Electrochemical Study of the Energetics of the Oxygen Evolution Reaction at Nickel Iron (Oxy)Hydroxide Catalysts

Swierk, John R.; Klaus, Shannon; Trotochaud, Lena; Bell, Alexis T.; Tilley, T. Don

doi:10.1021/acs.jpcc.5b05861

Cited by 299 publications

(283 citation statements)

References 63 publications

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“…Along with this activation process, a redox peak at 1.38 V showed up (Figure 4b) indicating that the active species is most likely γ−NiOOH which can be easily converted from β−NiOOH under concentrated alkaline solution. [35,51,55] It is well known that the iron impurity from the bulk solution can greatly enhance the performance of a nickel-based OER catalyst, [15,[56][57][58] however, the redox peak at 1.38 V is in a good agreement with the oxidation of Ni(OH) 2 to NiOOH, [42,51,55] instead of Ni-Fe double hydroxides (E ox ≈ 1.45 V under the identical conditions). [41,42] Moreover, as shown in Figure 3 (after activation), a slight shift toward higher binding energy and an asymmetry of the main peak that could confirm the transition to NiOOH, [59] and no metallic Ni or alloy such as Ni-Fe is detected on these spectra ( Figure S1, Supporting Information).…”

Section: Doi: 101002/aenm201600516mentioning

confidence: 97%

Promoting the Water Oxidation Catalysis by Synergistic Interactions between Ni(OH)₂ and Carbon Nanotubes

Wang

Chen

Daniel

et al. 2016

Advanced Energy Materials

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capsulating the electrocatalysts. [27,[43][44][45][46] Recently, Zhao and coworkers [47] and Dai and co-workers [48,49] anchored Co, Ni-Fe based water splitting catalysts on multiwall carbon nanotubes (MWCNTs), these approaches not only enhanced the charge transportations but also increased the available catalytic sites. Although the obtained materials exhibit excellent activity toward water oxidation, the improvement are not significant compared to the original catalysts. Very recently, Zhao and co-workers [50] reported a metal free catalyst based on oxidized MWCNTs (O-MWCNTs) which shows comparable activities to the transition metal-based catalysts, due to the generated oxygen containing ketone groups on surface. This work inspired us to revisit the inorganic/nanocarbon hybrid materials in pursuit of more advanced OER electrocatalysts.As desired, a surprisingly high active OER catalyst has been obtained by simply anchoring the crystalline β−Ni(OH) 2 onto the O-MWCNTs. Different from previous studies, this is the first time that a hybrid material with low Ni contents exhibits extremely high activities for catalyzing oxygen evolution. [41,46] This work paves the path for designing new earth abundant material based alternatives to replace the benchmarking precious Ir/Ru OER catalysts.In order to densely embed the Nickel hydroxide on the MWCNT S , a two-step synthetic strategy was employed to synthesize the hybrid materials as shown in Figure 1. First, the as purchased MWCNTs were purified and mildly oxidized by a piranha solution followed by hydrothermal treatment according to the literature method. [50] Afterward, the freshly obtained O-MWCNTs were mixed with the hydrolysed Ni 2+ solution to afford the hybrid materials. NH 4 OH was introduced as the precipitating reactant instead of strong alkali solution to obtain a particularly pure nickel hydroxide. [51] To gain insights into how the Ni contents in the hybrid materials affect the efficiency toward catalytic water oxidation, five samples with various Ni contents were prepared following the same synthetic route (see the Supporting Information).To gain insight into the structure, morphologies, and composition of the synthesized materials, powder X-ray diffraction (PXRD), scanning electron microscopy, transmission electron microscopy (TEM), hard X-ray photoelectron spectroscopy measurements (HAXPES) and, thermogravimetry (TG) techniques were used to characterize these materials. The morphology of the O-MWCNTs was determined by TEM, as shown in Figure S2a in the Supporting Information. After the loading of Ni, PXRD, and HAXPES (Figure 2a and Figure 3) show that the obtained catalysts are composed of pure crystalline β-Ni(OH) 2 and O-MWCNTs, moreover, no metal impurities such as Fe and Co were detected ( Figure S1, SupportingThe rapid growth in energy demand, the continuous consumption of fossil fuels and the arising environmental concerns are stimulating significant research interests in developing alternative energy systems. [1] Production of hydrogen from electro...

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Section: Doi: 101002/aenm201600516mentioning

confidence: 97%

Promoting the Water Oxidation Catalysis by Synergistic Interactions between Ni(OH)₂ and Carbon Nanotubes

Wang

Chen

Daniel

et al. 2016

Advanced Energy Materials

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“…[40,66,67,69,[71][72][73][74][75] Among them, X-ray absorption spectroscopy (XAS) has widely been used because it can provide information about the oxidation states and local structure of transition metal ions under OER conditions. [40,69,71,75] Görlin et al performed a kinetic study of Ni-Fe LDH under OER conditions based on quantitative analysis of in situ differential electrochemical mass spectrometry (DEMS) and XAS.…”

Section: Ni-fe Layered Hydroxidementioning

confidence: 99%

Recent Progress on Multimetal Oxide Catalysts for the Oxygen Evolution Reaction

Kim

et al. 2018

Advanced Energy Materials

719

498

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fossil fuels are being widely researched for the development of a sustainable energy system. Among the various candidates for green energy resources, hydrogen energy has been at the center of attention. [1,2] Hydrogen is both inexhaustible and environmentally friendly, because it can be produced from earth-abundant reactants such as water and methane and because no CO 2 or other toxic products are emitted during its conversion into other energy form such as electricity, respectively. Moreover, hydrogen can exhibit significantly larger energy density compared with other energy sources such as gasoline and coal. The most widely used method of hydrogen production today is steam reforming because of its low cost in the process. [3] Nevertheless, the release of carbon monoxide or carbon dioxide as byproducts in the steam reforming process diminishes the environmental merits of hydrogen energy. Thus, as a possible cleaner alternative, an electrolysis method that involves producing hydrogen by electrochemically splitting water has been extensively investigated. Using one of the most abundant resources, water, the production of hydrogen from it yields only oxygen as a byproduct.In the water electrolysis, the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) occur simultaneously, as described by the following equationsIn order for the reaction to proceed, a voltage of 1.23 V is theoretically required between an anode and a cathode. However, an overpotential (represented by the symbol η) should be additionally applied to account for the potential loss resulting from kinetic limitations occurring during the electrochemical reaction. The use of electrocatalysts can lower the overpotential by kinetically facilitating the water-splitting reaction either in HER or OER. Due to the nature of four-electron involving OER, it is generally believed that the OER is much more sluggish than the HER; thus, the development of efficient OER Hydrogen is a promising alternative fuel for efficient energy production and storage, with water splitting considered one of the most clean, environmentally friendly, and sustainable approaches to generate hydrogen. However, to meet industrial demands with electrolysis-generated hydrogen, the development of a low-cost and efficient catalyst for the oxygen evolution reaction (OER) is critical, while conventional catalysts are mostly based on precious metals. Many studies have thus focused on exploring new efficient nonprecious-metal catalytic systems and improving the understandings on the OER mechanism, resulting in the design of catalysts with superior activity compared with that of conventional catalysts. In particular, the use of multimetal rather than single-metal catalysts is demonstrated to yield remarkable performance improvement, as the metal composition in these catalysts can be tailored to modify the intrinsic properties affecting the OER. Herein, recent progress and accomplishments of multimetal catalytic systems, including several important groups of catalysts: layered h...

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“…15,45 The high frequency resistive response, Re, (Figure 4d). 41 This is a reasonable assumption because the applied potential during EIS measurement was relatively high; hence, the Rp and Rs are replaced with a combined charge transfer resistance, Rct.…”

Section: +mentioning

confidence: 99%

Effects of Gold Substrates on the Intrinsic and Extrinsic Activity of High-Loading Nickel-Based Oxyhydroxide Oxygen Evolution Catalysts

et al. 2017

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We systematically investigate the effects of Au substrates on the oxygen evolution activities of cathodically electrodeposited nickel oxyhydroxide (NiOOH), nickel-iron oxyhydroxide (NiFeOOH), and nickel-cerium oxyhydroxide (NiCeOOH) at varying loadings from 0 -2000 nmol of metal/cm 2 . We determine that the geometric current densities, especially at higher loadings, were greatly enhanced on Au substrates: NiCeOOH/Au reached 10 mA/cm 2 at 259 mV overpotential, and NiFeOOH/Au achieved 140 mA/cm 2 at 300 mV overpotential, which were much greater than those of the analogous catalysts on graphitic carbon (GC) substrates. By performing a loading quantification using both inductively coupled plasma optical emission spectrometry and integration of the Ni 2+/3+ redox peak, we show that the enhanced activity is predominantly caused by the stronger physical adhesion of catalysts on Au. Further characterizations using impedance spectroscopy and in situ X-ray absorption spectroscopy revealed that the catalysts on Au exhibited lower film resistances and higher number of electrochemically active metal sites. We attribute this enhanced activity to a more homogeneous electrodeposition on Au, yielding catalyst films with very high geometric current densities on flat 3 substrates. By investigating the mass and site specific activities as a function of loading, we bridge the practical geometric activity to the fundamental intrinsic activity.

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Electrochemical Study of the Energetics of the Oxygen Evolution Reaction at Nickel Iron (Oxy)Hydroxide Catalysts

Cited by 299 publications

References 63 publications

Promoting the Water Oxidation Catalysis by Synergistic Interactions between Ni(OH)₂ and Carbon Nanotubes

Promoting the Water Oxidation Catalysis by Synergistic Interactions between Ni(OH)₂ and Carbon Nanotubes

Recent Progress on Multimetal Oxide Catalysts for the Oxygen Evolution Reaction

Effects of Gold Substrates on the Intrinsic and Extrinsic Activity of High-Loading Nickel-Based Oxyhydroxide Oxygen Evolution Catalysts

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Electrochemical Study of the Energetics of the Oxygen Evolution Reaction at Nickel Iron (Oxy)Hydroxide Catalysts

Cited by 299 publications

References 63 publications

Promoting the Water Oxidation Catalysis by Synergistic Interactions between Ni(OH)2 and Carbon Nanotubes

Promoting the Water Oxidation Catalysis by Synergistic Interactions between Ni(OH)2 and Carbon Nanotubes

Recent Progress on Multimetal Oxide Catalysts for the Oxygen Evolution Reaction

Effects of Gold Substrates on the Intrinsic and Extrinsic Activity of High-Loading Nickel-Based Oxyhydroxide Oxygen Evolution Catalysts

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Promoting the Water Oxidation Catalysis by Synergistic Interactions between Ni(OH)₂ and Carbon Nanotubes

Promoting the Water Oxidation Catalysis by Synergistic Interactions between Ni(OH)₂ and Carbon Nanotubes