通过μ-XAFS研究改进用于甲烷选择性降解起源的真实气体传感器。
Improvement of a Real Gas-Sensor for the Origin of Methane Selectivity Degradation by µ-XAFS Investigation.
作者信息
Wada Takahiro, Murata Naoyoshi, Suzuki Takuya, Uehara Hiromitsu, Nitani Hiroaki, Niwa Yasuhiro, Uo Motohiro, Asakura Kiyotaka
机构信息
1Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, 113-8549 Japan.
2Corporate R&D Headquarters, Fuji Electric Co., Ltd., Tokyo, 191-8502 Japan.
出版信息
Nanomicro Lett. 2015;7(3):255-260. doi: 10.1007/s40820-015-0035-7. Epub 2015 Feb 17.
We have directly investigated the chemical state of the Pd species in a real μ-gas sensor device by examining the μ-fluorescence X-ray absorption fine structure. The μ-gas sensor device was heavily damaged by a heating process in which the temperature was ill-controlled, resulting in decrease of methane selectivity. We found that the PdO in the fresh μ-gas sensor was reduced to Pd metal particles as the methane selectivity decreased. Based on the investigation results, we modified the device structure so as to heat up homogeneously. The lifetime of the sensor was then successfully increased by more than 5 years.
我们通过研究μ-荧光X射线吸收精细结构，直接调查了实际μ-气体传感器装置中钯物种的化学状态。该μ-气体传感器装置在温度控制不佳的加热过程中严重受损，导致甲烷选择性下降。我们发现，随着甲烷选择性降低，新鲜μ-气体传感器中的PdO还原为钯金属颗粒。基于调查结果，我们修改了装置结构以实现均匀加热。然后，传感器的寿命成功延长了5年以上。
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