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| 1 | Statistical morphological identification of low-dimensional nanomaterials by using TEM显示文摘Nanomaterials with low-dimensional morphology display unique properties in catalysis and related fields,which are highly dependent on the structure and aspect ratio.Thus,accurate identification of the structure and morphology is the basis to correlate to the performance.However,the widely adopted techniques such as XRD is incapable to precise identify the aspect ratio of low-dimensional nanomaterials,not even to quantify the morphological uniformity with statistical deviation value.Herein,ZnO nanorod and nanosheet featured with one-and two-dimensional morphology were selected as model materials,which were prepared by the hydrothermal method and statistically characterized by transmission electron microscopy(TEM).The results indicate that ZnO nanorods and nanosheets display rod-like and orthohexagnal morphology,which mainly encapsulated with{100}and{001}planes,respectively.The 7.36±0.20 and 0.39±0.02 aspect ratio(c/a)of ZnO nanorods and nanosheets could be obtained through the integration of the(100)and(002)diffraction rings in selected area electron diffraction(SAED).TEM combining with the SAED is favorable compare with XRD,which not only provides more accurate aspect ratio results with standard deviation values but also requires very small amounts of sample.This work is supposed to provide a convenient and accurate method for the characterization of nanomaterials with low-dimensional morphology through TEM. | Yinghui Pu Yiming Niu Yongzhao Wang Siyang Liu Bingsen Zhang | 2022 | Particuology2022，20，2： | 1 |
| 2 | 基于WO_(3)阵列的高效PEM电解水铱负载电极显示文摘PEM电解水阳极面临高电位强氧化的环境,同时受限于金属铱的高昂价格,开发低成本、高活性与稳定性的析氧电极面临巨大挑战。本文通过操作简单的浸渍法在WO_(3)阵列表面进行铱负载,得到的Ir@WO_(3)电极在PEM电解水析氧电极中具有较高的活性与应用化价值。通过优化铱前驱体的浸渍量,当载量为0.15 mg_(Ir)·cm^(-2)时,电极呈无序多孔结构,铱在电极表面均匀分布。单电解池测试膜电极2.0 V下性能达到2.3 A·cm^(-2),此时铱质量比活性提高至15.5 A·g_(Ir)^(-1),传质极化区域tafel斜率降低至360 mV·dec^(-1);相比商业化铱黑喷涂电极,WO_(3)阵列载体的电极在提高催化剂质量活性与降低电极的传质极化方面具有优势。本研究提供的电极制备方法与性能研究思路对于发展低成本高活性PEM电解水膜电极具有一定的价值。 | 姜广 迟军 姚德伟 俞红梅 邵志刚 刘聪 尹立坤 高学强 | 2022 | 汽车工程2022，44，4： | 0 |
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