanoparticles as seeds, Au nanomaterials with different crystal phases epitaxially grow on the specific exposed facets of the 2H-Pd, i.e., face-centered cubic (fcc) Au (fcc-Au) on the (002)h facets of 2H-Pd while 2H-Au on the other exposed facets, to achieve well-defined fcc-2H-fcc heterophase Pd@Au core–shell nanorods. Moreover, through such unique facet-directed crystal-phase-selective epitaxial growth, a series of unconventional fcc-2H-fcc heterophase core–shell nanostructures, including Pd@Ag, Pd@Pt, Pd@PtNi, and Pd@PtCo, have also been prepared. Impressively, the fcc-2H-fcc heterophase Pd@Au nanorods show excellent performance toward the electrochemical carbon dioxide reduction reaction (CO₂RR) for production of carbon monoxide with Faradaic efficiencies of over 90% in an exceptionally wide applied potential window from –0.9 to –0.4 V (versus the reversible hydrogen electrode), which is among the best reported CO₂RR catalysts in H-type electrochemical cells.

Authors:

Ge, Yiyao ^[1]; Huang, Zhiqi ^[1]; Ling, Chongyi  ^[2];

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• Search DOE PAGES for ORCID "0000-0002-4126-9036"

Chen, Bo  ^[1];

• Search DOE PAGES for author "Chen, Bo"
• Search DOE PAGES for ORCID "0000-0001-6743-9251"

Liu, Guigao  ^[2];

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• Search DOE PAGES for ORCID "0000-0002-0018-1249"

Zhou, Ming ^[3]; Liu, Jiawei ^[3]; Zhang, Xiao ^[1]; Cheng, Hongfei ^[3]; Liu, Guanghua ^[4]; Du, Yonghua ^[5]; Sun, Cheng-Jun ^[6]; Tan, Chaoliang  ^[2];

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• Search DOE PAGES for ORCID "0000-0003-1695-5285"

Huang, Jingtao ^[3]; Yin, Pengfei ^[2]; Fan, Zhanxi  ^[2];

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• Search DOE PAGES for ORCID "0000-0003-3133-6503"

Chen, Ye  ^[7];

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• Search DOE PAGES for ORCID "0000-0003-0821-7469"

Yang, Nailiang  ^[8];

• Search DOE PAGES for author "Yang, Nailiang"
• Search DOE PAGES for ORCID "0000-0002-5708-8379"

Zhang, Hua ^[9]

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+ Show Author Affiliations

1. City Univ. of Hong Kong (China); Nanyang Technological Univ. (Singapore)
2. City Univ. of Hong Kong (China)
3. Nanyang Technological Univ. (Singapore)
4. Tsinghua Univ., Beijing (China)
5. Brookhaven National Lab. (BNL), Upton, NY (United States)
6. Argonne National Lab. (ANL), Argonne, IL (United States)
7. Chinese Univ. of Hong Kong (China)
8. Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China)
9. City Univ. of Hong Kong (China); City Univ. of Hong Kong (China)

Publication Date:

Wed Oct 21 00:00:00 EDT 2020

Research Org.:

Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Org.:

USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division

OSTI Identifier:

1798516

Grant/Contract Number:  

AC02-06CH11357

Resource Type:

Accepted Manuscript

Journal Name:

Journal of the American Chemical Society

Additional Journal Information:

Journal Volume: 142; Journal Issue: 44; Journal ID: ISSN 0002-7863

Publisher:

American Chemical Society (ACS)

Country of Publication:

United States

Language:

English

Subject:

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Nanomaterials; Metal nanoparticles; Epitaxy; Nanoparticles; Nanorods