Weijun Zhou

City University of Hong Kong

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Jizhang Chen

Nanjing Forestry University

Minfeng Chen

Nanjing Forestry University

Qinghua Tian

Zhejiang Sci-Tech University

Xiang Han

Nanjing Forestry University

Junling Xu

Guangdong University of Technology

Xinwu Xu

Nanjing Forestry University

Ching‐Ping Wong

Georgia Institute of Technology

Aixiang Huang

Nanjing Forestry University

Yuhui Quan

Nanjing Forestry University

Shaojun Dong

Hefei National Center for Physical Sciences at Nanoscale

Cooperative Institutions

Chinese Academy of Sciences

University of Chinese Academy of Sciences

Dow Chemical (United States)

Nanjing Forestry University

California Institute of Technology

University of Science and Technology of China

Peking University

University of Illinois Urbana-Champaign

Changchun Institute of Applied Chemistry

University of Hong Kong

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Diffractive Spectral-Splitting Optical Element Designed by Adjoint-Based Electromagnetic Optimization and Fabricated by Femtosecond 3D Direct Laser Writing

ACS Photonics (2016)

T. Patrick Xiao Osman S. Cifci Samarth Bhargava Hao Chen Timo Gissibl

The greatest source of loss in conventional single-junction photovoltaic cells is their inefficient utilization of the energy contained in the full spectrum of sunlight. To overcome this deficiency, we propose a multijunction system that laterally splits the solar spectrum onto a planar array of single-junction cells with different band gaps. As a first demonstration, we designed, fabricated, and characterized dispersive diffractive optics that spatially separated the visible (360–760 nm) and near-infrared (760–1100 nm) bands of sunlight in the far field. Inverse electromagnetic design was used to optimize the surface texture of the thin diffractive phase element. An optimized thin film fabricated by femtosecond two-photon absorption 3D direct laser writing shows an average splitting ratio of 69.5% between the visible and near-infrared light over the 380–970 nm range at normal incidence. The splitting efficiency is predicted to be 80.4% assuming a structure without fabrication errors. Spectral-splitting action is observed within an angular range of ±1° from normal incidence. Further design optimization and fabrication improvements can increase the splitting efficiency under direct sunlight, increase the tolerance to angular errors, allow for a more compact geometry, and ultimately incorporate a greater number of photovoltaic band gaps.

10.1021/acsphotonics.6b00066

Cite

Citations (68)

Hybridizing δ-Type MnO2 With Lignin-Derived Porous Carbon as a Stable Cathode Material for Aqueous Zn–MnO2 Batteries

Frontiers in Energy Research (2020)

Weijun Zhou Anran Wang Aixiang Huang Minfeng Chen Qinghua Tian

With the advantages of intrinsic safety, low price, high output potential, and acceptable energy density, aqueous rechargeable Zn-MnO2 batteries are gradually emerging as promising energy storage devices in recent years. Unfortunately, the structural instability and poor electrical conductivity of manganese dioxides still hinder their further applications. To tackle these issues, we demonstrate a high-performance cathode material for Zn-MnO2 batteries by hybridizing lignin-derived porous carbon with δ-MnO2 (denoted as LPC/δ-MnO2). Benefiting from the high electrical conductivity of porous carbon, the LPC/δ-MnO2 cathode material can offer high discharge capacity of 332.3 mAh g–1 at 0.2 A g–1 and excellent high-rate capability (196.1 mAh g–1 at 5 A g–1). Meanwhile, the assembled Zn-MnO2 battery displays good long-term cycling stability (82% capacity retention after 1000 cycles). Such superior performances are attributed to the synergetic effect of nanostructured δ-MnO2 and porous carbon scaffold, which is in favor of rapid Zn2+ ion diffusion and large contribution ratio of pseudocapacitive Zn2+ ion intercalation. The results of this study show great prospects of hybridizing biomass-derived carbon framework with electrochemically active materials towards advanced energy storage materials.

Carbon fibers

10.3389/fenrg.2020.00182

Cite

Citations (16)

Liquid-phase sintering enabling mixed ionic-electronic interphases and free-standing composite cathode architecture toward high energy solid-state battery

Nano Research (2022)

Xiang Han Weijun Zhou Minfeng Chen Linshan Luo Lanhui Gu

10.1007/s12274-022-4242-5

Cite

Citations (12)

Oriented Zn plating guided by aligned ZnO hexagonal columns realizing dendrite-free Zn metal electrodes

Journal of Colloid and Interface Science (2023)

Minfeng Chen Ming Yang Weijun Zhou Qinghua Tian Xiang Han

Plating (geology)

Bimetal

Stripping (fiber)

Dendrite (mathematics)

10.1016/j.jcis.2023.04.096

Cite

Citations (15)

Siloxane modification of polycarbonate for superior flow and impact toughness

Polymer (2010)

Weijun Zhou John O. Osby

Polycarbonate

Siloxane

Polydimethylsiloxane

Compatibilization

10.1016/j.polymer.2010.02.051

Cite

Citations (28)

Effect of silicone surfactant on the CO 2 bubble nucleation in polyol

Bulletin of the American Physical Society (2021)

Sriteja Mantha Huikuan Chao Andrew S. Ylitalo Thomas Fitzgibbons Weijun Zhou

Source

Cite

Citations (1)

Birefringent properties of cyclic block copolymers and low‐retardation‐film development

Journal of the Society for Information Display (2009)

Weijun Zhou Charles F. Diehl Dan J. Murray Kurt A. Koppi Stephen F. Hahn

Abstract— Cyclic block copolymers (CBCs) are a new class of optical polymers made by fully hydrogenating block copolymers of styrene and conjugated diene. This class of materials has excellent optical transparency, photostability, and good thermal resistance. By changing the copolymer composition and the resulting block‐copolymer morphology, a unique set of birefringence properties can be achieved. The focus of this work was to study various sources of birefringence in block copolymers using a series of model CBC materials. One particularly interesting finding relates to the development of an ultra‐low‐phase‐retardation CBC film. Unlike the conventional approach of using an additive or blend, a CBC film prepared by melt extrusion can readily achieve near‐zero retardation in both the film plane and thickness direction. This nearly isotropic CBC film is useful as a polarizer protection film in flat‐panel displays. When used as the inner protective layer of a polarizer, CBC film helps to reduce the color shift of IPS‐LCDs at oblique angles and offer a wider viewing angle.

Polarizer

Glazing

10.1889/jsid18.1.66

Cite

Citations (9)

Effect of Phase Transition on the Rheology of Model Thermotropic Liquid Crystalline Polymers

APS (1998)

Weijun Zhou Julie Kornfield

Thermotropic crystal

Source

Cite

Citations (0)

Electrolyte additive of sorbitol rendering aqueous zinc-ion batteries with dendrite-free behavior and good anti-freezing ability

Chemical Engineering Journal (2023)

Yuhui Quan Ming Yang Minfeng Chen Weijun Zhou Xiang Han

Electrochemical window

10.1016/j.cej.2023.141392

Cite

Citations (70)

Simplified Synthesis of Fluoride-Free Ti₃C₂T_x via Electrochemical Etching toward High-Performance Electrochemical Capacitors

ACS Nano (2022)

Jizhang Chen Minfeng Chen Weijun Zhou Xinwu Xu Bo Liu

MXenes have been intensively studied for electrochemical energy storage and other applications. However, time-consuming multistep procedures involving hypertoxic HF or alike are utilized in conventional synthesis methods of MXenes. Besides, -F terminal functional groups inevitably exist in these MXenes, detrimental to supercapacitor and battery performances. Herein, we develop a facile and time-saving electrochemical etching method to synthesize F-free and Cl-containing Ti3C2Tx in a mixed LiOH and LiCl aqueous solution with an etching efficiency of 92.2%. During the synthesis, sonification alone is able to delaminate Ti3C2Tx without using any hazardous organic intercalant. The obtained delaminated Ti3C2Tx flakes are ∼3.8 μm in lateral size and ∼3.9 nm in thickness, and can be stable in an aqueous dispersion for at least 15 days. The filtrated Ti3C2Tx film is 20.5 MPa in tensile strength, 13.4 GPa in Young's modulus, and 1663 S cm-1 in electrical conductivity, and exhibits specific capacitances of 323.7 F g-1, 1.39 F cm-2, and 1160 F cm-3 for supercapacitors. Also, a flexible zinc-ion hybrid capacitor with energy density values of 20.8 mWh cm-3 and 249.9 μWh cm-2 is assembled by using the Ti3C2Tx film as the cathode, and can maintain almost all its capacity under bending.

MXenes

10.1021/acsnano.1c09004

Cite

Citations (154)