Details

Autor(en) / Beteiligte

• Zheng, Cheng-bin
• Du, Ze-chen
• Li, Jia-ke
• Jiang, He-dong
• Liu, Xin
• Guo, Ping-chun
• Zhu, Hua
• Wang, Yan-xiang

Titel

Preparation of aqueous zinc ion rGH/BiVO4 photorechargeable integrated supercapacitor

Ist Teil von

• Journal of energy storage, 2024-07, Vol.92, p.112204, Article 112204

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2024

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The development of industrialization has increased the prominence of the gradual consumption of non-renewable resources and the environmental problems due to fossil fuels, gradually increasing the use of solar energy. Therefore, converting solar energy into electric energy through energy collection and storage systems and its applications have become a research hotspot in recent years. This study constructed a novel all-in-one photorechargeable supercapacitor using bismuth vanadate (BiVO4), reduced graphene oxide hydrogel (rGH), and Zn (CF3SO3)2 as photoanode, cathode, and electrolyte, respectively. Consequently, the device exhibits a 309.3 F/g high capacitance at 0.1 A g−1 under illumination with 95 mW cm−2 light intensity, 26.3 % higher than normal electric charging, and the supercapacitor has a 100 % capacity retention rate after 10,000 testing cycles under photoelectric synergistic charging and discharging. The as-constructed supercapacitor integrated with solar energy collection and electrochemical energy storage has potential applications in wearable electronic products and other fields. •Preparation of high quality BiVO4 powder m-BiVO4 powder with perfect crystal structure and strong light absorption ability was prepared by hydrothermal method. The phase composition, morphology, and light absorption ability were analyzed by XRD, SEM,HR-TEM,XPS and UV-Vis, and the results showed that the as-prepared m-BiVO4 has a rod-like structure and 2.39 eV of bandgap, which increased light absorption ability.•Preparation of high performance BiVO4 photoanode BiVO4 photoanode was prepared by spin-coating method, which had a good photoelectrochemical performance by single electrode test. The specific capacitance was 416 mF.g-1 and 96.3 mF.g-1 with and without illumination, respectively.•Preparation of reduced graphene oxide hydrogel (rGH) with micro/ mesoporous-structure and higher specific surface area rGH was prepared by the improved Hummers and hydrothermal method, and the as-prepared rGH had a 11.84 nm of average pore size and 258.9 m2/g of specific surface area, which could accelerate the ion diffusion rate, and increased the capacitance and rate performance of the supercapacitor.•The as-constructed rGH/BiVO4 exhibited a 309.3 F.g−1 high capacitance at 0.1 A.g−1 under illumination with 95 mW.cm−2 light intensity, 26.3 % higher than normal electrical charging. The supercapacitor had a 100 % capacitance retention rate after 10000 testing cycles under photoelectric synergistic charging and discharging.•The mechanism of different charging modes was systematically investigated. The supercapacitor was charged under the condition of electrical charging, photocharging, and photoelectrical synergistic charging were systematically investigated by means of CV, GCD EIS, etc.