Design of nanocatalyst for electrode structure: Electrophoretic deposition of iron phosphide nanoparticles to produce a highly active hydrogen evolution reaction catalyst

Park, Yoonsu; Kim, Ho-Young; Lee, Taegyeom; Hong, Yun‐Kun; Jeong, Wooseok; Kim, Soo-Kil; Ha, Don‐Hyung

doi:10.1016/j.cej.2021.133217

Cited by 25 publications

(9 citation statements)

References 62 publications

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“…The smaller Tafel slopes of the Co‐ and Ni‐1.5 h‐MoP samples also demonstrate superior catalytic activities compared to that of the MoP sample, suggesting that a higher reaction rate can be obtained by the post‐synthetic method. The Tafel slopes of MoP and the M‐incorporated MoP NPs suggest that the rate‐determining step involves the Volmer‐Heyrovsky mixed mechanism, regardless of the cation addition reaction, which is a typical mechanism for MoP‐based electrocatalysts 34,50,52,53 . The charge‐transfer rate during the HER was investigated by EIS performed at a potential where current density reached 10 mA cm −2 , Nyquist plots for which are shown in Figures 3E and S10a.…”

Section: Resultsmentioning

confidence: 99%

“…The Tafel slopes of MoP and the M-incorporated MoP NPs suggest that the rate-determining step involves the Volmer-Heyrovsky mixed mechanism, regardless of the cation addition reaction, which is a typical mechanism for MoP-based electrocatalysts. 34,50,52,53 The charge-transfer rate during the HER was investigated by EIS performed at a potential where current density reached 10 mA cm À2 , Nyquist plots for which are shown in Figures 3E and S10a. The Nyquist plots were fitted using a well-established equivalent circuit (the Randles circuit) consisting of a series resistor and a parallel circuit, where R s is the sum of the ohmic resistance, which is mainly due to electrolyte resistance, and R ct and the constant phase element (CPE) represent charge transfer resistance and double-layer capacitance, respectively, at the catalyst/electrolyte interface.…”

Section: Resultsmentioning

confidence: 99%

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Transition‐metal‐incorporated molybdenum phosphide nanocatalysts synthesized through post‐synthetic transformation for the hydrogen evolution reaction

Kim

Park

Lee

et al. 2022

Intl J of Energy Research

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Summary Post‐synthetic chemical transformation is a recently emerging nanomaterial manufacturing method for obtaining materials with precisely modulated properties. Through post‐synthetic transformation methods, foreign elements are exchanged or incorporated into presynthesized nanoparticles (NPs). However, metal phosphides have not been primarily used as starting materials because of their strong bonding characteristics. In this study, we synthesized bimetallic transition metal phosphide (TMP) NPs through a cation addition reaction using amorphous molybdenum phosphide (MoP) as the starting material, which is a promising catalyst for the hydrogen evolution reaction (HER). The additional metal elements, namely Co and Ni, were successfully incorporated into the parent MoP NPs, which led to only marginal changes in size or shape, even after 12 hours of reaction. Because morphological factors strongly influence catalytic activity, nanocatalysts with identical morphologies provide a direct comparison among NPs with various chemical properties. The Co‐ and Ni‐incorporated MoP NPs exhibited significantly enhanced catalytic activities for the HER, with similar electrochemically active surface areas. In particular, Co‐1.5 h‐MoP showed the highest HER activity (167 mV at −10 mA cm−2) and durability among the samples in 0.5 M H2SO4. Such an improvement in catalytic activity through the cation addition reaction may be ascribed to the difference in the electronegativities of the original and newly added metal cations, as confirmed by X‐ray photoelectron spectroscopy (XPS), resulting in abundant metal‐P bonding and oxidation resistivity. This study provides a new advanced platform for directly analyzing the inherent characteristics of nanomaterials for diverse applications, especially electrocatalysis.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Transition‐metal‐incorporated molybdenum phosphide nanocatalysts synthesized through post‐synthetic transformation for the hydrogen evolution reaction

Kim

Park

Lee

et al. 2022

Intl J of Energy Research

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“…The moving species for EPD are solid particles, and they can be easily adapted to various materials such as metals, ceramics, polymers, and biomolecules; furthermore, they can be selected as a target particle without any chemical reaction on the substrate/NP interface . The advantages of EPD include strong adherence between the particles and the conductive substrate with a high density coating, applicability over a wide range of substrate shapes, possibility of the selective deposition of particles for the desired area, no vacuum process, and no high temperature requirement, which are difficult to achieve using other conventional manufacturing methods. , Nanostructured films fabricated through EPD have been widely applied to various applications such as water-splitting electrocatalysts, quantum dot light-emitting diodes, battery electrodes, solar cells, and screen panels; they show enhanced performances compared to those of the devices fabricated using traditional techniques.…”

Section: Introductionmentioning

confidence: 99%

Contact Enhancement in Nanoparticle Assemblies through Electrophoretic Deposition

et al. 2022

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A strong interparticle connection needs to be realized to harvest unique nanoscale features of colloidal nanoparticles (NPs) in film structures. Constructing a strong contact and adhesion of NPs on a substrate is an essential process for improved NP film properties, and therefore, its key factors should be determined by understanding the NP deposition mechanism. Herein, we investigated the critical factors leading to the robust and strong adherence of the film structure and revealed that the NP deposition mechanism involved the role of surfactant ligands during electrophoretic deposition (EPD). The high amount of surfactant ligand treatment results in a high deposition rate of NPs in the early stage; however, the ligand treatment does not influence the deposition rate in the later stage. Furthermore, the deposition mechanism is found to involve three steps during EPD: island formation, lateral growth, and layer-by-layer deposition. Rapid NP deposition kinetics controlled by ligand treatments demonstrate the strong contact and adhesion of NP film structures; they are characterized by the fast charge transfer, low resistivity, and rigid NP layers of the Cu 2−x S NP-based devices. Finally, the controlled role of surfactant ligands in EPD enables design of high-performance nanostructured NP film devices with contact enhancement.

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“…Zinc sulfide (ZnS) NPs, widely used for high-performance applications, − were employed for in situ analysis and intentionally aggregated in hexane through additional washing, facilitating the observation of aggregates in macroscale with visible light (Figure S1). Inducing NP aggregation by injecting a polar solvent can construct the colloidal NP thin film for various applications by controlling the deposition kinetics, , meaning that understanding a relationship between deposition and NP aggregation is essential. The synthesized ZnS aggregates exhibited a positively charged state, confirmed by ζ potential analysis (Figure S1e).…”

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confidence: 99%

“…10−12 An alternative, electrophoretic deposition (EPD), mitigates such disadvantages by creating desirable products using an electric field, affording advantages such as strong interparticle coupling, 13 improved electrical conductivity, 14 and various applicable materials and/or shapes. 15,16 Accordingly, a NP thin film fabricated by EPD is usually employed for various applications, 5,6,11,17 so investigating the mechanism behind EPD is essential to further enhance the performance.…”

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confidence: 99%

How Do Colloidal Nanoparticles Move in a Solution under an Electric Field?: In Situ Light Scattering Analysis

Jeong

Park

Hong

et al. 2023

J. Phys. Chem. Lett.

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Understanding the dynamics of colloidal nanoparticles (NPs) in a solution is the key to assembling them into solids through a solution process such as electrophoretic deposition. In this study, newly developed in situ analysis with light scattering is used to examine NP dynamics induced by a non-uniform electric field. We reveal that the symmetric directions of moving NP aggregates are due to dielectrophoresis between the cylindrical electrodes, while the actual NP deposition is based on the charge of NPs (electrophoresis). Over time, the symmetry of the dynamics becomes less evident, inducing feeble deposition as the less-ordered dynamics become stronger. Eventually, two separate deposition mechanisms emerge as the deposition rate decreases with the change in the NP dynamics. Furthermore, we identify the vortex-like NP motion between the electrodes. These in situ analyses provide insights into the electrophoretic deposition mechanism and NP behavior in a solution under an electric field for fine film construction.

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Design of nanocatalyst for electrode structure: Electrophoretic deposition of iron phosphide nanoparticles to produce a highly active hydrogen evolution reaction catalyst

Cited by 25 publications

References 62 publications

Transition‐metal‐incorporated molybdenum phosphide nanocatalysts synthesized through post‐synthetic transformation for the hydrogen evolution reaction

Transition‐metal‐incorporated molybdenum phosphide nanocatalysts synthesized through post‐synthetic transformation for the hydrogen evolution reaction

Contact Enhancement in Nanoparticle Assemblies through Electrophoretic Deposition

How Do Colloidal Nanoparticles Move in a Solution under an Electric Field?: In Situ Light Scattering Analysis

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