Hydrogen tungsten bronze as a decoking agent for long-life, natural gas-fueled solid oxide fuel cells

Daeil Yoon; Arumugam Manthiram

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Hydrogen tungsten bronze as a decoking agent for long-life, natural gas-fueled solid oxide fuel cells

机译：氢钨青铜用作长寿命天然气燃料固体氧化物燃料电池的除焦剂

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Ni catalyst-based anodes in solid oxide fuel cells (SOFCs) operating with natural gas fuel are vulnerable to coking (carbon deposition) and sulfur poisoning, resulting in impaired anodes and eventual cessation of SOFC operation. The incorporation of as small as 1 atom% W to Ni is found to overcome this formidable challenge. The hydrogen tungsten bronze (H_XWO_(3-δ) ≡ WO_(3-x_δ)(OH)_x) formed by reaction with the water vapor produced during SOFC operation supplies the hydroxyl groups to oxidize carbon and eliminate coking on the Ni surface. Mobile protons adhered to the oxide ions as well as the mobile oxide ions themselves in the AO_3 sublattice of the oxygen-deficient perovskite-type H_XWO_(3-δ) facilitate a rapid cleaning of the Ni surface. We show here that Ni-H_xWO_(3-δ)-Ce_(0.8)Gd_(0.2)O_(1.9) (GDC) anode-supported single cell SOFCs with GDC electrolyte and Ba_(0.5)Sr_(0.5)Co_(0.8)Fe_(0.2)O_(3-δ) cathode exhibit more than 200 h of stable operation with methane fuel at 650-700 ℃.

机译：使用天然气燃料的固体氧化物燃料电池（SOFC）中基于镍催化剂的阳极很容易结焦（碳沉积）和硫中毒，导致阳极受损并最终停止SOFC操作。发现将低至1原子％的W掺入Ni可以克服这一艰巨的挑战。通过与SOFC操作过程中产生的水蒸气反应形成的氢钨青铜（H_XWO_（3-δ）≡WO_（3-x_δ）（OH）_x）提供羟基以氧化碳并消除Ni表面的焦化。缺氧钙钛矿型H_XWO_（3-δ）的AO_3子晶格中附着于氧化物离子的可移动质子以及可移动的氧化物离子本身有助于快速清洁Ni表面。我们在这里显示带有GDC电解质和Ba_（0.5）Sr_（0.5）Co_（0.8）的Ni-H_xWO_（3-δ）-Ce_（0.8）Gd_（0.2）O_（1.9）（GDC）阳极支撑的单电池SOFC。 Fe_（0.2）O_（3-δ）阴极在650-700℃下与甲烷燃料一起稳定运行200小时以上。

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《Energy & environmental science》 |2014年第9期|3069-3076|共8页
作者
Daeil Yoon; Arumugam Manthiram;
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Materials Science and Engineering Program, The University of Texas at Austin, Austin, Texas 78712, USA;

Materials Science and Engineering Program, The University of Texas at Austin, Austin, Texas 78712, USA;

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Hydrogen tungsten bronze as a decoking agent for long-life, natural gas-fueled solid oxide fuel cells

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