Researchers from ETH Zürich, a public research university in Switzerland, have developed an implantable fuel cell that generates electricity from excess blood glucose, potentially powering medical devices like insulin pumps, says the university in a press release. The fuel cell, resembling a small teabag, contains a copper-based nanoparticles anode that converts glucose into gluconic acid and a proton, generating electricity. When combined with artificial beta cells, the system can autonomously regulate blood sugar levels