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Hongyan Lu

Bio: Hongyan Lu is an academic researcher from Nanjing University. The author has contributed to research in topics: Charge density & Electrochemical cell. The author has an hindex of 2, co-authored 3 publications receiving 5 citations.

Papers
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Journal ArticleDOI
19 Mar 2021
TL;DR: In this paper, the activation free energy decreases with the amount of the oxidative charge stored at the catalyst, which gives an insight into the role of chemistry vs bias in elastic bias.
Abstract: Recent breakthrough reveals that the activation free energy decreases with the amount of the oxidative charge stored at the catalyst, which gives an insight into the role of chemistry vs bias in el...

8 citations

Journal ArticleDOI
TL;DR: In this paper, in situ observation of heterogeneous charge distribution at the Pt-graphite surface in the hydrogen evolution reaction (HER) is realized using scanning ion conductive microscopy (SICM).
Abstract: Here, in situ observation of heterogeneous charge distribution at the Pt–graphite surface in the hydrogen evolution reaction (HER) is realized using scanning ion conductive microscopy (SICM). High charge density and electrochemical activity are revealed at the Pt–graphite interface, where a high electric field is observed through theoretical derivation. This key information helps to develop a new electrochemical mechanism for the regulation of electrochemical activity, in which a locally high electric field induces more charges in these specific regions and elevated electrochemical activity.

6 citations

Journal ArticleDOI
19 Aug 2021
TL;DR: In this article, a solid PAM nanoball at the tip of a nanocapillary contacts graphene and behaves as an electrochemical cell for simultaneously measuring the morphology and electrochemical activity.
Abstract: Here, all-solid scanning electrochemical cell microscopy (SECCM) is first established by filling polyacrylamide (PAM) into nanocapillaries as a solid electrolyte. A solid PAM nanoball at the tip of a nanocapillary contacts graphene and behaves as an electrochemical cell for simultaneously measuring the morphology and electrochemical activity. Compared with liquid droplet-based SECCM, this solid nanoball is stable and does not leave any electrolyte at the contact regions, which permits accurate and continuous scanning of the surface without any intervals. Accordingly, the resolutions in the lateral (x-y) and vertical (z) directions are improved to ∼10 nm. The complete scanning of the wrinkles on graphene records low currents at the two sidewalls of the wrinkles and a relatively high current at the center of the wrinkles. The heterogeneity in the electrochemical activity of the wrinkle illustrates different electron transfer features on surfaces with varied curvatures, which is hardly observed by the current electrochemical or optical methods. The successful establishment of this high spatial electrochemical microscopy overcomes the current challenges in investigating the electrochemical activity of materials at the nanoscale, which is significant for a better understanding of electron transfer in materials.

2 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article , the authors present a high-throughput imaging technique for single-cell manipulation and measurement using SICM as an Electrochemical probe and demonstrate that it is a complementary technique to single-object electrochemistry.
Abstract: ACCESS Metrics & More Article Recommendations ■ CONTENTS High-Throughput Nanopores 320 Nanopore Working Principle 320 Arrayed Nanopore Configurations 321 Machine-Learning Assisted Nanopore Readout 321 Integration Modalities for Nanopores 321 Nanopore-Confined Electrochemistry 322 High-Throughput Scanning Ion Conductance Microscopy 324 From Nanopore to Nanoprobe 324 High-Throughput SICM 324 High-Throughput Imaging 325 High-Throughput Single-Cell Manipulation and Measurements 326 SICM as an Electrochemical Probe 326 Applications in Material Sciences 327 Applications in Life Sciences 328 High-Throughput Scanning Electrochemical Cell Microscopy 329 Technical and Theoretical Developments 329 Electrochemical Measurements and Characterization 331 Popular Redox Reactions and Electrode Materials 331 Corrosion 332 Phase Formation 332 Two-Dimensional Materials 333 Photoelectrochemistry 335 Electrocatalysis: Single Particles and PseudoSingle-Crystal Screening of Structure−Activity 336 Battery Electrode Materials 339 Optical Microscopies in Electrochemistry 339 Overview of Operational Principles 339 Operational Principles 339 Methodologies for Quantitative Image Analysis 340 Converting Local Optical Information into an Electrochemically Relevant Signal 340 Computing and Automatized Image Analysis 340 Imaging Single Events 340 A Complement to Single Nanoobject Electrochemistry 340 Electron Transfer 341 Probing Concentration Profiles 341 Conversion 341 Growth and Dissolution 342 Catalysis and Motion 342 Competing Processes 343 Electrochemistry versus Physical Transformation 343 Competing Electrochemical Reactions 344 One versus Many 344 Seeing Collective Behaviors 344 How to Access Missing Pieces of Information 344 Hyphenation with Local Complementary Information 345 Other Electrochemical and Electronic HighThroughput Imaging Techniques 345 Conclusion 346 Author Information 347 Corresponding Authors 347 Authors 347 Author Contributions 347 Notes 347 Biographies 347 Acknowledgments 348 List of Abbreviations Used 348 References 349

15 citations

Journal ArticleDOI
TL;DR: In this paper, a 3D support of three-dimensional graphite sheets (TDGS) was proposed to enhance the catalytic efficiency and stability via the molten salt method, which achieved a current density of 45 mA•cm−2 at a potential of 400mV.

13 citations

Journal ArticleDOI
TL;DR: In this article , a 3D stacked graphite sheet with edge defects was synthesized to improve the catalytic efficiency of advanced hydrogen evolution reaction (HER) catalysts, which is a measure that will potentially solve the global energy crisis.

13 citations

Journal ArticleDOI
Chen Cui1, Rong Jin1, Dechen Jiang1, Jian-Rong Zhang1, Jun-Jie Zhu1 
17 Feb 2021
TL;DR: In this article, accelerated electrochemiluminescence (ECL) reactions emitting light are visualized for the first time at the heterogeneous interfaces between microbowls and the supporting electrode surface.
Abstract: Locally enhanced electric fields produced by high-curvature structures have been reported to boost the charge transport process and improve the relevant catalytic activity. However, no visual evidence has been achieved to support this new electrochemical mechanism. Here, accelerated electrochemiluminescence (ECL) reactions emitting light are visualized for the first time at the heterogeneous interfaces between microbowls and the supporting electrode surface. The simulation result shows that the electric intensity at the interface with a high curvature is 40-fold higher than that at the planar surface. Consequently, local high electric fields concentrate reactive species to the heterogeneous interfaces and efficiently promote the charge transport reactions, which directly leads to the enhancement of ECL emission surrounding the microbowls. Additionally, the potential to induce visual ECL from a ruthenium complex drops to 0.9 V, which further illustrates the promotion of an electrochemical reaction with the aid of an enhanced electric field. This important visualization of electric field boosted electrochemical reactions helps to establish the proposed electron transfer mechanism and provide an alternative strategy to improve electrocatalytic efficiency.

12 citations

Journal ArticleDOI
TL;DR: In this paper, a high-spatial-resolution local electrochemical impedance spectroscopy (LEIS) was realized using scanning electrochemical cell microscopy (SECCM-LEIS).
Abstract: Local electrochemical impedance spectroscopy (LEIS) has been a versatile technology for characterizing local complex electrochemical processes at heterogeneous surfaces. However, further application of this technology is restricted by its poor spatial resolution. In this work, high-spatial-resolution LEIS was realized using scanning electrochemical cell microscopy (SECCM-LEIS). The spatial resolution was proven to be ∼180 nm based on experimental and simulation results. The stability and reliability of this platform were further verified by long-term tests and Kramers-Kronig transformation. With this technology, larger electric double-layer capacitance (Cdl) and smaller interfacial resistance (Rt) were observed at the edges of N-doped reduced graphene oxide, as compared to those at the planar surface, which may be due to the high electrochemical activity at the edges. The established SECCM-LEIS provides a high-spatial approach for study of the interfacial electrochemical behavior of materials, which can contribute to the elucidation of the electrochemical reaction mechanism at material surfaces.

9 citations