Donglin Han 교수

A Y content of around 20 mol% and a Ba content approaching unity are essential for excellent sinterability, high ionic conductivity, and a high transport number of ionic conduction in Y-doped BaZrO₃.

Abstract Proton conducting Y‐doped BaZrO 3 , BaCeO 3 and their solid solutions are receiving increasing attention due to their promising application as electrolytes in ceramic fuel cells and electrolysis cells. However, the literature indicates a clear tendency that the performance of the cells increases with increasing Ce content in the electrolyte. In this work, to elucidate this phenomenon, a systematic work is performed on investigating the phase, hydration, and transport behaviors of BaZr 0

Y‐doped BaZrO 3 ( BZY ) is a promising candidate as an electrolyte in fuel cells, and attracts increasing attention. In this work, a systematic investigation was performed on microstructure, proton concentration, proton conductivity, and hydration induced chemical expansion in Y‐doped BaZrO 3 . The results revealed that the bimodal microstructure in BaZr 0.85 Y 0.15 O 3−δ was composed of large grains with composition close to the nominal value, and fine grains with large compositional discrepanc

Thulium imparts BaZrO₃ with the highest proton conductivity. A good correlation exists between proton conductivity and the chemical expansion effect as a result of the incorporation of protons.

Y-doped BaZrO₃ (BZY) is currently the most promising proton-conductive ceramic-type electrolyte for application in electrochemical devices, including fuel cells and electrolyzer cells. However, owing to its refractory nature, sintering additives, such as NiO, CuO, or ZnO are commonly added to reduce its high sintering temperature from 1600 °C to approximately 1400 °C. Even without deliberately adding a sintering additive, the NiO anode substrate provides another source of the sinterin

Nickel (Ni) is expected to be an attractive anode material for protonic ceramic fuel cells using Y-doped BaZrO3 (BZY) as an electrolyte, since Ni shows good catalytic properties for the anode reaction, and NiO is a sintering aid for BZY. In this work, a systematic investigation has been performed to reveal the influence of Ni incorporation on structural and electrochemical properties of BZY. Then, some new knowledge was obtained; the important point is that Ni cations occupy the interstitial pos

Y-doped BaZrO3 (BZY) is of the perovskite structure (ABO3), and is promising as an electrolyte in protonic ceramic fuel cells (PCFCs). However, factors limiting its protonic conductivity have not been clarified entirely, such as the unclear site occupancy of Y. In this work, X-ray diffraction patterns were collected utilizing synchrotron radiation with an incident energy close to the energy of the Y K absorption edge. Therefore, precise Rietveld refinement was performed to determine the site occ

Abstract Fuel cells can efficiently convert the chemical energy in fuels like hydrogen and methane into electricity and are an important component for the forthcoming hydrogen society. Compared with conventional solid oxide fuel cells (SOFCs) and proton exchange membrane fuel cells (PEMFCs), protonic ceramic fuel cells (PCFCs) using proton conducting solid oxides as the electrolyte operate at intermediate temperature (400–700 °C), enabling the reduction in cost by using inexpensive catalysts and

Rare earth‐doped BaZrO 3 is a very attractive material in electrochemical applications due to its proton conductive property. In this work, powder X ‐ray diffraction patterns of BaZr 0.8 M 0.2 O 3−δ (M = Sc, Eu, Sm, Dy) were collected using synchrotron radiation, and also using characteristic X ‐ray of Cu K α in dry and wet atmospheres at high temperature. Then, a combined interpretation of the diffraction patterns was established by using Rietveld refinement. The results revealed that an obviou

Precisely controlling BaO activity and improving the compositional homogeneity of BZY20 suppress effectively formation of second phases of BaY₂NiO₅ and Y₂O₃.