Method for preparing MnO2 through anode electrolysis in strong acid medium to assist in efficient hydrogen production
An anode electrolysis and medium technology, applied in electrolysis components, electrolysis process, electrodes, etc., can solve problems such as bad results, and achieve the effects of avoiding economic waste, high catalytic performance, and high recycling value
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Embodiment 1
[0058] Weigh 31.04g MnSO 4 ·H 2 O (purity ≥ 99%) dissolved in 1L of 50g / L H 2 SO 4 In the solution, after constant volume, it is prepared to contain 10g / LMn 2+ Acidic aqueous composite electrolyte. On the CHI760E electrochemical workstation, the linear voltammetry curve test (LSV) of the composite electrolyte was carried out using a dual-electrode system. The double graphite rods (φ=5mm) were used as the working electrode and the counter electrode respectively. The electrode spacing was 3cm and the scanning speed was 10mV. ·s -1 , The test temperature is 25°C. As a comparison, the above LSV test was also carried out in the pure 50g / L H 2 SO 4 in solution. In addition, the introduction of Hg / Hg 2 SO 4 The electrode is used as a reference electrode to conduct LSV tests in a three-electrode system to explore the Mn 2+ Oxidation behavior at the anode end, the test results are as follows figure 2 shown.
[0059] figure 2 (a) is the Mn in the two-electrode system 2+...
Embodiment 2
[0062] Adopt the 50g / L H prepared by embodiment 1 2 SO 4 +10g / LMn 2+ The solution is used as a composite electrolyte, two graphite sheets (single area: 26cm 2 ) were used as the cathode and the anode respectively, the pole spacing was 3cm, the electrolysis experiment was carried out under the cell voltage of 2.50V, the system temperature was 25°C, the electrolysis time was 12h, and the current value of the electrolysis process was recorded in real time by a multimeter. The above test was also carried out at 50g / L H 2 SO 4 system, the i-t curve responded by constant voltage deposition is as follows image 3 , and the relevant data are summarized in Table 1.
[0063] image 3 The shown i-t curves show that at a cell voltage of 2.50 V, pure 50 g / L H 2 SO 4 The response current density of the electrolysis process in solution is only about 1.5 mA cm -2 , and by introducing 10g / LMn 2+ After ion, Mn 2+ Oxidation at the anode produces MnO 2 The reaction replaces the tradit...
Embodiment 3
[0065] Adopt the 50g / L H prepared by embodiment 1 2 SO 4 +10g / LMn 2+ The solution is used as a composite electrolyte, two graphite sheets (single area: 26cm 2 ) were used as cathode and anode respectively, the distance between electrodes was 3cm, the electrolysis experiment was carried out under the cell voltage of 2.50V, the electrolysis time was 12h, and the electrolysis was carried out at the electrolysis temperature of 40°C, 60°C and 80°C respectively, to explore the effect of temperature on electrolysis process and product phase, and record the current value of the electrolysis process in real time through a multimeter, and the i-t curves deposited at different temperatures are as follows Figure 4 (a), and the relevant data are summarized in Table 1.
[0066] Figure 4 The i-t curve shown in (a) shows that at a cell voltage of 2.50 V, the response current densities at electrolysis temperatures of 40 °C, 60 °C and 80 °C are about 3.3 mA cm, respectively. -2 , 4.6mA·c...
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