Unraveling the roles of mesoporous TiO2 framework in CH3NH3PbI3 perovskite solar cells

Mesoporous TiO2 layer suppresses ion accumulation in perovskite solar cells

“…3,4 The original purpose of applying the mesoporous TiO 2 (m-TiO 2 ) layer was to promote the photogenerated charge separation, as inherited from the idea used for dye-sensitized solar cells, 5,6 while it seems to play a trade-off role in the photovoltaic performance of PSCs. For example, the m-TiO 2 structure is beneficial to electron collection by increasing the contact area between the perovskite layer and the ETL, 7,8 while it at the same time brings more trap states, 9,10 which not only hinders charge transport but also exacerbates non-radiative charge recombination. Readers interested in the role of the m-TiO 2 layer in the key photoelectric conversion processes of PSCs are directed to our previous work.…”

N/O co-enriched graphene hydrogels as high-performance electrodes for aqueous symmetric supercapacitors

“…In order to cope with the increasingly serious environmental pollution and get rid of the dependence on fossil energy, human beings have developed many new energy sources, such as tidal energy, solar energy, geothermal energy and so on. [1][2][3][4] However, generation of electricity from these new energy sources is vulnerable to external conditions such as climate and weather. Therefore, in the new energy power generation equipment, it is usually necessary to equip corresponding energy storage devices to store excess electricity when the power is abundant and release electricity when the power generation is insufficient.…”

Corn Stalk-Based Carbon Microsphere/Reduced Graphene Oxide Composite Hydrogels for High-Performance Symmetric Supercapacitors

“…With the increasingly fast development of the economy, people’s demand for energy is far greater than that before. The current shortage of fossil energy has forced people to look for new clean energy sources. − However, due to the dispersion and instability of these energy sources, the development of new energy storage devices has become an urgent problem to be solved today. Aside from fuel cells and chemical batteries, supercapacitors have emerged as a new energy storage device as they commonly have a very high-power density, fast discharge time, good cycling stability, and low cost. − Due to the different energy storage mechanisms of cells, supercapacitors can be divided into electrical double-layer capacitors (EDLCs) , and pseudocapacitors.…”