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Related Concept Videos

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There are two ways to determine the amount of heat involved in a chemical change: measure it experimentally, or calculate it from other experimentally determined enthalpy changes. Some reactions are difficult, if not impossible, to investigate and make accurate measurements for experimentally. And even when a reaction is not hard to perform or measure, it is convenient to be able to determine the heat involved in a reaction without having to perform an experiment.
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Following the work of Ernest Rutherford and his colleagues in the early twentieth century, the picture of atoms consisting of tiny dense nuclei surrounded by lighter and even tinier electrons continually moving about the nucleus was well established. This picture was called the planetary model since it pictured the atom as a miniature “solar system” with the electrons orbiting the nucleus like planets orbiting the sun. The simplest atom is hydrogen, consisting of a single proton as the...
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The electron of an atom can be abstracted from a compound by a relatively unstable radical to generate a new radical of relatively greater stability. For example, an initiator which forms radicals by homolysis can abstract a suitable species like a hydrogen atom or a halogen atom from a compound to generate a new radical. This ability of radicals to propagate by abstraction is a crucial feature of radical chain reactions.
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Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
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A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
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Hydrogen evolution based on the electrons/protons stored on amorphous TiO2.

Shuwen Zeng1, Ling Zhang, Wenzhong Wang

  • 1State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, P. R. China. lingzhang@mail.sic.ac.cn wzwang@mail.sic.ac.cn.

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Summary
This summary is machine-generated.

Researchers developed a recyclable TiO2 mediator with MoS2 catalyst for efficient solar hydrogen production. This system stores and transfers proton-electron pairs, enabling dark hydrogen evolution with 80% electron utilization.

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Area of Science:

  • Materials Science
  • Catalysis
  • Renewable Energy

Background:

  • Solar energy conversion is crucial for sustainable hydrogen production.
  • Recyclable mediators are explored to improve efficiency in solar-driven reactions.
  • Proton-coupled electron transfer (PCET) is a key process in catalytic hydrogen evolution.

Purpose of the Study:

  • To introduce a novel catalyst mediator system for efficient hydrogen evolution reaction (HER).
  • To enable proton-electron pair storage and transfer for dark hydrogen production.
  • To investigate the role of MoS2 and TiO2 in facilitating PCET for solar energy conversion.

Main Methods:

  • Utilized molybdenum disulfide (MoS2) as a catalyst mediator.
  • Employed recyclable titanium dioxide (TiO2) for proton-electron storage (H+-TiO2/e-).
  • Investigated dark and light-excited electron transfer rates from TiO2 to MoS2.

Main Results:

  • Achieved 80% utilization of stored electrons on TiO2 for H+ reduction to H2 on MoS2 in the dark.
  • Demonstrated efficient electron transfer to MoS2 at rates of 455 μmol h-1 g-1 (dark) and 947 μmol h-1 g-1 (excited state).
  • Established a new pathway for hydrogen evolution using recyclable proton-electron pairs.

Conclusions:

  • The MoS2/TiO2 system offers a promising route for solar-driven hydrogen production.
  • The PCET mechanism on recyclable H+-TiO2/e- facilitates efficient dark hydrogen evolution.
  • This approach provides a novel strategy for storing and utilizing solar energy for fuel generation.