Ni-Fe LDH/Reduced Graphene Oxide as Catalyst for Oxygen Evolution Reaction

doi:10.7503/cjcu20160173

Abstract

Abstract:

The composites of Ni-Fe layered double hydroxide(LDH) and reduced graphene oxide(rGO) were successfully prepared via a simple exfoliation and electrostatic self-assembly and were used as catalysts for electrooxidation of water(oxygen evolution reaction, OER). The exfoliated Ni-Fe LDH samples exhibited much higher water oxidation activity than the bulk ones. The onset potential was 1.470 V vs. RHE and the potential for maintaining a current density of 10 mA/cm² was 1.530 V vs. RHE. After being fabricated with rGO, the composite showed better performance for water oxidation than exfoliated Ni-Fe LDH, and the potential for maintaining a current density of 10 mA/cm² was decreased to 1.515 V vs. RHE.

Key words: Ni-Fe layered double hydroxide(LDH), Oxygen evolution reaction, Water-splitting, Reduced graphene oxide(rGO)

CLC Number:

O614
O646

TrendMD:

DU Shichao,REN Zhiyu,WU Jun,FU Honggang. Ni-Fe LDH/Reduced Graphene Oxide as Catalyst for Oxygen Evolution Reaction[J]. Chem. J. Chinese Universities, 2016, 37(8): 1415.

Figures/Tables 8

Fig.1 XRD patterns of Ni-Fe(1∶2) LDH(a), Ni-Fe(1∶1) LDH(b), Ni-Fe(2∶1) LDH(c), Ni-Fe(5∶1) LDH(d), Ni-Fe(10∶1) LDH(e) and β-Ni(OH)2(f)

Fig.2 Photos of colloidal solutions of exfoliated nanosheets Tyndall effect was visible when irradiated with a laserbeam. a. Ni-Fe(1∶2) LDH; b. Ni-Fe(1∶1) LDH; c. Ni-Fe(2∶1) LDH; d. Ni-Fe(5∶1) LDH; e. Ni-Fe(10∶1) LDH; f. Ni(OH)2.

Fig.3 Zeta potential(A) and TEM image(B) of Ni-Fe(10∶1) LDH The inset in (A) shows the corresponding particle size distribution.

Fig.4 Typical TEM(A, B) and HRTEM(C, D) images of the exfoliated Ni-Fe(5∶1) LDH/rGO composite (B) is the amplification image of the corresponding dotted box in (A); (C) and (D) are the amplification images of the corresponding dotted box in (B).

Fig.5 TG curves of the exfoliated Ni-Fe(5∶1)LDH/rGO composite measured under N2(a) or air(b) atomosphere

Fig.6 Polarization curves of bulk(a) and exfoliated(b) Ni-Fe(10∶1) LDH(A) and exfoliated Ni-Fe(1∶2) LDH(a), Ni-Fe(1∶1) LDH(b), Ni-Fe(2∶1) LDH(c), Ni-Fe(5∶1) LDH(d), Ni-Fe(10∶1) LDH(e), Ni(OH)2(f)(B) in 1 mol/L KOH

Fig.7 Polarization curves(A) and chronopotentiometry(B) of exfoliated Ni-Fe(10∶1) LDH(a) and NiFe(10∶1) LDH/rGO(b) The inset in (A) shows the Tafel plots; the inset in (B) shows the electrochemical impedance spectra.

Table 1 Comparison of catalytic performance of exfoliated Ni-Fe LDH/rGO to Fe,Ni-based LDHs and oxides

Material	Onset potential/ V(vs. RHE)	Potential at 10 mA·cm^-2/ V(vs. RHE)	Slope of Tafel plot/ (mV·dec^-1)	Ref.
NiFe LDH/CNT	1.500		35	[5]
Exfoliated NiFe LDH	1.493	1.532	40	[16]
NiCo LDH/CP^*	1.535	1.597	40	[17]
NG-NiCo LDH	1.580		614	[20]
CoNi LDH	1.590			[21]
NiCo LDH/Ni foam	1.520	1.650	113	[22]
Ni_2/3Fe_1/3-rGO	1.440	1.470	40	[23]
NiCo₂O₄ nanosheets	1.550		30	[24]
Ni_0.6Co_2.4O₄/Ni foil	1.570	1.760		[25]
Ni-NG	1.550		188	[26]
Exfoliated Ni-Fe LDH	1.470	1.530	108	This work
Exfoliated Ni-Fe LDH/rGO	1.470	1.515	85	This work

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