An electrochemical fuel cell includes a membrane-electrode assembly having a cathode face and an anode face. Peracetic acid can be produced at a controlled rate to meet the demands of a downstream operation. A capacitance is generated between the antenna-side control electrode and an open end of the radiating electrode, and the antenna-side control electrode electrically floats. The SoC can also include an encryption module, such as a block cipher based on the Advanced Encryption Standard. The multichannel optical coherence tomographic methods can be incorporated into an endoscopic probe for imaging a patient. The electrode for the PDP includes a metal ceramic thin film formed between a metal electrode and a dielectric substrate.