Structurally-New Hexadecanuclear Ni-Containing Silicotungstate with Catalytic Hydrogen Generation Activity
Yequn Wang1, Xing Xin1, Yeqin Feng1
1MOE Key Laboratory of Cluster Science, Beijing Key Laboratory of Photoelectroic/Electrophotonic Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 102488, China.
Molecules (Basel, Switzerland)
|March 11, 2023
Summary
A novel nickel-silicotungstate catalyst efficiently generates hydrogen using visible light. This carbon-free material shows stability and a high turnover number, offering a sustainable alternative to noble metal catalysts.
Area of Science:
- Inorganic Chemistry
- Materials Science
- Photocatalysis
Background:
- Development of efficient and sustainable catalysts is crucial for energy applications.
- Noble metal catalysts are effective but expensive and scarce.
- Silicotungstates offer tunable structures for catalytic applications.
Purpose of the Study:
- Synthesize a novel, carbon-free hexadecanuclear nickel-containing silicotungstate.
- Investigate its efficacy as a noble-metal-free catalyst for hydrogen generation.
- Elucidate the photocatalytic mechanism and assess catalyst stability.
Main Methods:
- One-pot synthesis of the nickel-silicotungstate complex.
- Characterization using single-crystal X-ray diffraction, FT-IR, and DLS.
- Visible-light-driven hydrogen evolution coupled with an iridium photosensitizer and triethanolamine.
- Evaluation of catalytic performance, stability (mercury-poisoning test), and mechanism (luminescence decay and emission quenching).
Main Results:
- Successful synthesis of a structurally new hexadecanuclear nickel-silicotungstate, [Ni16(H2O)15(OH)9(PO4)4(SiW9O34)3]19-.
- Demonstrated noble-metal-free catalytic activity for visible-light-driven hydrogen generation.
- Achieved a turnover number (TON) of 842 under optimized conditions.
- Confirmed structural stability of the catalyst during photocatalysis.
Conclusions:
- The synthesized nickel-silicotungstate is a promising, stable, and efficient catalyst for hydrogen production.
- This work provides a sustainable alternative to noble metal catalysts in photocatalysis.
- The mechanistic insights aid in designing future advanced catalytic systems.
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