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In Situ Phosphatizing of Triphenylphosphine Encapsulated within Metal–Organic Frameworks to Design Atomic Co1–P1N3 Interfacial Structure for Promoting Catalytic Performance

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.0c02229· OSTI ID:1638159
 [1];  [2];  [3];  [4];  [3];  [4];  [5];  [5];  [6];  [6];  [3];  [3];  [4];  [3];  [1];  [1]
  1. Tsinghua Univ., Beijing (China)
  2. Stanford Univ., CA (United States). SUNCAT Center for Interface Science and Catalysis
  3. Beijing Inst. of Technology (China). Beijing Key Lab. of Construction Tailorable Advanced Functional Materials and Green Applications
  4. Beijing Univ. of Chemical Technology (China)
  5. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of High Energy Physics (IHEP). Beijing Synchrotron Radiation Facility
  6. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)

The engineering coordination environment offers great opportunity in performance tunability of isolated metal single-atom catalysts. For the most popular metal–Nx (MNx) structure, the replacement of N atoms by some other atoms with relatively weak electronegativity has been regarded as a promising strategy for optimizing the coordination environment of an active metal center and promoting its catalytic performance, which is still a challenge. Herein, we proposed a new synthetic strategy of an in situ phosphatizing of triphenylphosphine encapsulated within metal–organic frameworks for designing atomic Co1–P1N3 interfacial structure, where a cobalt single atom is costabilized by one P atom and three N atoms (denoted as Co-SA/P-in situ). In the acidic media, the Co-SA/P-in situ catalyst with Co1–P1N3 interfacial structure exhibits excellent activity and durability for the hydrogen evolution reaction (HER) with a low overpotential of 98 mV at 10 mA cm–2 and a small Tafel slope of 47 mV dec–1, which are greatly superior to those of catalyst with Co1–N4 interfacial structure. We discover that the bond-length-extended high-valence Co1–P1N3 atomic interface structure plays a crucial role in boosting the HER performance, which is supported by in situ X-ray absorption fine structure (XAFS) measurements and density functional theory (DFT) calculation. With this work, we hope to promote the development of high performance metal single-atom catalysts.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE; National Key R&D Program of China; National Natural Science Foundation of China; Beijing Institute of Technology
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1638159
Journal Information:
Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 18 Vol. 142; ISSN 0002-7863; ISSN 1520-5126
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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