High performance electrodes for an advanced intermittently operated 10-kw alkaline water electrolyzer

摘要

A 10-kW electrolyzer was modified to be used as a technology carrier for components of advanced, intermittently operated alkaline water electrolysis. Activated Mo-containing Raney nickel cathodes and Raney nickel/ Co_3O_4 matrix composite anodes of 600 cm~2 sie produced by the vacuum plasma spraying (VPS) technology were Used as electrodes in a bipolar electrolyzer of 'zero gap" configuration. During various operation modes (constant Operation, intermittent operation with and without a protective current during electrolysis standstill) the cell voltage Was monitored over a period of 15, 000 hours. The electrode performance was studied by measuring temperature- Dependent polarization curves.