Integrating a redox-coupled FeSe₂/N–C photoelectrode into potassium ion hybrid capacitors for photoassisted charging

Abstract

With a high-energy density and high-power output, potassium ion hybrid capacitors (PIHCs) are the promising next-generation energy storage devices. However, the poor K+ electrochemical of battery-type anodes remain a challenge...

Integrated Photovoltaic Charging and Energy Storage Systems: Mechanism, Optimization, and Future

“…During the photoassisted charging process, the photoexcited semiconductor, or photocatalyst generates electron-hole pairs, which can redox the cathode due to the high VB potential of the semiconductor or photocatalyst. [47,83,[143][144][145][146] On the other hand, photogenerated electrons can reduce the metal ions of the anode to metal elements and the oxidized cathode to a reduced state under the action of an external bias. [11,46,[147][148][149] For example, Zhou et al introduced a Pt/CdS photocatalyst into a polysulfide water cathode to form an integrated device to realize the conversion and storage of solar energy in LiBs, whose theoretical specific capacity is 3-5 times that of traditional LiBs (Figure 10a,b).…”

“…Resulting in a significant reduction of the reaction energy barrier by 35.7% (≈0.05 eV). [145] On this basis, in view of the synergistic enhancement of the lithiation kinetics and electrochemical reversibility of tin oxide and titania by electron-hole pairs under illumination, Hu et al Photoaccelerated rechargeable lithium-ion batteries with multifunctional anodes (Figure 10c). [1] The integrated multifunctional electrode achieves a significant increase in area specific capacity from 1.91 to 3.47 mAh at 5 mA cm −2 , and excellent performance without capacity loss for over 100 cycles (Figure 10d).…”

Recent Developments and Future Prospects of Transition Metal Compounds as Electrode Materials for Potassium‐Ion Hybrid Capacitors

“…Wang et al proposed a photoassisted charging PIHC (PA-PIHC). [87] A tailor-made nitrogen-carbon-doped FeSe 2 / Z907-dye/titania (FeSe 2 /N-C/Z907-dye/TiO 2 ) composite is used as an integrated photoelectrode. This unique photoelectrode can be used not only for photon capture, but also as an anode for electrochemical reactions.…”

Dimensional engineering of anode materials for high performance potassium ion hybrid capacitor—A review

“…Therefore, many works have focused on synthesizing electrode materials with higher stability, richer surface‐active sites, and larger specific surface area to reduce the severe impacts of large radius in PIHCs 9‐17 . Generally speaking, PIHC anode materials conforming to these characteristics can be divided into carbon materials and non‐carbon materials.…”

“…8 Therefore, many works have focused on synthesizing electrode materials with higher stability, richer surfaceactive sites, and larger specific surface area to reduce the severe impacts of large radius in PIHCs. [9][10][11][12][13][14][15][16][17] Generally speaking, PIHC anode materials conforming to these characteristics can be divided into carbon materials and non-carbon materials. Among them, carbon materials are divided into hard carbon 18,19 and soft carbon, 20,21 while non-carbon materials are composed of metal oxides, [22][23][24] metal sulfides 25,26 and some organic materials.…”