IrO2/Nb–TiO2 electrocatalyst for oxygen evolution reaction in acidic medium

Hu, Wei; Chen, Shengli; Xia, Qinghua

doi:10.1016/j.ijhydene.2014.02.114

Cited by 118 publications

(108 citation statements)

References 52 publications

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“…Up to date, several electrocatalysts containing precious metals such as mesoporous Pt nanorods [3], Pt nanoparticles @ carbon [4], RueIr nano-alloy [5], trimetallic PtePdeRu nanodendrites [6], IrO 2 /Nb 0.05 Ti 0.95 O 2 [7], PtAu nanoparticles [8], Ir@Pt nanodendrites [9], and Ag nano-powders [10], have been developed. These electrocatalysts exhibit high ORR and/ or OER activities.…”

Section: Introductionmentioning

confidence: 99%

A Co/metal–organic-framework bifunctional electrocatalyst: The effect of the surface cobalt oxidation state on oxygen evolution/reduction reactions in an alkaline electrolyte

Yin

2015

International Journal of Hydrogen Energy

110

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Section: Introductionmentioning

confidence: 99%

A Co/metal–organic-framework bifunctional electrocatalyst: The effect of the surface cobalt oxidation state on oxygen evolution/reduction reactions in an alkaline electrolyte

Yin

2015

International Journal of Hydrogen Energy

110

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“…11,12,13,14 Thus, in recent years, attention is focused on the preparation of inexpensive and non-noble metal oxide catalysts that could reduce the OER overpotential and improve the electrocatalytic activity. 11,12,13,14 Thus, in recent years, attention is focused on the preparation of inexpensive and non-noble metal oxide catalysts that could reduce the OER overpotential and improve the electrocatalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Engineered Electronic States of Transition Metal Doped TiO₂ Nanocrystals for Low Overpotential Oxygen Evolution Reaction

et al. 2014

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Electrochemical oxygen evolution reaction (OER) involves high overpotential at oxygen evolving electrode and thereby suffers significant energy loss in the proton exchange membrane water electrolyzer. In order to reduce the OER overpotential, precious ruthenium and iridium oxides are most commonly used as anode electrocatalyst. Here we report marked reduction in overpotential for the OER using transition metal (TM) doped TiO 2 nanocrystals (NCs). This reduction in overpotential is attributed to d-orbitals splitting of the doped TMs in the TM-doped TiO 2 NCs and their interactions with the oxyradicals (intermediates of OER) facilitating the OER. The d-orbital spitting of TMs in TM-doped TiO 2 NCs is evident from the change in original pearl white color of undoped TiO 2 NCs and UV-vis absorption spectra. Hu et al. reported improved OER activity of IrO 2 /Nb−TiO 2 catalyst as compared to unsupported IrO 2 catalyst. 11 This suggests potential of TiO 2 as electrocatalyst in addition to its advantageous properties of high thermal and chemical stability, lost cost, and commercial availability. Recently, Cai et al. reported enhanced OER with Co-doped TiO 2 nanowires synthesized by sol-flame process. 20 A few other recent reports also confirm the reduction of OER overpotential with TM-doped TiO 2 . 21,22 However, the exact rationality behind such improved performance remains unclear. Here we report reduced overpotential of OER using TM-doped TiO 2 nanocrystals (NCs) synthesized by a facile low temperature hydrothermal technique. This reduced overpotential is attributed to d-orbital splitting of TMs in TiO 2 NCs producing mid gap energy states as confirmed from the UV-vis absorption spectroscopy. The d-orbital splitting of three TMs (Fe, Co, and Cu) and their role in OER overpotential is discussed in the present report. 2. EXPERIMENTAL DETAILS 2.1 Materials. All the chemicals were analytical grade and used as received without further purification. Titanium tetraisopropoxide (TTIP) [99.999%], Cu(NO 3 ) 2 .3H 2 O, Fe(SO 4 ).7H 2 O, Co(NO 3 ) 2 .6H 2 O, tetrabutyl ammonium hydroxide (TBAH) [(C 4 H 9 ) 4 NOH in 0.1 N aqueous], and diethanolamine (DEA) were purchased from Merck. Synthesis of TM doped TiO 2 NCs.In a typical synthesis, 3 mmol of TTIP was added in a mixture of TBAH (40 mmol) and DEA (160 mmol), and stirred for 5 min at room temperature. Then the viscous solution was transferred to a Teflon-lined stainless steel autoclave and heated at 225 °C for 24 h. After the heat treatment, the autoclave was allowed to cool down to room temperature naturally and the product was collected by centrifuge and washed with water and ethanol several times. The final product was dried in air at 60 °C for 24 h. The overall yield of the product was 90−95 %. TM-doped TiO 2 NCs was synthesized by

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“…However, its low electrical conductivity and small surface area prevent its potential application in fuel cells as a catalyst support [17]. Therefore, it is essential to tune the microstructure of the TiO 2 support to reduce undesirable side effects associated with low electrical conductivity and poor interaction between the active Pt nanoparticles (Pt NPs) and TiO x support [14,18].…”

Section: Introductionmentioning

confidence: 99%

TiO2 nanofibers heterogeneously wrapped with reduced graphene oxide as efficient Pt electrocatalyst supports for methanol oxidation

Zhuang

Zhu

et al. 2015

International Journal of Hydrogen Energy

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IrO2/Nb–TiO2 electrocatalyst for oxygen evolution reaction in acidic medium

Cited by 118 publications

References 52 publications

A Co/metal–organic-framework bifunctional electrocatalyst: The effect of the surface cobalt oxidation state on oxygen evolution/reduction reactions in an alkaline electrolyte

A Co/metal–organic-framework bifunctional electrocatalyst: The effect of the surface cobalt oxidation state on oxygen evolution/reduction reactions in an alkaline electrolyte

Engineered Electronic States of Transition Metal Doped TiO₂ Nanocrystals for Low Overpotential Oxygen Evolution Reaction

TiO2 nanofibers heterogeneously wrapped with reduced graphene oxide as efficient Pt electrocatalyst supports for methanol oxidation

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IrO2/Nb–TiO2 electrocatalyst for oxygen evolution reaction in acidic medium

Cited by 118 publications

References 52 publications

A Co/metal–organic-framework bifunctional electrocatalyst: The effect of the surface cobalt oxidation state on oxygen evolution/reduction reactions in an alkaline electrolyte

A Co/metal–organic-framework bifunctional electrocatalyst: The effect of the surface cobalt oxidation state on oxygen evolution/reduction reactions in an alkaline electrolyte

Engineered Electronic States of Transition Metal Doped TiO2 Nanocrystals for Low Overpotential Oxygen Evolution Reaction

TiO2 nanofibers heterogeneously wrapped with reduced graphene oxide as efficient Pt electrocatalyst supports for methanol oxidation

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Engineered Electronic States of Transition Metal Doped TiO₂ Nanocrystals for Low Overpotential Oxygen Evolution Reaction