The　high　volatility　of　boron　from　borosilicate　glass　sealants　often　leads　to　boron　deposition　and　poisoning　of　La0.6Sr0.4Co0.2Fe0.8O3　(LSCF)　cathode,　presenting　a　challenge　for　the　development　of　reliable　solid　oxide　fuel　cells　(SOFCs).　In　this　paper,　we　report　that　boron　volatilization　from　borosilicate　glass　at　700　°C　can　be　significantly　suppressed　by　appropriate　NiO　dopant,　mainly　due　to　the　increase　of　Si-O-B　linkages　in　the　combining　B-O−　and　Si-O−　network.　Also,　the　formation　of　boron-containing　phase　in　NiO-doping　glass-ceramics　has　been　studied,　which　suppresses　the　reaction　between　glass　and　LSCF　cathode　after　heat　treatment　at　700　°C　for　1000　h.　Moreover,　the　change　of　crystalline　phases　leads　to　an　improvement　in　thermal　and　electrical　properties.　We　believe　that　our　findings　will　open　a　new　way　for　the　design　and　development　of　the　reliable　sealing　glass　for　SOFCs　applications.　©　2019　Elsevier　Ltd