A reduction catalyst, an electrode containing the catalyst and its preparation method and application
A catalyst and raw material technology, applied in the field of electrochemistry, can solve the problems of restricting the industrial application of electrocatalytic carbon dioxide and low catalytic activity of electrodes, and achieve the effects of high selectivity and activity, high current density, and reduced usage
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Embodiment 1
[0037] Embodiment 1 Preparation of Ag nanoparticles
[0038] Mix 50 μL of 0.05 M silver nitrate solution, 0.5 mL of 75 mM trisodium citrate solution, and 60 μL of 30 wt% H at room temperature 2 o 2 Added to 24.75mL of H 2 O middle. After adding 250μL 100mM NaBH 4 After that, the solution was vigorously stirred to obtain Ag nanoparticles dispersed in the solution. Ag nanoparticles were collected from 7 mL of this solution containing Ag nanoparticles by centrifugation several times. Measure the mass concentration C of Ag nanoparticles contained in the 7 mL solution by inductively coupled plasma optical emission spectrometer (ICP-OES) m (See Table 1). Then, by m=C m ×V Calculate the amount m of Ag nanoparticles in the C / Ag mixture, where V=7 mL.
[0039] Table 1 is dispersed with the mass concentration C of the solution of Ag nanoparticle through ICP-OES m
[0040]
Embodiment 2
[0041] The preparation of the zinc sheet of embodiment 2 anodic oxidation
[0042] Zinc sheet (or known as zinc foil) was used as anode and cathode in a two-electrode system using H containing 0.08M salicylic acid 2 O (10 mL) / ethanol (40 mL) solution was oxidized under a bias voltage of 30 V for 1 hour. Such as figure 1 As shown, as the oxidation reaction proceeds, nano-zinc aggregated grows on the surface of the anode zinc sheet, which is an ordered layered sheet (almost perpendicular to the anode zinc sheet), and the scanning electron microscope image of the nano-zinc structure is as follows figure 1 As shown, the thickness of the anode zinc sheet containing nano-zinc on the surface is about 10nm.
[0043] The XRD pattern of anodic zinc sheet, anodized zinc sheet (that is, anodic zinc sheet containing nano-zinc on the surface) and zinc standard card is shown in the figure Figure 6 shown by Figure 6 It can be seen that the anodized zinc sheet has no peak increase or d...
Embodiment 3
[0044] The preparation of embodiment 3 zinc-carbon-silver electrode
[0045] 1) Silver nanoparticles of 50nm (prepared according to the method of Example 1, such as figure 2 As shown in the b figure) and carbon black at 0.003:1 (mass ratio) mixed in a solution consisting of isopropanol, water and 5% Nafion (the volume ratio of isopropanol, water and Nafion is 7:2:1 ), a uniform ink-like mixed solution A (ie C / Ag mixture) was obtained after ultrasonication for 3 h.
[0046] 2) Get 10 μ L of mixed solution A and drop it on a 10nm-thick surface containing special nano-zinc zinc sheet B (i.e. the anodized zinc sheet prepared in Example 2, such as figure 2 As shown in a figure in the above), after drying overnight, a zinc-carbon-silver electrode is obtained, and its scanning electron microscope picture is as follows figure 2 c plot in and Figure 7 In (a) shown. Its physical picture is as Figure 5 as shown in.
[0047] 3) In the three-electrode system, under -1V vs RHE,...
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