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A New Class of Proton Conductors with Dramatically Enhanced Stability and High Conductivity for Reversible Solid Oxide Cells

Journal Article · · Small
 [1];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2]
  1. School of Materials Science and Engineering Georgia Institute of Technology Atlanta GA 30332‐0245 USA; OSTI
  2. School of Materials Science and Engineering Georgia Institute of Technology Atlanta GA 30332‐0245 USA
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Abstract

Reversible solid oxide cells based on proton conductors (P‐ReSOCs) have potential to be the most efficient and low‐cost option for large‐scale energy storage and power generation, holding promise as an enabler for the implementation of intermittent renewable energy technologies and the widespread utilization of hydrogen. Here, the rational design of a new class of hexavalent Mo/W‐doped proton‐conducting electrolytes with excellent durability while maintaining high conductivity is reported. Specifically, BaMo(W)0.03Ce0.71Yb0.26O3‐δexhibits dramatically enhanced chemical stability against high concentrations of steam and carbon dioxide than the state‐of‐the‐art electrolyte materials while retaining similar ionic conductivity. In addition, P‐ReSOCs based on BaW0.03Ce0.71Yb0.26O3‐δdemonstrate high peak power densities of 1.54, 1.03, 0.72, and 0.48 W cm−2at 650, 600, 550, and 500 °C, respectively, in the fuel cell mode. During steam electrolysis, a high current density of 2.28 A cm−2is achieved at a cell voltage of 1.3 V at 600 °C, and the electrolysis cell can operate stably with no noticeable degradation when exposed to high humidity of 30% H2O at −0.5 A cm−2and 600 °C for over 300 h. Overall, this work demonstrates the promise of donor doping for obtaining proton conductors with both high conductivity and chemical stability for P‐ReSOCs.

Research Organization:
Georgia Institute of Technology, Atlanta, GA (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE)
DOE Contract Number:
FE0032115
OSTI ID:
2418257
Journal Information:
Small, Journal Name: Small Journal Issue: 17 Vol. 19; ISSN 1613-6810
Publisher:
Wiley
Country of Publication:
United States
Language:
English

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