Nanosheet Pt/carbonized sawdust material and preparation method thereof

A nano-sheet and sawdust technology, applied in the field of electrochemistry, can solve the problems of complex process, high production cost, low catalyst activity, etc., and achieve the effects of simple process, convenient operation and high catalytic activity

Inactive Publication Date: 2018-02-23

JIANGSU UNIVERSITY OF TECHNOLOGY

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AI-Extracted Technical Summary

Problems solved by technology

[0005] Aiming at the technical problems of low catalyst activity, high production cost and complicated process in the prior art, the present invention provides a nano-flaky Pt/carbonized wood chip material and a preparatio...

Abstract

The invention discloses a nanosheet Pt/carbonized sawdust material and a preparation method thereof. The preparation method comprises: carbonizing sawdust; loading Pt to the carbonized sawdust by means of electrodeposition. Pt Nanoparticles herein have nanosheet structure, so that large specific surface area is provided and electrocatalytic oxidation activity of a catalyst for formic acid can be greatly improved; the nanoparticles have good stability; the preparation method is simple; the reaction time is short; the controllability is great. Compared with the prior art, the nanosheet Pt/carbonized sawdust material and the preparation method thereof have the advantages that a catalyst carrier herein is carbonized sawdust, the sources of the sawdust are widely ranged, the sawdust is economical and environmentally friendly and is a recyclable green source, and therefore, it is economically feasible to use the carbonized sawdust as a base to load Pt.

Application Domain

Cell electrodes

Technology Topic

ChemistryNanometre +10

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Examples

Experimental program(3)

Example Embodiment

[0025] (Example 1)

[0026] Cut some of the dried sawdust, sonicate it with deionized water for 5 minutes, wash it with deionized water again, and then dry it. Under the protection of nitrogen, the wood chips are placed in a steel jade boat, and continue to move 0.05m into the atmosphere tube furnace. 3 The flow rate of nitrogen per hour was passed for 30 minutes to replace the air, and then the temperature was raised at a rate of 0.5°C/min to 850°C and kept for 2 hours, then cooled to room temperature and taken out.

[0027] The saturated calomel electrode is used as the reference electrode, the platinum wire electrode is used as the counter electrode, and the carbonized wood chips are used as the working electrode, with 0.5mol/L H 2 SO 4 And 0.005mol/L H 2 PtCl 6 As the electrolyte, the cyclic voltammetry was used to load Pt to obtain Pt/carbonized wood chips. Cyclic voltammetry electrodeposition parameters: scanning low voltage range -0.4V, scanning high voltage range 1.4V, scanning cycle is 500 times.

[0028] Such as figure 1 The SEM spectrum of the Pt/carbonized wood chips obtained in the above shows that the nano-flaky Pt is uniformly loaded on the surface of the carbonized wood chips.

[0029] Such as figure 2 The XRD diffraction pattern of medium Pt/carbonized wood chips shows that the main diffraction peaks of Pt/carbonized wood chips prepared in this example are C and Pt. Among them, the peaks at 2θ of 25.9°±0.2 belong to the (002) plane of C; the peaks at 2θ of 39.703°±0.2, 46.139°±0.2, 67.474°±0.2 and 81.255°±0.2 positions, corresponding to (111), (200), (220) and (311) crystal planes of Pt.

[0030] Such as image 3 In the cyclic voltammetry spectrum of a mixed solution of sulfuric acid and formic acid using Pt/carbonized wood chips as the working electrode, the redox peak potentials of the Pt/carbonized wood chips electrode prepared in this example are 1140mV and 600mV, respectively, and the peak potential difference is 540mV. The cyclic voltammetry spectrum has obvious redox peaks, the electron transfer resistance is small, the rate is fast, and its electrochemical activity is significantly enhanced.

Example Embodiment

[0031] (Example 2)

[0032] Refer to the method in Example 1 to treat the wood chips. Under the protection of nitrogen, the wood chips are placed in a steel jade boat, and they are continuously placed in the atmosphere tube furnace for 5 m 3 The flow rate of nitrogen gas per hour is 45min to replace the air, the temperature is increased at a rate of 1.5°C/min to 850°C and the temperature is kept for 3 hours, and it is cooled to room temperature and taken out. The saturated calomel electrode is used as the reference electrode, the platinum wire electrode is used as the counter electrode, and the carbonized wood chips are used as the working electrode, with 0.5mol/L HCOOH and 0.005mol/L H 2 PtCl 6 As the electrolyte, the cyclic voltammetry is used to load Pt. The cyclic voltammetry electrodeposition parameters: scan low voltage range -0.4V, scan high voltage range 1.4V, scan cycle is 200 times.

Example Embodiment

[0033] (Example 3)

[0034] After treating the wood chips with the method in Reference Example 1, under the protection of nitrogen, the wood chips were placed in a steel jade boat, and kept in the atmosphere tube furnace for 10m 3 The flow rate of nitrogen per hour was passed for 60 minutes to replace the air, and the temperature was raised at a rate of 3°C/min to 850°C and kept for 4 hours, then cooled to room temperature and taken out. The saturated calomel electrode is used as the reference electrode, the platinum wire electrode is used as the counter electrode, and the carbonized wood chips are used as the working electrode, with 0.5mol/L CH 3 COOH and 0.005mol/L H 2 PtCl 6 As the electrolyte, the cyclic voltammetry is used to load Pt. The cyclic voltammetric electrodeposition parameters: scan low voltage range -0.4V, scan high voltage range 1.4V, scan cycle is 20 times.

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Classification and recommendation of technical efficacy words

Good dispersion
Large specific surface area

Nanosheet Pt/carbonized sawdust material and preparation method thereof

A nano-sheet and sawdust technology, applied in the field of electrochemistry, can solve the problems of complex process, high production cost, low catalyst activity, etc., and achieve the effects of simple process, convenient operation and high catalytic activity

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

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Example Embodiment

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Description & Claims & Application Information

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