Jiewu Cui

Bio: Jiewu Cui is an academic researcher from Hefei University of Technology. The author has contributed to research in topics: Materials science & Supercapacitor. The author has an hindex of 25, co-authored 98 publications receiving 1626 citations. Previous affiliations of Jiewu Cui include Rice University & Monash University, Gippsland campus.

Coordination derived stable Ni–Co MOFs for foldable all-solid-state supercapacitors with high specific energy

Abstract: In this work, polycrystalline flower-like Ni–Co metal–organic frameworks (Ni–Co MOFs) have been fabricated by a simple hydrothermal method with further electrochemical activation. The mixed metal centers and polycrystalline nature are beneficial for the transport of electrons and ions. The Ni–Co MOF exhibits a high specific capacity of 833 C g−1 at 0.5 A g−1 and maintains 714 C g−1 at 20 A g−1. Meanwhile, a very good cycling stability is achieved after 5000 cycles. All-solid-state supercapacitors have been assembled using the Ni–Co MOF, polybenzimidazole (PBI) and activated carbon (AC). A high specific capacitance of 172.7 F g−1 at 0.5 A g−1 in a large potential window of 1.8 V has been achieved, which corresponds to a high specific energy of 77.7 W h kg−1 and 0.45 kW kg−1, respectively. Meanwhile, the devices also exhibit very good flexibility under bending and folding conditions with no obvious capacitance change due to the good mechanical properties of PBI. The influence of temperature on the performance of the all-solid-state devices has been evaluated. To avoid side reactions at high temperature, the device works better at relatively low temperature. This work suggests that the Ni–Co MOF and PBI solid polymer electrolyte based foldable all-solid-state supercapacitors are very promising for application in wearable and portable electronic devices.

A facile synthesis of mesoporous Co3O4/CeO2 hybrid nanowire arrays for high performance supercapacitors

Abstract: The development of porous yet densely packed nanomaterials with high ion-accessible surface area and long cycling life is critical to the realization of high-density electrochemical capacitive energy storage. In this paper, we report a facile hydrothermal method to fabricate Co3O4/CeO2 hybrid nanowire arrays (NWAs). Supercapacitors based on the as-prepared mesoporous Co3O4/CeO2 hybrid NWAs exhibit excellent pseudocapacitive performance with a capacitance of 4.98 F cm−2 at 10 mA cm−2 (1037.5 F g−1 at 2.08 A g−1) and only a small capacitance loss of 5.6% after 5000 charge/discharge cycles. The remarkable pseudocapacitance and superior stability suggest that mesoporous Co3O4/CeO2 hybrid NWAs are promising candidates for supercapacitor applications.

Improving the Catalytic Activity of Carbon‐Supported Single Atom Catalysts by Polynary Metal or Heteroatom Doping

Abstract: Single atom catalysts (SACs) are widely researched in various chemical transformations due to the high atomic utilization and catalytic activity. Carbon-supported SACs are the largest class because of the many excellent properties of carbon derivatives. The single metal atoms are usually immobilized by doped N atoms and in some cases by C geometrical defects on carbon materials. To explore the catalytic mechanisms and improve the catalytic performance, many efforts have been devoted to modulating the electronic structure of metal single atomic sites. Doping with polynary metals and heteroatoms has been recently proposed to be a simple and effective strategy, derived from the modulating mechanisms of metal alloy structure for metal catalysts and from the donating/withdrawing heteroatom doping for carbon supports, respectively. Polynary metals SACs involve two types of metal with atomical dispersion. The bimetal atom pairs act as dual catalytic sites leading to higher catalytic activity and selectivity. Polynary heteroatoms generally have two types of heteroatoms in which N always couples with another heteroatom, including B, S, P, etc. In this Review, the recent progress of polynary metals and heteroatoms SACs is summarized. Finally, the barriers to tune the activity/selectivity of SACs are discussed and further perspectives presented.

Carbon Microtube Aerogel Derived from Kapok Fiber: An Efficient and Recyclable Sorbent for Oils and Organic Solvents.

Abstract: A carbon microtube aerogel (CMA) with hydrophobicity, strong adsorption capacity, and superb recyclability was obtained by a feasible approach with economical raw material, such as kapok fiber. The CMA possesses a great adsorption capacity of 78-348 times its weight. Attributed to its outstanding thermal stability and excellent mechanical properties, the CMA can be used for many cycles of distillation, squeezing, and combustion without degradation, which suggests a potential practical application in oil-water separation. In addition, the adsorption capacity still retained 98% by distillation, 97% by squeezing, and 90% by combustion after 10 cycles. Therefore, the obtained CMA has a broad prospect as an economical, efficient, and environmentally friendly adsorbent.

MOF-74 derived porous hybrid metal oxide hollow nanowires for high-performance electrochemical energy storage

Abstract: Metal–organic framework-derived materials have attracted much attention due to their great potential for applications in energy storage and conversion. Herein, we report a rational design and organic solvent-free synthesis of MOF-74 and derived hybrid metal oxide nanowires with hollow structure. The evolution process and mechanism of MOF-74 have been investigated by adjusting solvent compositions and Ni/Co ratios. Different phases of metal oxide nanowires can be tailored after calcinations, enabling the systematic investigation of the effect of different metal species counts on the electrochemical properties of hybrid metal oxide nanomaterials. Results indicate that the hybrid metal oxides exhibit obvious advantages compared with monometallic oxides of Co3O4 and NiO, and NiO/NiCo2O4 (1 : 1) with two mixed phases of NiCo2O4 and NiO exhibits a superior specific capacity of 732.0C g−1 at a current density of 1 A g−1 among three different hybrid metal oxides. Furthermore, an assembled asymmetric supercapacitor device achieves a high specific energy density of 46.9 W h kg−1 at a specific power density of 425.3 W kg−1 with excellent cycling performance. The as-prepared materials will be competitive and promising candidates for electrochemical energy storage and other applications.

Cu and Cu-Based Nanoparticles: Synthesis and Applications in Catalysis.

Abstract: The applications of copper (Cu) and Cu-based nanoparticles, which are based on the earth-abundant and inexpensive copper metal, have generated a great deal of interest in recent years, especially in the field of catalysis. The possible modification of the chemical and physical properties of these nanoparticles using different synthetic strategies and conditions and/or via postsynthetic chemical treatments has been largely responsible for the rapid growth of interest in these nanomaterials and their applications in catalysis. In addition, the design and development of novel support and/or multimetallic systems (e.g., alloys, etc.) has also made significant contributions to the field. In this comprehensive review, we report different synthetic approaches to Cu and Cu-based nanoparticles (metallic copper, copper oxides, and hybrid copper nanostructures) and copper nanoparticles immobilized into or supported on various support materials (SiO2, magnetic support materials, etc.), along with their applications i...

Materials Design and Discovery with High-Throughput Density Functional Theory: The Open Quantum Materials Database (OQMD)

Abstract: High-throughput density functional theory (HT DFT) is fast becoming a powerful tool for accelerating materials design and discovery by the amassing tens and even hundreds of thousands of DFT calculations in large databases. Complex materials problems can be approached much more efficiently and broadly through the sheer quantity of structures and chemistries available in such databases. Our HT DFT database, the Open Quantum Materials Database (OQMD), contains over 200,000 DFT calculated crystal structures and will be freely available for public use at http://oqmd.org . In this review, we describe the OQMD and its use in five materials problems, spanning a wide range of applications and materials types: (I) Li-air battery combination catalyst/electrodes, (II) Li-ion battery anodes, (III) Li-ion battery cathode coatings reactive with HF, (IV) Mg-alloy long-period stacking ordered (LPSO) strengthening precipitates, and (V) training a machine learning model to predict new stable ternary compounds.