Boosting the Performance of the Nickel Anode in the Oxygen Evolution Reaction by Simple Electrochemical Activation

Ng, Marcus Tze-Kiat; Takanabe, Kazuhiro

doi:10.1002/ange.201701642

Cited by 22 publications

(17 citation statements)

References 47 publications

(60 reference statements)

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“…In alkaline medium, the proposed catalytic mechanism for the 4-electron transfer OER (4OH – → 2H 2 O + O 2 + 4e – ) can be depicted by the following reaction pathways: where * represents a Ni active site, and OH*, O* and OOH* are reaction intermediates. It was reported that the NiOOH phase, with an average oxidation state of 3.6 under OER potential, can facilitate the formation of OOH* intermediates (rate-determining step in OER) and the final release of O 2 , which consequently enhances the catalytic activity. ,, As 2DNWS displays stronger anodic peak when compared with other architectures, it is expected to provide more active sites and exhibit higher activity toward OER catalysis.…”

Section: Results and Discussionmentioning

confidence: 99%

Manipulating the Architecture of Atomically Thin Transition Metal (Hydr)oxides for Enhanced Oxygen Evolution Catalysis

Dou

Zhang

et al. 2018

ACS Nano

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Graphene-like nanomaterials have received tremendous research interest due to their atomic thickness and fascinating properties. Previous studies mainly focus on the modulation of their electronic structures, which undoubtedly optimizes the electronic properties, but is not the only determinant of performance in practical applications. Herein, we propose a generalized strategy to incrementally manipulate the architectures of several atomically thin transition metal (hydr)oxides, and study their effects on catalytic water oxidation. The results demonstrate the obvious superiority of a wrinkled nanosheet architecture in both catalytic activity and durability. For instance, wrinkled Ni(OH) nanosheets display a low overpotential of 358.2 mV at 10 mA cm, a high current density of 187.2 mA cm at 500 mV, a small Tafel slope of 54.4 mV dec, and excellent long-term durability with gradually optimized performance, significantly outperforming other nanosheet architectures and previously reported catalysts. The outstanding catalytic performance is mainly attributable to the 3D porous network structure constructed by wrinkled nanosheets, which not only provides sufficient contact between electrode materials and current collector, but also offers highly accessible channels for facile electrolyte diffusion and efficient O escape. Our study provides a perspective on improving the performance of graphene-like nanomaterials in a wide range of practical applications.

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Section: Results and Discussionmentioning

confidence: 99%

Manipulating the Architecture of Atomically Thin Transition Metal (Hydr)oxides for Enhanced Oxygen Evolution Catalysis

Dou

Zhang

et al. 2018

ACS Nano

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“…3f and Supplementary Fig. 19 , also see Methods for details) 54 , 55 . To completely capture the potential-dependent evolution of E app , the analysis was performed both below and above the catalytic onset potential.…”

Section: Resultsmentioning

confidence: 99%

Modifying redox properties and local bonding of Co3O4 by CeO2 enhances oxygen evolution catalysis in acid

et al. 2021

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Developing efficient and stable earth-abundant electrocatalysts for acidic oxygen evolution reaction is the bottleneck for water splitting using proton exchange membrane electrolyzers. Here, we show that nanocrystalline CeO2 in a Co3O4/CeO2 nanocomposite can modify the redox properties of Co3O4 and enhances its intrinsic oxygen evolution reaction activity, and combine electrochemical and structural characterizations including kinetic isotope effect, pH- and temperature-dependence, in situ Raman and ex situ X-ray absorption spectroscopy analyses to understand the origin. The local bonding environment of Co3O4 can be modified after the introduction of nanocrystalline CeO2, which allows the CoIII species to be easily oxidized into catalytically active CoIV species, bypassing the potential-determining surface reconstruction process. Co3O4/CeO2 displays a comparable stability to Co3O4 thus breaks the activity/stability tradeoff. This work not only establishes an efficient earth-abundant catalysts for acidic oxygen evolution reaction, but also provides strategies for designing more active catalysts for other reactions.

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“…This oxidation from β-Ni(OH) 2 to β-NiOOH is often concurrent with a rearrangement into layered, sheet-like structures. − This electrochemical oxidation of Ni induces a structural rearrangement that can allow for the intercalation of water molecules and possibly ionic impurities such as carbonate species. , Activated Ni electrodes with a stable β-NiOOH phase have shown improved efficiency for several electrochemical processes, such as the OER, the hydrogen evolution reaction (HER), and the hydrogen oxidation reaction (HOR). ,− The kinetics of the HOR and the HER have been studied experimentally using Ni hydroxide species . The presence of oxide species on the surfaces of the Ni electrodes during the HOR and the HER was found to decrease adsorption energies of the hydrogen atoms, which resulted in reduced activation energies and faster reaction kinetics. , Other reports have demonstrated the preparation of activated Ni-based electrocatalysts by the inclusion of alkali-metal cations (e.g., K, Cs) . In this prior example, the authors reported the preparation of a relatively thick layer containing a NiOOH phase, which formed a three-dimensional (3D) network with nanoscale features and intercalated cations through cycling the applied potential under conditions of a mild pH and a high temperature.…”

Section: Introductionmentioning

confidence: 99%

Influence of Electrochemical Aging on Bead-Blasted Nickel Electrodes for the Oxygen Evolution Reaction

Taylor

Pauls

Paul

et al. 2019

ACS Appl. Energy Mater.

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The oxygen evolution reaction (OER) is of importance to both electrochemical energy conversion and energy storage. Low-cost, non-precious metal electrocatalysts that can withstand high operational current densities will likely be the best candidates for meeting the commercial needs for a range of OER applications. In addition to electrode composition, the surface morphology of gas evolving electrodes can affect their efficiency and performance. In this work, we demonstrate the influence of electrochemical aging on the performance of micro-and nanoscale textures for the OER. A series of textured Ni electrodes were prepared by rapid, scalable techniques, which included the use of bead-blasting. Two distinct approaches to induce the formation of the active Ni (oxy)hydroxide phase were conducted by electrochemical aging using cyclic voltammetry (CV) methods. The influence of the aging technique was assessed and correlated to the performance of these surface textures. Differences in the morphology of these textures and their resulting surface areas were estimated using three-dimensional (3D) reconstructions obtained from electron microscopy analyses. Focused ion beam (FIB) milling was also performed on the bead-blasted electrodes to visualize buried cracks and voids. The potential required for the OER at an applied current density of 500 mA/cm 2 exhibited a reduction of 0.7 V for the electrodes aged by the steady-state treatment. The OER performance of the textured electrodes were found to correlate to both the electrode surface morphology and the type of electrochemical aging applied to the electrodes.

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Boosting the Performance of the Nickel Anode in the Oxygen Evolution Reaction by Simple Electrochemical Activation

Abstract: Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: http://dx.

Cited by 22 publications

References 47 publications

Manipulating the Architecture of Atomically Thin Transition Metal (Hydr)oxides for Enhanced Oxygen Evolution Catalysis

Manipulating the Architecture of Atomically Thin Transition Metal (Hydr)oxides for Enhanced Oxygen Evolution Catalysis

Modifying redox properties and local bonding of Co3O4 by CeO2 enhances oxygen evolution catalysis in acid

Influence of Electrochemical Aging on Bead-Blasted Nickel Electrodes for the Oxygen Evolution Reaction

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