A preparation method of graphite foil electrode and its application in electrochemical sensing
A graphite foil, electrochemical technology, applied in the field of electrochemical materials, can solve the problems of expensive electrode carrier, complicated detection process, high detection limit, etc.
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[0043] Such as Figure 1-7 As shown, the embodiment of the present invention provides a method for preparing a graphite foil electrode, comprising the following steps:
[0044] S1: Prepare a certain concentration of intercalation reagent and use it as electrolyte;
[0045] S2: adding the intercalation reagent obtained in step S1 into the electrolytic cell, using the graphite foil as the working electrode, the platinum sheet and the calomel electrode as the counter electrode and the reference electrode respectively, to form a three-electrode system;
[0046] S3: Using multi-potential step (STEP) technology to partially electrochemically peel off the working electrode to obtain a partially peeled graphite foil electrode;
[0047] S4: Clean the partially peeled graphite foil electrode obtained in step S3, and set it aside.
[0048] Specifically, in step S1, the intercalation reagent is 0.5mol / L NaH2 PO 4 or KH 2 PO 4 solution, the H in the stripping solution 2 PO 4 - As a...
Embodiment 1
[0061] This embodiment is a preparation method for partially peeling graphite foil electrodes, including:
[0062] S1: Prepare intercalation reagent: weigh 19.50g of NaH 2 PO 4 In a 250mL volumetric flask, add distilled water to the mark, and sonicate for 20min. Configured to obtain NaH with a concentration of 0.5mol / L 2 PO 4 The solution is used as an electrolyte.
[0063] S2: First, pretreat the graphite foil: use a commercial graphite foil with a thickness of 0.3mm as the working electrode, cut the graphite foil of the above thickness into 0.5×1.0cm, seal it with insulating tape, and leave a blank of 0.5×0.5cm It is used in the electrode working area.
[0064] Secondly, add 20mL 0.5mol / L NaH to the 50mL electrolytic cell 2 PO 4 The intercalation reagent is used as the electrolyte, the graphite foil is used as the working electrode, and the platinum sheet and the calomel electrode are respectively used as the counter electrode and the reference electrode to form a thr...
Embodiment 3
[0085] The present embodiment is the performance test of the graphite foil before and after stripping, specifically including:
[0086] 1. Electrochemical characterization of partially exfoliated graphite foil electrodes
[0087] Cyclic voltammetry was used to study the effect of electrochemical stripping treatment on the electrochemical active area of the electrode: in the non-faradaic potential range of -0.2~-0.1V vs. SCE, the electrode was scanned by CV at different scan rates, and the scan rate was: 10 , 50, 100, 150 and 200mV / s. Through the above processing, we get Figure 5 ,in, Figure 5 a is the CV curve of the graphite foil (G) before peeling off, Figure 5 b is the CV curve of the partially peeled graphite foil (EG); Figure 5 c is the linear relationship between the current and the scan rate of the graphite foil (G) before the peeling at the working electrode at the potential of -0.12V vs. SCE, Figure 5 d is the linear relationship between the current and th...
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Abstract
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