Electronic Supplementary Information

Nanocrystalline Copper-Chromium-Layered Double Hydroxide with Tunable

Interlayer Anions for Supercapacitor Application

Akash S. Patil,1 Jayavant L. Gunjakar,2 Chandrakant D. Lokhande,2* Mahesh M.

Wagh,1 Jaydeep S. Bagi1*

1Energy Technology Division, Department of Technology, Shivaji University, Vidyanagar,

Kolhapur-416004, (India).

2Centre for Interdisciplinary Research, D. Y. Patil Education Society (Institution Deemed To

Be University), Kolhapur, 416 006, MS, India.

Corresponding author footnote*

Prof. Jaydeep S. Bagi, Email: jaysbagi@gmail.com, Tel: +91 9850441874

Prof Chandrakant. D. Lokhande, Email: l_chandrakant@yahoo.co.in, Tel: +91 9765788816

Fig. S1. HR-TEM images of (a, b, c, d) of CuCr-N sample at various magnifications.

Fig. S2. CV curves of CuCr-C supercapacitor electrode at different scan rates ranging from 10 to 100 mVs-1.

Fig. S3. GCD curves of CuCr-N supercapacitor electrode at current densities of 1 to 5 Ag-1

Fig. S4. GCD curves of CuCr-C supercapacitor electrode at current densities of 1 to 5 Ag-1

Fig. S5. Variations of the specific capacitance of (red) CuCr-N and (black) CuCr-C supercapacitor electrode with current density.

Sr.

No.

Materials Electrode Composition /Electrolyte/Current collector

Maximum Specific

Capacitance

(F g-1)

Stability retention (Cyclic

number)

Ref.

1 Cu(OH)2 thin films by CBD Cu(OH)2 thin films/ 1M NaOH/ stainless steel substrate

120 F g-1

(10 mVs-1)

-- 1

2 Cu(OH)2 arrays on copper foil surface oxidation method

Nanowire-like Cu(OH)2 arrays/ 1M KOH/ copper foil

511 F g-1 83% (5000) 2

(1 Ag-1)

3 CuO nanowires by polymeric electrospinning method

CuO nanowires / 6M KOH/ nickel foam 620 F g-1

(2 Ag-1)

98% (2000) 3

4 Cu(OH)2 nanostructure by electric field enhanced wet

chemical method

Cu(OH)2 / 1 M NaOH/ copper foil 178 F g-1

(20 mVs-1)

-- 4

5 3D highly ordered nanoporous CuO by hydrothermal method

nanoporous CuO / 3 M KOH/ nickel foam 431 F g-1

(3.5 mA cm-2)

93% (3000) 5

6 CuO nanowire arrays (NWAs) CuO NWAs / PVA-KOH solid electrolyte/ copper wire substrate

694 F g-1

(2.5 mA cm–2)

99.5% (2000) 6

7 CuO nanostructures by surface oxidation method

CuO hierarchical nanostructures thin film/ 1 M KOH/ copper foam

807 mFcm-2

(1 Ag-1)

79% (10000) 7

8 Cu(OH)2 nanorods by surface oxidation method

Cu(OH)2 nanorods thin film/ 5 M NaOH/ copper foam

1.7 Fcm-2

(2 mA cm-2)

97.3% (5000) 8

9 Cu2O-Cu(OH)2 -graphene by electrodeposition method

Cu2O-Cu(OH)2 – graphene / 0.5 M Na2SO4 / stainless steel substrate

425 F g-1

(5 Ag-1)

87% (2000) 9

10 Cu–Cu(OH)2/RGO by electrophoretic deposition

Cu–Cu(OH)2/RGO / 0.5 M NaNO3 / stainless steel substrate

492 F g-1

(5 Ag-1)

97% (500) 10

11 3D Cu(OH)2 nanoporous nanorods by anodization

process

Cu(OH)2 nanoporous nanorods / 2 g PVA+1.12 g KOH gel electrolyte / copper

foil substrate

802 F g-1

(5 mVs-1)

92% (5000) 11

12 Cu(OH)2@RGO by hydrothermal method

Cu(OH)2@RGO/ 1 M KOH/ nickel foam 602 F g-1

(0.2 Ag-1)

45% (2000) 12

13 CuO/ Cu(OH)2 hybrid thin films by SILAR method

CuO/ Cu(OH)2 hybrid thin films/ 2 M KOH/ stainless steel substrate

459 F g-1

(5 mVs-1 )

88 % (2000) 13

14 CuCr-LDH-NO3 by chemical coprecipitation method

CuCr-LDH-NO3/ 2 M KOH/ stainless steel substrate

843 F g-1

(1 Ag-1)

85% (1500) Present work

Table S1. Brief literature survey of electrochemical data of CuO and Cu(OH)2 based

electrodes

Sr.

No.

Materials Electrode Composition /Electrolyte/Current collector

Maximum Specific

Capacitance

(F g-1)

Stability retention (Cyclic

number)

Ref.

1 CoAl-LDH by direct coprecipitation method

CoAl-LDH / 1 M KOH/ nickel foam 145 F g-1

(2 Ag-1)

- 14

2 CoAl-LDH/rGO composite by simple refluxing method

GNS/CoAl-LDH composite/6 M KOH/ nickel foam

712 F g-1

(1 Ag-1)

100% (6000) 15

3 CoAl-LDH/CF composite by in situ hydrothermal method

CoAl-LDH composite/ 1.0 M LiOH/ flexible carbon fibers

442 F g-1

(1 Ag-1)

98.2% (6000) 16

4 CoAl-LDH by hydrothermal synthesis method

CoAl-LDH nanoflake arrays/ 2 M KOH/ nickel foam

742 F g-1

(4 Ag-1)

88.9% (2000) 17

5 NiAl LDH by hydrothermal synthesis method

NiAl LDH NPAs hybrid / 1 M KOH/ conductive fabric

627 F g-1

(2 mVs-1 )

88.9% (2000) 18

6 NiAl-LDH/rGO composite by liquid phase deposition method

GNS/ NiAl-LDH hybrid /6 M KOH/ nickel foam

869 F g-1

(1 Ag-1)

106% (1500) 19

7 NiAl-LDH by in situ growth method

NiAl-LDH /6 M KOH/ nickel foam 701 F g-1

(10 mA cm-2)

94% (4000) 20

8 NiCo-LDH/NF composite by coprecipitation method

NiCo-LDH/NF composite/ 6 M KOH/ nickel foam

804 F g-1

(3 Ag-1)

-- 21

9 NiCo-LDH grown on CNTs by CBD method

NiCo-LDH@CNTs / 1 M KOH/ stainless steel substrate

502 F g-1

(10 mA cm-2)

83% (5000) 22

10 NiCo-LDH/ CNTs composite by thermal chemical vapor

deposition method

NiCo-LDH@CNTs/ 1 M KOH/ nickel foam

762 F g-1

(1 Ag-1)

78% (1200) 23

11 CoNi-LDH/ rGO composite by direct heterostaching approach

CoAl-LDH@rGO/ 1 M KOH/ graphene 650 F g-1

(5 Ag-1)

97% (2000) 24

12 CoNiAl-LDH/carbon nanohybrids composite

CoNiAl-LDH /1 M KOH/ carbon black 501 F g-1

(5 Ag-1)

91% (1000) 25

13 CuCr-LDH-NO3 by chemical coprecipitation method

CuCr-LDH-NO3/ 2 M KOH/ stainless steel substrate

843 F g-1

(1 Ag-1)

85% (1500) Present work

Table S2. Summary of LDH-based materials and their electrochemical performances.

Electrode Rs

(Ωcm-2)

Rct (R1+R2)

(Ωcm-2)

Q1

(F)

Q2

(F)

W

(Ωcm-2)

CuCr-N 0.46 6.14 0.05187 1.5429 0.02457

CuCr-C 0.59 7.26 0.02516 1.8972 0.04905

Table S3. Electrochemical impedance spectroscopic fitted circuit parameters

10 20 30 40 50 60 70

(110

)

(009

)(006

)

In

tens

ity (a

.u.)

2

(003

)

Fig. S6. Powder XRD patterns of CuCr-N supercapacitor electrodes before (black)

and after (red) CV stability cycles.

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