Exceptional power density and stability at intermediate temperatures in protonic ceramic fuel cells
Exceptional power density and stability at intermediate temperatures in protonic ceramic fuel cells
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DOI：
10.1038/s41560-017-0085-9
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发表时间：
2018-03-01
期刊：
影响因子：
56.7
通讯作者：
Haile, Sossina M.
中科院分区：
文献类型：
--
作者：
Choi, Sihyuk;Kucharczyk, Chris J.;Haile, Sossina M.
在过去的几年里，质子陶瓷燃料电池（PCFC）的演示取得了重大进展。这种燃料电池提供了环境可持续和具有成本效益的发电潜力。然而，它们的功率输出落后于基于其高电解质电导率的预测。在这里，我们克服了PCFC的性能和稳定性的挑战，采用高活性阴极，PrBa0.5Sr0.5Co1.5Fe0.5O5+ δ（PBSCF），结合化学稳定的电解质，BaZr0.4Ce0.4Y0.1Yb0.1O3（BZCYYb 4411）。我们将阴极材料的薄致密层间膜存款到电解质表面上以减轻接触电阻，这是一种通过PBSCF的质子渗透性而成为可能的方法。所得燃料电池的峰值功率密度在500摄氏度下超过500 mW cm（-2），同时还在CO2下提供卓越的长期稳定性。
Over the past several years, important strides have been made in demonstrating protonic ceramic fuel cells (PCFCs). Such fuel cells offer the potential of environmentally sustainable and cost-effective electric power generation. However, their power outputs have lagged behind predictions based on their high electrolyte conductivities. Here we overcome PCFC performance and stability challenges by employing a high-activity cathode, PrBa0.5Sr0.5Co1.5Fe0.5O5+delta (PBSCF), in combination with a chemically stable electrolyte, BaZr0.4Ce0.4Y0.1Yb0.1O3 (BZCYYb4411). We deposit a thin dense interlayer film of the cathode material onto the electrolyte surface to mitigate contact resistance, an approach which is made possible by the proton permeability of PBSCF. The peak power densities of the resulting fuel cells exceed 500 mW cm(-2) at 500 degrees C, while also offering exceptional, long-term stability under CO2.