Mesoporous Metallic Iridium Nanosheets

Jiang, Bo; Guo, Yanna; Kim, Jeonghun; Whitten, Andrew E.; Wood, Kathleen; Kani, Kenya; Rowan, Alan E.; Henzie, Joel; Yamauchi, Yusuke

doi:10.1021/jacs.8b05206

Cited by 371 publications

(309 citation statements)

References 48 publications

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“…Ir-based nanoclusters [13] and nanosheets, [14] and others. [15][16][17][18][19][20][21][22][23][24] However, these works mainly focused on Ir-based binary or ternary alloys and the Ir component is over 50 at%.…”

Section: Doi: 101002/smll201904180mentioning

confidence: 99%

Nanoporous Al‐Ni‐Co‐Ir‐Mo High‐Entropy Alloy for Record‐High Water Splitting Activity in Acidic Environments

Jin

Jia

et al. 2019

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Ir‐based binary and ternary alloys are effective catalysts for the electrochemical oxygen evolution reaction (OER) in acidic solutions. Nevertheless, decreasing the Ir content to less than 50 at% while maintaining or even enhancing the overall electrocatalytic activity and durability remains a grand challenge. Herein, by dealloying predesigned Al‐based precursor alloys, it is possible to controllably incorporate Ir with another four metal elements into one single nanostructured phase with merely ≈20 at% Ir. The obtained nanoporous quinary alloys, i.e., nanoporous high‐entropy alloys (np‐HEAs) provide infinite possibilities for tuning alloy's electronic properties and maximizing catalytic activities owing to the endless element combinations. Particularly, a record‐high OER activity is found for a quinary AlNiCoIrMo np‐HEA. Forming HEAs also greatly enhances the structural and catalytic durability regardless of the alloy compositions. With the advantages of low Ir loading and high activity, these np‐HEA catalysts are very promising and suitable for activity tailoring/maximization.

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Section: Doi: 101002/smll201904180mentioning

confidence: 99%

Nanoporous Al‐Ni‐Co‐Ir‐Mo High‐Entropy Alloy for Record‐High Water Splitting Activity in Acidic Environments

Jin

Jia

et al. 2019

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271

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“…2D mesoporous carbon materials have been synthesized by Zhao and coworkers via hydrothermal reaction‐induced coassembly of surfactants and carbon source on the surface of oxide substrates, followed by carbonization and removal of substrates via chemical etching . Mesoporous metallic iridium nanosheets with arrayed mesopores have been synthesized based on the coassembly of amphiphilic block copolymers and metallic iridium species in situ formed in N , N ‐dimethylformamide solution through reduction of IrCl 3 by formic acid . 2D mesoporous conducting polymers were obtained by redox polymerization of pyrrole/aniline on single‐layer graphene oxide or at the interface of 2D lipid bilayers derived from aliphatic amine or perfluorocarboxylic acids .…”

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confidence: 99%

“…[29,30] Mesoporous metallic iridium nanosheets with arrayed mesopores have been synthesized based on the coassembly of amphiphilic block copolymers and metallic iridium species in situ formed in N,N-dimethylformamide solution through reduction of IrCl 3 by formic acid. [31] 2D mesoporous conducting polymers were obtained by redox polymerization of pyrrole/aniline on single-layer graphene oxide or at the interface of 2D lipid bilayers derived from aliphatic amine or perfluorocarboxylic acids. [32][33][34] Unfortunately, these methods are not suitable for the synthesis of other single-layer ordered mesoporous materials (SOMMs; e.g., silica and crystalline metal oxides) with desired features such as large mesopores, high ordering over large domains, and crystalline framework.…”

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A Universal Lab‐on‐Salt‐Particle Approach to 2D Single‐Layer Ordered Mesoporous Materials

et al. 2020

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The advantages of existing ordered mesoporous materials have not yet been fully realized, due to their limited accessibility of in‐pore surface and long mass‐diffusion length. A general, controllable, and scalable synthesis of a family of two‐dimensional (2D) single‐layer ordered mesoporous materials (SOMMs) with completely exposed mesopore channels, significantly improved mass diffusion, and diverse framework composition is reported here. The SOMMs are synthesized via a surface‐limited cooperative assembly (SLCA) on water‐removable substrates of inorganic salts (e.g., NaCl), combined with vacuum filtration. As a proof of concept, the obtained CeO2‐based SOMMs show superior catalytic performance in CO oxidation with high conversion efficiency, ≈33 times higher than that of conventional bulk mesoporous CeO2. This SLCA is a promising approach for developing next‐generation porous materials for various applications.

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“…Mesoporous materials are becoming attractive materials for their various applications in, e.g., drug delivery, energy storage, and energy generation, as well as other fields. [ 1–8 ] In energy storage devices, mesoporous carbons can function as efficient electron transfer media to improve the performance of electric double‐layer capacitors (EDLCs). [ 9 ] Furthermore, the blending of a self‐assembled block copolymer with the carbon source (e.g., phenolic resin) is becoming more widespread.…”

Section: Introductionmentioning

confidence: 99%

Varying the Hydrogen Bonding Strength in Phenolic/PEO‐b‐PLA Blends Provides Mesoporous Carbons Having Large Accessible Pores Suitable for Energy Storage

Lee

Ahmed

et al. 2020

Macro Chemistry & Physics

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as efficient electron transfer media to improve the performance of electric double-layer capacitors (EDLCs). [9] Furthermore, the blending of a self-assembled block copolymer with the carbon source (e.g., phenolic resin) is becoming more widespread. This method has the advantage of providing well-ordered mesoporous structures that can be used efficiently in various applications. [10,11] Typically, a block copolymer that forms a self-assembled structure is mixed with a carbon source to obtain various dimensional carbon structures. The blending of a commercial Pluronic-type triblock copolymer, such as poly(ethylene oxide-b-propylene oxideb-ethylene oxide), as the template is the method used most widely to prepare mesoporous materials. [12][13][14][15][16][17][18][19] Because of limitations in molecular weight and composition, it can, however, be difficult to prepare mesoporous materials having pore sizes of greater than 10 nm when using Pluronic-type triblock copolymers. Block copolymers featuring long hydrophobic segments and high molecular weight-for instance, poly(ethylene oxideb-styrene) (PEO-b-PS) [20,21] and poly(ethylene oxide-b-methyl methacrylate) (PEO-b-PMMA) [22] -are promising candidates as templates to prepare large-pore-size mesoporous carbons. For example, Zhao et al. prepared mesoporous carbons with long-range order, large surface areas (>1500 m 2 g −1 ), and large pores (≈23 nm) when using PEO 125 -b-PS 230 as the template as displayed in Scheme S1a-c in the Supporting Information. [21] With PEO 125 -b-PMMA 114 as the template, they obtained mesoporous carbons having large surface areas (>1500 m 2 g −1 ) and pores (≈10 nm) [22] when applying resol as the carbon source. Mesoporous carbons with smaller pores but thicker walls were obtained when using PEO-b-PMMA as the template, rather than PEO-b-PS, because the phenolic OH units could interact strongly with the PEO segment (interassociation equilibrium constant (K A ) = 286) [23] and weakly with the PMMA CO units (K A = 20) [24,25] through hydrogen bonding, but not with the hydrophobic PS segment. Indeed, the PS block segment would undergo complete microphase In this study, mesoporous carbons are prepared by using a resol-type phenolic resin as the carbon source and poly(ethylene oxide-b-lactic acid) (PEO-b-PLA) copolymer as the template, with a process of thermal curing, calcination, carbonization, and activation. The structures of these mesoporous carbons are strongly influenced by the self-assembled structures formed from phenolic/PEO-b-PLA blends, varying from double-gyroid, to cylinder, and finally to spherical micelle structures upon increasing the phenolic concentrations. The large pores (>20 nm) and high surface areas (>1000 m 2 g −1 ) of these activated mesoporous carbons arise because the phenolic resin interacts only with the PEO segment (i.e., not with the PLA segment) through hydrogen bonding; thus, the relative wall thickness of the phenolic matrix decreases after template removal (thereby increasing the pore size), similar to the beha...

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Mesoporous Metallic Iridium Nanosheets

Cited by 371 publications

References 48 publications

Nanoporous Al‐Ni‐Co‐Ir‐Mo High‐Entropy Alloy for Record‐High Water Splitting Activity in Acidic Environments

Nanoporous Al‐Ni‐Co‐Ir‐Mo High‐Entropy Alloy for Record‐High Water Splitting Activity in Acidic Environments

A Universal Lab‐on‐Salt‐Particle Approach to 2D Single‐Layer Ordered Mesoporous Materials

Varying the Hydrogen Bonding Strength in Phenolic/PEO‐b‐PLA Blends Provides Mesoporous Carbons Having Large Accessible Pores Suitable for Energy Storage

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