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1D/2D Heterostructures as Ultrathin Catalysts for Hydrogen Evolution Reaction
Small ( IF 13.0 ) Pub Date : 2020-10-13 , DOI: 10.1002/smll.202004296
Zhixing Lu 1, 2 , Dan Liang 3 , Xiaofan Ping 2 , Lei Xing 2 , Zechao Wang 4 , Liyuan Wu 3 , Pengfei Lu 3 , Liying Jiao 2
Small ( IF 13.0 ) Pub Date : 2020-10-13 , DOI: 10.1002/smll.202004296
Zhixing Lu 1, 2 , Dan Liang 3 , Xiaofan Ping 2 , Lei Xing 2 , Zechao Wang 4 , Liyuan Wu 3 , Pengfei Lu 3 , Liying Jiao 2
Affiliation
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2D MoS2 has emerged as a promising alternative to Pt‐based catalysts for hydrogen evolution reaction (HER) due to its low cost and earth abundance. However, insufficient active sites of basal plane and poor conductivity become the foremost factors restricting the catalytic performance of MoS2. Here, a facile strategy is presented to enhance the HER performance of MoS2 by converting its 2D structure into 1D/2D heterostructures of Mo6Te6/MoS2(1−x)Te2x by the in situ tellurization. As‐prepared 1D/2D heterostructures exhibit excellent HER performance with the Tafel slope of ≈56 mV dec−1 (only one‐third of that for pristine MoS2). The enhanced HER catalytic activity is attributed to more Te/S vacancies introduced by tellurization, which serve as the active sites as suggested by theoretical calculations. Besides, the formation of highly conductive well‐aligned quasi‐1D Mo6Te6 nanobelts facilitate charge transport in HER. Previous work provides a facile approach to construct mixed dimensional materials, and opens up a new avenue to the properties modulation of 2D transition metal chalcogenides.
中文翻译：
1D / 2D异质结构作为超薄催化剂用于氢生成反应
二维MoS 2由于其低成本和丰富的地球资源，已成为有潜力的基于Pt的氢发生反应（HER）催化剂的替代品。然而，基面的活性位点不足和导电性差成为限制MoS 2催化性能的首要因素。在此，提出了一种通过原位碲化将MoS 2的2D结构转换为Mo 6 Te 6 / MoS 2（1- x） Te 2 x的1D / 2D异质结构的方法，以增强MoS 2的HER性能。制备的1D / 2D异质结构在≈56mV dec -1的Tafel斜率下表现出出色的HER性能（仅原始MoS 2的三分之一）。HER催化活性的提高归因于碲化引入的更多Te / S空位，如理论计算所表明的那样，它们是活性位点。此外，高导电性良好排列的准1D Mo 6 Te 6纳米带的形成促进了HER中的电荷传输。先前的工作为构造混合尺寸的材料提供了一种简便的方法，并为2D过渡金属硫属元素化物的性能调节开辟了一条新途径。
更新日期：2020-11-06
中文翻译：
1D / 2D异质结构作为超薄催化剂用于氢生成反应
二维MoS 2由于其低成本和丰富的地球资源，已成为有潜力的基于Pt的氢发生反应（HER）催化剂的替代品。然而，基面的活性位点不足和导电性差成为限制MoS 2催化性能的首要因素。在此，提出了一种通过原位碲化将MoS 2的2D结构转换为Mo 6 Te 6 / MoS 2（1- x） Te 2 x的1D / 2D异质结构的方法，以增强MoS 2的HER性能。制备的1D / 2D异质结构在≈56mV dec -1的Tafel斜率下表现出出色的HER性能（仅原始MoS 2的三分之一）。HER催化活性的提高归因于碲化引入的更多Te / S空位，如理论计算所表明的那样，它们是活性位点。此外，高导电性良好排列的准1D Mo 6 Te 6纳米带的形成促进了HER中的电荷传输。先前的工作为构造混合尺寸的材料提供了一种简便的方法，并为2D过渡金属硫属元素化物的性能调节开辟了一条新途径。
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