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Nitrogen doping is an effective strategy to improve potassium ion storage of carbon electrodes via the creation of adsorption sites. However, various undesired defects are often uncontrollably generated during the doping process, limiting doping effect on capacity enhancement and deteriorating the electric conductivity. Herein, boron element is additionally introduced to construct 3D interconnected...
To improve the efficiency of photovoltaic grid-connected system, photovoltaic grid-connected inverter has been designed based on two stages of topology structure. High-frequency and push-pull forward converter is adopted in the front stage and single-phase full-bridge inverter is linked secondarily. Firstly, the working principles of push-pull forward converter and the photovoltaic inverter are analyzed...
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