Exclusive Strain Effect Boosts Overall Water Splitting in PdCu/Ir Core/Shell Nanocrystals

Li, Menggang; Zhao, Zhonglong; Xia, Zhonghong; Luo, Mingchuan; Zhang, Qinghua; Qin, Yingnan; Lü, Tao; Yin, Kun; Chao, Yuguang; Gu, Lin; Yang, Weiwei; Lü, Gang; Guo, Shaojun

doi:10.1002/anie.202016199

Cited by 186 publications

(134 citation statements)

References 66 publications

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“…On the other hand, two primary effects (strain and ligand effect) in alloy surface will change the average bond lengths between the metal atoms, and can result in modifications of the surface electronic structures. [ 19‐22 ] Meanwhile, due to the different working functions between metal and graphene, electrons would transfer from the metal core to outer graphene layer, increasing the density of graphene states around the Fermi level and optimizing their kinetic processes for various elementary steps. [ 13,23 ] As such, it is possible to tailor the overall activity of M@NG either from graphene shell or from metal core.…”

Section: Introductionmentioning

confidence: 99%

MOFs‐Derived N‐Doped Carbon‐Encapsulated Metal/Alloy Electrocatalysts to Tune the Electronic Structure and Reactivity of Carbon Active Sites^†

Yang

Jiang

et al. 2021

Chin. J. Chem.

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Despite progress over the past few years in developing efficient low‐cost catalysts, precious metals are still the best catalysts for hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and oxygen reduction reaction (ORR). However, the natural scarcity and high cost greatly hamper their large‐scale commercialization. The combination of graphene shell with metal core could tune the electronic structure of carbon active sites. Recently, nitrogen doped graphene encapsulated metal or alloy (M@NG) has emerged as novel and fascinating electrocatalysts. In this review, we focus on some recent advances in designing M@NG electrocatalysts for HER, OER and ORR through tuning electronic structure and activity of carbon active sites. We have summarized some facile and universal strategy for synthesizing various M@NG via direct annealing of metal‐organic frameworks (MOFs). With elaborated MOFs precursor design, careful control over the nitrogen doping level, metal element types and alloy structure, the electronic structure of carbon active sites can be rationally tuned to optimize activity for different electrochemical reactions. We hope this review can provide new insights into the design of M@NG with high catalytic activity.

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Section: Introductionmentioning

confidence: 99%

MOFs‐Derived N‐Doped Carbon‐Encapsulated Metal/Alloy Electrocatalysts to Tune the Electronic Structure and Reactivity of Carbon Active Sites^†

Yang

Jiang

et al. 2021

Chin. J. Chem.

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“…Hence, different Pt SREs have been designed and synthesized (Table 2). [52,86,117,126,141,161,183,[191][192][193][194][195][196][197][198][199][200][201][202][203][204] For example, the Ru@Pt nanoparticle (Figure 17c) has a compressive Pt shell (skin) (Figure 17d), due to a smaller lattice parameter of Ru than that of Pt. [191] This SRE exhibited superior HER performance than a pure Pt foil and a RuPt alloy in both acidic and alkaline solutions.…”

Section: Hydrogen Evolution Reactionmentioning

confidence: 99%

Strain Engineering in Electrocatalysts: Fundamentals, Progress, and Perspectives

Yang

Wang

Tong

et al. 2021

Advanced Energy Materials

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sive utilization of fossil fuels. The design and development of efficient, economic, and sustainable strategies to convert clean energy (e.g., solar energy, wind energy, and hydropower energy) is thus of great significance. Among various available strategies, electrochemical energy conversion technologies have been attracted extreme attention. They mainly include (photo)electrochemical reduction of atmosphere-rich and greenhouse gas-carbon dioxideinto high value-added chemicals or liquid fuels under mild reaction conditions, electrosynthesis of NH 3 with low energy consumption to substitute the Haber method, electrochemical overall water splitting, and different kinds of fuel cells. By use of these electrochemical energy conversion technologies, it is believed that both the issues of energy shortage and environmental pollution are promising to be solved, eventually creating a globalized system with a sustainable energy circle for our society in the future (Figure 1). [1][2][3][4][5][6][7] To achieve efficient electrochemical conversion technologies, high-performance electrochemical conversion platforms need to be initialized, where electrocatalysts are frequently required. An electrocatalyst actually plays a vital role in the determination and further improvement of reaction rate, efficiency, and selectivity of different electrochemical transformations. In terms of its catalytic performance, the most crucial factors are generally considered as the amount of its active sites, the intrinsic activity of each active site, and the total efficiency of these active sites. [8] It is well-known that the amount of active sites of an electrocatalyst and its electrocatalytic efficiency can be increased through enlarging the surface area of an electrocatalyst, for example by means of synthesizing a nanostructured catalyst (e.g., nanosheets, [9] nanowires, [10] nanopores, [11][12][13] and coreshell structures [14,15] ). Meanwhile, the intrinsic activity of each catalytic site basically follows the Sabatier principle, [16][17][18][19][20] which is closely related to the ability of an electrocatalyst to weaken or strengthen the binding energies with reactants, reaction intermediates, and/or products. For example, when the free energy of hydrogen adsorption (ΔG H ) on the active sites of an electrocatalyst remains at a moderate strength, this catalyst exhibits the highest catalytic activity toward hydrogen evolution reaction (HER). In contrast, too strong or too weak ΔG H on the active sites of an electrocatalyst precludes the HER. [21][22][23] Among numerous electrocatalysts, multiple metal components based electrocatalysts have been extensively utilized in Strain engineering of nanomaterials, namely, designing, tuning, or controlling surface strains of nanomaterials is an effective strategy to achieve outstanding performance in different nanomaterials for their various applications. This article summarizes recent progress and achievements in the development of strain-rich electrocatalysts (SREs) and their applications in the fi...

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“…[ 86 ] Besides, strain regulation can effectively regulate the OER performance of IrO x ‐based catalyst. [ 87 ] The author adjusted the gradient compression strain of IrO x on IrCo by controlled electrochemical growth of IrO x atomic layer, and the length of Ir–O bond was changed, thus improving the catalytic activity. [ 88 ] Besides, DFT calculation showed that the proper compression strain effect regulates the binding force of IrO x to HOO* and ensures the best OER performance.…”

Section: Electrocatalysts For Acidic Oermentioning

confidence: 99%

Electrocatalytic acidic oxygen evolution reaction: From nanocrystals to single atoms

et al. 2021

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Hydrogen is the most preferred choice as an energy source to replace the nonrenewable energy resources such as fossil fuels due to its beneficial features of abundance, ecofriendly, and outstanding gravimetric energy density. Splitting water through a proton exchange membrane (PEM) electrolyzer is a well‐known method of hydrogen production. But the major impediment is the sluggish kinetics of oxygen evolution reaction (OER). Currently, scientists are struggling to build out an acid‐stable electrocatalyst for OER with low overpotential and excellent stability. In this review, the reaction mechanism and characterization parameters of OER are introduced, and then the improvement method of metal nanocatalysts (noble metal catalysts and noble metal‐free catalysts) in acidic media is discussed. Particularly, the application of single‐atom catalysts in acidic OER is summarized, which is current researching focus. At the same time, we also briefly introduced the cluster phenomenon, which is easy to occur in the preparation of single‐atom catalysts. More importantly, we summarized the in situ characterization methods such as in situ X‐ray absorption spectroscopy, in situ X‐ray photoelectron spectroscopy, and so forth, which are conducive to further understanding of OER reaction intermediates and active sites. Finally, we put forward some opinions on the development of acidic OER.

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Exclusive Strain Effect Boosts Overall Water Splitting in PdCu/Ir Core/Shell Nanocrystals

Cited by 186 publications

References 66 publications

MOFs‐Derived N‐Doped Carbon‐Encapsulated Metal/Alloy Electrocatalysts to Tune the Electronic Structure and Reactivity of Carbon Active Sites^†

MOFs‐Derived N‐Doped Carbon‐Encapsulated Metal/Alloy Electrocatalysts to Tune the Electronic Structure and Reactivity of Carbon Active Sites^†

Strain Engineering in Electrocatalysts: Fundamentals, Progress, and Perspectives

Electrocatalytic acidic oxygen evolution reaction: From nanocrystals to single atoms

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Exclusive Strain Effect Boosts Overall Water Splitting in PdCu/Ir Core/Shell Nanocrystals

Cited by 186 publications

References 66 publications

MOFs‐Derived N‐Doped Carbon‐Encapsulated Metal/Alloy Electrocatalysts to Tune the Electronic Structure and Reactivity of Carbon Active Sites†

MOFs‐Derived N‐Doped Carbon‐Encapsulated Metal/Alloy Electrocatalysts to Tune the Electronic Structure and Reactivity of Carbon Active Sites†

Strain Engineering in Electrocatalysts: Fundamentals, Progress, and Perspectives

Electrocatalytic acidic oxygen evolution reaction: From nanocrystals to single atoms

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Product

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MOFs‐Derived N‐Doped Carbon‐Encapsulated Metal/Alloy Electrocatalysts to Tune the Electronic Structure and Reactivity of Carbon Active Sites^†

MOFs‐Derived N‐Doped Carbon‐Encapsulated Metal/Alloy Electrocatalysts to Tune the Electronic Structure and Reactivity of Carbon Active Sites^†