O species-decorated graphene shell encapsulating iridium–nickel alloy as an efficient electrocatalyst towards hydrogen evolution reaction

文献情報

出版日 2019-06-06

DOI 10.1039/C9TA04361F

インパクトファクター 12.732

著者

Shipeng Gong, Changlai Wang, Peng Jiang, Kang Yang, Jian Lu, Minxue Huang, Shi Chen, Junzheng Wang

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要旨

In comparison to other electrocatalysts, graphene possesses two distinguished merits of superior electrical conductivity and anticorrosion performance. However, graphene and graphene oxide are electrocatalytically inert in hydrogen evolution reaction (HER) due to their electronic properties. Herein, for the first time, we report a highly active and stable graphene oxide electrocatalyst for the HER. The graphene oxide-encapsulated IrNi alloy catalyst (IrNi@OC) was prepared via the pyrolysis of Ir-doped Ni-BTC, which exhibited an excellent electrocatalytic activity for the HER, achieving 100 mA cm−2 at a low overpotential of 95 mV in 0.5 M H2SO4 and 10 mA cm−2 at 27 mV in 1 M KOH. Furthermore, these results are superior to those of commercial Pt/C. DFT calculations revealed that electrons were transferred from the IrNi alloy core to the graphene shell, and this process became more facile when graphene was decorated with O species, which tuned the electronic structure of the carbon atoms and made them favorable for the formation of C–H bonds, thereby decreasing the ΔGH* for the HER.

掲載誌

Journal of Materials Chemistry A

CiteScore: 19.5

自己引用率: 4.7%

年間論文数: 2211

Journal of Materials Chemistry A, B & C cover high quality studies across all fields of materials chemistry. The journals focus on those theoretical or experimental studies that report new understanding, applications, properties and synthesis of materials. The journals have a strong history of publishing quality reports of interest to interdisciplinary communities and providing an efficient and rigorous service through peer review and publication. The journals are led by an international team of Editors-in-Chief and Associate Editors who are all active researchers in their fields. Journal of Materials Chemistry A, B & C are separated by the intended application of the material studied. Broadly, applications in energy and sustainability are of interest to Journal of Materials Chemistry A, applications in biology and medicine are of interest to Journal of Materials Chemistry B, and applications in optical, magnetic and electronic devices are of interest to Journal of Materials Chemistry C. More than one Journal of Materials Chemistry journal may be suitable for certain fields and researchers are encouraged to submit their paper to the journal that they feel best fits for their particular article. Example topic areas within the scope of Journal of Materials Chemistry A are listed below. This list is neither exhaustive nor exclusive. Artificial photosynthesis Batteries Carbon dioxide conversion Catalysis Fuel cells Gas capture/separation/storage Green/sustainable materials Hydrogen generation Hydrogen storage Photocatalysis Photovoltaics Self-cleaning materials Self-healing materials Sensors Supercapacitors Thermoelectrics Water splitting Water treatment

O species-decorated graphene shell encapsulating iridium–nickel alloy as an efficient electrocatalyst towards hydrogen evolution reaction

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Journal of Materials Chemistry A

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