DataVXACS Energy LettersPaper
journal article·2018-07-13

Graphene Layer Encapsulation of Non-Noble Metal Nanoparticles as Acid-Stable Hydrogen Evolution Catalysts

Kailong Hu, Tatsuhiko Ohto, Linghan Chen, Jiuhui Han, Mitsuru Wakisaka, Yuki Nagata, Jun-ichi Fujita, Yoshikazu Ito

ACS Energy Letters· Volume 3· Issue 7
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Source abstract

Abstract

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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Research context

Energy storageNanomaterialsCatalysis & surfaces

OpenAlex topics: Electrocatalysts for Energy Conversion · Advanced battery technologies research · Fuel Cells and Related Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Institute of Applied Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8573, Japan

Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka 560-8531, Japan

Department of Materials Science, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan

Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

Graduate School of Engineering, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama 939-0398, Japan

PRESTO, Japan Science and Technology Agency, Saitama 332-0012, Japan

Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany

Funding

University of Tsukuba · Ministry of Education, Culture, Sports, Science and Technology · Kato Foundation for Promotion of Science · Precursory Research for Embryonic Science and Technology · Japan Society for the Promotion of Science · TEPCO Memorial Foundation

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