Inventors in Australia are working on micro-electromechanical systems technology that could provide a miniature power source to replace batteries in portable electronic devices. These micro-electromechanical systems (MEMS) use fuels such as hydrogen or butane to spin a tiny turbine at very high speeds -- as much as 2 million RPM. The spinning of the turbine is then used to generate electricity that powers the device.
This is a potential contender for replacing batteries and could compete with micro fuel cell technology that is now emerging. One advantage of micro-electromechanical systems technology is that it can also be powered by hydrogen, just like fuel cells, meaning that the exhaust would be primarily water. The drawback is that the fuel source for MEMS systems is flammable, meaning that such portable power devices may not be allowed on airplanes or other places where explosives might pose a safety risk.
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