Peng Wang

Peng Wang
Nanjing University | NJU · Department of Materials Science & Engineering

PhD

About

225
Publications
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Introduction
Hi, I’m Peng Wang (王鹏), a Professor running a Sub-atomic Resolution Electron Microscopy Laboratory at Nanjing University (NJU,南京大学), China. My research interests have been in the applications of aberration corrected scanning transmission electron microscopy (STEM) imaging and electron energy loss spectroscopy to characterize functional and energy materials at nano and atomic scales from two to three dimensions. My current work is focused on advancing a super-resolution coherent diffractive imaging technique, namely Ptychography and also characterizing oxide interfaces and surfaces. I am a member of Institute of Physics (MInstP), Youth Committee of Chinese Materials Research Society (CMRS), Chinese Electron Microscopy Society (CEMS). Home Page: www.wangstem.com

Publications

Publications (225)
Article
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Lithium–sulfur (Li–S) battery is considered as an appealing candidate for next‐generation electrochemical energy storage systems because of high energy and low cost. Nonetheless, its development is plagued by the severe polysulfide shuttling and sluggish reaction kinetics. Although single‐atom catalyst (SAC) has emerged as a promising remedy to exp...
Article
Self-assembly processes, while promising for enabling the fabrication of complexly organized nanomaterials from nanoparticles, are often limited in creating structures with multiscale order. These limitations are due to difficulties in practically realizing the assembly processes required to achieve such complex organizations. For a long time, a hi...
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Lithium‐rich, manganese‐based layered oxides are considered one of the most valuable cathode materials for the next generation of high‐energy density lithium‐ion batteries (LIBs) for their high specific capacity and low cost. However, their practical implementation in LIBs is hindered by the rapid voltage/capacity decay on cycling and the long‐stan...
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The capability to finely tailor material thickness with simultaneous atomic precision and non-invasivity would be useful for constructing quantum platforms and post-Moore microelectronics. However, it remains challenging to attain synchronized controls over tailoring selectivity and precision. Here we report a protocol that allows for non-invasive...
Article
A one-pot and energy-saving method was developed to manufacture defective manganese oxide materials. The insertion of zinc ions improves manganese oxide conductivity results in a significant increase in number of defects in the lattice to provide abundant active sites for energy storage. The synthesized zinc doped manganese oxide achieved a maximum...
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Construction of single-atom catalysts (SACs) with maximally exposed active sites remains a challenging task mainly because of the lack of suitable host matrices. In this study, hierarchical N-doped carbon nanoboxes composed of ultrathin nanosheets with dispersed atomic Mo (denoted as hierarchical SA-Mo-C nanoboxes) were fabricated via a template-en...
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Anionic redox and cationic redox chemistries enable Li-rich layered oxides to achieve ultrahigh specific capacities. Unfortunately, the irreversible nature of anionic redox participated by lattice oxygen causes the irreversible release of oxygen, leading to severe structural degradation and side reactions, which causes capacity/voltage fading. Here...
Article
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Birnessite MnO2 is a promising cathode material for aqueous Mg-ion batteries due to its layered structure with large interlayer distance. However, the two-dimensional growth mode of birnessite induces nanosheet morphology with preferred growth of inactive (001) planes with sluggish ion transport kinetics. In this work, a high Mg content birnessite...
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Fabrication of single-crystalline metal-organic framework (MOF) hollow nanostructures with two-dimensional (2D) morphologies is a challenging task. Herein, twin-like MOF nanobricks, a quasi-hollow 2D architecture, with multi-metal nodes and replaceable organic ligands, are uniformly and firmly grown on conductive Ni foam through a generic one-pot a...
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Layered sodium transition metal (TM) oxides exhibit great potential as high energy density cathode materials for sodium-ion batteries (SIBs). The large Na ions, nevertheless, adopts various coordination environments that are dependent of the sodium concentration, giving rise to cyclical gliding of TM layers and P-O phase transitions upon Na extract...
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Controlled generation of reactive oxygen species (ROS) is essential in biological, chemical, and environmental fields, and piezoelectric catalysis is an emerging method to generate ROS, especially in sonodynamic therapy due to its high tissue penetrability, directed orientation, and ability to trigger in situ ROS generation. However, due to the low...
Preprint
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Single atom catalysts have received widespread attention for their fascinating performance in terms of metal atom efficiency as well as their unique catalysis mechanisms comparing to conventional catalysts. Here, we prepared a high-performance catalyst of single-Cu-atom-decorated boron nitride nanofibers (BNNF-Cu) via a facile calcination method fo...
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The strategy of constructing the core/shell structure is of great importance in emitting semiconductor nanocrystals. However, the coating on soft metal halide perovskite nanocrystals at the single particle level remains a challenge because of the low compatibility between perovskites and common wide-band-gap semiconductors, such as ZnS and CdS. In...
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DNA origami technology has proven to be an excellent tool for precisely manipulating molecules and colloidal elements in a three-dimensional manner. However, fabrication of single crystals with well-defined facets from highly programmable, complex DNA origami units is a great challenge. Here, we report the successful fabrication of DNA origami sing...
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Carbon catalysts with trnsition metal atoms anchored via nitrogen coordination have emerged as promising alternatives to Pt in catalyzing oxygen reduction reaction (ORR). However, the intangible evolution of structure in popular synthetic routes containing pyrolysis leads to discrete and irregular M-Nx sites, resulting in limited descriptors and th...
Preprint
Electron-boson interaction is fundamental to a thorough understanding of various exotic properties emerging in many-body physics. In photoemission spectroscopy, photoelectron emission due to photon absorption would trigger diverse collective excitations in solids, including the emergence of phonons, magnons, electron-hole pairs, and plasmons, which...
Article
Based on the redox couple reaction of Mn³⁺/Mn⁴⁺, the theoretical capacitance of manganese dioxide (MnO2) has a very high value of 1370 F/g but the specific capacitance of MnO2 in the reported literature is still under 300 F/g. The potential window of MnO2 in the previously published studies is approximately 1 V which, considering E = ½CV², limits t...
Article
Electron-boson interaction is fundamental to a thorough understanding of various exotic properties emerging in many-body physics. In photoemission spectroscopy, photoelectron emission due to photon absorption would trigger diverse collective excitations in solids, including the emergence of phonons, magnons, electron-hole pairs, and plasmons, which...
Article
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Low Dose Electron Ptychography for Cryo-Biological Imaging - Liqi Zhou, Jingdong Song, Judy Kim, Xudong Pei, Chen Huang, Xiaoqing Pan, Peter Nellist, Peijun Zhang, Angus Kirkland, Peng Wang
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Anomalous Linear Layer-Dependent Blue Shift of Interband Transition in Two-Dimensional Materials - Xingxu Yan, Feng Xue, Chaitanya Gadre, Zhe Wang, Ruqian Wu, Peng Wang, Xiaoqing Pan
Article
HfOx-based resistive random access memories have shown great potential in next-generation non-volatile memories, but they are not optimized as synaptic devices for neuromorphic systems. In this paper, the fabrication and biological synaptic behavior of HfO2/HfOx bilayer ultrathin memory devices are studied. 4-nm non-stoichiometric HfOx films were p...
Article
Here, we report a high-performance catalyst [email protected], prepared via a unique method to embed 2∼5 nm Cu nanoparticles in crystalline particles of Na-Beta zeolite, for CO2 hydrogenation to ethanol as the only organic product in a traditional fixed-bed reactor. The ethanol yield in a single pass can reach ∼14% at 300°C, ∼12,000 mL·gcat⁻¹·h⁻¹,...
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Cryo-electron microscopy is an essential tool for high-resolution structural studies of biological systems. This method relies on the use of phase contrast imaging at high defocus to improve information transfer at low spatial frequencies at the expense of higher spatial frequencies. Here we demonstrate that electron ptychography can recover the ph...
Article
In this work, we propose a flexible ferroelectric tunnel junction (FTJ) with a nanometer-thick single-crystalline BaTiO3 barrier prepared by exfoliating and transferring epitaxial BaTiO3 thin films onto flexible poly(styrenesulfonate)-doped poly(3,4-ethylenedioxythiophene) (PEDOT:PSS) conductive electrodes using a water-soluble Sr3Al2O6 sacrificial...
Article
High-efficiency non-precious electrocatalysts are urgently demanded in hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Transition metal oxides catalysts have shown high activity for the OER in alkaline medium, however, they are generally inactive for HER. Here, we report an aliovalent fluorine anion substitution and anodizati...
Article
The epitaxial crystal quality of strontium aluminate (Sr3Al2O6) films under various Sr/Al ratios were systematically investigated by reactive molecular beam epitaxy. Efficient guiding rules for real-time optimization are summarized that a four-fold reconstructed reflection high-energy electron diffraction (RHEED) pattern and 4 periods of RHEED osci...
Article
Perovskite and chalcogenide quantum dots (QDs) are important nano semiconductors. It has been a challenge to synthesize heterostructural QDs combining perovskite and chalcogenide with tailorable photoelectronic properties. In this report, heterostructural CsPbX3-PbS (X=Cl, Br, I) QDs were successfully synthesized via a room temperature in-situ tran...
Article
The reversible anion redox of O²⁻/(O2)ⁿ⁻ in 3d-transition-metal based Li layered oxides (LLO) has received renewed attention due to its capability of hosting additional redox centers, which can further improve the energy density of Li-ion batteries. However, over-oxidized (O2)ⁿ⁻ was found to be unstable upon cycling, resulting in an irreversible cr...
Article
Programmable assembly of nanoparticles towards well‐defined architectures has attracted much attention due to their tailored properties resulted from coupling effects. However, ways to develop general and precise approaches to control the binding modes between nanoparticles (NPs) when fabricating designed architectures remain a significant challeng...
Article
Programmable assembly of nanoparticles towards well‐defined architectures has attracted much attention due to their tailored properties resulted from coupling effects. However, ways to develop general and precise approaches to control the binding modes between nanoparticles (NPs) when fabricating designed architectures remain a significant challeng...
Article
Lanthanum titanate, LaTiO3, is an antiferromagnetic Mott insulator with a Ti 3d¹ electronic configuration and exhibits an intriguing metallic state in its epitaxial film grown on the SrTiO3 substrate. Here, we explore the driving force of the Mott insulator to metal transition in LaTiO3 epitaxial films by a systematic study of the film growth condi...
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The unique electronic structure of two-dimensional materials paves the way for abundant cutting-edge applications, including electronic devices and optoelectronic devices. The band gap excitations are nonlinearly red-shifted with increasing layer number, leading to intriguing tunable photon response in visible light range. However, there is a lack...
Article
Li-substituted, manganese-based, layered oxides Na x Li0.18Mn0.66Co0.17Ni0.17O2+δ (x = 0.54, 0.66, 0.78, and 0.90) have been investigated as one kind of high-performance cathode materials for sodium ion batteries (SIBs). Phase compositions and local structures of the cathode materials with varying sodium content were elucidated by powder X-ray diff...
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Single-site catalysts feature high catalytic activity but their facile construction and durable utilization are highly challenging. Herein, we report a simple impregnation-adsorption method to construct platinum single-site catalysts by synergic micropore trapping and nitrogen anchoring on hierarchical nitrogen-doped carbon nanocages. The optimal c...
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Two‐dimensional (2D) anisotropic rhenium diselenide (ReSe2) has attracted lots of attention due to its promising applications in electronics and optoelectronics. However, controlled synthesis of high quality ultrathin ReSe2 remains as a challenge. Here we developed an approach for synthesizing high quality 2D ReSe2 flakes with a thickness down to m...
Article
Although palladium-gold (PdAu) bimetals have been extensively investigated as oxygen reduction reaction (ORR) electrocatalysts, the comprehensive mechanism studies on the strain and electronic effect are in their infancy. Herein, the strain effect and surface composition of PdAu hollow nanospheres (PdAu HSs) can be tuned by Pd-to-Au ratio. The opti...
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Hollow structure has attracted great attentions based on the advantage to accommodate volume expansion. However, template removal usually results in structure destruction. Herein, dandelion-like Mn/Ni co-doped CoO/C hollow microspheres (CMNC-10h) are synthesized via Ostwald ripening process without templates. The high angle annular dark field (HAAD...
Article
Ni-rich layered oxide cathodes have received extensive attention because of their high specific capacities and cost-effectiveness resulting from a reduction in Co usage. However, Ni-rich layered oxide still suffer from the challenge of limited rate capability, capacity/voltage fading and safety issues that are mainly induced by significant Li/Ni ca...
Article
BiFeO3-BaTiO3 (BFBT) is a promising high temperature piezoelectric ceramic system, as it possesses both high electromechanical properties and high Curie temperature. However, pure BFBT commonly exhibits large electrical conductivity at high temperatures, and there is considerable disagreement on its electrical conduction mechanism. Here we investig...
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Electron ptychography using an ultrafast direct electron detector - Volume 25 Supplement - Biying Song, Zhiyuan Ding, Christopher Allen, Hidetaka Sawada, Xiaoqing Pan, Angus I. Kirkland, Peng Wang
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Developing Multifunctional and High Resolution In-situ TEM Holders - Volume 25 Supplement - Songhua Cai, Mingjie Xu, Sheng Dai, Peng Wang, Xiaoqing Pan
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3D Electron Ptychography - Volume 25 Supplement - Si Gao, Zhiyuan Ding, Xiaoqing Pan, Angus I. Kirkland, Peng Wang
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To improve the energy and power density of Na‐ion batteries, an increasing number of researchers have focused their attention on activation of the anionic redox process. Although several materials have been proposed, few studies have focused on the Na‐rich materials compared with Li‐rich materials. A key aspect is sufficient utilization of anionic...
Article
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A facile strategy is proposed to synthesize monodispersed Pt3Ni nanoparticles. Such a kind of electrocatalyst shows a larger electrochemical surface area (98.9 m2 gpt−1) and double the mass activity of the oxygen reduction reaction activity compared to commercial Pt/C catalyst. The results show that the suitable addition of Ni and triethylamine in...
Article
The electrochemical properties of layered cathodes could be enhanced by doping aluminium. However, the underlying mechanism of Al-ions behaviour is deficient, which obstructs further application. Herein, by adjusting the aluminium content in the model LiNi0.85-xCo0.15AlxO2 (LNCA) materials, the samples with optimum aluminium content (x=0.05) exhibi...
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Two-dimensional (2D) materials such as graphene and transition-metal dichalcogenides reveal the electronic phases that emerge when a bulk crystal is reduced to a monolayer1–4. Transition-metal oxide perovskites host a variety of correlated electronic phases5–12, so similar behaviour in monolayer materials based on transition-metal oxide perovskites...
Article
Ternary transition metal oxides (TMOs) are highly potential electrode materials for lithium ion batteries (LIBs) due to abundant defects and synergistic effects with various metal elements in a single structure. However, low electronic/ionic conductivity and severe volume change hamper their practical application for lithium storage. Herein, nanosh...
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Benefiting from abundant redox chemistry and high electrochemical properties, metal sulfides have been broadly employed as electrode materials in supercapacitor systems. However, the predominant limitation in their performance, which arises from indifferent electron and ion dynamics for transportation and a rapid slash in capacitance, is of particu...
Article
Na‐ion batteries are promising for large‐scale energy storage due to the low cost and earth abundance of the sodium resource. Despite tremendous efforts being made to improve the battery performance, some fundamental mechanism issues still are not sufficiently understood. One such issue in the most popularized layered structure materials is the pot...
Article
Mn 2 O 3 /C hybrids with almond-like, peach-like and peanut-like morphologies are fabricated via hydrothermal method followed by annealing in air at ambient pressure. Their physical properties and morphologies are characterized by X-ray diffraction (XRD), Raman scattering spectroscopy (Raman), X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett...
Article
La0.7Sr0.3VO3 (LSVO) thin films, 5-30 unit cells (u.c.) in thickness, have been epitaxially deposited on (0 0 1) SrTiO3 (STO) single crystal substrates. Although LSVO is metallic in bulk, insulating behavior is observed, from 2 to 390 K, in LSVO films less than 9 u.c. in thickness, while thicker films show a metal-insulator transition with the crit...
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Electron ptychography has recently attracted considerable interest for high resolution phase-sensitive imaging. However, to date studies have been mainly limited to radiation resistant samples as the electron dose required to record a ptychographic dataset is too high for use with beam-sensitive materials. Here we report defocused electron ptychogr...
Article
Aqueous rechargeable batteries with advantages of safety, low cost, and environmental kindness have displayed high feasibility of practical application for large-scale energy storage. Developing high-performance electrode materials is a necessary gateway to commercially available batteries. Here, we demonstrate the controlled synthesis of sodium ir...
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Bronze phase titanium dioxide (TiO2-B) has an ideal open structure for applications in high-rate lithium-ion batteries, but high quality and water-free TiO2-B is difficult to synthesize since TiO2-B is energetically less stable compared to other TiO2 polymorphs. Using CaTi5O11 as a template layer can help stabilize TiO2-B phase, but it is still cha...
Article
Recently, transition metal oxides have caused great attention as anode materials for lithium-ion batteries based on the high theoretical capacities. However, the poor electrical conductivity, unstable cycling performance and unclear additional capacity are still great challenges. Herein, the CoxMnyNizO (x:y:z=8:0.92:0.71) nanosheets corresponding t...
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A peroxidase catalyzes the oxidation of a substrate with a peroxide. The search for peroxidase-like and other enzyme-like nanomaterials (called nanozymes) mainly relies on trial-and-error strategies, due to the lack of predictive descriptors. To fill this gap, here we investigate the occupancy of eg orbitals as a possible descriptor for the peroxid...