Dual-functional electrocatalyst Pt-IrO2 and preparation method

A pt-iro2, catalyst technology, applied in the field of electrocatalysis, can solve problems such as unsolved defects, and achieve the effects of easy removal, high catalytic performance, and high active area

Active Publication Date: 2019-11-05
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Another example is that the Chinese patent application (application number: CN2015102944178) discloses a dendritic nanowire catalyst carrier with a core-sheath structure of metal oxide/carbon and the preparation method of the loaded cataly

Method used

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  • Dual-functional electrocatalyst Pt-IrO2 and preparation method
  • Dual-functional electrocatalyst Pt-IrO2 and preparation method
  • Dual-functional electrocatalyst Pt-IrO2 and preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1: Take a certain amount of polyvinylpyrrolidone and add absolute ethanol, and stir magnetically to prepare an 8wt% PVP solution.

[0032] Step 2, respectively take 1 g of chloroiridic acid and chloroplatinic acid and add deionized water and stir to obtain a chloroplatinic acid solution and a chloroiridic acid solution with a Pt and Ir content of 0.34 mol / L.

[0033] Step 3: After mixing the solutions in step 2 according to the ratio of Pt / Ir=1:9, add a certain amount of PVP solution in step 1, and magnetically stir for 12 hours to obtain the spinning precursor solution.

[0034] Step 4, adding the precursor solution into the electrospinning equipment, the spinning voltage is 12KV, the spinning distance is 10cm, and the solution propulsion rate is 0.15ml / h.

[0035] Step 5: Collect the spun nanofibers (flat ribbon structure, width 200nm-600nm) and calcinate them in an air atmosphere at a heating rate of 0.75°C / min, first raise the temperature to 260°C and keep it f...

Embodiment 2

[0037] Step 1: Take a certain amount of polyvinylpyrrolidone and add absolute ethanol, and stir magnetically to prepare an 8wt% PVP solution.

[0038] Step 2, respectively take 1 g of chloroiridic acid and chloroplatinic acid and add deionized water and stir to obtain a chloroplatinic acid solution and a chloroiridic acid solution with a Pt and Ir content of 0.17 mol / L.

[0039] Step 3: After mixing the solutions in step 2 according to the ratio of Pt / Ir=1:9, add a certain amount of PVP solution in step 1, and magnetically stir for 12 hours to obtain the spinning precursor solution.

[0040] Step 4, adding the precursor solution into the electrospinning equipment, the spinning voltage is 12KV, the spinning distance is 10cm, and the solution propulsion rate is 0.15ml / h.

[0041] Step 5: Collect the spun nanofibers (nanowire structure, diameter 220nm-350nm) and calcinate them in an air atmosphere at a heating rate of 0.75°C / min, first raise the temperature to 260°C for 1 hour, t...

Embodiment 3

[0043] Step 1: Take a certain amount of polyvinylpyrrolidone and add absolute ethanol, and stir magnetically to prepare an 8wt% PVP solution.

[0044] In step 2, 1 g of chloroiridic acid and chloroplatinic acid were added into deionized water and stirred to obtain a chloroplatinic acid solution and a chloroiridic acid solution with a Pt and Ir content of 0.085 mol / L.

[0045] Step 3: After mixing the solutions in step 2 according to the ratio of Pt / Ir=3:7, add a certain amount of PVP solution in step 1, and magnetically stir for 12 hours to obtain the spinning precursor solution.

[0046] Step 4, adding the precursor solution into the electrospinning equipment, the spinning voltage is 12KV, the spinning distance is 10cm, and the solution propulsion rate is 0.15ml / h.

[0047] Step 5, collect the spun nanofibers (nanowire structure, diameter 220nm-250nm, good uniformity), and calcinate in the air atmosphere, the heating rate is 0.75°C / min, the temperature is first raised to 260°...

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Abstract

The invention discloses a dual-functional electrocatalyst Pt-IrO2 and a preparation method. Chloroplatinic acid and chloroiridic acid are used as a precursor solution, a Pt-IrO2 nanowire catalyst is obtained by an electrostatic spinning method, the catalyst carrying capacity is reduced, and meanwhile, the active area is effectively expanded. The preparation process is simple to operate, the Pt andIrO2 proportion in the catalyst is good in adjustability, other additives are not needed to be added, no leakage and no corrosion exist, and the preparation process is simple to operate, is good in repeatability, is suitable for industrial production on a large scale and has a wide prospect in the field of electrolysis water. The preparation method comprises the following steps of (1) preparing aPVP solution; (2) adding the chloroplatinic acid and the chloroiridic acid into deionized water to form a solution; (3) adding the PVP solution after the chloroplatinic acid and chloroiridic acid solution is mixed according to a certain proportion, and performing magnetic stirring to form a spinning precursor; (4) performing electrostatic spinning under a certain condition; and (5) sintering to obtain the Pt-IrO2 nanowire catalyst.

Description

technical field [0001] The invention belongs to the technical field of electrocatalysis, in particular to a Pt-IrO catalyst with dual functions of oxygen reduction (ORR) and oxygen evolution (OER). 2 and its preparation method. Background technique [0002] With the development of society, energy depletion and increasingly serious environmental pollution, the proportion of renewable energy in energy applications is increasing, but the volatility of renewable energy and other issues hinder people's utilization of it. Hydrogen production by electrolysis of water can effectively solve these problems. Hydrogen is not only a kind of clean energy, but also can be used as an energy storage material and added to the renewable energy power generation cycle. Therefore, hydrogen production by electrolysis of water has broad application prospects. [0003] An integrated renewable fuel cell (URFC) is a battery with two working modes, which can work as both a fuel cell and an electrolyt...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/92H01M8/18B82Y30/00
CPCB82Y30/00H01M4/90H01M4/9016H01M4/92H01M8/18Y02E60/50Y02P70/50
Inventor 叶锋王志明刘鹏禹航宇徐超杜小泽
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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