Real coupling of solid oxide fuel cells with a biomass steam gasifier: Operating boundaries considering performance, tar and carbon deposition analyses

•Real coupling of biomass gasifier with solid oxide fuel cells for dozens of hours.•Stable operation for 30 h at 800 and 850°C when heavier tars are removed.•Metal dusting of nickel mesh and zirconia-based anode when using raw product gas.•Almost complete conversion of tars and benzene in the fuel cells at 800 and 850°C.•Change from pyrolytic to graphitic carbon deposition between 800 and 850°C.