Article
Materials Science, Multidisciplinary
Huan Liu, Daozhang Liu, Xu Cheng, Zhongsheng Hua, Shiwei He
Summary: The study presented a rationally designed 3D Ni-Mo/NF with a hierarchical structure, which showed excellent catalytic performance with low overpotentials, small Tafel slope, and long-term operational stability, attributed to its amorphous and hierarchical structure with favorable active sites.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Ceramics
Jianhui Chen, Ziran Ye, Mingjia Zhi, Zhanglian Hong
Summary: This study presents a simple method for synthesizing highly porous Co2Ni and Co2Ni/reduced graphene oxide composite aerogels in an aqueous solution. The composite materials show excellent catalytic activity for hydrogen evolution in alkaline electrolytes.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Yu-Hsiang Hsueh, Ashok Ranjan, Lian-Ming Lyu, Kai-Yuan Hsiao, Yu-Cheng Chang, Ming-Pei Lu, Ming-Yen Lu
Summary: This study investigates the effect of stacking faults (SFs) on electromigration in silver nanowires (AgNWs), specifically with regards to necking and void growth. AgNWs are synthesized using the galvanic replacement reaction at a low cost. By varying the concentration of silver nitrate, AgNWs with and without SFs are obtained. In situ TEM analysis provides strong evidence that SFs effectively suppress the migration of surface atoms. Additionally, the investigation of void growth process reveals that SF facets parallel to the {111} plane contribute to anisotropic morphological changes and slow down the rate of void growth by 135 times. Therefore, planar defects can extend the lifetimes of devices by causing intrinsic changes to material properties.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Physical
Yifan Liu, Rashad Ali, Jun Ma, Wei Jiao, Liangjun Yin, Chunhong Mu, Xian Jian
Summary: A novel carbon-based material, graphene capsules-decorated boron-carbon-nitride sheets, has been developed to enhance the catalytic performance for the hydrogen evolution reaction by increasing surface area and providing more active sites. The 3D hollow structure of graphene capsules contributes to achieving higher efficiency in acidic conditions.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Yahao Li, Changzhi Ai, Shengjue Deng, Yadong Wang, Xili Tong, Xiuli Wang, Xinhui Xia, Jiangping Tu
Summary: The study introduces a strategy to synthesize nitrogen doped vertical graphene (N-VG) array for catalyzing hydrogen evolution reaction (HER) in acidic electrolyte, demonstrating enhanced HER performance due to the introduction of N heteroatom leading to increased surface area and optimized electronic structure. Additionally, two possible enhancement mechanisms of N-VG are revealed with first-principle calculations, confirming the effectiveness of N doping in improving HER performance.
MATERIALS RESEARCH BULLETIN
(2021)
Article
Nanoscience & Nanotechnology
Christian Iffelsberger, Stefan Wert, Frank-Michael Matysik, Martin Pumera
Summary: Flow reactors play a crucial role in chemical synthesis, electrochemical reactions, and wastewater treatment, with catalyst activity spatial analysis being important for optimization. The use of scanning electrochemical microscopy allows for localized tracking of catalytic activity with high resolution.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Analytical
Sadia Khan, Tayyaba Noor, Naseem Iqbal, Erum Pervaiz
Summary: This study focuses on the rational design and synthesis of catalysts for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). The 5 wt% rGO@Fe-Co/NC composite shows superior electrochemical activity and stability for both HER and OER in alkaline media.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Physical
Piyush Kumar, Frances Dinsmore, Wujian Miao
Summary: In this study, a low-cost and readily synthesized binder-free hydrogen bubble-assisted one-step electrodeposited microporous electrocatalyst was developed. The catalyst showed low overpotential and high stability, demonstrating excellent oxygen evolution reaction activity.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Jun-Xi Wu, Partha Pratim Bag, Yan-Tong Xu, Li Gong, Chun-Ting He, Xiao-Ming Chen, Jie-Peng Zhang
Summary: A new type of catalyst support using hydrogen-bonded ultrathin nanosheets was developed, demonstrating high stability and electron modulation effects. This pseudo-porous catalyst support also showed potential for application in other metal phosphides.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Physical
Zuolei Zhu, Chenxi Xu, Yucheng Wang, Ling Wang, Zhou Chang, Zhongwei Fang, Xiaoteng Liu, Jigui Cheng
Summary: A non-precious metal electrocatalyst for oxygen evolution reaction is achieved by synergistically coupling layered double hydroxides and hybrid supports. The catalyst exhibits superior activity with a promising low overpotential in alkaline medium due to the strong interfacial interaction and electronic coupling between components.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Hongwei Jiang, Ning Cong, Hucheng Jiang, Miaojie Tian, Zhiqiang Xie, Hua Fang, Juanjuan Han, Zhandong Ren, Yuchan Zhu
Summary: In this study, trumpet-shaped Ru on amorphous cobalt support (T-Ru/a-Co) was prepared for the first time using the dynamic hydrogen bubble template (DHBT) electrodeposition method. The T-Ru/a-Co catalyst exhibited uniformly distributed defect locations on the amorphous cobalt surface, which effectively led to the formation of nano-bubble template. In addition, the electronic structure of T-Ru/a-Co was significantly modified, resulting in increased proportion of Ru4+/Ru0 and altered binding energy of Ru. The T-Ru/a-Co catalyst demonstrated higher specific activity (SA), turnover frequency (TOF), and mass activity (MA) compared to Pt/C, disk-shaped Ru on crystalline cobalt support (D-Ru/c-Co), and Ru/C.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Organic
Danbo Wang, Lin Zhang, Yingjie Zhao
Summary: In this study, an interlocked covalent organic molecular cage with a trigonal-prismatic structure based on anthracene units and imine bonds was synthesized by a template-free and one-pot reaction. The cause of weak supramolecular interaction-induced synthesis was proposed by comparing the single-crystal structures of the interlocked cage and two additional monomeric cages as reference compounds.
JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Halima Begum, Mohammad Shamsuddin Ahmed, Seunghun Jung
Summary: Efficient bifunctional metal-free carbon catalysts for electrochemical water splitting have been designed by incorporating intramolecular nitrogen reorientation in hollow carbon nanoballs on graphene. The optimized catalyst shows enhanced electrocatalytic activities for both oxygen and hydrogen evolution reactions, mainly due to suitable nitrogen active sites and edge defects with microchannels that facilitate electrolyte penetration and improve stability. Superior conductivity and high surface area of the catalyst also boost electrocatalytic activity by supporting efficient charge transport and rapid mass diffusion with gas release.
ADVANCED MATERIALS INTERFACES
(2021)
Review
Multidisciplinary Sciences
Ajin Rajan, Anoop P. Pushkar, Balaji C. Dharmalingam, Jithin John Varghese
Summary: Modern heterogeneous catalysis benefits greatly from computational predictions of catalyst structure and its evolution, first-principles mechanistic investigations, and detailed kinetic modeling. This article presents operando catalyst structure prediction techniques using density functional theory simulations and ab initio thermodynamics calculations, as well as surface structure characterization and hierarchical approaches in kinetic parameter estimation. In addition, a bottom-up hierarchical and closed loop modeling framework is proposed.
Article
Biochemistry & Molecular Biology
Su-Jeong Bak, Sun- Kim, Su-yeong Lim, Taehyo Kim, Se-Hun Kwon, Duck Hyun Lee
Summary: The study demonstrated highly efficient oxygen reduction catalysts composed of uniform Pt nanoparticles on small, reduced graphene oxides (srGO). The catalysts exhibited efficient surface reactions, large surface areas, high metal dispersions, and excellent oxygen reduction performance. Detailed investigations suggested that the chemical functionality and electrical conductivity greatly influenced the enhanced oxygen reduction efficiency of the catalysts.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Review
Chemistry, Multidisciplinary
Mali Zhao, Dohyun Kim, Young Hee Lee, Heejun Yang, Suyeon Cho
Summary: This paper introduces critical advances in the field of quantum sensing of thermopower, ranging from atomic to several-hundred-nanometer scales, and discusses the roles of low-dimensionality, defects, spins, and relativistic effects in optimized power generation. Investigating the microscopic nature of thermopower in quantum materials can provide insights for the design of advanced materials for future thermoelectric applications, while quantum sensing techniques for thermopower can pave the way for practical and novel energy devices towards a sustainable society.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Cheng Lin, Chaoran Dong, Sungsoon Kim, Yuan Lu, Yulan Wang, Zhiyang Yu, Yu Gu, Zhiyuan Gu, Dong Ki Lee, Kan Zhang, Jong Hyeok Park
Summary: By a simple annealing process, an enhanced Mie scattering effect of the well-documented porous BiVO4 photoanode was obtained, which significantly reduced reflectivity, increased light absorbability, and achieved efficient photo-electrochemical (PEC) oxidation of glycerol (GLY) to dihydroxyacetone (DHA) on the photoanode.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yonas Assefa Eshete, Eunji Hwang, Junhyung Kim, Phuong Lien Nguyen, Woo Jong Yu, Bai Sun Kong, Min Seok Jang, Jaekwang Lee, Suyeon Cho, Heejun Yang
Summary: Researchers have developed a polymorphic memtransistor based on Mo0.91W0.09Te2, which allows tuning of the lattice and electronic structures of the channel material to achieve metallic or semiconducting phases. This memtransistor exhibits high on/off ratio, low subthreshold swing, and various memristive behaviors, making it suitable for neuromorphic and in-memory computing applications.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Gwanghyun Lee, Yunkyu Choi, Hyungjoon Ji, Ju Yeon Kim, Jeong Pil Kim, Junhyeok Kang, Ohchan Kwon, Dae Woo Kim, Jong Hyeok Park
Summary: A highly stable silicon microparticle anode with high energy density is achieved using a hybrid binder made of functionalized carbon nanotubes and poly(acrylic acid). The anode exhibits excellent stability and capacity retention during cycling tests.
Article
Engineering, Chemical
Daero Lee, Chanui Park, Young Gyun Choi, Seunghyok Rho, Won Bo Lee, Jong Hyeok Park
Summary: A selective Li+ conductive solid-state electrolyte (SLCSE) composed of a highly conductive CMA polymer matrix and branched polyamine is reported. The incorporation of rigid benzene-ring constituents in the matrix enhances both mechanical strength and Li+ transportation. The SLCSE exhibits high ionic conductivity, high Li+ transference number, and exceptional stability, making it a promising candidate for solid-state Li-metal batteries.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Jie Jin, Shipeng Wan, SunJe Lee, Cheoulwoo Oh, Gyu Yong Jang, Kan Zhang, Ziyang Lu, Jong Hyeok Park
Summary: A micromolar amount of dye-based modulator (Rhodamine B) is used to easily and controllably tailor the pore size of a Ti-based metal-organic framework (MIL-125-NH2). The resulting hierarchically porous MIL-125-NH2 (RH-MIL-125-NH2) exhibits optimized adsorption and photocatalytic activity. This work provides a meaningful basis for the construction of hierarchically porous MOFs and demonstrates the superiority of the hierarchical pore structure for adsorption and heterogeneous catalysis.
Article
Multidisciplinary Sciences
Minje Ryu, Young-Kuk Hong, Sang-Young Lee, Jong Hyeok Park
Summary: In this study, a feasible and sustainable dry press-coating process is proposed to fabricate electrodes for lithium-ion batteries. This process improves the mechanical strength and performance of the electrodes compared to traditional wet coating, allowing for high loading and impressive specific energy and volumetric energy density.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Ui Yeon Won, Quoc An Vu, Sung Bum Park, Mi Hyang Park, Van Dam Do, Hyun Jun Park, Heejun Yang, Young Hee Lee, Woo Jong Yu
Summary: In this study, multi-neuron connection is demonstrated using a multi-terminal floating-gate memristor (MT-FGMEM). The MT-FGMEM can accurately emulate membrane potential of neuron in multiple connections, with high on/off ratio and long retention time. Compared to conventional neurons, it significantly reduces energy consumption and enables training and classification similar to visual functions of the brain.
NATURE COMMUNICATIONS
(2023)
Review
Nanoscience & Nanotechnology
Yanggeun Joo, Eunji Hwang, Heemyoung Hong, Suyeon Cho, Heejun Yang
Summary: Memory devices are crucial in modern electronics, and efforts to surpass traditional digital read and write methods have led to the growth of neuromorphic technology. There is a rising demand for memory devices with continuous memory states, longer retention times, and higher integration density. This review focuses on the application of 2D ferroelectric materials in memory and synaptic devices, discussing three types of memory devices based on these materials. The challenges of using atomically thin ferroelectric materials and their potential as critical elements for memory and synaptic devices are also explored.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Physical
Han Gyo Jeong, Gwanghyun Lee, Jong Hyeok Park
Summary: Silicon is a promising active material for lithium-ion batteries with a high theoretical capacity. However, its fabrication requires complicated and high-cost processes to improve cyclic performance. Herein, we report a one-step wet ball-milling process to fabricate submicron silicon particles coated with a polyacrylonitrile (PAN) layer, which enhances electrolyte wettability and increases lithium-ion pathways on the silicon surface. These improvements result in a stable solid electrolyte interphase layer and reduced internal resistance of the electrodes. The silicon anodes with optimal particle size and PAN layer exhibit superior performance even at ultra-fast current density, and when combined with an NCM712 cathode, a full-cell demonstrates excellent performance.
ACS APPLIED ENERGY MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Dohyun Kim, Juhi Pandey, Juyeong Jeong, Woohyun Cho, Seungyeon Lee, Suyeon Cho, Heejun Yang
Summary: Polymorphic 2D materials enable the engineering of structural and electronic phases, facilitating energy-efficient, cost-effective, and scalable device applications. Phase engineering encompasses not only conventional transitions but also magnetic states, correlated band structures, and topological phases in various 2D materials. This review explores the precise manipulation and patterning of local phases, especially at ideal and versatile phase interfaces, for electronic and energy device applications. This research emphasizes the potential of phase patterning in emerging 2D materials in the development of breakthroughs in electronic, quantum, and energy devices.
Article
Chemistry, Multidisciplinary
Mihui Park, Seonyong Cho, Junghoon Yang, Vincent Wing-hei Lau, Kwang Hee Kim, Jong Hyeok Park, Stefan Ringe, Yong-Mook Kang
Summary: The use of heterogeneous catalysts as substrates can regulate the growth of Li2O2 and the formation of solid/solid reaction interfaces, improving the reversibility, capacity, and durability of lithium-oxygen batteries.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Multidisciplinary Sciences
Jiwon Kim, Jae Hyung Kim, Cheoulwoo Oh, Hyewon Yun, Eunchong Lee, Hyung-Suk Oh, Jong Hyeok Park, Yun Jeong Hwang
Summary: An electro-assisted approach using acid-treated carbon electrocatalyst and in-situ cathodically generated reactive oxygen species is proposed for the partial oxidation of methane at ambient temperature and pressure. Reactive oxygen species activate methane and methanol, leading to selective methane partial oxidation. This study presents a method for the electrochemically assisted partial oxidation of methane to produce liquid oxygenate, HCOOH, selectively.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Lijun Li, Ju-Yeong Jeong, Yanggeun Joo, Heemyoung Hong, Se Kwon Kim, Heejun Yang
Summary: In this research, unique phase-slip centers were designed in artificially-stacked junction areas, and energy dissipation was observed. Two types of energy dissipation modes were newly identified in the artificially-stacked NbSe2 when subjected to an in-plane magnetic field.
Review
Chemistry, Physical
Tae-Kyung Liu, Gyu Yong Jang, Sungsoon Kim, Kan Zhang, Xiaolin Zheng, Jong Hyeok Park
Summary: Aqueous photoelectrochemical (PEC) cells are a promising technology for converting solar energy into hydrogen, but their efficiency and cost-effectiveness are limited by sluggish oxygen evolution reaction (OER) kinetics and the low economic value of the produced oxygen gas. Organic upgrading PEC reactions, especially alternative OERs, have gained considerable attention for improving efficiency and economic effectiveness. This review provides an overview of PEC reaction fundamentals, cost analysis, recent advances in organic upgrading reactions using different substrates, and discusses the current status, future prospects, and challenges towards industrial applications.