MoS2/Y分子筛微生物电解池阴极材料制备及其电化学性能

doi:10.16085/j.issn.1000-6613.2020-1081

摘要/Abstract

摘要：

采用水热法合成了一系列不同比例的MoS₂/Y分子筛复合物，并将其制成碳基复合电解池阴极。线性扫描伏安法（LSV）测试表明，当MoS₂和Y分子筛质量比为5∶2、碳纸负载量为1.5mg/cm²时，阴极催化析氢性能最佳。通过SEM、TEM、XRD、XPS和BET对复合材料进行表征，SEM测试表明MoS₂/Y分子筛为片状和八面体相互交织叠加的云状形貌。BET测试表明其具有排列规整的微孔-介孔多级孔道结构，利于加速H⁺还原和H₂扩散。本文还考察了以MoS₂/Y分子筛作为微生物电解池（MEC）阴极的析氢性能。在MEC运行5个周期的产氢实验中，MoS₂/Y分子筛所产生的平均最大电流密度、氢气产率和产氢量等都高于Pt电极，且具有长期稳定性。因此，MoS₂/Y分子筛是一种适于实际应用的析氢催化剂。

关键词: MoS₂/Y分子筛, 析氢性能, 微生物电解池

Abstract:

A series of MoS₂/Y zeolite composites with different ratios were synthesized by hydrothermal method and made into the carbon-based composite electrolytic cell cathode. The LSV test showed that when the mass ratio of MoS₂ and Y zeolite was 5∶2 and the carbon paper loading was 1.5mg/cm², the cathodic hydrogen evolution performance was the best. The composites were characterized by SEM, TEM, XRD, XPS and BET. SEM testing indicated that the MoS₂/Y zeolite was a cloud-like morphology in which sheets and octahedrons were interwoven and superimposed. BET testing showed that it had a well-arranged micropore-mesoporous multi-level channel structure, which was beneficial to accelerate H⁺ reduction and H₂ diffusion. The hydrogen evolution performance of MoS₂/Y zeolite as the cathode of microbial electrolysis cell (MEC) was investigated. In the five-cycle hydrogen production experiment of MEC, the average maximum current density, hydrogen production rate and hydrogen production of MoS₂/Y zeolite were higher than that of Pt electrode, and had long-term stability. Therefore, MoS₂/Y zeolite was a suitable hydrogen evolution catalyst.

Key words: MoS₂/Y zeolite, hydrogen evolution performance, microbial electrolysis cell

中图分类号:

O646

赵煜, 李佳, 杨冬花, 王改, 张杰, 王玉雪. MoS₂/Y分子筛微生物电解池阴极材料制备及其电化学性能[J]. 化工进展, 2021, 40(5): 2695-2702.

ZHAO Yu, LI Jia, YANG Donghua, WANG Gai, ZHANG Jie, WANG Yuxue. Preparation of MoS₂/Y zeolite microbial electrolysis cell cathode material and its electrochemical properties[J]. Chemical Industry and Engineering Progress, 2021, 40(5): 2695-2702.

图/表 9

图1 MoS2/Y分子筛材料的制备过程

表1 合成MoS2/Y分子筛复合材料的原料配比

样品序号

m(Na₂MoO₄)

/mg

m(CH₄N₂S) /mg

m(Y)

/mg

V(H₂O)

/mL

图2 各种材料及不同负载量MoS2/Y分子筛的LSV图

图3 不同材料的电化学性能测试

图4 不同材料的扫描电镜及透射电镜图

图5 材料的XRD图

图6 不同材料的XPS图及N2吸脱附曲线

图7 MEC中5个周期的不同阴极的电流密度图和产气图

表2 不同阴极材料的MEC产氢效率

阴极	$R H 2$ /%	$R H 2$ /m³·m^-3·d^-1
空白碳纸	18.22±2.16	0.061±0.006
MoS₂/Y分子筛	78.70±11.14	0.260±0.037
Pt	59.02±5.58	0.195±0.018

表2 不同阴极材料的MEC产氢效率

阴极	$R H 2$ /%	$R H 2$ /m³·m^-3·d^-1
空白碳纸	18.22±2.16	0.061±0.006
MoS₂/Y分子筛	78.70±11.14	0.260±0.037
Pt	59.02±5.58	0.195±0.018

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MoS₂/Y分子筛微生物电解池阴极材料制备及其电化学性能

Preparation of MoS₂/Y zeolite microbial electrolysis cell cathode material and its electrochemical properties

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