scholarly journals Proton transport enabled by a field-induced metallic state in a semiconductor heterostructure

Science ◽  
2020 ◽  
Vol 369 (6500) ◽  
pp. 184-188 ◽  
Author(s):  
Y. Wu ◽  
B. Zhu ◽  
M. Huang ◽  
L. Liu ◽  
Q. Shi ◽  
...  
Keyword(s):  
Proton Transport ◽  
Proton Conductor ◽  
Ionic Transport ◽  
Metallic State ◽  
Fast Proton ◽  
Energy Applications ◽  
Semiconductor Heterostructure ◽  
Ceramic Fuel ◽  
Ceramic Fuel Cells ◽  
Insight Into

Tuning a semiconductor to function as a fast proton conductor is an emerging strategy in the rapidly developing field of proton ceramic fuel cells (PCFCs). The key challenge for PCFC researchers is to formulate the proton-conducting electrolyte with conductivity above 0.1 siemens per centimeter at low temperatures (300 to 600°C). Here we present a methodology to design an enhanced proton conductor by means of a NaxCoO2/CeO2 semiconductor heterostructure, in which a field-induced metallic state at the interface accelerates proton transport. We developed a PCFC with an ionic conductivity of 0.30 siemens per centimeter and a power output of 1 watt per square centimeter at 520°C. Through our semiconductor heterostructure approach, our results provide insight into the proton transport mechanism, which may also improve ionic transport in other energy applications.

Space charge layer effect at the platinum anode/BaZr0.9Y0.1O3−δ electrolyte interface in proton ceramic fuel cells

2020 ◽  
Vol 8 (25) ◽  
pp. 12566-12575
Author(s):  
Min Chen ◽  
Xiaobin Xie ◽  
Jinhu Guo ◽  
Dongchu Chen ◽  
Qing Xu
Keyword(s):  
Fuel Cells ◽  
Space Charge ◽  
Proton Conductor ◽  
Space Charge Layer ◽  
Layer Model ◽  
Charge Layer ◽  
Platinum Anode ◽  
Layer Effect ◽  
Ceramic Fuel ◽  
Ceramic Fuel Cells

Space charge layer model at the Pt anode/BZY10 proton conductor interface.

Tailoring the Oxygen Vacancy to Achieve Fast Intrinsic Proton Transport in a Perovskite Cathode for Protonic Ceramic Fuel Cells

2020 ◽  
Vol 3 (5) ◽  
pp. 4914-4922 ◽  
Author(s):  
Rongzheng Ren ◽  
Zhenhua Wang ◽  
Xingguang Meng ◽  
Xinhua Wang ◽  
Chunming Xu ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Oxygen Vacancy ◽  
Proton Transport ◽  
Ceramic Fuel ◽  
Ceramic Fuel Cells

scholarly journals Analysis of the Electrochemical Transport Properties of Doped Barium Cerate for Proton Conductivity in Low Humidity Conditions: A Review

2020 ◽  
Author(s):  
Laura I.V. Holz ◽  
Vanessa C.D. Graça ◽  
Francisco J.A. Loureiro ◽  
Duncan P. Fagg
Keyword(s):  
Proton Conductor ◽  
Barium Cerate ◽  
Separation Membranes ◽  
Operation Conditions ◽  
Hydrogenation Reactions ◽  
Low Humidity ◽  
Ceramic Fuel ◽  
Ceramic Fuel Cells ◽  
Electrochemical Transport ◽  
Doped Barium Cerate

Proton-conducting perovskites are among the most promising electrolytes for Proton Ceramic Fuel Cells (PCFCs), electrolysers and separation membranes. Particularly, yttrium-doped barium cerate, BaCe1-xYxO3-δ (BCY), shows one of the highest protonic conductivities at intermediate temperatures (σ ∼ 10−3 S cm−1 at 400°C); values that are typically achieved under humidified atmospheres (p H2O ∼ 10−2 atm). However, BCY has commonly been discarded for such applications due to its instability in the presence of water vapour and carbonaceous atmospheres. A recent discovery has shown that BCY10 exhibits pure protonic conductivity under very low humidity contents (∼10−5–10−4 atm), owing to its very high equilibrium constant for hydration. This peculiar characteristic allows this material to retain its functionally as a proton conductor in such conditions, while preventing its decomposition. Hence, this chapter explores the electrochemical properties of the BaCe0.9Y0.1O3-δ (BCY10) composition, comprehensively establishing its limiting operation conditions through defect chemistry and thermodynamic analyses. Moreover, the importance of such conditions is highlighted with respect to potential industrially relevant hydrogenation/de-hydrogenation reactions at low temperatures under low humidity.

Optimum dopant of barium zirconate electrolyte for manufacturing of protonic ceramic fuel cells

2021 ◽  
Vol 506 ◽  
pp. 230134
Author(s):  
Tomohiro Kuroha ◽  
Yoshiki Niina ◽  
Mizuki Shudo ◽  
Go Sakai ◽  
Naoki Matsunaga ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Barium Zirconate ◽  
Ceramic Fuel ◽  
Ceramic Fuel Cells

scholarly journals High-Temperature Elastic Properties of Yttrium-Doped Barium Zirconate

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 968
Author(s):  
Fumitada Iguchi ◽  
Keisuke Hinata
Keyword(s):  
High Temperature ◽  
Young’S Modulus ◽  
Elastic Properties ◽  
Measurement Method ◽  
Young's Modulus ◽  
Barium Zirconate ◽  
Shear Moduli ◽  
Ceramic Fuel ◽  
Yttrium Concentration ◽  
Ceramic Fuel Cells

The elastic properties of 0, 10, 15, and 20 mol% yttrium-doped barium zirconate (BZY0, BZY10, BZY15, and BZY20) at the operating temperatures of protonic ceramic fuel cells were evaluated. The proposed measurement method for low sinterability materials could accurately determine the sonic velocities of small-pellet-type samples, and the elastic properties were determined based on these velocities. The Young’s modulus of BZY10, BZY15, and BZY20 was 224, 218, and 209 GPa at 20 °C, respectively, and the values decreased as the yttrium concentration increased. At high temperatures (>20 °C), as the temperature increased, the Young’s and shear moduli decreased, whereas the bulk modulus and Poisson’s ratio increased. The Young’s and shear moduli varied nonlinearly with the temperature: The values decreased rapidly from 100 to 300 °C and gradually at temperatures beyond 400 °C. The Young’s modulus of BZY10, BZY15, and BZY20 was 137, 159, and 122 GPa at 500 °C, respectively, 30–40% smaller than the values at 20 °C. The influence of the temperature was larger than that of the change in the yttrium concentration.

Location of H+ sites in the fast proton-conductor (H3O)SbTeO6 pyrochlore

2005 ◽  
pp. 865 ◽  
Author(s):  
Jos� Antonio Alonso ◽  
Xavier Turrillas
Keyword(s):  
Proton Conductor ◽  
Fast Proton
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