Electro-catalytic hydrogen evolution and magnetic behavior of N-doped-rGO supported Ni x P y

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Electro‑catalytic hydrogen evolution and magnetic behavior of N‑doped‑rGO supported ­NixPy Arnab Pal1 · Kalyanashis De2 · Ramaprasad Maiti3 · Subal Chandra Manna4 · Kuntal Chatterjee1  Received: 7 February 2020 / Accepted: 15 April 2020 / Published online: 30 April 2020 © Springer Nature Switzerland AG 2020

Abstract Search for cost effective, earth abundant electrocatalysts for hydrogen generation through water splitting is the challenge of the hour whereas multifunctional applicability of the materials is the extremely sought issue for multi-tasking smart materials. In this work, nitrogen doped reduced graphene oxide (N-rGO) supported nickel phosphide ­(NixPy) nanomaterial has been prepared and characterized. Details electrocatalytic measurements exhibit the commendable performance of the composite materials against hydrogen evolution reaction in acid medium. The reduction of the required overpotential for reaching 10 mA/cm2 from 265 mV ­(NixPy) to 248 mV ­(NixPy/N-rGO) is observed in 0.5 M ­H2SO4 solution which proves the benefit for attaching N-rGO with ­NixPy. The electrochemical active surface area measurement also ascertains the quality of the composite and the enhancement of an active surface area is attributed to the attachment of N-rGO matrix. Furthermore, the ­NixPy/N-rGO composite confirms it’s stability in the acidic medium for 1200 min at 248 mV without any significant loss of current. Ground state ferromagnetic behavior has been demonstrated by N ­ ixPy/N-rGO in sharp contrast to the paramagnetic behavior exhibited by the bare N ­ ixPy nanoclusters at low temperature. Thus, the N-rGO matrix supported N ­ ixPy manifests both electrocatalytic proficiency and magnetic ordering with potential application in the future green energy as well as in data storage technologies. Graphic abstract 

Keywords  N-rGO supported ­NixPy · Electrocatalytic HER · Magnetic property Electronic supplementary material  The online version of this article (https​://doi.org/10.1007/s4245​2-020-2780-6) contains supplementary material, which is available to authorized users. *  Kuntal Chatterjee, [email protected] | 1Department of Physics, Vidyasagar University, Midnapore 721 102, India. 2Department of Physics, Neotia Institute of Technology Management and Science, Kolkata 700 046, India. 3Department of Electronics, Derozio Memorial College, Rajarhat Road, Kolkata 700 136, India. 4Department of Chemistry and Chemical Technology, Vidyasagar University, Midnapore 721 102, India. SN Applied Sciences (2020) 2:993 | https://doi.org/10.1007/s42452-020-2780-6

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Research Article

SN Applied Sciences (2020) 2:993 | https://doi.org/10.1007/s42452-020-2780-6

1 Introduction Present world witnessed a towering demand for clean energy techniques due to the constantly shrinking fossil fuel sources and ecological hazards caused by their burning [1–4]. Hydrogen has the potential to serve as an efficient agent for clean energy sources due to its super high calorific value [5]. Electrochemical reduction of water is co