nanoporous nif 2 for energy storage
DESCRIPTION
Nanoporous NiF 2 for energy storage. Yang Yang and James M. Tour Department of Chemistry, Smalley Institute for Nanoscale Science and Technology, Rice University http://www.jmtour.com/ [email protected] and [email protected]. Device fabrication process. (iv) anodization - PowerPoint PPT PresentationTRANSCRIPT
Nanoporous NiF2 for energy storage
Yang Yang and James M. Tour
Department of Chemistry, Smalley Institute for Nanoscale
Science and Technology, Rice University
http://www.jmtour.com/
Device fabrication process
(i) plasma treatment (ii) sputter Cr/Au (iii) electrodeposit metal layer
(iv) anodizationto form porous layer
(v) preparation of solid electrolyte
(vi) supercapacitor device assembly
(vii) ready for testing
b c
a
200 nm
~ 900 nm
a
200 nm
b
200 nm
c d
d110 = 0.32 nm
-0.8 -0.4 0.0 0.4 0.8
-20
-10
0
10
20 10 V s-1
20 V s-1
50 V s-1
100 V s-1
Potential (V)
Curr
ent (
mA)
a
0 5 10 15 20 25
-0.8
-0.4
0.0
0.4
0.8
Time (s)
Pote
ntia
l (V)
b
-1.5 -1.0 -0.5 0.0 0.5 1.0 1.5-20
-10
0
10
20 10 mV s-1
20 mV s-1
Potential (V)
Curr
ent (m
A)
c
0 200 400 600 800-1.5
-1.0
-0.5
0.0
0.5
1.0
1.5
Time (s)
Pote
ntia
l (V)
d
Double layer capacitor: 0.29 mF cm-2 (3.2 F cm-3 or 1.57 F g-1), energy density of 0.6 Wh kg-1 and power density of 8 kW kg-1 Pseudocapacitor: 66 mF cm-2 (733 F cm-3 or 358 F g-1), energy density of 384 Wh kg-1 and power density of 112 kW kg-1
Ni(OH)2 + OH- NiOOH + H2O + e-
NiF2 + 2OH- Ni(OH)2 + 2F-
Proposed charge storage mechanism :
Advantages of nanoporous NiF2
1. Wide operation potential window – high energy density
2. Long term stability – reliable performance
3. Li-free, battery-like supercapacitors – works easily
4. Can be used for Ni-Cd and Ni-MH batteries
5. Easy fabrication – only needs a power source
6. Can be grown on any substrates, any shapes, any sizes