TY - JOUR
T1 - Graphene Layer Encapsulation of Non-Noble Metal Nanoparticles as Acid-Stable Hydrogen Evolution Catalysts
AU - Hu, Kailong
AU - Ohto, Tatsuhiko
AU - Chen, Linghan
AU - Han, Jiuhui
AU - Wakisaka, Mitsuru
AU - Nagata, Yuki
AU - Fujita, Jun Ichi
AU - Ito, Yoshikazu
N1 - Funding Information:
We thank Ms. Kazuyo Omura of the Institute for Material Research (Tohoku University) for her help with the XPS measurements. This work was funded by JST-PRESTO “Creation of Innovative Core Technology for Manufacture and Use of Energy Carriers from Renewable Energy” (JPMJPR1541, JPMJPR1444); JSPS KAKENHI (Grant Nos. JP15H05473, JP23246063, JP15H02195, JP16K17855); JSPS Grant-in-Aid for Scientific Research on Innovative Areas “Discrete Geometric Analysis for Materials Design” (Grant Number JP18H04477); World Premier International Research Center Initiative (WPI), MEXT, Japan; NIMS microstructural characterization platform as a program of the “Nanotechnology Platform” of MEXT, Japan; University of Tsukuba Basic Research Support Program Type S, the Open Facility, Research Facility Center for Science and Technology, University of Tsukuba; and the TEPCO Memorial Foundation. DFT calculations were performed through the use of OCTOPUS at the Cybermedia Center, Osaka University. K.L.H. acknowledges a Japanese government (MONBUKAGAKUSHO: MEXT) scholarship and the Kato Foundation for Promotion of Science (KS-3032).
Publisher Copyright:
© Copyright 2018 American Chemical Society.
PY - 2018/7/13
Y1 - 2018/7/13
N2 - Acid-stable, non-noble catalysts are promising for hydrogen evolution reaction (HER); however, they get easily damaged when used in acidic electrolytes, thus reducing the HER lifetimes. Moreover, completely blocking catalysts from acidic electrolytes degrades HER performance. To achieve a balance between the HER lifetime and performance, we vary the number of N-doped graphene layers (1-2, 2-3, and 3-5 layers) encapsulating NiMo nanoparticles as efficient HER catalysts and obtain the optimal number of protective layers. Our data show that 3-5 graphene layers achieved the best balance, with a stable current density of 100 mA cm-2 for 25 h in 0.5 M H2SO4. Density functional theory calculations are performed to show the effect of encapsulating graphene layer number on the catalytic activity and protection of non-noble NiMo in acidic electrolytes.
AB - Acid-stable, non-noble catalysts are promising for hydrogen evolution reaction (HER); however, they get easily damaged when used in acidic electrolytes, thus reducing the HER lifetimes. Moreover, completely blocking catalysts from acidic electrolytes degrades HER performance. To achieve a balance between the HER lifetime and performance, we vary the number of N-doped graphene layers (1-2, 2-3, and 3-5 layers) encapsulating NiMo nanoparticles as efficient HER catalysts and obtain the optimal number of protective layers. Our data show that 3-5 graphene layers achieved the best balance, with a stable current density of 100 mA cm-2 for 25 h in 0.5 M H2SO4. Density functional theory calculations are performed to show the effect of encapsulating graphene layer number on the catalytic activity and protection of non-noble NiMo in acidic electrolytes.
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U2 - 10.1021/acsenergylett.8b00739
DO - 10.1021/acsenergylett.8b00739
M3 - Article
AN - SCOPUS:85048368898
SN - 2380-8195
VL - 3
SP - 1539
EP - 1544
JO - ACS Energy Letters
JF - ACS Energy Letters
IS - 7
ER -
