The　volatile　boron　species　from　sealing　glass-ceramics　have　a　significant　poisoning　effect　on　the　electrochemical　activity　of　Solid　Oxide　Fuel　Cell　(SOFC)　cathodes.　The　reaction　between　boron-containing　sealing　glass-ceramics　and　cathodes　thus　presents　a　challenge　for　the　development　of　SOFC.　Here　we　report　for　the　first　time　that　the　addition　of　La2O3　can　significantly　reduce　the　boron　volatility　from　sealing　glass-ceramics　and　consequently　the　formation　of　LaBO3　in　reaction　couple　between　glass　and　(La,Sr)(Co,Fe)O-3　(LSCF)　cathode.　In　particular,　the　boron　volatility　can　be　reduced　by　about　6　times　with　the　addition　of　4　mol.%La2O3　(3.7　x　10(-3)　vs.　0.6　x　10(-3)%).　The　addition　of　La2O3　condenses　the　structure　of　glasses　and　glass-ceramics,　contributing　to　the　decrease　in　boron　volatility　from　glass-ceramics.　In　addition,　La2O3　dopant　favors　the　formation　of　boron-containing　phase　(La5SiBO13)　in　glass-ceramics,　which　dramatically　reduces　the　boron　volatility.　The　reported　results　provide　an　effective　approach　for　solving　the　sealing　challenge.　(C)　2015　Elsevier　Ltd.　All　rights　reserved.