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microbial electrolysis cell
A microbial electrolysis cell (MEC) is a technology related to Microbial fuel cells (MFC). Whilst MFC's produce an electric current from the microbial decomposition of organic compounds, MEC's partially reverse the process to generate hydrogen or methane from organic material by applying an electric current. The electric current would ideally be produced by a renewable source of power. The hydrogen or methane produced can be used to produce electricity by means of an additional PEM fuel cell or internal combustion engine.
==Microbial electrolysis cells==
MEC systems are based on a number of components:
Microorganisms - are attached to the anode. The identity of the microorganisms determines the products and efficiency of the MEC.
Materials - The anode material in a MEC can be the same as an MFC, such as carbon cloth, carbon paper, graphite felt, graphite granules or graphite brushes. Platinum can be used as a catalyst to reduce the overpotential required for hydrogen production. The high cost of platinum is driving research into biocathodes as an alternative. Other materials include membranes (although some MECs are membraneless), and tubing and gas collection systems.〔(Green Car )〕
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