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      Atomic layer deposition of NiOOH/Ni(OH) 2 on PIM-1-based N-Doped carbon nanofibers for electrochemical water splitting in alkaline medium

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      Author(s)
      Patil, Bhushan
      Satılmış, Bekir
      Khalily, Mohammad Aref
      Uyar, Tamer
      Date
      2019
      Source Title
      ChemSusChem
      Print ISSN
      1864-5631
      Publisher
      Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim
      Volume
      12
      Issue
      7
      Pages
      1469 - 1477
      Language
      English
      Type
      Article
      Item Usage Stats
      392
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      510
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      Abstract
      Portable and flexible energy devices demand lightweight and highly efficient catalytic materials for use in energy devices. An efficient water splitting electrocatalyst is considered an ideal future energy source. Well‐aligned high‐surface‐area electrospun polymers of intrinsic microporosity (PIM‐1)‐based nitrogen‐doped carbon nanofibers were prepared as a free‐standing flexible electrode. A non‐noble‐metal catalyst NiOOH/Ni(OH)2 was precisely deposited over flexible free‐standing carbon nanofibers by using atomic layer deposition (ALD). The morphology, high surface area, nitrogen doping, and Ni states synergistically showed a low onset potential (ηHER=−40 and ηOER=290 mV vs. reversible hydrogen electrode), small overpotential at η10 [oxygen evolution reaction (OER)=390.5 mV and hydrogen evolution reaction (HER)=−147 mV], excellent kinetics (Tafel slopes for OER=50 mV dec−1 and HER=41 mV dec−1), and high stability (>16 h) towards water splitting in an alkaline medium (0.1 m KOH). The performance was comparable with that of state‐of‐the‐art noble‐metal catalysts (e.g., Ir/C, Ru/C for OER, and Pt/C for HER). Post‐catalytic characterization with X‐ray photoelectron spectroscopy (XPS) and Raman spectroscopy further proved the durability of the electrode. This study provides insight into the design of 1D‐aligned N‐doped PIM‐1 electrospun carbon nanofibers as a flexible and free‐standing NiOOH/Ni(OH)2 decorated electrode as a highly stable nanocatalyst for water splitting in an alkaline medium.
      Keywords
      Atomic layer deposition
      Carbon fibers
      Electrospinning
      Nickel
      Water splitting
      Permalink
      http://hdl.handle.net/11693/53224
      Published Version (Please cite this version)
      https://doi.org/10.1002/cssc.201802500
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      • Institute of Materials Science and Nanotechnology (UNAM) 2258
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