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Defect-Rich Heterogeneous MoS2/rGO/NiS Nanocomposite for Efficient pH-Universal Hydrogen Evolution.


ABSTRACT: Molybdenum disulfide (MoS2) has been universally demonstrated to be an effective electrocatalytic catalyst for hydrogen evolution reaction (HER). However, the low conductivity, few active sites and poor stability of MoS2-based electrocatalysts hinder its hydrogen evolution performance in a wide pH range. The introduction of other metal phases and carbon materials can create rich interfaces and defects to enhance the activity and stability of the catalyst. Herein, a new defect-rich heterogeneous ternary nanocomposite consisted of MoS2, NiS and reduced graphene oxide (rGO) are synthesized using ultrathin αNi(OH)2 nanowires as the nickel source. The MoS2/rGO/NiS-5 of optimal formulation in 0.5 M H2SO4, 1.0 M KOH and 1.0 M PBS only requires 152, 169 and 209 mV of overpotential to achieve a current density of 10 mA cm-2 (denoted as η10), respectively. The excellent HER performance of the MoS2/rGO/NiS-5 electrocatalyst can be ascribed to the synergistic effect of abundant heterogeneous interfaces in MoS2/rGO/NiS, expanded interlayer spacings, and the addition of high conductivity graphene oxide. The method reported here can provide a new idea for catalyst with Ni-Mo heterojunction, pH-universal and inexpensive hydrogen evolution reaction electrocatalyst.

SUBMITTER: Liu G 

PROVIDER: S-EPMC8001468 | biostudies-literature | 2021 Mar

REPOSITORIES: biostudies-literature

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Defect-Rich Heterogeneous MoS<sub>2</sub>/rGO/NiS Nanocomposite for Efficient pH-Universal Hydrogen Evolution.

Liu Guangsheng G   Thummavichai Kunyapat K   Thummavichai Kunyapat K   Lv Xuefeng X   Chen Wenting W   Lin Tingjun T   Tan Shipeng S   Zeng Minli M   Chen Yu Y   Wang Nannan N   Zhu Yanqiu Y  

Nanomaterials (Basel, Switzerland) 20210308 3


Molybdenum disulfide (MoS<sub>2</sub>) has been universally demonstrated to be an effective electrocatalytic catalyst for hydrogen evolution reaction (HER). However, the low conductivity, few active sites and poor stability of MoS<sub>2</sub>-based electrocatalysts hinder its hydrogen evolution performance in a wide pH range. The introduction of other metal phases and carbon materials can create rich interfaces and defects to enhance the activity and stability of the catalyst. Herein, a new defe  ...[more]

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