Preparation and Electrochemical Evaluation of MoS2/graphene as a Catalyst for Hydrogen Evolution in Microbial Electrolysis Cell†

doi:10.7503/cjcu20170255

Abstract

Abstract:

A series of MoS₂/graphene(MoS₂/Gr) composites was prepared via simple hydrothermal method, and loaded on the carbon-based electrode. The as-prepared samples were characterized by scanning electron microscopy, transmission electron microscopy, linear sweep voltammetry, and so on. The hydrogen evolution performance of MoS₂/Gr electrode as the cathode of microbial electrolysis cell(MEC) was studied. The results showed that the MoS₂/Gr materials held a three-dimensional layered structure, and the molybdenum sulfide loaded on graphene was amorphous MoS₂. The composite prepared from 50%(mass fraction) (NH₄)₂MoS₄ and 50%(mass fraction) graphene oxide with a surface density of 1.5 mg/cm² exhibited the best catalytic activity for hydrogen evolution reaction. In the MEC tests, the MoS₂/Gr cathode was comparable with the Pt/C cathode in term of energy efficiency. The average current density of hydrogen production, hydrogen production rate, coulomb efficiency, hydrogen recovery and cathodic hydrogen recovery obtained with MoS₂/Gr cathode MEC were (9.96±0.65) A/m², (0.424±0.041) m³H₂/(m³·d), (89.11±5.87)%, (70.47±6.78)% and (78.86±2.49)%, respectively, higher than those obtained with the Pt/C cathode MEC. In addition, the MoS₂/Gr cathode exhibited good stability, and it was inexpensive. These advantages make it suitable for practical application.

Key words: MoS2/graphene, Carbon-based electrode, Microbial electrolysis cell, Hydrogen production

CLC Number:

O646
O614

TrendMD:

DAI Hongyan, YANG Huimin, LIU Xian, JIAN Xuan, GUO Minmin, CAO Lele, LIANG Zhenhai. Preparation and Electrochemical Evaluation of MoS₂/graphene as a Catalyst for Hydrogen Evolution in Microbial Electrolysis Cell^†[J]. Chem. J. Chinese Universities, 2018, 39(2): 351.

Figures/Tables 8

Table 1 Material ratio for MoS2/Gr composites

Serial number	m(GO)/mg	m[(NH₄)₂MoS₄]/mg	V(HHA)/mL	V(H₂O)/mL	m(MoS₂)/m(Gr)
1#	30	120	2	30	2.46∶1
2#	40	80	2	40	1.23∶1
3#	40	40	2	40	0.62∶1
4#	80	40	2	80	0.31∶1
5#	80	20	2	80	0.15∶1

Fig.1 SEM images of graphene(A), MoS2(B), 3#MoS2/Gr(C, D) and TEM images of 3#MoS2/Gr(E, F)

Fig.2 XPS spectra of MoS2/Gr(A) Survey spectrum; (B)—(D) high resolution XPS spectra of C1s, Mo3d and S2p, respectively.

Fig.3 LSV curves of the electrodes loaded with 1 mg/cm2 composites(1#—5#), Pt/C and CP cathode(A) and the electrodes with different loading amounts of 3# composite(B)

Fig.4 Tafel plots for 3#MoS2/Gr(1.5 mg/cm2), Pt/C and CP

Fig.5 Nyquist plots of 3#MoS2/Gr(1.5 mg/cm2) and Pt/CEIS tests were conducted under the condition of open circuit voltage with a potential amplitude of 10 mV over a frequency range of 100 kHz—10 mHz. Inset: Medium-high frequency part.

Fig.6 Current generation for the three cathode electrodes in the MECs(A) and the MEC gas composition per cycle(B) The applied voltage was 0.7 V.

Table 2 Energy efficiencies and hydrogen production in the MEC with different cathodes

Cathode	R_CE(%)	$R H 2$ (%)	R_cat(%)	$Q H 2$ /(m³ H₂·m^-3·d^-1)	η_W(%)	η_W+S(%)
CP	19.18±2.97	3.48±0.61	17.41±2.26	0.021±0.004	45.60±4.90	3.97±0.55
Pt/C	83.19±11.77	62.75±8.67	71.40±9.03	0.377±0.052	228.39±18.91	83.46±10.16
MoS₂/Gr	89.11±5.87	70.47±6.78	78.86±2.49	0.424±0.041	227.59±15.55	81.92±5.86

Table 2 Energy efficiencies and hydrogen production in the MEC with different cathodes

Cathode	R_CE(%)	$R H 2$ (%)	R_cat(%)	$Q H 2$ /(m³ H₂·m^-3·d^-1)	η_W(%)	η_W+S(%)
CP	19.18±2.97	3.48±0.61	17.41±2.26	0.021±0.004	45.60±4.90	3.97±0.55
Pt/C	83.19±11.77	62.75±8.67	71.40±9.03	0.377±0.052	228.39±18.91	83.46±10.16
MoS₂/Gr	89.11±5.87	70.47±6.78	78.86±2.49	0.424±0.041	227.59±15.55	81.92±5.86

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Preparation and Electrochemical Evaluation of MoS₂/graphene as a Catalyst for Hydrogen Evolution in Microbial Electrolysis Cell^†

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