A modified gas diffusion hydrogen anode (GDHA) was developed for electropolymerization of dichlorosilianes. This GDHA consists of three layers: an H-2 dispersion layer made of a fine glass frit, a Teflon-bound electrical conductive carbon layer, and a Pt/carbon catalyst layer. The performance of this H-2 electrode configuration, having different Pt loadings, was evaluated by electropolymerizing MePhSiCl2 at different monomer concentrations, current densities, and supplied electricities. The modified hydrogen anode is reported to yield polymethylphenylsilane with Mw=similar to 11000. The product yield, using this hydrogen electrode, approaches 99% (i.e., oligomer+polymer). (c) 2006 The Electrochemical Society.