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Controllable Sandwiching of Reduced Graphene Oxide in Hierarchical Defect‐Rich MoS2 Ultrathin Nanosheets with Expanded Interlayer Spacing for Electrocatalytic Hydrogen Evolution Reaction
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2018-10-08 , DOI: 10.1002/admi.201801093 Sayyar Ali Shah 1, 2 , Guoxing Zhu 2 , Xiaoping Shen 1, 2 , Lirong Kong 2 , Zhenyuan Ji 2 , Keqiang Xu 1 , Hongbo Zhou 2 , Jun Zhu 1 , Peng Song 1 , Chunsen Song 2 , Aihua Yuan 3 , Xuli Miao 2
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2018-10-08 , DOI: 10.1002/admi.201801093 Sayyar Ali Shah 1, 2 , Guoxing Zhu 2 , Xiaoping Shen 1, 2 , Lirong Kong 2 , Zhenyuan Ji 2 , Keqiang Xu 1 , Hongbo Zhou 2 , Jun Zhu 1 , Peng Song 1 , Chunsen Song 2 , Aihua Yuan 3 , Xuli Miao 2
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The successful designing of low‐cost and highly active electrocatalytic materials from earth‐abundant elements are favorable for the large scale production of hydrogen from water splitting. Herein, the controllable sandwiching of reduced graphene oxide (RGO) in hierarchical defect‐rich MoS2 ultrathin nanosheets (MoSGMoS) with vertical alignment and expanded interlayer spacing is synthesized by hydrothermal method. The MoSGMoS product exhibits outstanding electrocatalytic activity for hydrogen evolution reaction (HER) with an onset overpotential of 24.3 mV, low overpotentials of 72 mV at 10 mA cm−2 and 384 mV at 1300 mA cm−2, a small Tafel slope of 44.7 mV decade−1, large exchange current density of 0.67 mA cm−2, and high durability in H2SO4 solution. The HER performance of the MoSGMoS catalyst is much better than most of the reported MoS2‐based catalysts, especially in terms of onset overpotential and cathodic current density. The synergistic effect between defect‐rich MoS2 ultrathin nanosheets with hierarchical structure, vertical alignment and expanded interlayer spacing, and conductive RGO is responsible for the outstanding HER activity. This method may open a new way to grow hierarchical MoS2 nanosheets on carbonaceous materials for enhanced hydrogen production from water splitting.
中文翻译：
具有分层夹层间距的分层缺陷丰富的MoS2超薄纳米片中可还原夹心的氧化石墨烯的可控夹心结构，用于电催化氢的释放反应
由富含地球的元素成功设计出低成本，高活性的电催化材料，对于水分解制氢的大规模生产是有利的。本文通过水热法合成了可控夹层的还原石墨烯（RGO）夹在具有垂直取向和扩大层间间距的分层缺陷MoS 2超薄纳米片（MoSGMoS）中。MoSGMoS产品对氢气释放反应（HER）表现出出色的电催化活性，起始超电势为24.3 mV，10 mA cm -2的低电势为72 mV，1300 mA cm -2的电势为384 mV，Tafel斜率为44.7 mV十年-1，的0.67毫安厘米的大的交换电流密度-2，在H 2 SO 4溶液中具有很高的耐久性。MoSGMoS催化剂的HER性能比大多数已报道的基于MoS 2的催化剂要好得多，特别是在开始的超电势和阴极电流密度方面。具有层次结构，垂直排列和扩大的层间间距的富缺陷MoS 2超薄纳米片与导电RGO的协同作用是导致HER活性出色的原因。该方法可能为在碳质材料上生长分层MoS 2纳米片开辟新途径，以增强水分解产生的氢气。
更新日期：2018-10-08
中文翻译：
具有分层夹层间距的分层缺陷丰富的MoS2超薄纳米片中可还原夹心的氧化石墨烯的可控夹心结构，用于电催化氢的释放反应
由富含地球的元素成功设计出低成本，高活性的电催化材料，对于水分解制氢的大规模生产是有利的。本文通过水热法合成了可控夹层的还原石墨烯（RGO）夹在具有垂直取向和扩大层间间距的分层缺陷MoS 2超薄纳米片（MoSGMoS）中。MoSGMoS产品对氢气释放反应（HER）表现出出色的电催化活性，起始超电势为24.3 mV，10 mA cm -2的低电势为72 mV，1300 mA cm -2的电势为384 mV，Tafel斜率为44.7 mV十年-1，的0.67毫安厘米的大的交换电流密度-2，在H 2 SO 4溶液中具有很高的耐久性。MoSGMoS催化剂的HER性能比大多数已报道的基于MoS 2的催化剂要好得多，特别是在开始的超电势和阴极电流密度方面。具有层次结构，垂直排列和扩大的层间间距的富缺陷MoS 2超薄纳米片与导电RGO的协同作用是导致HER活性出色的原因。该方法可能为在碳质材料上生长分层MoS 2纳米片开辟新途径，以增强水分解产生的氢气。
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