21. Main types of gold nanoparticle based biosensors are optical and electrochemical biosensor. 22. The energies of transitions correlate with the order of the electrochemical series. 23. It is also an experimental method of characterizing electrochemical systems. 24. See Battery Chemistries for a list of other electrochemical systems. 25. A related rechargeable specific energies of all presently known electrochemical power sources. 26. In minerals such as photoexcitation or by electrochemical poising at negative potentials. 27. HF is a reactive solvent in the electrochemical fluorination of organic compounds. 28. Other methods of producing titanium hydride include electrochemical and ball milling methods. 29. Electrochemical measurements show that TTF can be oxidized twice reversibly:30. In 1947, 3M began producing PFOA by electrochemical fluorination.