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Related Concept Videos

Common Ion Effect03:24

Common Ion Effect

47.0K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
47.0K
Precipitation of Ions03:11

Precipitation of Ions

30.3K
Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
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Ion Channels01:19

Ion Channels

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The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
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Formation of Complex Ions03:45

Formation of Complex Ions

26.2K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Ions and Ionic Charges03:27

Ions and Ionic Charges

79.2K
In ordinary chemical reactions, the nucleus — which contains the protons and neutrons of each atom and thus identifies the element — remains unchanged. Electrons, however, can be added to atoms by transfer from other atoms, lost by transfer to other atoms, or shared with other atoms. The transfer and sharing of electrons among atoms govern the chemistry of the elements. During the formation of some compounds, atoms gain or lose electrons to form electrically charged particles called...
79.2K
Ions as Acids and Bases02:54

Ions as Acids and Bases

26.6K
Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
26.6K

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T-Nb2O5 nanoparticle enabled pseudocapacitance with fast Li-ion intercalation.

Lingping Kong1, Xiaoteng Liu2, Jinjia Wei1

  • 1School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an 710049, China. feichen@xjtu.edu.cn.

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Researchers created orthorhombic niobium pentoxide (T-Nb2O5) nanoparticles using a self-assembly method. These nanoparticles show excellent lithium-ion intercalation kinetics and rate capability for energy storage technologies.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Niobium pentoxide (Nb2O5) is a promising material for electrochemical energy storage.
  • Controlling the morphology of Nb2O5 is crucial for optimizing its electrochemical performance.
  • Evaporation Induced Self-Assembly (EISA) offers a route to nanostructure materials.

Purpose of the Study:

  • To fabricate orthorhombic Nb2O5 (T-Nb2O5) nanocrystallites using EISA.
  • To investigate the effect of Pluronic F127 concentration on T-Nb2O5 morphology.
  • To evaluate the electrochemical performance of T-Nb2O5 nanoparticles for Li-ion intercalation.

Main Methods:

  • Synthesis of T-Nb2O5 using EISA with Pluronic F127.
  • Morphological characterization of T-Nb2O5 structures.
  • Electrochemical testing including cyclic voltammetry and galvanostatic charge-discharge.

Main Results:

  • Morphology transition from nanofilms to monodisperse nanoparticles achieved by varying Pluronic F127 content.
  • Optimized 20 nm T-Nb2O5 nanoparticles (Nb-2) exhibited superior Li-ion intercalation kinetics.
  • Nb-2 demonstrated high initial capacities (528 C g⁻¹ at 0.5 A g⁻¹) and stable cycling (499 C g⁻¹ after 300 cycles, 380 C g⁻¹ after 1000 cycles).

Conclusions:

  • Copolymer-guided EISA enables controlled synthesis of T-Nb2O5 nanoparticles.
  • Monodisperse T-Nb2O5 nanoparticles offer enhanced electrochemical performance compared to porous nanofilms.
  • This approach holds potential for developing advanced materials for electrochemical energy storage (EES) devices.