Amorphous titanium dioxide/nano iridium oxide/porous silicon anode and preparation method thereof

A titanium dioxide and nanoporous technology, applied in the direction of electrodes, gaseous chemical plating, coatings, etc., can solve the problems of reducing the catalytic performance of catalysts, high catalyst consumption, and extremely high energy input requirements, so as to maintain high-efficiency characteristics and high catalytic performance , the effect of high electrochemical stability

Active Publication Date: 2019-03-22
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, during the preparation of DSA, the formation of a stable lattice structure not only reduces the catalytic performance of the catalyst itself, but also requires extremely high energy input, while the amount of catalyst is still high

Method used

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  • Amorphous titanium dioxide/nano iridium oxide/porous silicon anode and preparation method thereof
  • Amorphous titanium dioxide/nano iridium oxide/porous silicon anode and preparation method thereof
  • Amorphous titanium dioxide/nano iridium oxide/porous silicon anode and preparation method thereof

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preparation example Construction

[0041] The preparation method of the nanoporous silicon substrate of the surface-loaded nano iridium oxide catalyst comprises the following steps:

[0042] A1. Preparation of nanoporous silicon substrate: Clean the silicon substrate material, form a nanoporous structure on the silicon substrate material by silver ion assisted chemical etching, and then treat it with concentrated nitric acid for 3-5 minutes, wash it, and dry it;

[0043] A2, the synthesis of iridium oxide catalyst precursor solution: K 2 IrCl 6 Dissolve in water with NaOH, stir and heat at 70°C for 40 minutes, then refrigerate at 4°C after cooling;

[0044] A3. Loading of iridium oxide catalyst: drip-coat the iridium oxide catalyst precursor solution prepared in step A2 on the surface of the nanoporous silicon substrate prepared in step A1, and evaporate the solvent to dryness at 80-150° C., and then anneal at low temperature, that is The nanoporous silicon substrate with nano iridium oxide catalyst supported...

Embodiment 1

[0054] This embodiment provides a nano iridium oxide / porous silicon anode protected by amorphous titanium dioxide and a preparation method thereof, the anode includes a nanoporous silicon substrate with better hydrophilicity, an iridium oxide nano catalytic unit synthesized with an aqueous precursor, and Amorphous titanium dioxide layer for substrate and catalyst protection. Among them, the silver ion-assisted chemical etching method is used in the formation method of the nanoporous silicon structure, which can not only remove the silver ion but also achieve a certain degree of hydrophilicity on the surface during the nitric acid treatment process, thereby realizing the uniform distribution of the surface catalyst; A small amount of catalyst exists in an amorphous state, with at least three different valence states, and has high electrochemical catalytic oxygen production performance; the titanium dioxide protective layer exists in an amorphous state, and has certain leakage an...

Embodiment 2

[0072] In this example, the effects of different etching times on the performance of catalysts were compared. at 0.2g / cm 2 Under the condition of macroscopic catalytic amount, such as Image 6 As shown, under the condition of 6 minutes, the etching depth of 500nm, that is, the actual pore depth, is enough to disperse the catalyst, the catalytic performance changes little, and the high-efficiency catalytic performance of the catalyst can be maintained. Under the condition of 3 minutes, under the voltage of 1.5V, it is enough to see a large number of small bubbles being released rapidly; at 6 minutes, the release speed of the bubbles is still rapid, and it can be seen from the catalytic performance diagram that the effect is similar to that of 3 minutes; under the condition of 9 minutes, the release of bubbles becomes faster Slow, this is because the effect of the protective layer begins to deteriorate under the condition of 9min, and the performance of the catalyst begins to d...

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Abstract

The invention discloses an amorphous titanium dioxide / nano iridium oxide / porous silicon anode and a preparing method thereof. The anode comprises a nano-porous silicon substrate with the surface loaded with a nano iridium oxide catalyst and a titanium dioxide protection layer; the outer side of the nano-porous silicon substrate with the surface loaded with the nano iridium oxide catalyst is coated with the titanium dioxide protection layer; a synthetic method of the anode is easy to operate, an obtained electrode still has the porous characteristic of the nano-porous silicon substrate and the efficient catalytic performance of the nano iridium oxide catalyst, the thickness condition of a titanium dioxide layer is controllable, and due to the existence of the titanium dioxide layer, the electrode is longer in service life. Due to the characteristics that the adopted titanium dioxide replaces iridium oxide in a traditional anode, and the low-temperature condition preparing is adopted, the electrode preparing cost is greatly reduced.

Description

technical field [0001] The invention relates to the preparation of a silicon material-based anode with high electrocatalytic performance and stability, in particular to an amorphous titanium dioxide / nano iridium oxide / porous silicon anode and a preparation method thereof. Background technique [0002] Water electrolysis is considered to be a clean way to produce hydrogen and oxygen, but its cost has been a key factor limiting its wide application. In the process of electrolyzing water, the preparation of anode materials has the most profound impact on the cost of the system, electrode life, and electronic efficiency. For electrochemical anodes, there are two basic requirements. The first is to have a low oxygen production potential, and the second is to have better working stability to reduce oxidation and dissolution during work. Therefore, stable noble metal materials such as gold, platinum, and iridium are usually used for electrochemical oxidation reactions. Among them...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/06C25B1/04C23C16/40C23C16/455
CPCC23C16/405C23C16/45525C25B1/04C25B11/069C25B11/077Y02E60/36
Inventor 赵一新钱旭芳阚淼贾爱华岳东亭张太阳郭男杰李戈任孟徐凤祝瑶王艺鹏
Owner SHANGHAI JIAOTONG UNIV
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