In　planar　Solid　Oxide　Fuel　Cells　(SOFCs),　the　boron　species　volatilize　from　glass　seals,　and　react　with　lanthanum-containing　cathodes　(i.e.,　La0.6Sr0.4Co0.2Fe0.8O3 − δ,　LSCF)　to　form　LaBO3　under　cathodic　polarization,　which　decomposes　the　perovskite　structure　and　consequently　decreases　the　electrochemical　activity　of　cathode.　In　this　study,　Nb2O5　and　Gd2O3　are　added　to　an　aluminoborosilicate　glass　to　reduce　the　boron　volatility　from　glass　and　the　reaction　between　sealing　glass　and　LSCF　cathode.　Both　Nb2O5　and　Gd2O3　doping　increases　the　network　connectivity,　but　Nb2O5　doping　enhances　the　[BO3] → [BO4]　transition　and　reduces　the　boron　volatility　from　glass　seals,　thus　effectively　suppressing　the　deposition　and　poisoning　of　boron　contaminants　on　the　LSCF　cathode.　However,　an　obvious　degradation　of　the　electrocatalytic　activity　of　LSCF　occurs　in　the　presence　of　Gd2O3-doped　glass.　The　relationship　between　glass　structure　and　glass/cathode　interaction　has　been　established　to　provide　useful　information　for　designing　stable　sealing　materials　for　SOFC　applications.　©　2016　Elsevier　Ltd