Nanoscale kinetics of asymmetrical corrosion in core-shell nanoparticles

Hao, Shuai; Gao, Wenpei; Xiong, Yanyan; Shi, Fenglei; Yan, Yi‐Ming; Ma, Yanling; Shang, Wen; Tao, Peng; Song, Chengyi; Deng, Tao; Zhang, Hui; Yang, Deren; Pan, Xiaoqing; Wu, Jianbo

doi:10.1038/s41467-018-03372-z

Cited by 99 publications

(100 citation statements)

References 70 publications

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“…The NiS/C-600 possesses a core-shell structure with a porous NiS core and a 30 nm carbon shell as confirmed by the TEM and high-angle annular dark field (HAADF) image ( Figure 2c and Figure S2c, Supporting Information). [28] The high-resolution TEM (HRTEM) images in Figure 2 show that the lattice fringes d-spacing of each sample match well with the XRD pattern. Both the SEM and TEM images show distinct yolk-shell NiS x @C microboxes with an obvious void space between the core and shell (Figure 2d and Figure S2d, Supporting Information).…”

Section: Nismentioning

confidence: 55%

Silica Restricting the Sulfur Volatilization of Nickel Sulfide for High‐Performance Lithium‐Ion Batteries

et al. 2019

Advanced Energy Materials

104

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are important factors. More efforts are required to develop low-cost and efficient electrode materials. [4,5] As an important part of battery components, anode materials have been one of the most critical and extensively studied aspects in electrochemical research. [6][7][8][9][10] Among the many anode materials, transition metal-based compounds are characterized as a promising species due to their abundant reserves and multiple valence nature. Having more electrons involved in electrochemical reactions can provide higher capacity that meet the energy density requirements of modern electrochemical storage devices. [11,12] In this regard, many efforts have been made to discover new transition metal-based anode materials such as carbides, oxides, phosphides, or sulfides. [13][14][15] Due to its abundance and low prices, mineral-type nickel sulfide has gained much attention in photo-electrochemistry and is widely used in semiconductor, magnetic, photo-electrocatalytic, thermoelectric, phase-converting materials, and electrode materials for rechargeable lithium-ion batteries. [16][17][18][19][20] In prior research, the numerous nickel sulfides applied in rechargeable lithiumion batteries (NiS, NiS 2 , Ni 3 S 2 , and Ni 3 S 4 ) have all possessed high theoretical capacities (NiS/589, NiS 2 /870, Ni 3 S 2 /445, and Ni 3 S 4 /703 mAh g −1 ). [20] However, nickel sulfides are seldom regarded as excellent candidates for lithium-ion batteries, mainly due to the instability in the nickel-rich active material. As a result, during lithiation and delithiation the active materials tend to be more susceptible to pulverization and collapse, making it difficult to form a stable interface. The everexpanding interface area between active materials and electrolyte will continuously consume Li + to form the solid electrolyte interface (SEI), resulting in low coulombic efficiency. Meanwhile, the electrically insulated SEI layer will wrap the active materials to form "inactive island" which results in rapid capacity decay and poor cycle performance. [21,22] Numerous strategies have been developed to address this issue, such as controlling cutoff voltage, [20] constructing nanomaterials, [21] and compositing with graphene. [23,24] However, despite extensive research efforts, improving the performance of nickel sulfide to achieve high specific capacity and long cycle life is still a challenge. [21,25,26] Herein, a step-divided construction method was developed successfully to synthesize the NiS x @carbon (NiS x @C) yolk-shell microboxes via a template-assisted coating, thermal Nickel sulfides are regarded as promising anode materials for advanced rechargeable lithium-ion batteries due to their high theoretical capacity. However, capacity fade arising from significant volume changes during operation greatly limits their practical applications. Herein, confined NiS x @C yolk-shell microboxes are constructed to address volume changes and confine the active material in the internal void space. Having benefited from the yolk-shell structure de...

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Section: Nismentioning

confidence: 55%

Silica Restricting the Sulfur Volatilization of Nickel Sulfide for High‐Performance Lithium‐Ion Batteries

et al. 2019

Advanced Energy Materials

104

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“…The main advantages of such a design over monometallic catalysts are enhanced SA, a drastic decrease in noble metal loading and significant cost benefits . Critically for these materials, the main challenge lies in the stability of the non‐noble material that supports the noble metal layer . State‐of‐the‐art Pt‐based alloys and intermetallic phases with 3d transition metals (TM) such as Pt 3 Ni, Pt 3 Co or Pt 3 Cu equally develop a core‐shell structure during operation until a closed Pt‐film protects the particle interior from dissolution.…”

Section: Introductionmentioning

confidence: 99%

“…Given that non‐protected, non‐noble alloy elements such as Ni, Co or Cu dissolve quantitatively under fuel cell operating conditions, noble metal contents of up to 80 at% are often employed . Metal leaching results in extensive losses in the overall catalytic activity and poisoning of the proton conducting membrane, constraining the broad usage of core‐shell structures with earth abundant elements . New material combinations are ardently needed to reduce the total noble metal content and suppress non‐noble element dissolution while keeping the specific and mass activity high.…”

Section: Introductionmentioning

confidence: 99%

Stable and Active Oxygen Reduction Catalysts with Reduced Noble Metal Loadings through Potential Triggered Support Passivation

et al. 2020

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The development of stable, cost‐efficient and active materials is one of the main challenges in catalysis. The utilization of platinum in the electroreduction of oxygen is a salient example where the development of new material combinations has led to a drastic increase in specific activity compared to bare platinum. These material classes comprise nanostructured thin films, platinum alloys, shape‐controlled nanostructures and core–shell architectures. Excessive platinum substitution, however, leads to structural and catalytic instabilities. Herein, we introduce a catalyst concept that comprises the use of an atomically thin platinum film deposited on a potential‐triggered passivating support. The model catalyst exhibits an equal specific activity with higher atom utilization compared to bulk platinum. By using potential‐triggered passivation of titanium carbide, irregularities in the Pt film heal out via the formation of insoluble oxide species at the solid/liquid interface. The adaptation of the described catalyst design to the nanoscale and to high‐surface‐area structures highlight the potential for stable, passivating catalyst systems for various electrocatalytic reactions such as the oxygen reduction reaction.

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“…Such in situ observation techniques have been extensively applied to nucleation and growth of nanomaterials and selective etching. For example, Wu and co‐workers successfully applied liquid cell TEM for capture the etching process of Pd@Pt core–shell nanomaterials and the formation of Pt cages . Two different and simultaneous competing etching pathways, galvanic etching and halogen etching, are identified to responsible for the corrosion and structural evolution of the final products.…”

Section: Controllable Synthesis Of 1d Hollow Alloy Nanotubesmentioning

confidence: 99%

Recent Advances on Controlled Synthesis and Engineering of Hollow Alloyed Nanotubes for Electrocatalysis

2019

Advanced Materials

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The past decade has witnessed great progress in the synthesis and electrocatalytic applications of 1D hollow alloy nanotubes with controllable compositions and fine structures. Hollow nanotubes have been explored as promising electrocatalysts in the fuel cell reactions due to their well‐controlled surface structure, size, porosity, and compositions. In addition, owing to the self‐supporting ability of 1D structure, hollow nanotubes are capable of avoiding catalyst aggregation and carbon corrosion during the catalytic process, which are two other issues for the widely investigated carbon‐supported nanoparticle catalysts. It is currently a great challenge to achieve high activity and stability at a relatively low cost to realize commercialization of these catalysts. An overview of the structural and compositional properties of 1D hollow alloy nanotubes, which provide a large number of accessible active sites, void spaces for electrolytes/reactants impregnation, and structural stability for suppressing aggregation, is presented. The latest advances on several strategies such as hard template and self‐templating methods for controllable synthesis of hollow alloyed nanotubes with controllable structures and compositions are then summarized. Benefiting from the advantages of the unique properties and facile synthesis approaches, the capability of 1D hollow nanotubes is then highlighted by discussing examples of their applications in fuel‐cell‐related electrocatalysis. Finally, the remaining challenges and potential solutions in the field are summarized to provide some useful clues for the future development of 1D hollow alloy nanotube materials.

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Nanoscale kinetics of asymmetrical corrosion in core-shell nanoparticles

Cited by 99 publications

References 70 publications

Silica Restricting the Sulfur Volatilization of Nickel Sulfide for High‐Performance Lithium‐Ion Batteries

Silica Restricting the Sulfur Volatilization of Nickel Sulfide for High‐Performance Lithium‐Ion Batteries

Stable and Active Oxygen Reduction Catalysts with Reduced Noble Metal Loadings through Potential Triggered Support Passivation

Recent Advances on Controlled Synthesis and Engineering of Hollow Alloyed Nanotubes for Electrocatalysis

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