Ultrathin-shell IrCo hollow nanospheres as highly efficient electrocatalysts towards the oxygen evolution reaction in acidic media

Zhu, Jinhui; Wei, Min; Meng, Qinghao; Chen, Zhenyu; Fan, Yepeng; Hasan, Syed Waqar; Zhang, Xiaoran; Lyu, Dandan; Tian, Zhi Qun; Shen, Pei Kang

doi:10.1039/d0nr06601j

Cited by 30 publications

(18 citation statements)

References 45 publications

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“…These catalytic properties are evaluated using ASF, and then, the ASF of our electrocatalyst was twice that of a monometallic Ir nanoporous structure in our previous work. The ASF of the prepared sample exceeded those of all previously reported IrCo alloy OER electrocatalysts as well. − Additional stability tests were performed, demonstrating the possibility for commercialization. Overall, the three-dimensionally interconnected Ir 3 Co-core@IrO 2 -shell electrocatalyst with high surface area is a promising candidate for the acidic OER.…”

Section: Introductionmentioning

confidence: 65%

Promoting Oxygen Evolution Reaction Induced by Synergetic Geometric and Electronic Effects of IrCo Thin-Film Electrocatalysts

et al. 2022

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The advancement of water electrolysis technology has seemingly plateaued. Further advances require new strategies to address the key limitations of the oxygen evolution reaction: high overpotential and low stability of electrode materials. Herein, we designed a nanoporous Ir3Co-core@IrO2-shell electrocatalyst with 5 and 3 times higher mass activity and 6 and 2 times higher activity–stability factors than conventional IrO2 nanoparticles and Ir nanoporous electrocatalysts, respectively. The origin of the performance enhancement in the Ir3Co-core@IrO2-shell electrocatalyst was revealed in computational density functional theory calculations. The residual Co after the dealloying process resulted in a down-shift of the d-band center position, thus weakening the −OH* adsorption energy. In addition, the electronic conductivity was enhanced by the three-dimensionally interconnected structure. Under high-current-density operating conditions, the Ohmic losses were reduced by the ultrafast charge transfer pathway provided by the metallic IrCo core.

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Section: Introductionmentioning

confidence: 65%

Promoting Oxygen Evolution Reaction Induced by Synergetic Geometric and Electronic Effects of IrCo Thin-Film Electrocatalysts

et al. 2022

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“…2(a) and 2(b)). In addition, the lattice strain inside the crystal due to the relative displacement between the lattices can also affect the catalytic performance [77]. For example, IrCo hollow nanospheres with ultrathin shells were synthesized by the continuous reduction method with NaBH 4 , which exhibited high-efficiency OER activity and long-term durability [78].…”

Section: Geometric Effectmentioning

confidence: 99%

Iridium-based catalysts for oxygen evolution reaction in acidic media: Mechanism, catalytic promotion effects and recent progress

Wang¹,

Schechter²,

Feng³

2023

Nano Research Energy

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Iridium (Ir)-based catalysts are highly efficient for the anodic oxygen evolution reaction (OER) due to high stability and anticorrosion ability in the strong acid electrolyte. Recently, intensive attention has been directed to novel, efficient, and lowcost Ir-based catalysts to overcome the challenges of their application in the water electrolysis technique. To make a comprehensive understanding of the recently developed Ir-based catalysts and their catalytic properties, the mechanism and catalytic promotion principles of Ir-based catalysts were discussed for OER in the acid condition aimed for the proton exchange membrane water electrolyzer (PEMWE) in this review. The OER catalytic mechanisms of the adsorbate evolution mechanism and the lattice oxygen mechanism were first presented and discussed for easy understanding of the catalytic mechanism; a brief perspective analysis of promotion principles from the aspects of geometric effect, electronic effect, synergistic effect, defect engineering, support effect was concluded. Then, the latest progress and the practical application of Ir-based catalysts were introduced in detail, which was classified into the varied composition of Ir catalyst in terms of alloys, hetero-element doping, perovskite, pyrochlore, heterostructure, core-shell structure, and supported catalysts. Finally, the problems and challenges faced by the current Ir-based catalyst in the acidic electrolyte were put forward. It is concluded that highly efficient catalysts with low Ir loading should be developed in the future, and attention should be paid to probing the structural and performance correlation, and their application in real PEMWE devices. Hopefully, the current effort can be helpful in the catalysis mechanism understanding of Ir-based catalysts for OER, and instructive to the novel efficient catalysts design and fabrication.

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“…Proton exchange membrane water electrolysis (PEMWE) is under intensive investigation because of its advantages over the conventional alkaline water electrolysis, such as high energy efficiency and hydrogen purity. − However, high loadings of expensive iridium (Ir)-based catalysts (2–4 mg (Ir) cm –2 ) are commonly required to achieve high performance for the oxygen evolution reaction (OER) at the anode, thus restricting the large-scale industrialization of PEMWE. − To address this issue, numerous efforts have been devoted to developing highly active catalysts with low Ir content by increasing the intrinsic activity of the catalysts. − Nevertheless, the practical application of the PEMWEs usually runs at high current densities (≥1–2 A cm –2 ) for efficient H 2 production, , which needs to concurrently address the issues of insufficient catalyst utilization, limited mass transport, and high ohmic resistance within the membrane electrode assembly (MEA) . Therefore, the overall design of MEA with maximized triple-phase boundaries, enlarged membrane/catalytic layer (CL) interface, and rapid mass transport pathways is essential to reduce the polarization of the kinetic, mass transport, and ohmic losses.…”

mentioning

confidence: 99%

Overall Design of Anode with Gradient Ordered Structure with Low Iridium Loading for Proton Exchange Membrane Water Electrolysis

et al. 2022

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Insufficient catalyst utilization, limited mass transport, and high ohmic resistance of the conventional membrane electrode assembly (MEA) lead to significant performance losses of proton exchange membrane water electrolysis (PEMWE). Herein we propose a novel ordered MEA based on anode with a 3D membrane/catalytic layer (CL) interface and gradient tapered arrays by the nanoimprinting method, confirmed by energy dispersive spectroscopy. Benefiting from the maximized triple-phase interface, rapid mass transport, and gradient CL by overall design, such an ordered structure with Ir loading of 0.2 mg cm–2 not only greatly increases the electrochemical active area by 4.2 times but also decreases the overpotentials of both mass transport and ohmic polarization by 13.9% and 8.7%, respectively, compared with conventional MEA with an Ir loading of 2 mg cm–2, thus ensuring a superior performance (1.801 V at 2 A cm–2) and good stability. This work provides a new strategy of designing MEA for high-performance PEMWE.

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Ultrathin-shell IrCo hollow nanospheres as highly efficient electrocatalysts towards the oxygen evolution reaction in acidic media

Abstract: IrCo hollow nanospheres featuring a novel structure with ultrathin continuous shells are synthesized and exhibit the outstanding oxygen evolution reaction performance.

Cited by 30 publications

References 45 publications

Promoting Oxygen Evolution Reaction Induced by Synergetic Geometric and Electronic Effects of IrCo Thin-Film Electrocatalysts

Promoting Oxygen Evolution Reaction Induced by Synergetic Geometric and Electronic Effects of IrCo Thin-Film Electrocatalysts

Iridium-based catalysts for oxygen evolution reaction in acidic media: Mechanism, catalytic promotion effects and recent progress

Overall Design of Anode with Gradient Ordered Structure with Low Iridium Loading for Proton Exchange Membrane Water Electrolysis

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