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Preparation method of graphite surface in-situ graphenized and Pt-supported electrocatalysis hydrogen evolution catalyst

A graphene and electrocatalytic technology, applied in the field of electrocatalytic hydrogen evolution, can solve the problems of mild conditions, process energy consumption, high synthesis temperature, etc., and achieve the effect of mild conditions, low cost and stable catalyst

Active Publication Date: 2016-10-26
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation method of this catalyst requires high synthesis temperature, and the process is relatively energy-consuming and the conditions are not mild.

Method used

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  • Preparation method of graphite surface in-situ graphenized and Pt-supported electrocatalysis hydrogen evolution catalyst
  • Preparation method of graphite surface in-situ graphenized and Pt-supported electrocatalysis hydrogen evolution catalyst
  • Preparation method of graphite surface in-situ graphenized and Pt-supported electrocatalysis hydrogen evolution catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0037] A method for preparing a Pt electrocatalytic hydrogen evolution catalyst supported by in-situ graphene on a graphite surface, comprising the following steps:

[0038] (1) Cut the graphite plate into graphite blocks with a size of 1.0*1.0*0.5cm, punch holes in the graphite block, and use a titanium wire with a diameter of 0.8mm to connect the electrodes as wires. Place the graphite block in 1.0 mol / L HCl, deionized water, 1.0 mol / L NaOH and deionized water for 1 hour to ultrasonically clean the surface of the graphite block, dry it naturally, and mark it as GP.

[0039] (2) With the pretreated graphite block as the positive electrode and the platinum sheet as the negative electrode, connect the potentiostat, set the voltage to 10V, and electrolyze in 0.3mol / L ammonium persulfate solution for 300s. After electrolysis, rinse the surface of the electrode with deionized water, dry it naturally, and mark it as GL / GP-300.

[0040] (3) With the graphite block after electrolyti...

Embodiment 2

[0042] As described in Example 1, the difference is: the electrolysis time in step (2) in Example 1 is changed to 30s, and the rest are the same as Example 1. The electrode material obtained in step (2) is denoted as GL / GP-30, and the finally obtained electrode material is denoted as Pt-GL / GP-30A. The hydrogen evolution overpotential of GL / GP-30 is -492mV, and that of Pt-GL / GP-30A is -218mV.

Embodiment 3

[0044] As described in Example 1, the difference is: the electrolysis time in step (2) in Example 1 is changed to 60s, and the rest are the same as Example 1. The finally obtained electrode material is denoted as Pt-GL / GP-60A. The hydrogen evolution overpotential of Pt-GL / GP-60A is -208mV.

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Abstract

The invention relates to a preparation method of a graphite surface in-situ graphenized and Pt-supported electrocatalysis hydrogen evolution catalyst. The preparation method includes the following steps that (1) a graphite block is connected with a wire and cleaned to serve as an electrode; (2) the graphite block serving as a positive electrode and a Pt sheet electrode serving as a negative electrode are connected to a constant potential rectifier, electrolysis is carried out for 30-600 s in an ammonium persulfate solution, after electrolysis is completed, the surfaces of the electrodes are washed with deionized water, and the electrodes are naturally aired; and (3) the electrolyzed graphite block is used as a working electrode, the electrolyzed Pt sheet electrode is used as a counter electrode, an Ag / AgCl electrode is used as a reference electrode, an H2SO4 solution is used as electrolyte, cyclic voltammetry scanning is conducted on the working electrode under a potential window of -0.8 V-0.0 V at the scanning speed of 100 mV / s, and then the catalyst can be obtained. The steps are simple, no high-temperature environment is involved in the process, conditions are mild, and the prepared catalyst has the overpotential of -144 mV and has good stability.

Description

technical field [0001] The invention relates to a method for preparing a Pt electrocatalytic hydrogen evolution catalyst supported by in-situ graphene on the surface of graphite, and belongs to the technical field of electrocatalytic hydrogen evolution. Background technique [0002] The electrocatalytic hydrogen evolution reaction offers a promising direction for solving future energy problems. At present, a variety of catalysts for electrocatalytic hydrogen evolution reaction have been developed to reduce the overpotential of the reaction and accelerate the reaction rate. Among them, Pt / C exhibited higher catalytic activity for hydrogen evolution reaction. However, high cost limits its large-scale application. Recently, transition metal-based catalysts have been considered as an alternative to noble metal catalysts due to their lower cost. However, transition metal catalysts are prone to corrosion and oxidation, and their low stability limits their applications. Therefo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/02C25B11/08C25B11/12B01J23/42
CPCB01J23/42B01J37/348C25B1/02C25B11/051C25B11/057C25B11/081
Inventor 高明明王晓丹张岩李一凡
Owner SHANDONG UNIV
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