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A kind of preparation method of two-dimensional porous pt nanosheet and its obtained material and application

A nanosheet, fuel cell technology, applied in the fields of nanotechnology, nanotechnology, nanotechnology for materials and surface science, can solve the problems of high price and scarce Pt reserves, and achieve more active sites, which is conducive to transmission. With the effect of diffusion and high purity

Active Publication Date: 2020-05-19
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, noble metal Pt is the most commonly used fuel cell cathode catalyst, but Pt reserves are scarce and expensive

Method used

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  • A kind of preparation method of two-dimensional porous pt nanosheet and its obtained material and application
  • A kind of preparation method of two-dimensional porous pt nanosheet and its obtained material and application
  • A kind of preparation method of two-dimensional porous pt nanosheet and its obtained material and application

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Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method of two-dimensional porous Pt nanosheets, comprising the following steps:

[0028] 1) Recrystallization of precursor and alkali metal inorganic salt saturated solution: measure 3mL saturated NaCl solution, add 1mL0.02mol L -1 H 2 PtCl 6 Precursor solution, shake and mix evenly, disperse into a watch glass and recrystallize at room temperature.

[0029] 2) Preparation of two-dimensional porous Pt nanosheets: the recrystallized product obtained in step 1) was heated in a hydrogen atmosphere at 5°C min -1 The temperature was raised to 300° C. for heat treatment, and kept at this temperature for 3 hours. After cooling to room temperature, the final product was obtained by centrifuging and washing with water for several times.

Embodiment 2

[0031] A preparation method of two-dimensional porous Pt nanosheets, comprising the following steps:

[0032] 1) Recrystallization of precursor and alkali metal inorganic salt saturated solution: measure 3mL saturated Na 2 SO 4 solution, add 1mL0.02mol L -1 H 2 PtCl 6 Precursor solution, shake and mix evenly, disperse into a watch glass and recrystallize at room temperature.

[0033] 2) Preparation of two-dimensional porous Pt nanosheets: the recrystallized product obtained in step 1) was heated in a hydrogen atmosphere at 5 °C min -1 The temperature was raised to 300° C. for heat treatment, and kept at this temperature for 3 hours. After cooling to room temperature, the final product was obtained by centrifuging and washing with water for several times.

Embodiment 3

[0035] A preparation method of two-dimensional porous Pt nanosheets, comprising the following steps:

[0036] 1) Recrystallization of precursor and alkali metal inorganic salt saturated solution: measure 3mL saturated MgCl 2 solution, add 1mL0.02mol L -1 H 2 PtCl 6 Precursor solution, shake and mix evenly, disperse into a watch glass and recrystallize at room temperature.

[0037] 2) Preparation of two-dimensional porous Pt nanosheets: the recrystallized product obtained in step 1) was heated in a hydrogen atmosphere at 5°C min -1 The temperature was raised to 300° C. for heat treatment, and kept at this temperature for 3 hours. After cooling to room temperature, the final product was obtained by centrifuging and washing with water for several times.

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Abstract

The invention discloses a preparation method for a two-dimensional porous Pt nanosheet, a material prepared by using the same and application of the material as a cathode catalyst for oxygen reduction. The preparation method comprises the following steps: with an inorganic salt of an alkali metal as a hard template and a platinum salt as a precursor, uniformly mixing a saturated solution of the inorganic salt of the alkali metal with a platinum precursor solution; then carrying out rcrystallization; and carrying out reduction so as to obtain the two-dimensional porous Pt nanosheet. Compared with conventional preparation methods, the preparation method provided by the invention has the following advantages that the preparation method is simple in process, easy to implement and convenient tooperate, and the preparation method is environment-friendly and free of pollution since the NaCl template can be removed through washing with deionized water. The two-dimensional porous Pt nanosheetprepared by using the method of the invention has the advantages of length of more than 1 [mu]m, single morphology, high purity, large specific surface area, multiple active sites, good electron conductivity, and the like, and shows excellent electrocatalytic activity in oxygen reduction.

Description

technical field [0001] The invention relates to a preparation method of a two-dimensional porous Pt nanosheet and the obtained material and application thereof, belonging to the technical field of Pt nanosheets. Background technique [0002] Since the beginning of the 21st century, environmental pollution and energy crisis have become increasingly serious. Under this background, fuel cell technology has attracted widespread attention due to its remarkable advantages of high energy efficiency and low emission. Among them, the proton exchange membrane fuel cell (Proton Electrolyte Membrane Fuel Cell, PEMFC) uses a perfluorosulfonic acid type proton exchange membrane as the electrolyte, Pt / C or PtRu as the main catalyst, hydrogen or other purified reformed gas as the fuel, and air or oxygen as the fuel. oxidizing agent. In addition to the general advantages of fuel cells, it also has the advantages of low operating temperature, quick start at room temperature, convenient maint...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/92B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/928Y02E60/50
Inventor 唐亚文樊闯黄梓涵胡宪宇王超徐林孙冬梅
Owner NANJING NORMAL UNIVERSITY
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