Carbonaceous materials,especially microporous carbon,have aroused great interests in the R&D(research and development) of supercapacitor due to the low specific weight and large surface ***,the rich porosity usual...
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Carbonaceous materials,especially microporous carbon,have aroused great interests in the R&D(research and development) of supercapacitor due to the low specific weight and large surface ***,the rich porosity usually is in conflict with high stack density,resulting in carbon materials with good specific capacitance but low volumetric capacitance.
＜正＞Porous carbon materials are ideal supercapacitor electrode materials due to their excellent electric conductivity,high surface area,tunable pore size,high chemical stability,and low *** phenolic resin as the pre...
＜正＞Porous carbon materials are ideal supercapacitor electrode materials due to their excellent electric conductivity,high surface area,tunable pore size,high chemical stability,and low *** phenolic resin as the precursor,we designed a series of porous carbon materials,such as microporous carbon spheres,pomegranate-like carbon spheres,yolk@shell structures,ultrafine
＜正＞Rechargeable lithium ion batteries（LIBs）currently dominate the market for portable energy storage and more recently in electric vehicles,owing to their reliable cycling and high energy ***,the currently commer...
＜正＞Rechargeable lithium ion batteries（LIBs）currently dominate the market for portable energy storage and more recently in electric vehicles,owing to their reliable cycling and high energy ***,the currently commercialized LIBs cannot meet the growing demand for the large-scale energy storage and electronic devices due to the limited lithium supply leading to the increasing manufacturing *** safety issue owing to the use of flammable organic electrolytes in conventional LIBs is another *** ion batteries（NIBs）
The aqueous zinc ion batteries（ZIBs）combining with inexpensive zinc anode and nontoxic aqueous electrolyte are highly desirable for large-scale energy ***,their applications are hindered by the limited performance o...
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The aqueous zinc ion batteries（ZIBs）combining with inexpensive zinc anode and nontoxic aqueous electrolyte are highly desirable for large-scale energy ***,their applications are hindered by the limited performance of cathode materials,which often deliver a poor rate capability and inferior cycle ***,The V02 nanorods show significantly electrochemical performance when used as intercalation cathode for aqueous ***,the V02 nanorods display high initial capacity of 325.6 mAh g-1 at 0.05 A g-1,good rate capability and excellent cycling stability with the capacity retention of 86% over 5000 cycles at 3.0 A ***,the V02 unit cell expands sequentially in a,b,and c directions during discharge and reversibly contracts back during charge,the zinc storage mechanism is revealed to be a highly reversible single-phase reaction by operando techniques and corresponding qualitative *** work not only opens a new door to the practical application of V02 in ZIB systems,but also broadens the horizon in understanding the electrochemical behavior of rechargeable ZIBs.
＜正＞Oxygen reduction reaction（ORR） and oxygen evolution reaction（OER） are vital electrochemical processes for fuel cells,water oxidation and various rechargeable metal-air（oxygen） ***,developing practical elec...
＜正＞Oxygen reduction reaction（ORR） and oxygen evolution reaction（OER） are vital electrochemical processes for fuel cells,water oxidation and various rechargeable metal-air（oxygen） ***,developing practical electrocatalysts with enhanced electrochemical properties remains as a major design challenge due to inevitable use of noble Pt（Ir,Ru etc.）-based electrocatalysts with the most efficient electrocatalytic ***,
With high theoretical capacity,natural abundance,and low cost,silicon oxides have emerged as a promising family of anode materials for next-generation lithium-ion batteries(LIBs).However,their widespread application h...
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With high theoretical capacity,natural abundance,and low cost,silicon oxides have emerged as a promising family of anode materials for next-generation lithium-ion batteries(LIBs).However,their widespread application has been significantly hampered by the intrinsic poor electronic conductivity,large volume variation,
Cooperative coupling of H 2 evolution with oxidative organic synthesis is promising in avoiding the use of sacrificial agents and producing hydrogen energy with value-added chemicals simultaneously. Nonetheless, the p...
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Cooperative coupling of H 2 evolution with oxidative organic synthesis is promising in avoiding the use of sacrificial agents and producing hydrogen energy with value-added chemicals simultaneously. Nonetheless, the photocatalytic activity is obstructed by sluggish electron-hole separation and limited redox potentials. Herein, Ni-doped Zn 0.2 Cd 0.8 S quantum dots are chosen after screening by DFT simulation to couple with TiO 2 microspheres, forming a step-scheme heterojunction. The Ni-doped configuration tunes the highly active S site for augmented H 2 evolution, and the interfacial Ni−O bonds provide fast channels at the atomic level to lower the energy barrier for charge transfer. Also, DFT calculations reveal an enhanced built-in electric field in the heterojunction for superior charge migration and separation. Kinetic analysis by femtosecond transient absorption spectra demonstrates that expedited charge migration with electrons first transfer to Ni 2+ and then to S sites. Therefore, the designed catalyst delivers drastically elevated H 2 yield (4.55 mmol g −1 h −1 ) and N-benzylidenebenzylamine production rate (3.35 mmol g −1 h −1 ). This work provides atomic-scale insights into the coordinated modulation of active sites and built-in electric fields in step-scheme heterojunction for ameliorative photocatalytic performance.
We have used transient terahertz (THz) photoconductivity measurements to demonstrate that upon optical excitation of CH3NH3PbI3 perovskite, the hole transfers from CH3NH3PbI3 into organic hole-transporting material (H...
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Despite their high-energy density, low cost and environmental friendliness, the commercial application of lithium-sulfur batteries (LSBs) has been plagued by their severe capacity decay during long-term cycling caused...
Despite their high-energy density, low cost and environmental friendliness, the commercial application of lithium-sulfur batteries (LSBs) has been plagued by their severe capacity decay during long-term cycling caused by polysulfide shuttling. Herein, we demonstrate a synergetic vacancy and heterostructure engineering strategy using a nitrogen-doped graphene/SnS2/TiO2 (denoted as NG/SnS2/TiO2) nanocomposite to enhance the electrochemical performance of LSBs. It is noted that plentiful sulfur vacancy (Vs) defects and nanosized heterojunctions are created on the NG/SnS2/TiO2 composite as proved using electron paramagnetic resonance, transmission electron microscopy and X-ray photoelectron spectroscopy, which can serve as strong adsorption and activation sites for polar polysulfide intermediates, prevent their dissolution/shuttling, and accelerate their redox reaction. The novel NG/SnS2/TiO2-S cathode delivers a high initial capacity of 1064 mA h g-1 at 0.5 C and a high capacity retention rate of 68% after 500 cycles at 0.5 C.
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