Cobalt-containing covalent organic frameworks for visible light-driven hydrogen evolution

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  • ReceivedSep 16, 2019
  • AcceptedNov 25, 2019
  • PublishedDec 12, 2019


Funded by

the National Research Foundation Singapore(NRF2018-NRF-ANR007,POCEMON)

the Ministry of Education-Singapore(MOE,AcRF,Tier,1,R-279-000-540-114,Tier,2,MOE2018-T2-2-148)

the Agency for Science

Technology and Research(IRG,A1783c0015,IAF-PP,A1789a0024)

and the Jiangsu Overseas Visiting Scholar Program for University Prominent Young & Middle-Aged Teachers and Presidents.


This work was supported by the National Research Foundation of Singapore (NRF2018-NRF-ANR007 POCEMON), the Ministry of Education-Singapore (MOE AcRF Tier 1 R-279-000-540-114, Tier 2 MOE2018-T2-2-148), the Agency for Science, Technology and Research (IRG A1783c0015, IAF-PP A1789a0024), and the Jiangsu Overseas Visiting Scholar Program for University Prominent Young & Middle-Aged Teachers and Presidents.

Interest statement

The authors declare that they have no conflict of interest.


The supporting information is available online at http://chem.scichina.com and http://link.springer.com/journal/11426. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.


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  • Figure 1

    (a) Synthetic scheme of NUS-55; (b) powder X-ray diffraction (PXRD) patterns of NUS-55, with the simulated crystal structure of NUS-55 shown on the right; (c) left: TEM images of NUS-55 (inset: the corresponding selected-area electron diffraction (SAED) patterns). Right: HR-TEM images of NUS-55 (color online).

  • Figure 2

    (a) Schematic representation of the synthesis of NUS-55(Co) via Co(II) impregnation. (b) Comparison of the FTIR spectra of NUS-55 and NUS-55(Co). (c) N2 sorption isotherms of NUS-55 before and after Co-treatments, and NUS-55 after adsorbing [Co(bpy)3]Cl2 (filled, adsorption; open, desorption). (d) Deconvoluted XPS N 1s spectra of NUS-55 and cobalt-impregnated NUS-55(Co). (e) TEM and energy dispersive X-ray (EDX) elemental mapping images of NUS-55(Co) (color online).

  • Figure 3

    (a) Emission spectra of NUS-55 (2.65 μM) suspension in 1:1 EtOH/H2O upon addition of [Co(bpy)3]Cl2. (b) PXRD patterns of NUS-55 before and after 3 and 5 cycles of catalytic reactions. (c) Comparison of H2 generation between NUS-55(Co) and NUS-55 suspension containing 8.4 μM of [Co(bpy)3]Cl2. (d) Time dependence of H2 production of the system with NUS-55(Co) upon adding a fresh solution of TEA (5%, v/v) every 2.5 h or NUS-55/[Co(bpy)3]Cl2 upon adding a fresh solution of [Co(bpy)3]Cl2 (8.4 μM) and TEA (5%, v/v) every 4 h, respectively. (e) FTIR spectra of [Co(bpy)3]Cl2 (top), NUS-55 obtained after the absorption of [Co(bpy)3]Cl2 (middle), and pure NUS-55 (bottom). (f) Scheme of the interaction between NUS-55 and [Co(bpy)3]Cl2 computed using density functional theory (DFT) calculations (color online).


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