Three‐Dimensional Graphene@Carbon Nanotube Aerogel‐Supported Layered MoS2/Co9S8 Composite as an Efficient pH‐Universal Electrocatalyst for Hydrogen Evolution,ChemElectroChem

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Three‐Dimensional Graphene@Carbon Nanotube Aerogel‐Supported Layered MoS2/Co9S8 Composite as an Efficient pH‐Universal Electrocatalyst for Hydrogen Evolution
ChemElectroChem ( IF 3.5 ) Pub Date : 2018-12-07 , DOI: 10.1002/celc.201801403
Yuan‐Sheng Cheng ₁ , Min Ling ₂ , Bin‐Bin Jiang ₃ , Fang‐Hui Wu ₁ , Zi‐Hao Zhao ₁ , Xiao‐Ning Li ₁ , Peng‐Fei He ₁ , Xian‐Wen Wei ₁

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Developing high‐performance non‐noble‐metal electrocatalysts for the hydrogen evolution reaction (HER), which can be stably operated under various conditions is highly required in realistic production. In this work, a hierarchical architecture consisting of MoS₂ and Co₉S₈ anchored on a reduced graphene oxide (rGO) substrate was first synthesized, then by introducing blank graphene oxide (GO) and multi‐walled carbon nanotubes (CNTs), interconnected three‐dimensional (3D) composite aerogels with high conductivity were obtained, showing a high activity for the HER, with low overpotentials (η₁₀) at about 90 mV (0.5 M H₂SO₄), 176 mV (1.0 M PBS), and 102 mV (1.0 M KOH). The high performance might be caused by special hierarchical 3D structures maximally exposing the active edges of both MoS₂ and Co₉S₈. Additionally, 3D MoS₂/Co₉S₈/rGO‐CNTs showed a superior stability and could work stably under different conditions for more than 20 h or 1000 cycles, which is attributed to the good crystallinity after annealing, the highly symmetrical structures between Co₉S₈ and MoS₂, and robust protection provided by the 3D carbon substrate. The results presented herein may provide an eﬀective way to develop non‐noble‐metal electrocatalysts for different fields including the HER.

中文翻译：

三维石墨烯@碳纳米管气凝胶支撑的MoS2 / Co9S8层状复合材料，可作为高效的pH通用的氢分解电催化剂

实际生产中非常需要开发用于氢气析出反应（HER）的高性能非贵金属电催化剂，该催化剂可以在各种条件下稳定运行。在这项工作中，首先合成了由锚固在还原氧化石墨烯（rGO）衬底上的MoS ₂和Co ₉ S ₈组成的分层体系结构，然后通过引入空白的氧化石墨烯（GO）和多壁碳纳米管（CNT）相互连接获得三维（3D）具有高导电性复合材料的气凝胶，显示了HER高活性，具有低的超电势（η ₁₀）在约90毫伏（0.5 MH ₂ SO ₄），176 mV（1.0 M PBS）和102 mV（1.0 M KOH）。高性能可能是由于特殊的分层3D结构最大程度地暴露了MoS ₂和Co ₉ S ₈的活动边缘而引起的。此外，3D MoS ₂ / Co ₉ S ₈ / rGO-CNTs表现出优异的稳定性，并且可以在不同条件下稳定运行超过20 h或1000个循环，这归因于退火后良好的结晶度，Co之间的高度对称结构₉ S ₈和MoS ₂以及3D碳基材提供的强大保护。本文介绍的结果可能为开发适用于包括HER在内的不同领域的非贵金属电催化剂提供了一种有效的方法。

更新日期：2018-12-07

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