Anodic electrocatalyst for direct borohydride fuel cell and preparation method thereof
A borohydride, fuel cell technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, battery electrodes, etc., can solve the problem of increasing catalyst costs, low electrocatalytic activity, and complex preparation processes and other problems, to achieve the effect of good industrial application prospects, high catalytic surface area, and simple preparation process
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example 1
[0028](1) Preparation of gold sol: take 8.12ml of 0.1M chloroauric acid aqueous solution, add 1525.1ml of twice distilled water, magnetically stir, add 16.8ml of aqueous solution of 1wt% polyvinyl alcohol PVA17 / 88, stir for 20min to make it mix evenly, 50 ml of freshly prepared 0.32 wt % sodium borohydride aqueous solution was added dropwise at room temperature under magnetic stirring, and stirring was continued for 30 min after the addition was completed to form a stable wine-red gold sol. The average diameter of gold particles observed by TEM is 3.0 nm.
[0029] (2) Purification and surface oxidation treatment of carbon nanotubes: the average diameter of carbon nanotubes is 10 nm, and the carbon nanotubes are first treated with 37% concentrated hydrochloric acid solution, heated and refluxed in an oil bath at 120° C. for 6 hours. Filter wash without Cl - Then add 65% concentrated nitric acid and 98% concentrated sulfuric acid solution at a volume ratio of 2:1, heat and refl...
example 2
[0033] (1) Preparation of gold sol: Weigh 8.12ml of 0.1M chloroauric acid aqueous solution, add 725.1ml of double distilled water, stir magnetically, add 16.8ml of 1wt%% polyvinyl alcohol PVA17 / 88 aqueous solution, stir for 20min to make it mix evenly , add dropwise 50ml of freshly prepared 0.32wt% sodium borohydride aqueous solution at room temperature under magnetic stirring, and continue stirring for 30min after the dropwise addition to form a stable wine-red gold sol. The average diameter of gold particles observed by TEM is 5.4nm.
[0034] (2) Purification and surface oxidation treatment of carbon nanotubes: the carbon nanotubes were first treated with 37% concentrated hydrochloric acid solution, heated and refluxed in an oil bath at 120° C. for 6 hours. Filter wash without Cl - Then add 68% concentrated nitric acid and heat to reflux in an oil bath at 120°C for 6 hours, filter and wash until the filtrate is neutral, dry it under vacuum at 110°C for later use.
[0035] ...
example 3
[0038] The preparation of gold sol is identical with the step (1) of embodiment 1, and the processing of conductive carbon black Vxc-72R is identical with the purification and surface oxidation treatment of embodiment 2 step (2) carbon nanotubes, and the preparation of anode electrocatalyst is the same as embodiment In step (3) in 1, the loading amount of gold is 5%.
[0039] Using the obtained electrocatalyst as the anode electrocatalyst, the single cell performance of the direct sodium borohydride-air fuel cell at room temperature and normal pressure shows an open circuit voltage of 0.98V and a maximum power density of 14.5mW / cm 2 .
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