The　volatile　boron　from　boron-containing　sealing　materials　often　reacts　with　lanthanum-containing　cathode,　leading　to　the　formation　of　LaBO3　and　consequently　significant　degradation　of　cathode.　The　reaction　between　boron-containing　sealing　glass-ceramics　and　lanthanum-containing　cathode　thus　presents　a　challenge　for　the　development　of　solid　oxide　fuel　cell　(SOFC).　Here　we　report　for　the　first　time　that　such　a　reaction　can　be　significantly　reduced　by　Bi2O3　dopant　in　sealing　glass-ceramics.　In　particular,　the　formation　of　LaBO3　can　be　prohibited　in　reaction　couple　between　glass　containing　9　mol.%　Bi2O3　and　lanthanum　strontium　cobalt　ferrite　(LSCF)　cathode.　The　addition　of　Bi2O3　enhances　the　[BO3]　-＞　[BO4]　transition　in　glass　structure　and　therefore　improves　the　thermal　stability　of　boron　species　in　glass　matrix.　In　addition,　Bi2O3　dopant　also　favors　the　formation　of　BiBO3,　which　dramatically　reduces　boron　volatility　from　sealing　glass-ceramics.　The　reported　results　provide　an　effective　approach　for　solving　the　sealing　challenge.　(C)　2014　Elsevier　Ltd.　All　rights　reserved.