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Molybdenum Carbide-Embedded Nitrogen-Doped Porous Carbon Nanosheets as Electrocatalysts for Water Splitting in Alkaline Media
ACS Nano ( IF 15.8 ) Pub Date : 2017-03-20 00:00:00 , DOI: 10.1021/acsnano.7b00365 Chenbao Lu 1, 2 , Diana Tranca 3 , Jian Zhang 3 , Fermı́n Rodrı́guez Hernández 3, 4, 5 , Yuezeng Su 2 , Xiaodong Zhuang 1 , Fan Zhang 1 , Gotthard Seifert 3 , Xinliang Feng 1, 3
ACS Nano ( IF 15.8 ) Pub Date : 2017-03-20 00:00:00 , DOI: 10.1021/acsnano.7b00365 Chenbao Lu 1, 2 , Diana Tranca 3 , Jian Zhang 3 , Fermı́n Rodrı́guez Hernández 3, 4, 5 , Yuezeng Su 2 , Xiaodong Zhuang 1 , Fan Zhang 1 , Gotthard Seifert 3 , Xinliang Feng 1, 3
Affiliation
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Molybdenum carbide (Mo2C) based catalysts were found to be one of the most promising electrocatalysts for hydrogen evolution reaction (HER) in acid media in comparison with Pt-based catalysts but were seldom investigated in alkaline media, probably due to the limited active sites, poor conductivity, and high energy barrier for water dissociation. In this work, Mo2C-embedded nitrogen-doped porous carbon nanosheets (Mo2[email protected]) were successfully achieved with the help of a convenient interfacial strategy. As a HER electrocatalyst in alkaline solution, Mo2[email protected] exhibited an extremely low onset potential of ∼0 mV and a current density of 10 mA cm–2 at an overpotential of ∼45 mV, which is much lower than the values of most reported HER electrocatalysts and comparable to the noble metal catalyst Pt. In addition, the Tafel slope and the exchange current density of Mo2[email protected] were 46 mV decade–1 and 1.14 × 10–3 A cm–2, respectively, outperforming the state-of-the-art metal-carbide-based electrocatalysts in alkaline media. Such excellent HER activity was attributed to the rich Mo2C/NPC heterostructures and synergistic contribution of nitrogen doping, outstanding conductivity of graphene, and abundant active sites at the heterostructures.
中文翻译：
碳化钼嵌入氮掺杂多孔碳纳米片作为在碱性介质中水分解的电催化剂
与基于Pt的催化剂相比，发现基于碳化钼（Mo 2 C）的催化剂是酸性介质中最有希望的氢发生反应（HER）的电催化剂之一，但由于其活性有限，因此很少在碱性介质中进行研究。的位置，较差的电导率和较高的水离解能垒。在这项工作中，借助便利的界面策略成功地实现了Mo 2 C嵌入的氮掺杂多孔碳纳米片（Mo 2 [受电子邮件保护]）。作为碱性溶液中的HER电催化剂，Mo 2 [受电子邮件保护]的起爆电位极低，约为0 mV，电流密度为10 mA cm –2在约45 mV的超电势下，该电势远低于大多数报道的HER电催化剂的值，与贵金属催化剂Pt相当。此外，Tafel斜率和受电子邮件保护的Mo 2的交换电流密度分别为46 mV·十-1和1.14×10 –3 A cm –2，优于最新的金属碳化物-碱性介质中的碱性电催化剂。如此出色的HER活性归因于丰富的Mo 2 C / NPC异质结构和氮掺杂的协同作用，出色的石墨烯电导率以及异质结构上的丰富活性位点。
更新日期：2017-03-20
中文翻译：
碳化钼嵌入氮掺杂多孔碳纳米片作为在碱性介质中水分解的电催化剂
与基于Pt的催化剂相比，发现基于碳化钼（Mo 2 C）的催化剂是酸性介质中最有希望的氢发生反应（HER）的电催化剂之一，但由于其活性有限，因此很少在碱性介质中进行研究。的位置，较差的电导率和较高的水离解能垒。在这项工作中，借助便利的界面策略成功地实现了Mo 2 C嵌入的氮掺杂多孔碳纳米片（Mo 2 [受电子邮件保护]）。作为碱性溶液中的HER电催化剂，Mo 2 [受电子邮件保护]的起爆电位极低，约为0 mV，电流密度为10 mA cm –2在约45 mV的超电势下，该电势远低于大多数报道的HER电催化剂的值，与贵金属催化剂Pt相当。此外，Tafel斜率和受电子邮件保护的Mo 2的交换电流密度分别为46 mV·十-1和1.14×10 –3 A cm –2，优于最新的金属碳化物-碱性介质中的碱性电催化剂。如此出色的HER活性归因于丰富的Mo 2 C / NPC异质结构和氮掺杂的协同作用，出色的石墨烯电导率以及异质结构上的丰富活性位点。
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