Carbon-fiber microelectrodes are the standard for neurochemical measurements, but improvements can be made for both sensitivity and spatial resolution. In this talk, I will cover how principles of thin layer cell electrochemistry are driving the design of new carbon electrodes. Specifically, electrodes that have roughness on the micron scale or cavities that trap dopamine are useful for enhancing the sensitivity and selectivity of electrodes. Three examples will be discussed, CNT yarn electrodes, cavity carbon nanopipettes, and 3D printed electrodes. These examples show how new technology, combined with a fundamental understanding of electrochemistry, is pushing development of better electrodes for neurochemistry.