Tuning electrochemical and transport processes to achieve extreme performance and efficiency in solid oxide cells
Tuning electrochemical and transport processes to achieve extreme performance and efficiency in solid oxide cells
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DOI：
10.1039/d0ta04555a
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发表时间：
2020-06
影响因子：
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通讯作者：
B. Park;R. Scipioni;Qian Zhang;D. Cox;P. Voorhees;S. Barnett
中科院分区：
文献类型：
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作者：
B. Park;R. Scipioni;Qian Zhang;D. Cox;P. Voorhees;S. Barnett
固体氧化物电池(SOCs)作为燃料电池和电解槽有着重要的应用。可再生电力的储存应用也变得越来越重要；然而，很难满足实现所需效率和成本所需的严格的特定区域电阻和长期稳定目标。在这里，我们展示了一种新的SOC，它利用了非常薄的Gd掺杂CeO2/YSZ双层电解液，具有增强的孔隙率的Ni-YSZ电池载体，使用PROX和GDC纳米催化剂对电极进行表面修饰，以获得前所未有的低ASR值<；0.1Ωcm2，燃料电池功率密度∼3 W cm−2，以及800°C下的电解电流密度∼4 A cm−2。使用一种新的阻抗减法进行的电化学阻抗谱分析表明，限速电极过程如何受到新的SOC材料和设计的影响。
Solid oxide cells (SOCs) have important applications as fuel cells and electrolyzers. The application for storage of renewable electricity is also becoming increasingly relevant; however, it is difficult to meet stringent area-specific resistance (ASR) and long-term stability targets needed to achieve required efficiency and cost. Here we show a new SOC that utilizes a very thin Gd-doped ceria (GDC)/yttria-stabilized zirconia (YSZ) bi-layer electrolyte, Ni–YSZ cell support with enhanced porosity, and electrode surface modification using PrOx and GDC nanocatalysts to achieve unprecedented low ASR values < 0.1 Ω cm2, fuel cell power density ∼3 W cm−2, and electrolysis current density ∼4 A cm−2 at 800 °C. Besides this exceptionally high performance, fuel cell and electrolysis life tests suggest very promising stability in fuel cell and steam electrolysis modes. Electrochemical impedance spectroscopy analysis done using a novel impedance subtraction method shows how rate-limiting electrode processes are impacted by the new SOC materials and design.