Lanthanide metal-assisted synthesis of rhombic dodecahedral MNi (M = Ir and Pt) nanoframes toward efficient oxygen evolution catalysis

Jin, Haneul; Hong, Yong-Ju; Yoon, Jisun; Oh, Aram; Chaudhari, Nitin K.; Baik, Hionsuck; Joo, Sang Hoon; Lee, Kwangyeol

doi:10.1016/j.nanoen.2017.10.033

Cited by 100 publications

(60 citation statements)

References 53 publications

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“…Although, many efforts have focused on the designing and engineering of Ir-based OER catalysts by modifying morphologies or compositions. For example, Ir-based nanoclusters [12], Co-doped IrCu alloys [13], IrNi oxides [14], Ir-based nanoframes [15] have been reported recently, most researches are focused on Ir-based nanoparticles (NPs) or some irregular materials by wet chemical synthesis, but the surfactants attached on the surface of the catalysts not easy to remove [16]. Furthermore, these Ir-based catalysts are usually pasted on carbon supports by addition of binding materials (e.g.…”

Section: Introductionmentioning

confidence: 99%

3D nanoporous iridium-based alloy microwires for efficient oxygen evolution in acidic media

et al. 2019

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Although significant progresses have been achieved recently in developing catalysts for electrochemical oxygen evolution in alkaline electrolytes, high performance catalysts toward oxygen evolution in acidic media have not been realized in spite of the technical importance for the development of promising energy transformation technologies including electrocatalytic water splitting, integrated (photo)electrochemistry cells, rechargeable metal-air batteries, and so on. Here, we synthesized a three-dimensional nanoporous Ir 70 Ni 30-x Co x alloy microwires as oxygen evolution reaction electrocatalyst using a dealloying strategy. The three dimensional binderfree np-Ir 70 Ni 15 Co 15 catalyst in 0.1 M HClO 4 shows a low overpotential (220 mV@ η = 10 mA cm −2), low Tafel slope (44.1 mV dec −1) and excellent corrosion resistance, significantly outperforming commercial IrO 2 catalysts. The excellent performance is attributed to the nanoporous structure and the alloying effect, which promote the permeation of electrolyte, accelerate the transportation of electrons. More importantly, the high valence Ir oxide species with low-coordination structure in np-Ir 70 Ni 15 Co 15 alloy are identified for the real catalytic sites of OER process by the XAS results acquired on synchrotron radiation. This work not only provides fundamental understandings of the correlation between surface activity and stability for OER catalysts, but also paves a new way to advanced electrocatalysts working in acidic media.

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Section: Introductionmentioning

confidence: 99%

3D nanoporous iridium-based alloy microwires for efficient oxygen evolution in acidic media

et al. 2019

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“…Specifically, only the diffraction patterns belonging to the Ni-rich phase PtNi nanoalloy (2θ = ~43.7, 50.7 and 74.5 o ) can be observed for the sample of PtNi5-0; while an additional diffraction pattern belonging to the Pt-rich phase PtNi nanoalloy (2θ = ~40.5 -42.1 o ) is evolved for the samples of PtNi5-n (n = 0.1, 0.3, 0.5 and 0.7 MPa), 24 which verifies the strong in-situ inducing effect of H2 on Pt surface segregations, especially for the scenario of PH2 of 0.3 MPa displaying the strongest peak intensity at 2θ of ~40.8 o . Moreover, the specific ratios of the Pt and Ni in Pt-rich and Ni-rich phases of the PtNi5-n were further predicted based on the Vegard's rule, 25 as shown in Fig. 1b (or see Supplementary Table S2).…”

Section: Resultsmentioning

confidence: 93%

H2 In-situ Inducing Strategy on Pt Surface Segregation over Low Pt Doped PtNi5 Nanoalloy with Superhigh Alkaline HER Activity

Zhang

Liang

et al. 2020

Preprint

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Surface segregation constitutes an efficient approach to enhance the alkaline hydrogen evolution reaction (HER) activity of the bimetallic PtxNiy nanoalloys. Herein, we propose a new strategy by utilizing the small gas molecule of H2 as the structure directing agent (SDA) to in-situ induce Pt surface segregations over a series of PtNi5-n samples with extremely low Pt dopings (Pt/Ni = 0.2). Impressively, the sample of PtNi5-0.3 synthesized under 0.3 MPa H2 delivers an unprecedentedly low overpotential of 12.8 mV (-10 mA cm-2) and Tafel slop of 14.1 mV dec-1, which is superior than most of previously reported PtxNiy electrocatalyst. This is closely related to the strong in-situ inducing effect of H2 (0.3 MPa) leading to an obvious Pt-rich@Ni-rich core-shell nanostructure which can efficiently reduce the reaction Gibbs free energies. Finally, the specific mechanistic effects of H2 during PtNi5-n synthesis process are well illustrated based on the combined experimental and theoretical studies.

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“…After analyzing the post‐stability‐test, they found that although proportions of Ir 4+ and Ni dissolve, IrNi and IrO x are largely remained, contributing to this good stability. In the OER evaluation, it achieved an overpotential of 313.6 mV at 10 mA cm −2 and loss of only 15.7 mV at 10 mA cm −2 after 5000 potential cycles …”

Section: Electrocatalysis Of Interfacial Engineered Bimetal Based Catmentioning

confidence: 99%

Opportunities and Challenges of Interface Engineering in Bimetallic Nanostructure for Enhanced Electrocatalysis

Shao

Wang

Huang

2018

Adv Funct Materials

269

127

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The development of bimetal based catalysts via interfacial engineered strategy has been intensively explored due to its great potential for enhancing the electrochemical performance. The significant progress achieved by the interfacial engineering is mainly derived from its great ability on tuning the intermediate adsorption, controlling the electron and mass transportation, preventing catalysts from serious aggregation, as well as providing advanced promoter for the rational design of highly efficient catalysts. Here, the recent works on the interfacial engineered strategy for developing highly efficient bimetal based electrocatalysts are outlined. The advantages of interfacial engineered strategy on manipulating the activity, selectivity, and stability of catalysts are first discussed. The recent synthetic approaches for controlling the interface structures and the related hydrogen evolution reaction, oxygen evolution reaction, oxygen reduction reaction, and electroreduction of carbon dioxide are elaborated based on three major categories, involving metal/metal, metal/metal compound, and metal/support interfaces. Challenges and perspectives of this field are represented in the final section.deeply investigated with the assistances of DFT calculation and advanced characterization technologies. [32][33][34] Nowadays, since the interfacial engineering of bimetal based catalysts has become a focus of the electrocatalysis with great achievements, we believe that summarizing the newly emerged interfacial engineered electrocatalysts with novel architectures is at most important for the future widespread applications of bimetal based catalysts. The constructed bimetal based catalysts and their derived interfaces are various, such as metal/metal interface, metal/organic interface, metal/sulfide interface, metal/boride interface, metal/hydroxide interface, metal/phosphide interface, and metal/oxide interface (Scheme 1). [35][36][37][38][39][40][41][42] All of these interfaces can be generally categorized into three major groups, based on the type of the interface: 1) metal/metal(alloy), 2) metal/metal compound, and 3) metal/support. The pathways that prepare these three kinds of interfaces can be grouped into two categories. One is the direct synthesis method and the other is the synthesis with post processing.The aim of this review is to build a bridge between the interfacial engineered bimetal based electrocatalysts and the novel electro-applications in order to develop catalysts with maximized performance. First of all, the roles of interfaces in improving the activity, selectivity and stability of electrocatalysis are illustrated. A deep understanding of the mechanism will be helpful to propose new pathways for the design of high-performance electrocatalysts. Then the synthetic methods for effectively constructing the metal/metal(alloy), metal/metal compound, and metal/support interfaces are introduced. The applications of interfacial engineered catalysts in the electrocatalysis, including oxygen reduction reaction (...

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Lanthanide metal-assisted synthesis of rhombic dodecahedral MNi (M = Ir and Pt) nanoframes toward efficient oxygen evolution catalysis

Cited by 100 publications

References 53 publications

3D nanoporous iridium-based alloy microwires for efficient oxygen evolution in acidic media

3D nanoporous iridium-based alloy microwires for efficient oxygen evolution in acidic media

H2 In-situ Inducing Strategy on Pt Surface Segregation over Low Pt Doped PtNi5 Nanoalloy with Superhigh Alkaline HER Activity

Opportunities and Challenges of Interface Engineering in Bimetallic Nanostructure for Enhanced Electrocatalysis

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