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- half cell
WordNet
- partially or to the extent of a half; "he was half hidden by the bushes"
- one of two divisions into which some games or performances are divided: the two divisions are separated by an interval
- (of siblings) related through one parent only; "a half brother"; "half sister"
- consisting of one of two equivalent parts in value or quantity; "a half chicken"; "lasted a half hour"
- partial; "gave me a half smile"; "he did only a half job"
- small room in which a monk or nun lives (同)cubicle
- a device that delivers an electric current as the result of a chemical reaction (同)electric cell
- a room where a prisoner is kept (同)jail cell, prison cell
- (biology) the basic structural and functional unit of all organisms; they may exist as independent units of life (as in monads) or may form colonies or tissues as in higher plants and animals
- any small compartment; "the cells of a honeycomb"
- a small unit serving as part of or as the nucleus of a larger political movement (同)cadre
PrepTutorEJDIC
- 〈C〉〈U〉『半分』,2分の1;約半分 / 〈U〉《時刻を表す数詞と共に用いて》『半』,30分 / 〈C〉《おもに英》(2学期制の学校での)前(後)期 / 〈C〉(競技などの)前(後)半;(野球で1イニングの)表(裏) / 〈C〉=halfback / 『半分の』 / 不十分な,中途はんぱな / 『半ば』,半分[だけ] / 半時間だけ,30分だけ / 不完全に / かなり,ほとんど
- (刑務所の)『独房』;(修道院の)小さい独居室 / (ミツバチの)みつ房,巣穴 / 小さい部屋 / 『細胞』 / 電池 / 花粉室 / (共産党などの)細胞
- おや,はああ,ああ(驚き・喜び・疑い・ためらいなどを表す声)
- hectare; hectares
Wikipedia preview
出典(authority):フリー百科事典『ウィキペディア(Wikipedia)』「2015/05/19 00:37:04」(JST)
[Wiki en表示]
A half-cell is a structure that contains a conductive electrode and a surrounding conductive electrolyte separated by a naturally occurring Helmholtz double layer. Chemical reactions within this layer momentarily pump electric charges between the electrode and the electrolyte, resulting in a potential difference between the electrode and the electrolyte. The typical anode reaction involves a metal atom in the electrode dissolved and transported as a positive ion across the double layer, causing the electrolyte to acquire a net positive charge while the electrode acquires a net negative charge. The growing potential difference creates an intense electric field within the double layer, and the potential rises in value until the field halts the net charge-pumping reactions. This self-limiting action occurs almost instantly in an isolated half-cell; in applications two dissimilar half-cells are appropriately connected to constitute a Galvanic cell.
A standard half-cell, used in electrochemistry, consists of a metal electrode in a 1 molar (1 mol/L) aqueous solution of the metal's salt, at 298 kelvin (25 °C).[1] The electrochemical series, which consists of standard electrode potentials and is closely related to the reactivity series, was generated by measuring the difference in potential between the metal half-cell in a circuit with a standard hydrogen half-cell, connected by a salt bridge.
The standard hydrogen half-cell:
- 2H+(aq) + 2e− → H2(g)
The half-cells of a Daniell cell:
- Original equation
- Zn + Cu2+ → Zn2+ + Cu
- Half-cell (anode) of Zn
- Zn → Zn2+ + 2e−
- Half-cell (cathode) of Cu
- Cu2+ + 2e− → Cu
References
- ^ Andrews, Donald H.; Richard J. Kokes (1962). "Electrochemistry". Fundamental Chemistry. New York: John Wiley & Sons, Inc. p. 482.
Articles related to electrolysis / Standard electrode potential
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Electrolytic processes |
- Betts electrolytic process
- Castner process
- Castner–Kellner process
- Chloralkali process
- Downs cell
- Electrolysis of water
- Electrowinning
- Hall–Héroult process
- Hofmann voltameter
- Kolbe electrolysis
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Materials produced by electrolysis |
- Aluminium (extraction)
- Calcium metal
- Chlorine
- Copper
- Electrolysed water
- Fluorine
- Hydrogen
- Lithium metal
- Magnesium metal
- Potassium metal
- Sodium metal
- Sodium hydroxide
- Zinc
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See also |
- Electrochemistry
- Gas cracker
- Standard electrode potential (data page)
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Galvanic cells
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Types |
- Voltaic pile
- Battery
- Flow battery
- Trough battery
- Concentration cell
- Fuel cell
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Primary cell
(non-rechargable)
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- Alkaline
- Aluminium–air
- Bunsen
- Chromic acid
- Clark
- Daniell
- Dry
- Edison-Lalande
- Grove
- Leclanché
- Lithium
- Mercury
- Nickel oxyhydroxide
- Silicon–air
- Silver oxide
- Weston
- Zamboni
- Zinc–air
- Zinc–carbon
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Secondary cell
(rechargeable)
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- Automotive
- Lead–acid
- Lithium–air
- Lithium–ion
- Lithium polymer
- Lithium iron phosphate
- Lithium titanate
- Lithium–sulfur
- Dual carbon battery
- Molten salt
- Nanopore
- Nanowire
- Nickel–cadmium
- Nickel–hydrogen
- Nickel–iron
- Nickel–lithium
- Nickel–metal hydride
- Nickel–zinc
- Polysulfide bromide
- Potassium-ion
- Rechargeable alkaline
- Sodium-ion
- Sodium–sulfur
- Vanadium redox
- Zinc–bromine
- Zinc–cerium
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Cell parts |
- Anode
- Binder
- Catalyst
- Cathode
- Electrode
- Electrolyte
- Half-cell
- Ions
- Salt bridge
- Semipermeable membrane
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UpToDate Contents
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English Journal
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- Lee JW1,2, Shin HS3,4, Lee CW3, Jung KN5.
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- PMID 26831683
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- Suryawanshi A1,2, Aravindan V3, Madhavi S3,4, Ogale S5,6.
- ChemSusChem.ChemSusChem.2016 Aug 23;9(16):2193-200. doi: 10.1002/cssc.201600561. Epub 2016 Jul 12.
- Exceptional Li-ion battery performance is presented with the oxide component of the anode was extracted from red mud by simple magnetic separation and applied directly without any further processing. The extracted material has γ-Fe2 O3 as the major phase with inter-dispersed phases of Ti, Al, and S
- PMID 27403736
- Bipolar Electrochemistry for Concurrently Evaluating the Stability of Anode and Cathode Electrocatalysts and the Overall Cell Performance during Long-Term Water Electrolysis.
- Eßmann V1, Barwe S1, Masa J1, Schuhmann W1.
- Analytical chemistry.Anal Chem.2016 Aug 10. [Epub ahead of print]
- Electrochemical efficiency and stability are among the most important characteristics of electrocatalysts. These parameters are usually evaluated separately for the anodic and cathodic half-cell reactions in a three-electrode system or by measuring the overall cell voltage between the anode and cath
- PMID 27469162
Japanese Journal
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- 高レート放電時の混合正極電位計算への修正単粒子モデル適用のフィージビリティスタディ
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Related Links
- A half-cell is a structure that contains a conductive electrode and a surrounding conductive electrolyte separated by a naturally occurring Helmholtz double layer. Chemical reactions within this layer momentarily pump electric charges between ...
- Half-Cell definition, as used in chemistry, chemical engineering, and physics.
Related Pictures
![fe_half_cell.jpg](https://1mg.info/0/a/j/2080.jpg)
![half cell in the presence of a high](https://1mg.info/0/a/j/2081.jpg)
![Calcium Half-Cell ISE](https://1mg.info/0/a/j/2082.jpg)
![The half-cell reactions are:](https://1mg.info/0/a/j/2083.jpg)
![and zinc cell consists of two half-cells](https://1mg.info/0/a/j/2084.jpg)
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