Spectroscopic Characterization of Mixed Fe–Ni Oxide Electrocatalysts for the Oxygen Evolution Reaction in Alkaline Electrolytes

Landon, James; Demeter, Ethan L.; İnoğlu, Nilay; Keturakis, Christopher J.; Wachs, Israel E.; Vasić, Relja; Frenkel, Anatoly I.; Kitchin, John R.

doi:10.1021/cs3002644

Cited by 434 publications

(372 citation statements)

References 51 publications

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“…Mixed transition metal oxides usually show superior OER activity compared to either of the parent metal oxides. It was reported that Ni doping in Co oxides could lead to the creation of new active sites with lower activation energy 32,33 , and Fe dopants were found to enhance the OER activities of Ni hydroxides or oxides 11,[34][35][36][37] . Recently, an excellent OER performance was observed on amorphous NiCoFe oxides, which were prepared by a photochemical route 38,39 .…”

Section: Resultsmentioning

confidence: 99%

Electrochemical tuning of layered lithium transition metal oxides for improvement of oxygen evolution reaction

et al. 2014

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Searching for low-cost and efficient catalysts for the oxygen evolution reaction has been actively pursued owing to its importance in clean energy generation and storage. While developing new catalysts is important, tuning the electronic structure of existing catalysts over a wide electrochemical potential range can also offer a new direction. Here we demonstrate a method for electrochemical lithium tuning of catalytic materials in organic electrolyte for subsequent enhancement of the catalytic activity in aqueous solution. By continuously extracting lithium ions out of LiCoO 2 , a popular cathode material in lithium ion batteries, to Li 0.5 CoO 2 in organic electrolyte, the catalytic activity is significantly improved. This enhancement is ascribed to the unique electronic structure after the delithiation process. The general efficacy of this methodology is demonstrated in several mixed metal oxides with similar improvements. The electrochemically delithiated LiCo 0.33 Ni 0.33 Fe 0.33 O 2 exhibits a notable performance, better than the benchmark iridium/carbon catalyst.

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Section: Resultsmentioning

confidence: 99%

Electrochemical tuning of layered lithium transition metal oxides for improvement of oxygen evolution reaction

et al. 2014

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“…However, some powerful surface observation techniques, such as XPS, cannot be adapted to electrochemical reactions because of the presence of the electrolytes. A few spectroscopic techniques, such as infrared spectroscopy (IR) [108], Raman spectroscopy [109,110], and extened X-ray absorption fine structure spectroscopy (EXAFS) [111] have been used to evaluate electrochemical reactions. Recently, in situ grazing incident X ray diffraction (GIXRD) has also been utilized to monitor phase transitions during electrochemical processes [112].…”

Section: Discussionmentioning

confidence: 99%

Electrocatalysts for hydrogen oxidation and evolution reactions

Zhuang

2016

Sci. China Mater.

148

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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. [69] The combined DEMS and XAS analyses distinguished the injection charge depending on the reactions for which it was consumed, namely the oxidation of transition metals or water molecules, as shown in Figure 3d.…”

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

655

487

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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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Spectroscopic Characterization of Mixed Fe–Ni Oxide Electrocatalysts for the Oxygen Evolution Reaction in Alkaline Electrolytes

Cited by 434 publications

References 51 publications

Electrochemical tuning of layered lithium transition metal oxides for improvement of oxygen evolution reaction

Electrochemical tuning of layered lithium transition metal oxides for improvement of oxygen evolution reaction

Electrocatalysts for hydrogen oxidation and evolution reactions

Recent Progress on Multimetal Oxide Catalysts for the Oxygen Evolution Reaction

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