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Related Concept Videos

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation01:28

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

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Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
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Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions
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Amorphous NiCoB-coupled MAPbI3 for efficient photocatalytic hydrogen evolution.

Lanxuan Jiang1, Yanmei Guo1, Shaopeng Qi1

  • 1School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, P.R. China. lou@seu.edu.cn.

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|December 2, 2021
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Summary

Researchers developed a novel composite photocatalyst, NiCoB/MAPbI₃, significantly boosting hydrogen evolution. This advanced material shows over 100 times greater efficiency than the base perovskite, offering a promising solution for clean hydrogen production.

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Area of Science:

  • Materials Science
  • Photocatalysis
  • Renewable Energy

Background:

  • Organic-inorganic hybrid perovskite MAPbI₃ shows potential for visible light photocatalysis.
  • The hydrogen evolution reaction (HER) efficiency of MAPbI₃ is currently limited.
  • Developing efficient cocatalysts is crucial for enhancing perovskite-based photocatalysts.

Purpose of the Study:

  • To synthesize a novel composite photocatalyst for improved hydrogen evolution.
  • To investigate the synergistic effects of NiCoB and MAPbI₃ in photocatalysis.
  • To evaluate the efficiency and stability of the developed composite material.

Main Methods:

  • Amorphous NiCoB synthesized via a redox method.
  • NiCoB/MAPbI₃ composite photocatalyst fabricated using electrostatic self-assembly.
  • Photocatalytic hydrogen evolution reaction (HER) performance and stability tested.

Main Results:

  • The 30% NiCoB/MAPbI₃ composite achieved a maximum H₂ generation yield of 2625.57 μmol g⁻¹ h⁻¹.
  • This yield is approximately 114-fold higher than pristine MAPbI₃ and superior to Pt/MAPbI₃.
  • The NiCoB/MAPbI₃ composite demonstrated excellent stability over a 24-hour cycling test.

Conclusions:

  • NiCoB acts as an effective cocatalyst, significantly enhancing charge separation in MAPbI₃.
  • The NiCoB/MAPbI₃ composite exhibits superior photocatalytic HER activity and stability.
  • This study provides a valuable reference for designing efficient lead halide perovskite-based photocatalysts.