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Related Concept Videos

Diffusion01:12

Diffusion

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Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
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Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
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Self-help support groups are voluntary, community-based organizations that provide a platform for individuals with shared concerns to exchange support, insights, and practical strategies for coping with life challenges. Typically led by group members or paraprofessionals, these groups form a cornerstone of mental health care, especially in reaching populations that are underserved by traditional healthcare systems.
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Standard Electrode Potentials03:02

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On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
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A coplanar force system refers to a set of forces that all lie in the same plane and are subject to different reactions between the point of contact and the supports. Understanding how different types of supports affect coplanar forces is crucial for designing safe and reliable structures that can withstand external loads.
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The plasma membrane, a critical structure in cellular biology, houses an array of transporters, or carrier proteins, interspersed within its lipid bilayer. These proteins play a crucial role in solute transport through facilitated diffusion, a form of passive diffusion that uses transporters to move the molecules across the membrane.
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Confinement-Enhanced Rapid Interlayer Diffusion within Graphene-Supported Anisotropic ReSe2 Electrodes.

Zhenjing Liu1, Xuewu Ou1, Minghao Zhuang1

  • 1Department of Chemical and Biological Engineering, William Mong Institute of Nano Science and Technology and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction , The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon 999077 , Hong Kong.

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Engineered rhenium diselenide (ReSe2) nanosheets on 3D graphene foam enhance lithium-ion battery anode performance and hydrogen evolution reaction catalysis. This 3D structure facilitates faster lithium diffusion for improved energy storage and catalytic applications.

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DFTanisotropic structurehydrogen evolution reactionlithium ion batteryrhenium diselenides

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Efficient energy storage and conversion are critical for sustainable technologies.
  • Lithium-ion batteries (LIBs) require advanced anode materials for enhanced performance.
  • Hydrogen evolution reaction (HER) catalysts are essential for clean hydrogen production.

Purpose of the Study:

  • To develop novel electrode materials for improved lithium-ion battery anodes.
  • To engineer catalysts for efficient hydrogen evolution reaction (HER).
  • To understand and enhance interlayer lithium diffusion in transition-metal dichalcogenides (TMDs).

Main Methods:

  • Epitaxial growth of ReSe2 nanosheets on 3D graphene foam via chemical vapor deposition.
  • Density functional theory (DFT) calculations to investigate lithium diffusion barriers.
  • Electrochemical testing for LIB anode performance (cycling, rate capability).
  • Electrochemical evaluation of HER catalytic activity.

Main Results:

  • 3D ReSe2/graphene foam electrodes exhibited excellent cycling stability (99.6% retention after 350 cycles).
  • High rate capability was achieved with a capacity of 327 mA h g-1 at 1000 mA g-1.
  • The material demonstrated high HER activity with an exchange current density of 277.8 μA cm-2 and low overpotential (106 mV at -10 mA cm-2).

Conclusions:

  • The engineered 3D ReSe2/graphene foam structure significantly enhances interlayer lithium diffusion.
  • This material shows great promise as a high-performance anode for LIBs and an efficient catalyst for HER.
  • The findings offer fundamental insights into Li diffusion in TMDs and a new avenue for designing advanced catalysts.