Synergistic effect of A-site Nd deficiency and B-site Mo doping in NdBaCo2O5+δ for enhancing electrochemical performance of solid oxide electrolysis cells

IF 2.9 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materialia Pub Date : 2026-05-01 Epub Date: 2026-03-29 DOI:10.1016/j.mtla.2026.102734

Xujie Liu , Changling Quan , Qiyue Wang , Yan Shao , Baocheng Shi , Ting Yan , Binxia Yuan , Zaiguo Fu

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Abstract

The delamination caused by thermal expansion mismatch between the anode and electrolyte in solid oxide electrolysis cells (SOECs) significantly restricts overall performance. The double perovskite materials Nd_0.98BaCo_2-yMo_yO_5+δ (Nd_0.98BCMo_y, y = 0.03–0.07) were synthesized as oxygen electrodes of SOECs. Synergistic modification of A-site Nd deficiency and B-site Mo doping was adopted to improve the thermal expansion coefficient (TEC) and electrical conductivity of the NdBaCo₂O_5+δ (NBC). Specifically, Nd_0.98BaCo_1.93Mo_0.07O_5+δ exhibited a TEC of 13.94 × 10^–6 K^-1 and electrical conductivity of 235 S·cm^-1 at 800 °C, which were markedly superior to NBC. Thermogravimetric analysis further confirmed that the modified samples exhibited excellent thermal stability. In terms of electrochemical performance, the symmetric cell with Nd_0.98BCMo_0.03 exhibited a polarization resistance of 0.027 Ω·cm² at 800 °C. A single cell utilizing this material as the oxygen electrode delivered a current density of 875.48 mA·cm^-2 at 800 °C under 1.5 V, corresponding to a theoretical hydrogen production rate of 365.95 ml·cm^-2·h^-1. These attractive properties demonstrate that the synergistic modification through A-site deficiency and B-site doping can effectively enhance NBC, offering a new strategy for developing oxygen electrode materials for solid oxide electrolysis cells.

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NdBaCo2O5+δ中a位Nd缺乏和b位Mo掺杂对提高固体氧化物电解电池电化学性能的协同效应

在固体氧化物电解电池（soec）中，阳极和电解质之间的热膨胀不匹配导致的分层严重限制了整体性能。合成了双钙钛矿材料Nd0.98BaCo2-yMoyO5+δ (Nd0.98BCMoy, y = 0.03-0.07)作为soec的氧电极。采用a位Nd缺乏和b位Mo掺杂的协同修饰，提高了NdBaCo2O5+δ (NBC)的热膨胀系数（TEC）和电导率。其中，nd0.98 baco1.93 mo0.070 o5 +δ在800℃时的TEC为13.94 × 10-6 K-1，电导率为235 S·cm-1，明显优于NBC。热重分析进一步证实了改性后的样品具有优异的热稳定性。在电化学性能方面，含有Nd0.98BCMo0.03的对称电池在800℃时的极化电阻为0.027 Ω·cm2。使用该材料作为氧电极的单个电池在800℃、1.5 V下的电流密度为875.48 mA·cm-2，对应的理论产氢率为365.95 ml·cm-2·h-1。这些有吸引力的性质表明，通过a位缺失和b位掺杂的协同修饰可以有效地增强NBC，为固体氧化物电解电池氧电极材料的开发提供了新的策略。

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来源期刊

Materialia MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

6.40

自引率

2.90%

发文量

345

审稿时长

36 days

期刊介绍： Materialia is a multidisciplinary journal of materials science and engineering that publishes original peer-reviewed research articles. Articles in Materialia advance the understanding of the relationship between processing, structure, property, and function of materials. Materialia publishes full-length research articles, review articles, and letters (short communications). In addition to receiving direct submissions, Materialia also accepts transfers from Acta Materialia, Inc. partner journals. Materialia offers authors the choice to publish on an open access model (with author fee), or on a subscription model (with no author fee).