Photo-assisted charging of carbon fiber paper-supported CeO2/MnO2 heterojunction and its long-lasting capacitance enhancement in dark

Abstract

It is important to develop green and sustainable approaches to enhance electrochemical charge storage efficiencies. Herein, a two-step in-situ growth process was developed to fabricate carbon fiber paper-supported CeO2/MnO2 composite (CeO2/MnO2—CFP) as a binder-free photo-electrode for the photo-assisted electrochemical charge storage. The formation of CeO2/MnO2 type II heterojunction largely enhanced the separation efficiency of photo-generated charge carriers, resulting in a substantially enhanced photo-assisted charging capability of ∼20%. Furthermore, it retained a large part of its photo-enhanced capacitance (∼56%) in dark even after the illumination was off for 12 h, which could be attributed to its slow release of stored photo-generated electrons from its specific band structure to avoid their reaction with O2 in dark. This study proposed the design principles for supercapacitors with both the photo-assisted charging capability and its long-lasting retainment in dark, which may be readily applied to other pseudocapacitive materials to better utilize solar energy.

Photo-assisted asymmetric supercapacitors based on dual photoelectrodes for enhanced photoelectric energy storage

“…Yang et al overcame this difficulty by synthesizing the CeO 2 /MnO 2 type II heterojunction. 16 It not only enhanced the photo-assisted charging capability as a binder-free photoelectrode, but also maintained more than half of the light-enhanced capacitance even after 12 hours of light irradiation. Recently, Momeni et al have prepared a MnO 2 –V 2 O 5 co-deposited WTiO 2 nanotube (WTNT) thin film electrode for photo-assisted supercapacitors.…”

Improvement in Electrochemical Performance of Waste Sugarcane Bagasse-Derived Carbon via Hybridization with SiO2 Nanospheres

“…Globally, fossil fuel consumption has led to an increase in energy demand and environmental sustainability [1][2][3]. Over the last few decades, a number of factors including population growth, fossil fuel exhaustion, and waste material production have contributed to the increasing demand for limitless energy sources and storage devices [4,5].…”

Rough and Porous Micropebbles of CeCu2Si2 for Energy Storage Applications

“…In the field of electrochemical energy storage (EES), supercapacitors have drawn increasing attention in addressing the emerging energy demand, primarily because of their plethora of advantages over conventional capacitors and batteries. These advantages encompass superior power densities, exceptional long-cycle lifespans, fast charge-discharge characteristics, adaptability to a wide range of temperatures, as well as improved ecofriendliness [2][3][4].…”