Single-crystalline (FexNi1-x)2P nanosheets with dominant {0111} facets: Efficient electrocatalysts for hydrogen evolution reaction at all pH values

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Author(s)
Zhang, Wei
Zou, Yihui
Liu, Hongli
Chen, Shuai
Wang, Xin
Zhang, Huawei
She, Xilin
Yang, Dongjiang
Year published
2019
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Electrocatalytic hydrogen evolution reaction (HER) plays a critical role in developing hydrogen and fuel cell technologies. At present, only platinum (Pt) and its compounds are thought to be efficient electrocatalysts for HER, particularly at all-pH values. However, the scarcity and high cost of Pt-based catalysts have seriously hindered their practical application in HER. Here, we report a two-step method for synthesizing single-crystalline (FexNi1-x)2P nanosheets with exposed {0111} facets on Ni foam. Compared with pristine Ni2P, the (FexNi1-x)2P nanosheets exhibit a dramatically improved HER activity (an overpotential of ...
View more >Electrocatalytic hydrogen evolution reaction (HER) plays a critical role in developing hydrogen and fuel cell technologies. At present, only platinum (Pt) and its compounds are thought to be efficient electrocatalysts for HER, particularly at all-pH values. However, the scarcity and high cost of Pt-based catalysts have seriously hindered their practical application in HER. Here, we report a two-step method for synthesizing single-crystalline (FexNi1-x)2P nanosheets with exposed {0111} facets on Ni foam. Compared with pristine Ni2P, the (FexNi1-x)2P nanosheets exhibit a dramatically improved HER activity (an overpotential of 81, 90, 103 mV at 10 mA cm−2 in acidic, neutral and alkaline media, respectively). Based on the density functional theory (DFT) calculations, it is observed that trace Fe-doping can lead to more charge accumulation around P active sites, which accordingly decreases the ΔGH* and ΔGH2O and promotes the catalytic activity.
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View more >Electrocatalytic hydrogen evolution reaction (HER) plays a critical role in developing hydrogen and fuel cell technologies. At present, only platinum (Pt) and its compounds are thought to be efficient electrocatalysts for HER, particularly at all-pH values. However, the scarcity and high cost of Pt-based catalysts have seriously hindered their practical application in HER. Here, we report a two-step method for synthesizing single-crystalline (FexNi1-x)2P nanosheets with exposed {0111} facets on Ni foam. Compared with pristine Ni2P, the (FexNi1-x)2P nanosheets exhibit a dramatically improved HER activity (an overpotential of 81, 90, 103 mV at 10 mA cm−2 in acidic, neutral and alkaline media, respectively). Based on the density functional theory (DFT) calculations, it is observed that trace Fe-doping can lead to more charge accumulation around P active sites, which accordingly decreases the ΔGH* and ΔGH2O and promotes the catalytic activity.
View less >
Journal Title
Nano Energy
Volume
56
Copyright Statement
© 2019 Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence (http://creativecommons.org/licenses/by-nc-nd/4.0/) which permits unrestricted, non-commercial use, distribution and reproduction in any medium, providing that the work is properly cited.
Subject
Macromolecular and Materials Chemistry
Materials Engineering
Nanotechnology
Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Nanoscience & Nanotechnology