
434 Electrochemically Enabled Sustainability
TABLE 11.1 (continued)
Half-Cell Reactions of Common Aqueous Power Sources
Cell Anode (or Negative) Half-Cell Cathode (or Positive Half-Cell) Electrolyte OCV
(b) Electrodes with Weak or No Sensitivity to pH
Daniell cell (primary
battery)
Zn(s) → Zn
2+
(aq) + 2e
−
E
0
= 0.76 V
Cu
2+
(aq) + 2e
−
→ Cu(s)
E
0
= 0.34 V
ZnSO
4
/CuSO
4
(acid)
1.1 V
Leclanché or dry cell
(primary battery)
Zn(s) → Zn
2+
(aq) + 2e
−
E
0
= 0.76 V
(aq) + MnO
2
(s) + e
−
→ NH
3
(aq)
+ MnO(OH)(s) E
0
= 0.74 V
Paste of NH
4
Cl +
ZnCl
2
(acid)
1.5 V
Vanadium poly-halide
ow battery (1.3 V)
V
2+
→ V
3+
+ e
−
E
0
= 0.26 V
½Br
2
+ e
−
→ Br
−
E
0
= 1.09 V
VCl
3
-HCl/
NaBr-HCl (acid) ...