This document discusses different types of electrodes that are reversible with respect to hydrogen ions (H+ ions). It specifically describes the reversible hydrogen electrode (RHE), standard hydrogen electrode, glass electrode, and quinhydrone electrode. The RHE acts as both an anode and cathode and follows the Nernst equation. It involves the reversible reaction of H+ ions and electrons producing hydrogen gas. The standard hydrogen electrode provides the standard potential of 0 volts under specific temperature and pressure conditions. Glass electrodes are commonly used to measure pH based on the Nernst equation. Quinhydrone electrodes also follow the Nernst equation and can act as either an anode or cathode under acidic conditions.

1. Name: Mishuk Biswas
Student
ELECTRODE REVERSIBLE WITH
RESPECT TO H+ ION

2. ELECTRODES REVERSIBLE WITH RESPECT
TO H+ ION
Reversible hydrogen electrode
Quinhydrone electrode
Glass electrode
Since they act both anode as well as cathode, they are
called reversible electrodes

3. REFERENCE ELECTRODE
An electrode having an accurately maintained
potential ;
It is used as a reference for measurement by
other electrodes.
IDEAL REFERENCE ELECTRODE
▪ Reversible and obeys the Nernst equation
▪ Exhibits a potential that is constant with time
▪ Little hysteresis with temperature cycling

4. REVERSIBLE HYDROGEN ELECTRODE
A reversible hydrogen electrode (RHE) is a
Reference electrode
Since it can act both
anode as well as
cathode, it is called
a reversible electrode
H+(aq )+𝐞− ⇌
𝟏
𝟐
𝐇𝟐(g)

5. STANDARD HYDROGEN ELECTRODE
Conditions
Pressure: 1atm
H+ ion conc. : 1M
Temperature: 25o C
Potential E0= 0 volt.

6. REVERSIBLE HYDROGEN ELECTRODE
2H+(aq )+𝟐𝐞−
⇌ 𝐇𝟐(g)
𝑬 = 𝑬𝟎 −
𝑹𝑻
𝒏𝑭
𝒍𝒏
𝒇(𝑯𝟐)/𝒑𝟎
𝒂(𝑯+)
Nernst equation for this cell:

7. REVERSIBLE HYDROGEN ELECTRODE
2H+(aq )+𝟐𝐞− ⇌
𝟏
𝟐
𝐇𝟐(g)
𝐄 = 𝑬𝟎 −
𝑹𝑻
𝑭
𝒍𝒏
𝒇(𝑯𝟐)/𝒑𝟎
𝒂(𝑯+)

8. DESIGN OF A RHE

9. INDICATOR ELECTRODE
 potential depends on the activity of ions being
titrated or estimated
 used to sense the presence or change in
concentration of the oxidized and reduced forms of
a redox couple

10. GLASS ELECTRODE
 Glass electrodes are commonly used for pH
measurements
2H+(aq )+𝟐𝐞−
⇌
𝟏
𝟐
𝐇𝟐(g)
Nernst equation for this cell:
𝐄glass = 𝑬𝟎(glass) −
𝟎. 𝟎𝟓𝟗𝟏
𝟐
𝒍𝒐𝒈
𝐇𝟐
𝑯+ 𝟐
𝐄glass = 𝑬𝟎(glass) − 𝟎. 𝟎𝟓𝟗𝟏 𝒑𝑯

11. QUINHYDRONE ELECTRODE
Eo = 0.699 V
Nernst equation for this reaction can be written as
𝐄Quinhydrone = 𝑬𝟎(quin.) − 𝟎. 𝟎𝟓𝟗𝟏 𝒑𝑯

12. QUINHYDRONE ELECTRODE
Acidic Condition
Quinhydrone – cathode
Calomel – anode
Acidic Condition
Quinhydrone – anode
Calomel – cathode

13. APPLICATIONS
• RHE is the basic guide for the reporting of
the potential of half-cells
• It is a type of gas electrode and has been
commonly used as a reference electrode
• Glass electrodes are commonly used for pH
measurements
• Quinhydrone is used in potentiometric
titration

14. ACKNOWLEDGEMENT
https://pubs.acs.org/d
oi/10.1021/acscatal.0
c02046
https://en.wikipedia.o
rg/wiki/Reversible_hy
drogen_electrode
https://www.toppr.co
m/ask/en-
bd/question/what-is-
standard-hydrogen-
electrode/
https://www.research
gate.net/publication/3
07883774_Constructi
on_of_a_Novel_Reve
rsible_Hydrogen_Ele
ctrode_RHE
Thank You

15. FAQ SLIDE
2H+(aq )+𝟐𝐞− ⇌
𝟏
𝟐
𝐇𝟐(g)
𝐇𝟐O + 𝐞− ⇌
𝟏
𝟐
𝐇𝟐(g) + OH−