Investigation on IrO2 supported on hydrogenated TiO2 nanotube array as OER electro-catalyst for water electrolysis

Lu, Zhuoxin; Shi, Yan; Yan, Chuanwei; Guo, Chaozhong; Wang, Zhida

doi:10.1016/j.ijhydene.2016.12.098

Cited by 74 publications

(40 citation statements)

References 34 publications

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“…[10,11,19,21,22] Therefore, recently much research has been carried out for developing carbon-free electrocatalysts especially by using 3d transition metal oxides and hydroxides. [16,[23][24][25][26][27] Noticeable changes in the OER activity of these materials has been observed due to the crystalline phases, surfaces, heterostructures and morphology of nanoparticles. Therefore, it is indeed of great importance to designing an active and stable transition metal-based electrocatalyst for the overall water splitting remains as one of the pre-eminent tasks in this field of research.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the conductivity of TiO 2 is low and consequently, much work has been done on enhancing the conductivity by changing the morphology by the introduction of oxygen vacancy, hydrogenation or doping. [23][24][25][26] According to the Engel-Brewer theory, the electronic interaction between the Ti and the Ni and Co (both having hypo-d-electron character) can improve the electrocatalytic activity, optical, magnetic and electrical properties. This can also lead to the increase in the surface area and improvement in the stability of the TiO 2 supported catalysts.…”

Section: Introductionmentioning

confidence: 99%

“…in acid medium) can decrease the working efficiency and, thus, the overall performance of the catalysts ,,,,. Therefore, recently much research has been carried out for developing carbon‐free electrocatalysts especially by using 3d transition metal oxides and hydroxides ,. Noticeable changes in the OER activity of these materials has been observed due to the crystalline phases, surfaces, heterostructures and morphology of nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

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Layered TiO₂ Nanosheet‐Supported NiCo₂O₄ Nanoparticles as Bifunctional Electrocatalyst for Overall Water Splitting

2018

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Exploring the generation of efficient and long‐lasting bifunctional electrocatalysts obtained from low‐cost transition metal oxides is crucial to the optimal production of hydrogen and oxygen by electrocatalytic water splitting. This study aims to demonstrate the applicability of layered TiO2 nanosheets as support for designing electrocatalysts. We have demonstrated the performance by decorating the TiO2 support with NiCo2O4 nanoparticles (NiCo2O4/TiO2) as catalysts for electrocatalytic overall water splitting. Moreover, the corrosion effect of usually used carbon‐based supporting materials can decrease the working efficiency and, thus, the overall performance of the catalysts. In this aspect, TiO2 can be a better alternative to carbon‐based systems. Layered TiO2 was synthesized at room temperature, and a simple heat treatment protocol was employed for the large‐scale synthesis of NiCo2O4/TiO2. TiO2 facilitated the formation of smaller NiCo2O4 nanoparticles, also improving the dispersion. This bifunctional electrocatalyst exhibits high OER and HER performance with a low overpotential of 309 mV and 185 mV respectively, at a current density of 10 mA cm−2. TiO2 supported catalyst also exhibits other advantages like remarkable durability in the alkaline medium along with high turnover frequency (TOF) values. This inexpensive catalyst can deliver a current density of 10 mA cm−2 at only 1.64 V with a steady performance for more than 12 h for overall water splitting. Thus, this homemade system provides a proficient and low‐cost alternative to the more expensive systems such as RuO2, IrO2 or Pt for the electrochemical water splitting applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Layered TiO₂ Nanosheet‐Supported NiCo₂O₄ Nanoparticles as Bifunctional Electrocatalyst for Overall Water Splitting

2018

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“…Due to their low elemental abundance, hollow IrO 2 and RuO 2 with a high surface area-to-mass ratio have been widely studied. [65] With a small loading amount of 2.64 mg cm −2 , its stability is also greatly enhanced. Rutile IrO 2 nanotube arrays have been obtained by electrodepositing IrO 2 nanoparticles shell onto ZnO nanorod surface and a followed wet chemical etching of the ZnO core (Figure 4b).…”

Section: Oer With Rutilesmentioning

confidence: 99%

Hollow‐Structured Metal Oxides as Oxygen‐Related Catalysts

et al. 2018

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high overpotential and sluggish kinetics. Generally, Pt, IrO 2 , and RuO 2 noble metal catalysts have improved kinetics. But, the high cost and unsatisfactory long-term durability of noble-metal-based catalysts are the main limitations for large-scale commercial applications. Supplying flexible electronic structures, transition metal oxides are the optimal oxygen-related catalysts in which the adsorbents binding to metal cations (M) are neither too strong nor too weak. [9] With overall understanding of crystal structure for common transition metal oxides, it has been demonstrated that [MO 6 ] octahedral configuration effectively accelerates the charge transfer process during a redox reaction. [10] In the octahedral field, the transition metal 3d orbit will be split into e g and t 2g . The e g orbital directed toward an O 2 molecule overlaps the O-2p δ orbital more strongly than the overlap between the t 2g and O-2p π orbitals. It thereof determines the energy gained by both the adsorption/desorption of oxygen on transition metal ions. Furthermore, the hollow structure promotes their reaction kinetics and durability. [11,12] Here, we will focus on the hollow structures (spinels, perovskites, and rutiles) and their oxygenrelated catalysis properties. And general design strategies and precise fabrication of hollow-structured transition metal oxides for oxygen-related catalysis will be summarized. To simplify, the hollow structure discussed here is a system with independent inner voids and can be monodisperse. Advantage and Synthesis of Hollow Structures Importance of Hollow Structures in Oxygen-Related CatalysisA large surface area is critical for hollow structure in oxygenrelated catalysis. It can significantly increase the active sites and reduce the mass density of an energy conversion device. In some special systems, the consumption of co-catalysts (especially noble metal) could also be saved. [13] Meanwhile, large void size is another key feature for hollow structure. It will mitigate the effects of volume change, provide structural stability and enhance the metal-air battery cyclic performance. The interconnected channels will promote the mass transfer performance and enhance the rate capability. [14] In addition, the encapsulation ability of hollow structure can avoid catalyst poisoning and increase chemical and thermal stabilities. [15] With precise control of the geometric parameter (length, diameter, and shell thickness), a shortened charge transfer path is Metal oxide hollow structures with large surface area, low density, and high loading capacity have received great attention for energy-related applications. Acting as oxygen-related catalysts, hollow-structured transition metal oxides offer low overpotential, fast reaction rate, and excellent stability. Herein, recent progress in the oxygen-related catalysis (e.g., oxygen evolution reaction (OER), oxygen reduction reaction (ORR), and metal-air batteries) of hollow-structured transition metal oxides is discussed. Through a comprehensive outline of hollo...

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“…However, durability is inferior for the practical standpoint at high overpotentials. Moreover, rational electrode structures with Ti [17,18] , TiO 2 [19] , Ta 2 O 5 [20] , TiC [21] or Au/C [22] substrates were constructed to enhance the mass activities. KŠP et al [21] fabricated nano-sized Ir film on a TiC substrate to reduce the loading of noble metal.…”

Section: Introductionmentioning

confidence: 99%

An effective oxygen electrode based on Ir0.6Sn0.4O2 for PEM water electrolyzers

Jiang

Hao

et al. 2019

Journal of Energy Chemistry

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Investigation on IrO2 supported on hydrogenated TiO2 nanotube array as OER electro-catalyst for water electrolysis

Cited by 74 publications

References 34 publications

Layered TiO₂ Nanosheet‐Supported NiCo₂O₄ Nanoparticles as Bifunctional Electrocatalyst for Overall Water Splitting

Layered TiO₂ Nanosheet‐Supported NiCo₂O₄ Nanoparticles as Bifunctional Electrocatalyst for Overall Water Splitting

Hollow‐Structured Metal Oxides as Oxygen‐Related Catalysts

An effective oxygen electrode based on Ir0.6Sn0.4O2 for PEM water electrolyzers

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Investigation on IrO2 supported on hydrogenated TiO2 nanotube array as OER electro-catalyst for water electrolysis

Cited by 74 publications

References 34 publications

Layered TiO2 Nanosheet‐Supported NiCo2O4 Nanoparticles as Bifunctional Electrocatalyst for Overall Water Splitting

Layered TiO2 Nanosheet‐Supported NiCo2O4 Nanoparticles as Bifunctional Electrocatalyst for Overall Water Splitting

Hollow‐Structured Metal Oxides as Oxygen‐Related Catalysts

An effective oxygen electrode based on Ir0.6Sn0.4O2 for PEM water electrolyzers

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Layered TiO₂ Nanosheet‐Supported NiCo₂O₄ Nanoparticles as Bifunctional Electrocatalyst for Overall Water Splitting

Layered TiO₂ Nanosheet‐Supported NiCo₂O₄ Nanoparticles as Bifunctional Electrocatalyst for Overall Water Splitting