Tuning the oxygen evolution reaction on a nickel–iron alloy <i>via</i> active straining

Wang, Anqi; Zhao, Zhonglong; Hu, Di; Niu, Junfeng; Zhang, Man; Yan, Kai; Lü, Gang

doi:10.1039/c8nr08879a

Cited by 53 publications

(33 citation statements)

References 34 publications

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“…The X‐ray photoelectron spectroscopy (XPS) spectra collected on the as‐prepared electrode reveals that the characteristic peaks of Ni 2p binding energy are consistent with those in previously reported NiOOH in the literature, confirming the formation of the NiOOH cocatalyst (Figure S6, Supporting Information) . Many investigations suggest that the Volmer reaction might be the rate‐determining step for OER on the NiOOH and the Ni sites could be the active centers . In addition, the high activity of the NiOOH might be further boosted by adding Fe impurities in solution, forming Ni(Fe)OOH as the catalysts .…”

Section: Resultssupporting

confidence: 83%

Multifunctional Nickel Film Protected n‐Type Silicon Photoanode with High Photovoltage for Efficient and Stable Oxygen Evolution Reaction

Luo

Liu

et al. 2019

Small Methods

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n‐type silicon (n‐Si) is a promising photoanode candidate for photoelectrochemical (PEC) water splitting. However, severe chemical corrosion, sluggish reaction kinetics as well as extremely low photovoltage are critical limitations hampering its PEC performance. This paper describes the introduction of a metallic nickel (Ni) thin film as a multifunctional layer that 1) forms a Schottky junction to extract a high photovoltage, 2) provides an electrocatalytic surface for oxygen evolution reaction (OER), and 3) protects Si against corrosion. Upon introducing a high‐quality Al2O3 tunneling layer to optimize the Si/Ni interface and loading nickel oxide hydroxide to further accelerate the OER, this metal–insulator–semiconductor junction photoanode achieves a record high photovoltage of 640 mV and energy conversion efficiency of 3% in n‐Si based photoanodes without np or np+ buried homojunction, yielding an air mass 1.5G photocurrent density of ≈28 mA cm−2 at 1.23 V (vs reversible hydrogen electrode) for oxygen evolution in alkaline solution with a stability of more than 80 h.

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Section: Resultssupporting

confidence: 83%

Multifunctional Nickel Film Protected n‐Type Silicon Photoanode with High Photovoltage for Efficient and Stable Oxygen Evolution Reaction

Luo

Liu

et al. 2019

Small Methods

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“…Application of mechanical, thermal or electrical loading result in bending, compression or expansion of an elastic substrate, further inducing stress-strain response on the deposited material. Such catalyst engineering through dynamic strain has been shown for: i ) HER on MoS 2 , Au, Pt, Ni, Cu, WC 16–19 and ii ) OER on NiO x 22 , nickel-iron alloys 32 . The primarily focus of the previous studies was effects of strain on the catalytic activities of transition metals and the experimental results were consistent with d-band theory, described in the seminal work by Mavrikakis et al .…”

Section: Introductionmentioning

confidence: 99%

Dynamic Tuning of a Thin Film Electrocatalyst by Tensile Strain

Benson

Gregg

et al. 2019

Sci Rep

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We report the ability to tune the catalytic activities for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) by applying mechanical stress on a highly n-type doped rutile TiO2 films. We demonstrate through operando electrochemical experiments that the low HER activity of TiO2 can reversibly approach those of the state-of-the-art non-precious metal catalysts when the TiO2 is under tensile strain. At 3% tensile strain, the HER overpotential required to generate a current density of 1 mA/cm2 shifts anodically by 260 mV to give an onset potential of 125 mV, representing a drastic reduction in the kinetic overpotential. A similar albeit smaller cathodic shift in the OER overpotential is observed when tensile strain is applied to TiO2. Results suggest that significant improvements in HER and OER activities with tensile strain are due to an increase in concentration of surface active sites and a decrease in kinetic and thermodynamics barriers along the reaction pathway(s). Our results highlight that strain applied to TiO2 by precisely controlled and incrementally increasing (i.e. dynamic) tensile stress is an effective tool for dynamically tuning the electrocatalytic properties of HER and OER electrocatalysts relative to their activities under static conditions.

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“…HS-LEIS analysis was conducted to characterize the atomic species and their content on the outmost surface of Ru/Ni, and the results are shown in Figure 11. Meanwhile, we provide the 3 keV 4 He + and 5 keV 20 Ne + HS-LEIS spectra of the Ru/Ni catalysts because 4 He + ions can detect all the elements but with low sensitivity for heavier elements and 20 Ne + ions only have response to heaver elements. [44] In both 3 keV 4 He + HS-LEIS spectra and 5 keV 20 Ne + HS-LEIS spectra of the Ru/Ni samples, we found that the intensity of ruthenium atoms signal was proportionable, but that of nickel atoms signal was in the order of Ru/Ni-No > Ru/Ni-CTAB > Ru/Ni-PVP.…”

Section: Hs-leis Testing Results Of Ru/nimentioning

confidence: 99%

“…PHI Quantum 2000 Scanning ESCA Microprobe was used to probe the chemical state of Ni and Ru and surficial compositions of different species (XPS), with monochromatic Al Ka (1486.6 eV) for excitation. 4 He + and 20 Ne + HS-LEIS spectra of the as-prepared catalysts were recorded on IonTOF Qtac100 low-energy ion scattering analyzer with the scattering angle of 145°, the kinetic energy of 4 He + ions was 3 keV and ion flux was 1325 pA cm À 2 , the kinetic energy of 20 Ne + ions was 5 keV and ion flux was 1600 pA cm À 2 . TEM (HRTEM) analysis was performed by using transmission electron microscopy (FEI TECNAI F20) with operating voltage of 200 kV.…”

Section: Sample Characterizationmentioning

confidence: 99%

“…At present, nickel and nickel‐based alloy materials are mainly prepared by chemical and physical means. But chemical approaches were more widely adopted than physical ones, including sol‐gel method, chemical reduction method, hydrothermal synthesis method and template synthesis method, etc . The following section mainly discusses the chemical methods of preparing nickel crystals.…”

Section: Introductionmentioning

confidence: 99%

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Room‐Temperature Morphology‐Controlled Synthesis of Nickel and Catalytic Properties of Corresponding Ru/Ni Catalysts

et al. 2019

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Differently shaped nickel crystals were obtained at ambient temperature via simple liquid chemical reduction by adding different surfactants (such as polyvinylpyrrolidone (PVP) or cetyltrimethylammonium bromide (CTAB)), with hydrazine hydrate as reducing agent and ethanol as solvent. Nickel nanoparticles (NPs), thorny nickel nanowires or rose‐like nickel crystals were obtained in the synthesis process without any surfactant, with PVP or with CTAB, respectively. The corresponding ruthenium‐on‐Ni crystal supported catalysts (Ru/Ni) were synthesized through galvanic replacement. Their catalytic behavior was tested in the model reaction of the hydrogenation of benzene. The order of their catalytic activity was Ru/thorny Ni nanowire > Ru/rose‐like Ni > Ru/Ni NPs due to different shapes and structures of Ru/Ni. The Ru/thorny Ni nanowires catalyst also exhibited outstanding stability for benzene hydrogenation to cyclohexane. The as‐obtained Ni and Ru/Ni samples were characterized by X‐ray diffraction (XRD), scanning electronic microscopy (SEM), SEM energy dispersive X‐ray spectroscopy (SEM‐EDS), high‐sensitivity low‐energy ion scattering spectroscopy (HS‐LEIS), X‐ray photoelectron spectroscopy (XPS), SEM‐EDS elemental mapping, transmission electron micro‐scope (TEM), and high resolution TEM (HRTEM), to reveal their morphologies, structures and element distribution and further illustrate the intrinsic reasons for their different performance in catalyzing benzene hydrogenation.

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Tuning the oxygen evolution reaction on a nickel–iron alloy via active straining

Abstract: We report that one can gain active control of the electrocatalytic oxygen evolution reaction (OER) on Ni3Fe thin films via externally applied strains.

Cited by 53 publications

References 34 publications

Multifunctional Nickel Film Protected n‐Type Silicon Photoanode with High Photovoltage for Efficient and Stable Oxygen Evolution Reaction

Multifunctional Nickel Film Protected n‐Type Silicon Photoanode with High Photovoltage for Efficient and Stable Oxygen Evolution Reaction

Dynamic Tuning of a Thin Film Electrocatalyst by Tensile Strain

Room‐Temperature Morphology‐Controlled Synthesis of Nickel and Catalytic Properties of Corresponding Ru/Ni Catalysts

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