A Facile and Reliable Method of Adhering Graphite Felt Electrode to Current Collector and Its Application in Electrolysis

化学工业与工程

Chemcial Industry and Engineering

2018, Vol. 35

Issue (6) :41-47 DOI: 10.13353/j.issn.1004.9533.20171035

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A Facile and Reliable Method of Adhering Graphite Felt Electrode to Current Collector and Its Application in Electrolysis

Liu Mengzhen^1,2,3,4, Chang Yan^1,2,3,4, Zhang Wen^1,2,3,4, Wang Yuxin^1,2,3,4

1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China;
2. State Key Laboratory of Chemical Engineering, Tianjin 300350, China;
3. China Co-Innovation Center of Chemical Science & Engineering, Tianjin 300072, China;
4. Tianjin Key Laboratory of Membrane Science & Desalination Technology, Tianjin 300350, China

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Abstract Graphite felt is a good material for making three dimensional electrodes because of its large specific surface area, high conductivity, low cost and easy availability. To make sure good contact between the electrode and the current collector, a facile and reliable adhesion between a graphite felt electrode and a current collector of flexible graphite paper was realized by using an in-house made conductive adhesive made up of highly conductive carbon black as the filler and polyvinylidene fluoride as the binder. The influences of the adhesive composition, the amount of the adhesive used and the curing pressure on the contact resistance and adhesion strength between the graphite felt and the flexible graphite paper were investigated. In contrast to the case without using adhesive, the interface adhered under suitable conditions shows a marked drop of contact resistance by 50% in a wet environment. Meanwhile the tensile shear strength of the adhered samples reaches 25.3×10^-3 MPa, which is at the same magnitude as the strength of the felt. When applied to the electrolytic regeneration of acidic copper chloride etchant in printed circuit board production, the adhering method results in a drop of single cell voltage by 0.08 V. This would translate into a reduction of power consumption by 80 kW·h for 1 ton of metal copper recovered.

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	Liu Mengzhen
	Chang Yan
	Zhang Wen
	Wang Yuxin

Keywords： 3D composite electrode； conductive adhesive； contact resistance； cell voltage

Received 2017-10-13;

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Liu Mengzhen, Chang Yan, Zhang Wen, Wang Yuxin.A Facile and Reliable Method of Adhering Graphite Felt Electrode to Current Collector and Its Application in Electrolysis[J] Chemcial Industry and Engineering, 2018,V35(6): 41-47

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