'The beauty of this fuel source is that we are not relying on the erratic nature of the wind or the sun; we are actually re-using waste to create energy.
'So far the microbial fuel power stack that we have developed generates enough power to enable SMS messaging, web browsing and to make a brief phone call.'
However, he said that making a long call on a mobile phone is far more power hungry.
'Making a call on a mobile phone takes up the most energy but we will get to the place where we can charge a battery for longer periods.
'The concept has been tested and it works - it’s now for us to develop and refine the process so that we can develop MFCs to fully charge a battery.'
Microbial fuel cells are energy converters that turn organic matter directly into electricity by utilising the metabolism of live micro-organisms.
Dr Ieropoulos said: 'Essentially, the electricity is a by-product of the microbes’ natural life cycle, so the more they eat things like urine, the more energy they generate and for longer periods of time.'
A single microbial fuel cell is pictured. The MFCs are energy converters that turn organic matter directly into electricity by utilising the metabolism of live micro-organisms
The electricity output of MFCs is relatively small and the researchers are currently only been able to store and accumulate low levels of energy into capacitors for short charge and discharge cycles.
However they claim that this is the first time that scientists have been able to directly charge the battery of a device such as a mobile phone and it should be seen as a significant breakthrough.
They believe that their research, which was funded by the Engineering and Physical Sciences Research Council, the Gates Foundation and the Technology Strategy Board, has the potential to be installed in bathrooms.
The scientists think that the technology could be installed into domestic bathrooms int he future to harness the urine and produce sufficient electricity to power showers and lighting...or at least electric shavers.
Dr Ieropoulos said: 'We are currently bidding for funding to work alongside partners in the US and South Africa to develop a smart toilet. Watch this space.'