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Related Concept Videos

Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Primary Active Transport01:29

Primary Active Transport

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In contrast to passive transport, active transport involves a substance being moved through membranes in a direction against its concentration or electrochemical gradient. There are two types of active transport: primary active transport and secondary active transport. Primary active transport utilizes chemical energy from ATP to drive protein pumps embedded in the cell membrane. With energy from ATP, the pumps transport ions against their electrochemical gradients—a direction they would...
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Pore Transport and Ion-Pair Transport01:17

Pore Transport and Ion-Pair Transport

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Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited  but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
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Resting Potential Decay01:15

Resting Potential Decay

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The resting membrane potential of a neuron (-70mV) is sustained due to the selective ion permeability of the membrane. At the resting potential, the membrane is slightly permeable to ions like sodium (Na+) and chloride (Cl−) and highly permeable to potassium ions (K+). Differences in the ions' concentration inside the cell compared to the outside are maintained by membrane transport proteins like channels and pumps.
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ATP Driven Pumps I: An Overview01:27

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ATP-driven pumps, also known as transport ATPases, are integral membrane proteins. They have binding sites for ATP located on the membrane's cytosolic side and the ion-conducting domain in the transmembrane region. These pumps use the free energy released from ATP hydrolysis to move the solutes across cell membranes against an electrochemical gradient.
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MOS Capacitor01:25

MOS Capacitor

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A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
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Related Experiment Video

Updated: Sep 7, 2025

Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
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Expanding the ReS2 Interlayer Promises High-Performance Potassium-Ion Storage.

Yaping Yan1, Dongbin Xiong2, Bingbing Tian1

  • 1International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, China.

ACS Applied Materials & Interfaces
|June 17, 2022
PubMed
Summary

This study enhances ReS2 anode materials for potassium-ion batteries (PIBs) by expanding interlayer distance and incorporating reduced graphene oxide (rGO). The resulting EI-ReS2@rGO nanocomposites demonstrate superior specific capacities and cycling stability for advanced energy storage.

Keywords:
electrochemistryinterlayer expandedlayered transition metal sulfidespotassium-ion storagestructural evolution

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Transition metal dichalcogenides (TMDs) face challenges in conductivity and kinetics for energy storage.
  • Rhenium disulfide (ReS2) is a promising anode material for potassium-ion batteries (PIBs).
  • Poor ion diffusion and limited cycling stability hinder ReS2 electrode performance.

Purpose of the Study:

  • To improve electrochemical kinetics and conductivity of ReS2 for PIBs.
  • To enhance the cycling stability of ReS2-based electrodes.
  • To develop advanced anode materials for next-generation energy storage systems.

Main Methods:

  • Employing an interlayer distance expanding strategy for ReS2.
  • Introducing reduced graphene oxide (rGO) to synthesize EI-ReS2@rGO composites.
  • Utilizing in situ X-ray diffraction (XRD) to investigate the K-ion storage mechanism.

Main Results:

  • Few-layered ReS2 nanosheets with expanded interlayer distance (~0.77 nm) grown on rGO.
  • EI-ReS2@rGO nanocomposites exhibited high specific capacities (432.5, 316.5, 241 mAh g-1 at 0.05, 0.2, 1.0 A g-1).
  • Demonstrated excellent reversibility at 1.0 A g-1 and intercalation/conversion K-ion storage mechanisms.

Conclusions:

  • The interlayer distance expansion and rGO incorporation strategy effectively enhances ReS2 performance in PIBs.
  • This approach offers a new avenue for optimizing TMD-based anode materials.
  • The findings contribute to the development of high-performance potassium-ion batteries.