Carbon-based potentiometric hydrogen sensor using a proton conducting graphene oxide membrane coupled with a WO3 sensing electrode
Carbon-based potentiometric hydrogen sensor using a proton conducting graphene oxide membrane coupled with a WO3 sensing electrode
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DOI：
10.1016/j.snb.2020.128678
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发表时间：
2020-11-15
影响因子：
8.4
通讯作者：
Kida, Tetsuya
中科院分区：
文献类型：
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作者：
Fauzi, Aynul Sakinah Ahmad;Hamidah, Nur Laila;Kida, Tetsuya
为了安全使用氢气，在生产、使用和运输氢气时，现场监测其在大气中的浓度是必不可少的。在这里，我们报告了一种用于氢传感的碳基电化学装置，该装置使用质子传导氧化石墨烯（GO）膜作为传感电极，该膜配有三氧化钨（WO 3）和还原氧化石墨烯（rGO）的复合物。使用浓差电池测量和质子泵技术，我们证明了质子可以在通过堆叠GO纳米片制成的膜中扩散，所述GO纳米片通过Hummers方法通过石墨的氧化和剥离合成。装有WO 3-rGO的GO膜在室温下对空气中100 ppm的H-2表现出超过50 mV的良好传感器响应，响应斜率为82 mV/decade。GO装置的H-2检测极限为约11 ppm。的传感机制解释的混合电位理论，其中阳极和阴极反应的氢和氧，分别进行同时在GO和WO 3-rGO之间的界面。该装置还显示出良好的稳定性和对H-2的选择性超过其他可燃气体，如CO，乙醇和丙酮。
For the safety use of hydrogen, on-site monitoring of its concentrations in the atmosphere is indispensable when producing, using, and transporting hydrogen. Here, we report that a carbon-based electrochemical device for hydrogen sensing has been realized using a proton conducting graphene oxide (GO) membrane fitted with a composite of tungsten trioxide (WO3) and reduced graphene oxide (rGO) as the sensing electrode. Using concentration cell measurements and proton pumping techniques, we proved that protons can diffuse in a membrane made by stacking GO nanosheets that were synthesized by oxidation and exfoliation of graphite via the Hummers' method. The GO membrane fitted with WO3-rGO exhibited a good sensor response of more than 50 mV to 100 ppm H-2 in air with a response slope of 82 mV/decade at room temperature. The H-2 detection limit of the GO device was approximately 11 ppm. The sensing mechanism is explained in terms of the mixed potential theory, in which anodic and cathodic reactions of hydrogen and oxygen, respectively, proceed simultaneously at the interface between GO and WO3-rGO. The device also showed a good stability and selectivity to H-2 over other combustible gases such as CO, ethanol, and acetone.