Hollow porous rhodium nanoballs

Zhang, Jiawei; Jiang, Yating; Shi, Shulin; Li, Huiqi; Chen, Jiayu; Kuang, Qin; Xie, Zhaoxiong; Zheng, Lan‐Sun

doi:10.1039/c9cc01572h

Cited by 15 publications

(10 citation statements)

References 26 publications

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“…Further TEM observation ( Figures 1E,F) reveals that the Mo-PD-3 sphere possesses an ultrathin shell composed of nanosheets about several nanometers in size, among which numerous mesopores are generated. Moreover, the outer layer is dendritic, which would endow abundant low-coordinated sites on the branch surface and electron transfer pathway (Zhong et al, 2018;Chen et al, 2019;Zhang et al, 2019). In addition, the thickness of the outer layer is controllable by varying the dopamine hydrochloride precursor amount.…”

Section: Resultsmentioning

confidence: 99%

In situ Engineering of Hollow Porous Mo2C@C Nanoballs Derived From Giant Mo-Polydopamine Clusters as Highly Efficient Electrocatalysts for Hydrogen Evolution

Liu

Cheng

et al. 2020

Front. Chem.

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Low-cost and highly effective catalysts are crucial to the electrocatalytic hydrogen evolution reaction (HER). Among non-noble catalysts, molybdenum carbides are promising candidates because of their high reserves, stability, low cost, and structural diversity. In this work, we report a simple method to fabricate a hollow porous Mo 2 C@C nanoball through a hydrothermal preparation process of molybdenum precursors at high temperatures. Specifically, we have combined interfacial polymerization and the chelation effect to synthesize the Mo-polydopamine (Mo-PDA) precursor. As a result, Mo 2 C@C-3 only requires an ultralow Tafel slope (∼55 mV dec −1) and low overpotential (η 50 ≈ 167 mV) in a 0.5 M H 2 SO 4 solution with long-term cycling stability. Besides, it also exhibits outstanding activity and stability under extensive HER testing in alkaline media. This study is promising for the development of advanced molybdenum carbide electrocatalysts toward electrochemical applications.

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Section: Resultsmentioning

confidence: 99%

In situ Engineering of Hollow Porous Mo2C@C Nanoballs Derived From Giant Mo-Polydopamine Clusters as Highly Efficient Electrocatalysts for Hydrogen Evolution

Liu

Cheng

et al. 2020

Front. Chem.

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“…Initial Rh hollow spheres generated through reducing Rh 3+ ions at interface between water and HEDP would further lead to ultrathin porous nanosheets (Figure 8h-j). Another case is that micelle-like sphere formed by adequate tetrabutylammonium bromide (TBAB) in 1-octanol solution, [73] and hollow Rh nanoballs with porous surfaces would be obtained with soft template TBAB and reductant 1-octanol (Figure 8k-n). In aqueous solution, nanodomain formed by ionic liquid with a controllable broad size distribution depending on solvent composition could also act as soft template for hierarchical porous structure.…”

Section: Soft Template Strategymentioning

confidence: 99%

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confidence: 99%

Porous Noble Metal Electrocatalysts: Synthesis, Performance, and Development

Chen

2021

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Benefiting from the various structures of channel, skeleton, and pore wall, porous materials are more valuable than nonporous and ultra-small counterparts in practical applications. In regard to porous catalyst, higher surface area logically means more exposed active sites, and reasonable channel structure ensures the accessibility of active sites. Optimization of pore structure, which includes pore size, pore dimensions, and the pore size distributions, would bring enhanced catalytic activity. Besides, to a certain extent, compared with ultra-fine or ultrasmall nanocrystals, porous catalysts constructed by primary particles have higher stability to ensure maximum retention of active sites, and the increased stability can be attributed to the suppression of Ostwald ripening. Meanwhile the influence of porous structure on the catalytic selectivity cannot be ignored, for instance, microporous materials have a shape-selective catalytic effect on reactants, intermediates, and products of different sizes. In porous materials with larger pores, for catalytic reactions with multi-stage reaction products, the mass transfer Active sites (intrinsic activity, quantity, and distribution), electron transfer, and mass diffusion are three important factors affecting the performance of electrocatalysts. Composed of highly active components which are built into various network structures, porous noble metal is an inherently promising electrocatalysts. In recent years, great efforts have been made to explore new efficient synthesis methods and establish structural-performance relationships in the field of porous noble metal electrocatalysis. In this review, the very recent progress in strategies for preparing porous noble metal, including innovation and deeper understanding of traditional methods is summarized. A discussion of relationship between porous noble metal structure and electrocatalytic performance, such as accessibility of active sites, connectivity of skeleton structures, channels dimensions, and hierarchical structures, is provided. rate affected by the shape and dimensions of the pores can also affect the diffusion rate of the primary reaction products and improve the selectivity of the secondary reaction products. [1] For solid catalysts, the species and coordination state of surface atoms could influence the intrinsic activity of active sites, and in porous materials with tortuous channel structure and rough pore wall, atoms with different coordination states exposed on the pore wall would exert different abilities to adsorb and activate reactant molecules.Noble metals possess suitable electronic structures, which gives it a significant innate advantage of excellent catalytic activity and stability. From the perspective of d-band center theory, proper d-band center positions of the noble metals give rise to a moderate chemical adsorption strength for the reactants, intermediate species, and products during the catalytic process. This means noble metals can adsorb and activate the reactant molecules moderately while...

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“…According to previous reports, Rh nanomaterials are also excellent electrocatalyst and have been widely applied in many energy‐related electrocatalytic reactions, including hydrazine oxidation reaction, [ 6 ] nitrogen reduction reaction, [ 7 ] oxygen evolution reaction, [ 8 ] and ammonia oxidation reaction, [ 1c ] and so on. Especially, Rh‐based nanomaterials show very high electroactivity for alcohol oxidation reactions, which even exceed Pt‐based nanomaterials for some special electrocatalytic reaction, such as methanol oxidation reaction, [ 9 ] formic acid oxidation reaction, [ 10 ] ethanol oxidation reaction, [ 11 ] isopropanol oxidation reaction, [ 12 ] and so on. For example, Rh nanowires, mesoporous Rh nanocrystals, and porous Rh nanosheets exhibited higher electrocatalytic activity toward the methanol oxidation than that of commercial Pt nanocrystals.…”

Section: Introductionmentioning

confidence: 99%

“…[ 9a,13 ] Excavated Rh nanobranches and porous Rh nanoballs showed excellent activity for the ethanol oxidation reaction. [ 11,14 ] After alloying Rh with a transition metal, their electroactivity for the ethanol or methanol oxidation can be further enhanced. [ 15 ] However, there are only a few reports about EGOR on Rh‐based electrocatalyst up to now.…”

Section: Introductionmentioning

confidence: 99%

Highly Active Hollow RhCu Nanoboxes toward Ethylene Glycol Electrooxidation

Qiao

Yang

Shi

et al. 2021

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The efficient electrocatalysts toward the ethylene glycol oxidation reaction (EGOR) are highly desirable for direct ethylene glycol fuel cells because of the sluggish kinetics of anodic EGOR. Herein, porous RhCu nanoboxes are successfully prepared through facile galvanic replacement reaction and succedent sodium borohydride reduction strategy. Benefiting from hierarchical pore structure, RhCu nanoboxes display excellent electrocatalytic performance toward the EGOR in alkaline medium with a mass activity of 775.1 A gRh−1, which is 2.8 times as large as that of commercial Rh nanocrystals. Moreover, the long‐term stability of RhCu nanoboxes is better than that of commercial Rh nanocrystals. Furthermore, the theoretical calculations demonstrate that RhCu nanoboxes possess lower adsorption energy of CO and lower reaction barrier (0.27 eV) for the COads oxidation with aid of the adsorbed OHads species, resulting in the outstanding electrocatalytic performance toward the EGOR. This work provides a meaningful reference for developing highly effective electrocatalysts toward the EGOR.

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Hollow porous rhodium nanoballs

Abstract: Hollow porous rhodium nanoballs are prepared via a facile one-pot reaction.

Cited by 15 publications

References 26 publications

In situ Engineering of Hollow Porous Mo2C@C Nanoballs Derived From Giant Mo-Polydopamine Clusters as Highly Efficient Electrocatalysts for Hydrogen Evolution

In situ Engineering of Hollow Porous Mo2C@C Nanoballs Derived From Giant Mo-Polydopamine Clusters as Highly Efficient Electrocatalysts for Hydrogen Evolution

Porous Noble Metal Electrocatalysts: Synthesis, Performance, and Development

Highly Active Hollow RhCu Nanoboxes toward Ethylene Glycol Electrooxidation

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