Low-load Pt/C catalyst hydrogen diffusion anode and preparation method and application thereof

Abstract

The invention relates to a low-load Pt / C catalyst hydrogen diffusion anode and a preparation method and application thereof. The preparation method comprises the steps that nano carbon is used as a carrier, alkali is used for etching the carbon carrier, then sodium gluconate is used as a complexing agent, chloroplatinic acid is used as a platinum source, and a dipping-thermal reduction method is used for preparing a catalyst. The catalyst carrier has high micropore capacity and is beneficial to dispersion of platinum catalyst particles, so that the catalyst still has high catalytic activity under low platinum loading capacity, and the cost of the platinum catalyst can be obviously reduced. When the catalyst is used for preparing a hydrogen diffusion anode and the electrode is used for zinc electrodeposition, the hydrogen diffusion anode has the characteristics of low cell voltage and low unit consumption of electric energy, and compared with an existing metal anode zinc electrodeposition method, the unit consumption of the electric energy of zinc can be reduced by 60.1%. Compared with an existing gas diffusion electrode zinc electrodeposition technology, under the condition that the platinum loading capacity of the catalyst is reduced, the cell voltage is reduced by 0.31 V, and the unit consumption of the electric energy is also reduced by 70.64 kW * h / t.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and specifically relates to a low-loaded Pt / C catalyst hydrogen diffusion anode and its preparation method and application, more specifically its application in zinc electrodeposition. Background technique [0002] Pyrometallurgy and hydrometallurgy are the main production methods of zinc at present. Among them, pyrometallurgy has been gradually replaced by hydrometallurgy due to its shortcomings such as high energy consumption, heavy pollution, high labor intensity, and complicated operation. Hydrometallurgy has become the main method of zinc smelting due to its characteristics of easy continuous production, environmental friendliness, good working conditions and good product quality. Generally speaking, hydrometallurgy is divided into several steps such as beneficiation, leaching, purification, electrowinning, and ingot casting. Among them, the electrowinning process is the main step...

AI Technical Summary

Problems solved by technology

At present, lead-silver alloy is mostly used as anode in industrial hydrometallurgy, which has the following disadvantages: 1) Oxygen evolution reaction occurs at the anode, high electrode potential and overpotential increase production energy consumption, and will cause the temperature of the anode to rise and generate acid mist , additional cooling measures are required; 2) Anode dissolution, in addition to the dissolution of lead itself, the hypoeutectic alloy formed by lead-silver alloy is easy to fall off further under industrial production conditions, polluting the electrolyte and cathode products; 3) lead-silver anode machinery Low strength, prone to bending deformation, causing short circuit and other dangers; 4) Poor conductivity of the anode, resulting in uneven distribution of current density, causing local overheating of the anode; 5) Anode slime is produced, and the lead oxide, Deposits such as manganese oxide, which bring additional costs

Catalysts with low platinum loading are affected by catalytic performance, preparation process, and service life, and their catalytic effect is poor, so there are few reports and no commercial applications.

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