Using waste streams to generate fuels is a good idea. But human urine….? Researchers at the Ohio University have a
rational approach: the energy needed to break hydrogen away from urine is lower than the energy you need to break up water.
Botte says the idea came to her several years ago at a conference on fuel cells, where they were discussing how to turn clean water into clean power. ‘I wondered how we could do this better,’ she adds – so started looking at waste streams as a better source of molecules from which to produce hydrogen.
Urine’s major constituent is urea, which incorporates four hydrogen atoms per molecule – importantly, less tightly bonded than the hydrogen atoms in water molecules. Botte used electrolysis to break the molecule apart, developing an inexpensive new nickel-based electrode to selectively and efficiently oxidise the urea. To break the molecule down, a voltage of 0.37V needs to be applied across the cell – much less than the 1.23V needed to split water.
About Herman
Herman Wagter is one of the founders and co-editor of Dadamotive. His work as interim manager and consultant (Citynet Amsterdam/Fiber-to-the-Home, Platform Sustainable Mobility) has involved him directly in the impact of hyperconnectivity and sustainability on society. As an independent agent and "mobile warrior" he has experienced the pro's and con's of how organizations and projects can be structured, and what the effects on the final result can be. In his opinion we are entering an era of profound change, driven by these fundamental forces. Following the trends, discovering the fun and debunking the half-truths is a passion he likes to share with others.
