Synthesis and NOx sensing evaluation of hollow/porous La0.8Sr0.2MnO3 microspheres
Synthesis and NOx sensing evaluation of hollow/porous La0.8Sr0.2MnO3 microspheres
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空心/多孔La0.8Sr0.2MnO3微球的合成及NOx传感评价
DOI：
10.1039/c6ra08587c
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发表时间：
2016
期刊：
影响因子：
3.9
通讯作者：
Hajime Okawa and Seiji Takahashi
中科院分区：
文献类型：
--
作者：
Satoshi Suehiro;Hajime Okawa and Seiji Takahashi
为了改善NO气体的反应性能，我们合成了La0.8Sr0.2MnO3 （LSM）微球。研究了基于空心/多孔LSM （hp-LSM）和实心球LSM颗粒的电极制备的NOx传感器的NO传感性能。采用喷雾热解与柠檬酸炭化相结合的新工艺合成了hp-LSM颗粒。采用x射线衍射（XRD）和扫描电镜（SEM）对所得颗粒进行了表征，并利用brunauer - emmet - teller （BET）理论对其比表面积进行了估算。hp-LSM颗粒的粒径为1 ~ 3 μm，孔径为100 ~ 500 nm，最大比表面积为6.8 m2 g−1。通过阿基米德法和压汞孔隙测量法估计，hp-LSM颗粒烧结后的球团的相对密度为68%，孔径分布在100 ~ 1000 nm之间。基于hp-LSM的气敏电极比基于固体LSM的气敏电极的NO响应/恢复时间更快。这种合成方法有望广泛应用于其他材料，空心/多孔颗粒可用于气体传感器、电池和化学反应器等各种应用。
To improve the nitric oxide (NO) gas reaction properties, we synthesized microspherical La0.8Sr0.2MnO3 (LSM) particles. We investigated the NO sensing properties of NOx sensors fabricated using electrodes based on hollow/porous LSM (hp-LSM) and solid sphere LSM particles. The hp-LSM particles were synthesized using a novel process combining spray pyrolysis with carbonization using citric acid. The resulting particles were characterized by X-ray diffraction (XRD), and scanning electron microscopy (SEM), and their specific surface area was estimated using Brunauer–Emmett–Teller (BET) theory. The particle and pore size of the hp-LSM particles were estimated to be 1–3 μm and 100–500 nm, respectively, and their highest specific surface area was determined to be 6.8 m2 g−1. Sintered pellets made from hp-LSM particles had a relative density of 68% and a broad pore size distribution between 100 and 1000 nm, estimated by the Archimedes method and mercury intrusion porosimetry measurements. The hp-LSM-based gas sensing electrode exhibited a faster NO response/recovery time than the one based on solid LSM. This synthetic method is expected to be widely applicable to other materials, and hollow/porous particles may be used for various applications such as gas sensors, batteries and chemical reactors.