23 research outputs found
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Photoreforming of lignocellulose into H2 using nano-engineered carbon nitride under benign conditions
Photoreforming of lignocellulose is a promising approach
toward sustainable H2 generation, but this kinetically challenging
reaction currently requires UV-absorbing or toxic light absorbers
under harsh conditions. Here, we report a cyanamide-functionalized
carbon nitride, NCNCNx, which shows enhanced performance
upon ultra-sonication. This activated NCNCNx allows for the
visible-light driven conversion of purified and raw lignocellulose
samples into H2 in the presence of various proton reduction co-catalysts.
The reported room-temperature photoreforming process operates
under benign aqueous conditions (pH ~2-15) without the
need for toxic components.Austrian Federal Ministry for Digital and Economic Affairs, the National Foundation for Research, Technology and Development, OM
Research on the Leading Value Drive of Rural Homestead Transfer under Rural RevitalizationââBased on the Evidences of China
With the development of urban-rural integration in China, the functional value of homestead bases has evolved from a single residential security value to a multiple composite values, and the property income of homestead bases has gradually become the value driver of transfer and the intrinsic demand of farm households. This paper takes Baitafan of Jinzhai County, Chongqing City, and Xiaofang Yu Village of Ji County as examples for in-depth discussion, and finds that the dominant value drivers of home base transfer mainly include three kinds: capitalization income, commercialization income, and non-farm employment income. The study concludes that it is important to give full play to the resource endowment effect and identify the dominant value of home base transfer according to local conditions to promote the standardized home base transfer and implement the rural revitalization strategy
High-quality factor, high-confinement microring resonators in 4H-silicon carbide-on-insulator
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Designing Vanadium Oxide/Graphene Composite Electrodes for Aqueous Energy Storage Systems
Energy storage technologies have emerged as a critical component in the sustainable development of the global energy landscape. Aqueous energy storage systems are considered to be a promising solution to reliably store the energy generated from renewable sources and deliver electricity to the grid on demand. From bulk storage to uninterrupted power supply, large-scale energy storage systems of various power capacity and discharge frequency are needed, requiring rational designs of different electrochemical systems. In this work, unconventional high-energy-density supercapacitors and innovative fast-charging batteries are explored. Utilizing a facile laser scribing fabrication approach, earth-abundant, low-cost, electrochemically active vanadium oxides are incorporated onto highly conductive graphene scaffold. Symmetric supercapacitors based on this composite electrode exhibit high energy densities that are close to conventional batteries. Furthermore, with synthetic modifications, the vanadium oxides/graphene composite is applied as the cathode material in a zinc-ion battery, leading to state-of-the-art rate capability and high-rate cycling stability. Moreover, the synthesis and charge storage mechanism of the pseudocapacitive electrode are further investigated in an aqueous hybrid Li-ion battery
In-Situ Conversion of ZnO/Ni3ZnC0.7/CNT Composite from NiZn Bimetallic MOF Precursor with Enhanced Electromagnetic Property
ZnO/Ni3ZnC0.7/x% CNT (x = 0, 2, 5, 10) urchin-like structures have been synthesized using a facile method based on metal-organic frameworks (MOFs) and applied as the electromagnetic absorber. The results of the experiments demonstrate that the content of multi-wall carbon nanotubes (MWCNT) has a great influence on the absorbing performance of the hybrid material. Conduction loss, interfacial polarization and ferromagnetic resonance all contribute to the electromagnetic absorption. The urchin-like ZnO/Ni3ZnC0.7/5% CNT composite presents excellent absorbing properties. When the filler loading of ZnO/Ni3ZnC0.7/5% CNT composite in paraffin matrix is only 10 wt.%, a minimum reflection loss of −33.2 dB is achieved at a layer thickness of 4.9 mm
Roots Fuel Cell Produces and Stores Clean Energy
In recent years, extensive scientific efforts have been
conducted
to develop clean bioenergy technologies. A promising approach that
has been under development for more than a hundred years is the microbial
fuel cell (MFC) which utilizes exoelectrogenic bacteria as an electron
source in a bioelectrochemical cell. The viability of bacteria in
soil MFCs can be maintained by integrating plant roots, which release
organic materials that feed the bacteria. In this work, we show that
rather than organic compounds, roots also release redox species that
can produce electricity in a biofuel cell. We first studied the reduction
of the electron acceptor Cytochrome C by green onion roots. We integrate
green onion roots into a biofuel cell to produce a continuous bias-free
electric current for more than 24 h in the dark. This current is enhanced
upon irradiation of the onionâs leaves with light. We apply
cyclic voltammetry and 2D-fluorescence measurements to show that NADH
and NADPH act as major electron mediators between the roots and the
anode, while their concentrations in the external root matrix are
increased upon irradiation of the leaves. Finally, we show that roots
can contribute to energy storage by charging a supercapacitor
Correction: Weng et al. New International Association for the Study of Lung Cancer (IASLC) Pathology Committee Grading System for the Prognostic Outcome of Advanced Lung Adenocarcinoma. Cancers 2020, 12, 3426
The authors would like to make a correction to their published paper [...
Silicon-on-insulator with hybrid orientations for heterogeneous integration of GaN on Si (100) substrate
Heterogeneous integration of materials pave a new way for the development of the microsystem with miniaturization and complex functionalities. Two types of hybrid silicon on insulator (SOI) structures, i.e., Si (100)-on-Si (111) and Si (111)-on-Si (100), were prepared by the smart-cut technique, which is consist of ion-slicing and wafer bonding. The precise calculation of the lattice strain of the transferred films without the epitaxial matching relationship to the substrate was demonstrated based on X-ray diffraction (XRD) measurements. The XRD and Raman measurement results suggest that the transferred films possess single crystalline quality. With a chemical mechanical polishing (CMP) process, the surface roughness of the transferred thin films can be reduced from 5.57 nm to 0.30 nm. The 4-inch GaN thin film epitaxially grown on the as-prepared hybrid SOI of Si (111)-on-Si (100) by metalorganic chemical vapor deposition (MOCVD) is of improved quality with a full width at half maximum (FWHM) of 672.54 arcsec extracted from the XRD rocking curve and small surface roughness of 0.40 nm. The wafer-scale GaN on Si (111)-on-Si (100) can serve as a potential platform for the one chip integration of GaN-based high electron mobility transistors (HEMT) or photonics with the Si (100)-based complementary metal oxide semiconductor (CMOS)