Study On The Performance Of Solid Oxide Battery Based On Proton Conductor

The Solid Oxide Cell（SOC）is a clean and efficient energy conversion device,divided into two forms,one is the Solid Oxide Fuel Cell（SOFC）,which converts chemical energy into electrical energy through electrochemical reactions;the other is the Solid Oxide Electrolytic Cell（SOEC）,which uses water vapor as raw material,uses electrical and thermal energy to prepare hydrogen and converts electrical energy into chemical energy for storage,and is the inverse operating device of the solid oxide fuel cell.The main research work of this paper is as follows.（1）The effects of different transition metal oxides Ni O levels on the density and electrochemical properties of yttrium-doped barium cerate(Ba Ce_0.8Y_0.2O_3-δ,BCY)proton conductors were investigated.The results show that the composite Ni O can effectively increase the density and proton conductivity of BCY and thus the performance of the SOFC based on BCY as the electrolyte material.BCY+2Ni O has the highest density and proton conductivity,and the SOFC based on BCY+2Ni O electrolyte has the best electrochemical performance.This suggests that the optimum content of Ni O additive in our case is 2 mol%.（2）To achieve high performance for use in solid oxide electrolytic cells（SOEC）,the effect of different levels of the transition metal oxide nickel monoxide on the proton electrolyte Ba Zr_1-xY_xO_3-δ（BZY）energy was investigated.Specifically,BZY-x mol%Ni O（x=0,0.5,1,2 and 3,named BZY,BZY+0.5Ni O,BZY+1Ni O,BZY+2Ni O and BZY+3Ni O respectively）composite electrolyte materials were characterized for their crystal structure,morphology,and electrochemical properties.The results show that the composite Ni O contributes to the effective enhancement of the densities of BZY prepared at 1400℃,significantly improves the proton conductivity of BZY,and promotes the performance of BZY-based SOECs.Among them,2 mol%Ni O-BZY performs best with the highest density and the lowest electrochemical impedance.The SOECs based on BZY+2Ni O electrolytes have better electrochemical performance.（3）The proton conductor electrolyte material Ba Zr_0.8Y_0.2O_3-δ（BZY20-Sm_x,x=0,0.05,0.10,and 0.15）was synthesized by doping Sm ions into the proton conductor electrolyte material Ba Zr_0.8Y_0.2-xSm_xO_3-δto enhance the conductivity of the material and hence the electrolytic performance of the electrolytic cell.The results show that the grain size of the BZY20 electrolyte material becomes uniform,the lattice parameters become smaller and the conductivity is significantly enhanced when the doping of Sm is x=0.05.The SOEC prepared based on this electrolyte had an electrolytic current of 0.31 A cm²at 650℃and 1.5 V and a hydrogen production rate of 129.58 ml/cm²h,significantly higher than that of the SOEC prepared based on BZY20 electrolyte material.This shows that doping a certain percentage of Sm into BZY20 can also enhance the electrical conductivity and thus the electrochemical performance of the corresponding SOEC.