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Low cost materials with high electrochemical catalytic activity for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) are in urgent demand for energy storage and conversion devices. In this work, we propose a novel and environmentally-friendly approach to synthesize in situ a meso-porous MnOx/S doped graphitized carbon (MnOx/S-GC) hybrid with a specific surface area of 502.6m2g−1...
Oxygen evolution reaction (OER) is critical to many important energy conversion and storage processes. However, the kinetics of OER is typically sluggish, and conventional OER catalysts are scarce and expensive. Hence, inexpensive and effective catalysts that accelerate the OER kinetics and reduce the overpotential are urgently needed. In this paper, we reported multi-layer graphene-supported perovskite...
Electronic structures and related properties of a defective endohedral metallofullerene U2@C61-Def[5,6] are studied using density functional theory. It is shown that unlike the U2@C61-Def[6,6] which has a nonet ground state, the U2@C61-Def[5,6] has a quintet ground spin state with a lower total energy than the U2@C61-Def[6,6]. This is due to the antiferromagnetic coupling of the net spin electrons...
We report an inverse relationship between measurable porosity values and reversible capacity from sucrose-derived hard carbon as an anode for sodium-ion batteries (SIBs). Materials with low measureable pore volumes and surface areas obtained through N2 sorption yield higher reversible capacities. Conversely, increasing measurable porosity and specific surface area leads to sharp decreases in reversible...
Recent studies have demonstrated that carbon nano-onion (CNO) is a promising candidate for high-power supercapacitors due to the nonporous outer shell, which is easily accessible to electrolyte ions. However, the nonporous ion-accessible outer shells also limit the energy density of the CNOs, which requires large specific surface area. Introducing porosity to the outer shells of CNOs can effectively...
Freestanding, two-dimensional (2D), amorphous carbon nanosheets (CNSs) were formed from a preceramic polymer, poly(phenylcarbyne), through laser ablation using a pulsed Nd:YAG laser. CNSs of several nanometers in thickness and micrometers in size were obtained. The polymer-to-carbon transition was investigated at different laser fluences and target-to-substrate distances. Three different phases, amorphous...
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