I read the article. I saw what they said and I do not believe them for the following reasons:
1: Looking at an anode and saying "yup not corroded" is not how you check such things.
2: If they actually wanted to check it, there are several methods, they did none of them. They include: Weighing it, killing the algae and seeing if the power output changes, trying other metals for the anodes, trying other plants instead of algae in the water.
3: If you put salt water between two anodes you will get electricity. Period. If they claim this didn't happen, and "the algae did it", you're going to have to posit some method for the algae to prevent this, while substituting their own electricity. This will require new chemistry.
4: Algae are non-polar, so I don't see how they can direct the positive and negative current toward the proper anode to make electricity.
I have read the paper. They showed photosensitivity by both autoclaving the sample and adding DMCU to prevent photosynthesis. Both reduced power production. They do suggest a component of power production is related to electrolytic activity because they observe a dark setting power production; under a light setting the power production nearly doubles.
They also discuss the possibility that the algae are just promoting the oxidation of the aluminum, but do a series of assays I don't fully understand and conclude that some of the current produced is most likely from the algae themselves.
1: Looking at an anode and saying "yup not corroded" is not how you check such things.
2: If they actually wanted to check it, there are several methods, they did none of them. They include: Weighing it, killing the algae and seeing if the power output changes, trying other metals for the anodes, trying other plants instead of algae in the water.
3: If you put salt water between two anodes you will get electricity. Period. If they claim this didn't happen, and "the algae did it", you're going to have to posit some method for the algae to prevent this, while substituting their own electricity. This will require new chemistry.
4: Algae are non-polar, so I don't see how they can direct the positive and negative current toward the proper anode to make electricity.