Effect of V substitution at B-site on the physicochemical and electrocatalytic properties of spinel-type NiFe2O4 towards O2 evolution in alkaline solutions

Anindita,; Singh, A.; Singh, R.N.

doi:10.1016/j.ijhydene.2010.02.003

Cited by 42 publications

(16 citation statements)

References 36 publications

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“…In addition it is known that β-NiOOH can be converted to the gamma phase by so-called overcharge at extreme anodic potentials [12] , suggesting that indeed γ-NiOOH constitutes the catalytically active centre on pure Ni under harsh oxidative conditions in an alkaline medium. This interpretation is also consistent with the outcome of polarization experiments performed with Ni metal done by Lyons et al [12] , and with the recent density functional theory calculations (DFT) by Rossmeisl et al [ 55 , 56 ] [57,58,59,60] . As a short distance phenomenon it can only occur between ions within close neighbour sphere.…”

Section: The Catalytic Active Speciessupporting

confidence: 92%

Stainless steel made to rust: a robust water-splitting catalyst with benchmark characteristics

Schäfer

Sadaf

Walder

et al. 2015

Energy Environ. Sci.

188

207

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The oxygen evolution reaction (OER) is known as the efficiency-limiting step for the electrochemical cleavage of water mainly due to the large overpotentials commonly used materials on the anode side cause. Since Ni-Fe oxides reduce overpotentials occurring in the OER dramatically they are regarded as anode materials of choice for the electrocatalytically driven water-splitting reaction. We herewith show that a straightforward surface modification carried out with AISI 304, a general purpose austenitic stainless steel, very likely, based upon a dissolution mechanism, to result in the formation of an ultra-thin layer consisting of Ni, Fe oxide with a purity > 99%. The Ni enriched thin layer firmly attached to the steel substrate is responsible for the unusual highly efficient anodic conversion of water into oxygen as demonstrated by the low overpotential of 212 mV at 12 mA/cm 2 current density in 1 M KOH, 269.2 mV at 10 mA/cm 2 current density in 0.1 M KOH respectively. The Ni, Fe-oxide layer formed on the steel creates a stable outer sphere, and the surface oxidized steel samples proved to be inert against longer operating times (> 150 ks) in alkaline medium. In addition Faradaic efficiency measurements performed through chronopotentiometry revealed a charge to oxygen

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Section: The Catalytic Active Speciessupporting

confidence: 92%

Stainless steel made to rust: a robust water-splitting catalyst with benchmark characteristics

Schäfer

Sadaf

Walder

et al. 2015

Energy Environ. Sci.

188

207

View full text Add to dashboard Cite

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“…Currently, different alloys, oxides, and hydroxides of Ni and Fe are thought to be promising OER electrocatalysts as a result of their intrinsically high activity and corrosion‐resistant nature . Highly crystalline NiFe oxides can be formed through the high‐temperature annealing of NiFe alloy, in which the ratio of the two metals and the multivalence state of the metals (Ni 2+ /Ni 3+ and Fe 2+ /Fe 3+ ) in NiFe 2 O 4 spinel materials are major factors determining OER activity . In addition, NiFe 2 O 4 has also been reported to demonstrate good OER catalytic activity due to factors such as the outstanding OER activity of Ni‐based oxides and the role of Fe in tuning the electronic structure of NiO x compounds.…”

Section: Advancements Of Tm‐based Electrocatalystsmentioning

confidence: 99%

A review of transition metal‐based bifunctional oxygen electrocatalysts

Ibrahim

Tsai

Chala

et al. 2019

J Chinese Chemical Soc

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Electrochemical energy storage and conversion devices play a key role in the development of clean, sustainable, and efficient energy systems to meet the sustainable growth of our society. However, challenging issues including the sluggish kinetics of oxygen electrode reactions involving the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) are present, limiting the implementation of devices such as metal‐air batteries, water electrolyzers, and regenerative fuel cells. In this review, various monometallic and bimetallic transition metal oxides (TMOs) and hydroxides are summarized in terms of their application for ORR/OER, in which the merits and demerits of various precious metal and carbon‐based metal oxide materials are discussed, with requirements for better electrocatalysts and catalyst support being introduced as well. Following this, different approaches to improve catalytic activity such as the introduction of doping and defects, the manipulation of crystal facets, and the engineering of supports, compositions, and morphologies are summarized in which TMOs with improved ORR/OER catalytic activities can be synthesized, further improving the speed, stability, and polarization of electrochemical energy storage and conversion devices. Finally, perspectives into the improvement of performance and the better understanding of ORR/OER mechanisms for bifunctional electrocatalysts using in situ spectroscopic techniques and density functional theory calculations are also discussed.

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“…The observed decrease of the diameter of the semicircle with increase of the applied potential ( Fig. 4) clearly indicates that the semicircle is produced due to the OER taking place at the electrodeeelectrolyte interface [17,30,49]. The diameter of the semicircle, in fact, represents the charge transfer resistance (R ct ) which is inversely related to the rate of the electrode reaction and so, a decrease in the R ct means an increase in the rate of the OER.…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 92%

“…Also, the apparent electrocatalytic activities of Cr 2Àx Fe x (-MoO 4 ) 3 electrodes are better than those of many active Co-and Fe-based spinel oxide [9,30] The electrocatalytic activities of active ternary CreFeeMoeO oxides were, however, lower compared to those of NiFeCrO 4 ( j ap ¼ 100 mA cm À2 , E ¼ 0.586 V vs. Hg/HgO) prepared by precipitation [26], La-doped Co 3 O 4 ( j ap ¼ 100 mA cm À2 , E ¼ 0.527e0.539 V vs. Hg/HgO) obtained by microwave assisted thermal decomposition [11], ZnCo 2 O 4 ( j ap ¼ 100 mA cm À2 , h ¼ 0.256e0.203 V) obtained by electrophoretic deposition [21], and electrodeposited Co þ Ni mixed oxide catalyst ( j ap ¼ 100 mA cm À2 , E ¼ 0.60 V vs. Hg/ HgO) [17].…”

Section: Electrode Kinetic Studymentioning

confidence: 99%