Owing to its superior properties and versatility, graphene has been proliferating the energy research scene in the past decade. In this contribution, nitrogen (N-) and boron (B-) doped reduced graphene oxide (rGO) variants were investigated as a sole photocatalyst for the green production of H and their properties with respect to photocatalysis were elucidated for the first time. N- and B-rGOs were facilely prepared via the pyrolysis of graphene oxide with urea and boron anhydride as their respective dopant source. The pyrolysis temperature was varied (600-800 °C for N-rGO and 800-1000 °C for B-rGO) in order to modify dopant loading percentage (%) which was found to be influential to photocatalytic activity. N-rGO600 (8.26 N at%) and B-rGO1000 (3.59 B at%), which holds the highest at% from each of their party, exhibited the highest H activity. Additionally, the effects of the nature of N and B bonding configuration in H photoactivity were also examined. This study demonstrates the importance of dopant atoms in graphene, rendering doping as an effective strategy to bolster photocatalytic activity for standalone graphene derivative photocatalysts.
In
shaping a clean and green energy environment, the installation of
a self-rechargeable supercapacitor in an electric vehicle has the
goal of decreasing the emission of unwanted gases, which can be realized
by adopting a perovskite solar cell for self-charging the supercapacitor.
In this work, a CsPbBr2.9I0.1 perovskite-sensitized
solar cell is integrated for the first time with an asymmetrical supercapacitor
for a photo-supercapacitor application. Prior to this integration,
the performances of the perovskite-sensitized solar cell and supercapacitor
are individually examined. The perovskite-sensitized solar cell displays
a good efficiency, with the ability to retain 70% of its efficiency
after a week of storage in a dark humidity-controlled desiccator and
33% of its efficiency under UV and air exposure at a high relative
humidity of more than 80% for 24 h. The asymmetrical supercapacitor
exhibits a high areal capacitance of 150 mF cm–2 with a capacitance loss of only 4% after continuous cyclic performances,
which shows its potential for the photo-supercapacitor application.
The photo-supercapacitor device is sensitive to light, with the photovoltage
and photocurrent plunging to zero in the absence of light, and provides
an areal capacitance of 30 mF cm–2. It thus unlocks
opportunities for photo-supercapacitor applications in line with green
energy development.
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