Table 2 Specific conditions and results for the capacitors using saturated aqueous solutions of various metal perchlorate as electrolyte.

From: An aqueous electrolyte of the widest potential window and its superior capability for capacitors

Electrolyte

Separator

Operation Voltage (V)

Current density (mA cm−2)

Energy density (W h kg−1)

Power density (W kg−1)

LiClO4

CEM

3.2

10

0.42

138

Mg(ClO4)2

CEM

3.0

40

1.2

472

Ca(ClO4)2

MF

3.0

15

0.85

200

Ba(ClO4)2

MF

3.0

15

0.64

209

Al(ClO4)3

FP

2.8

20

0.81

172

  1. Graphite mixture (GA) was used in both negative and positive electrodes. CEM: Cation exchange membrane; MF: Membrane filter; FP: Paper filter.
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