Compact dynamic hydrogen electrode unit as a reference electrode for PEMFCs |
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| Affiliation: | 1. Univ. Grenoble Alpes, F-38000, Grenoble, France;2. CEA, LITEN, DEHT, F-38054, Grenoble, France;1. Electrochemical Innovation Lab, Department of Chemical Engineering, UCL, London, UK;2. Proton OnSite, Wallingford, CT, USA;1. DST HySA Infrastructure Center of Competence, Faculty of Engineering, North-West University, Potchefstroom 2520, South Africa;2. School of Electrical, Electronic and Computer Engineering, Private Bag X6001, North-West University, Potchefstroom 2520, South Africa;1. State Key Lab. of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China;2. Collaborative Innovation Center of Intelligent New Energy Vehicle, Tsinghua University, Beijing 100084, China;3. Military Vehicle Department, Army Military Transportation University, Tianjin 300161, China |
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| Abstract: | A compact and easy-handling design for the dynamic hydrogen electrode (DHE) was proposed. Before mounting in the cell, a unitized set was made by the hot-pressing of two 2 mm × 5 mm ionomer membranes, between which two PTFE-coated platinum wires were sandwiched. Before the hot-pressing, a small amount of paste composed of platinum black powder and an ionomer solution was dropped at the end of each wires. Prior to use in a PEMFC, a proper current value for the operation was found in an aqueous acid solution. Mounting of the DHE on a membrane electrode assembly (MEA) was done by local hot-pressing. The space for the mounting was only 2 mm in width between the gasket and edge of the gas diffusion electrode. The potential of the DHE fluctuated, but it was in the range of about 5 mV. A PEMFC with both the DHE and conventional RHE was operated, and the I–V performance of the PEMFC was measured. The potential difference between the conventional RHE and DHE was about 5 mV, which is due to the overpotential of the hydrogen evolution reaction at the DHE. Considering this difference, this DHE is available to monitor single electrode potentials. |
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