journal article·2021-07-28

Synergistic Electrocatalytic Hydrogen Evolution in Ni/NiS Nanoparticles Wrapped in Multi-Heteroatom-Doped Reduced Graphene Oxide Nanosheets

Mohamed Barakat Zakaria Hegazy, Mohamed Reda Berber, Yusuke Yamauchi, Amir Pakdel, Rui Cao, Ulf-Peter Apfel

ACS Applied Materials & Interfaces· Volume 13· Issue 29
Publisher page

Abstract

Hydrogen production is a key driver for sustainable and clean fuels used to generate electricity, which can be achieved through electrochemical splitting of water in alkaline solutions. However, the hydrogen evolution reaction (HER) is kinetically sluggish in alkaline media. Therefore, it has become imperative to develop inexpensive and highly efficient electrocatalysts that can replace the existing expensive and scarce noble-metal-based catalysts. Herein, we report on the rational design of nonprecious heterostructured electrocatalysts comprising a highly conductive face-centered cubic nickel metal, a nickel sulfide (NiS) phase, and a reduced graphene oxide (rGO) doped with phosphorous (P), sulfur (S), and nitrogen (N) in one ordered heteromaterial named Ni/NiS/P,N,S–rGO. The Ni/NiS/P,N,S–rGO electrode shows the best performance toward HER in 1.0 M KOH media among all materials tested with an overpotential of 155 mV at 10.0 mA cm–2 and a Tafel slope of 135 mV dec–1. The performance is comparable to the herein used Pt/C-20% benchmark catalyst examined under the same experimental conditions. The chronoamperometry and chronopotentiometry measurements have reflected the high durability of the Ni/NiS/P,N,S–rGO electrode for technological applications. At the same time, the current catalyst showed a high robustness and structure retention after long-term HER performance, which is reflected by SEM, XRD, and XPS measurements.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Electrocatalysts for Energy Conversion · Advanced Photocatalysis Techniques · Advanced battery technologies research

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

Affiliations

Inorganic Chemistry I, Faculty for Chemistry and Biochemistry, Ruhr University Bochum, 44801 Bochum, Germany

Fraunhofer Institute for Environmental, Safety and Energy Technology UMSICHT, 46047 Oberhausen, Germany

Department of Chemistry, Faculty of Science, Tanta University, 31527 Tanta, Egypt

Chemistry Department, College of Science, Jouf University, Sakaka 2014, Saudi Arabia

JST-ERATO Yamauchi Materials Space-Tectonics Project and International Research Center for Materials Nanoarchitechtonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan

School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, Queensland 4072, Australia

Department of Mechanical, Manufacturing & Biomedical Engineering, Trinity College Dublin, Dublin D02PN40, Ireland

Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi’an 710119, China

Funding

Science Foundation Ireland · Deutsche Forschungsgemeinschaft · Fraunhofer-Gesellschaft · Alexander von Humboldt-Stiftung · Ministry of Education - Kingdom of Saudi Arabi

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