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3-D Cathode for Hydrogen Evolution
The hydrogen generation takes place at a negatively polarised cathode surface contacted with a gas/liquid dispersion with important co-interactive pH and potential gradients. It is important that the surface has best possible electrochemical properties: On one hand, there is a need for suitable geometrical dimensions accomplishing efficient mass transfer of reactants and products. At the same time, the surface has to be made out of an electro-catalytically efficient material with a large contact area towards the surrounding gas/liquid phase.
Recent progress in materials science and nano technology increases the possibilities to tailor make cathode surfaces. The aim of the present study is to understand what is the optimum structure of such a porous cathode regarding shape, size, depth and frequency of pores. It involves mathematical modelling using the software package Femlab as well as electrochemical experimental work.
This work will be made in close contact with Eka Chemicals, world leading producer of chlorate for pulp bleaching applications. As side product about 50 000 tonnes H2/year is generated electrochemically. There is a prioritised interest to develop the cathode technology further to reduce the power consumption and achieve energy savings.
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