Electrode Structure (1 of 2) (IMAGE) University of New South Wales Caption A scanning electron microscope image shows the porous structure of the nickel foam used to make UNSW Australia's inexpensive and efficient oxygen-producing electrode. The foam has holes in it about 200 micrometers across (Scale bar is 200 micrometers) Credit UNSW Australia Usage Restrictions In association with a report on the research License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.