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A robust fuel cell operated on nearly dry methane at 500 °C enabled by synergistic thermal catalysis and electrocatalysis
Nature Energy ( IF 49.7 ) Pub Date : 2018-10-29 , DOI: 10.1038/s41560-018-0262-5
Yu Chen , Ben deGlee , Yu Tang , Ziyun Wang , Bote Zhao , Yuechang Wei , Lei Zhang , Seonyoung Yoo , Kai Pei , Jun Hyuk Kim , Yong Ding , P. Hu , Franklin Feng Tao , Meilin Liu

Solid oxide fuel cells (SOFCs) are potentially the most efficient technology for direct conversion of hydrocarbons to electricity. While their commercial viability is greatest at operating temperatures of 300–500 °C, it is extremely difficult to run SOFCs on methane at these temperatures, where oxygen reduction and C–H activation are notoriously sluggish. Here we report a robust SOFC that enabled direct utilization of nearly dry methane (with ~3.5% H2O) at 500 °C (achieving a peak power density of 0.37 W cm−2) with no evidence of coking after ~550 h operation. The cell consists of a PrBa0.5Sr0.5Co1.5Fe0.5O5+δ nanofibre-based cathode and a BaZr0.1Ce0.7Y0.1Yb0.1O3–δ-based multifunctional anode coated with Ce0.90Ni0.05Ru0.05O2 (CNR) catalyst for reforming of CH4 to H2 and CO. The high activity and coking resistance of the CNR is attributed to a synergistic effect of cationic Ni and Ru sites anchored on the CNR surface, as confirmed by in situ/operando experiments and computations.



中文翻译:

强大的燃料电池可通过协同热催化和电催化作用在500°C的几乎干燥的甲烷上运行

固体氧化物燃料电池(SOFC)可能是将碳氢化合物直接转化为电能的最有效技术。尽管它们的商业生存能力在300–500°C的工作温度下最大,但在这些温度下以氧气运行CHFC和CH–H的活化反应非常缓慢的情况下,在甲烷上运行SOFC却极为困难。在这里,我们报告了一种强大的SOFC,它能够在500°C(达到0.37 W cm -2的峰值功率密度)下直接利用近乎干燥的甲烷(H 2 O含量约为3.5%),而在运行约550 h后没有结焦的迹象。 。该电池由PrBa 0.5 Sr 0.5 Co 1.5 Fe 0.5 O 5 +δ纳米纤维基阴极和BaZr组成以Ce 0.90 Ni 0.05 Ru 0.05 O 2(CNR)催化剂包覆的0.1 Ce 0.7 Y 0.1 Yb 0.1 O 3–δ基多功能阳极可将CH 4重整为H 2和CO。CNR的高活性和耐结焦性为原位/操作实验和计算证实,这归因于锚固在CNR表面上的阳离子Ni和Ru位点的协同作用。

更新日期:2019-01-25
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