Rechargeable neutral aqueous zinc−air batteries (ZABs) are a promising type of energy storage device with longer operating life and less corrosiveness compared with conventional alkaline ZABs. However, the neutral ZABs normally possess poor oxygen evolution reactions (OERs) and oxygen reduction reactions performance, resulting in a large charge–discharge voltage gap and low round-trip efficiency. Herein, we demonstrate a sunlight-assisted strategy for achieving an ultralow voltage gap of 0.05 V in neutral ZABs by using the FeOOH-decorated BiVO 4 (Fe-BiVO 4 ) as an oxygen catalyst. Under sunlight, the electrons move from the valence band (VB) of Fe-BiVO 4 to the conduction band producing holes in VB to promote the OER process and hence reduce the overpotential. Meanwhile, the photopotential generated by the Fe-BiVO 4 compensates a part of the charging potential of neutral ZABs. Accordingly, the energy loss of the battery could be compensated via solar energy, leading to a record-low gap of 0.05 V between the charge and discharge voltage with a high round-trip efficiency of 94%. This work offers a simple but efficient pathway for solar-energy utilization in storage devices, further guiding the design of high energy efficiency of neutral aqueous ZABs.
Liu Xing,Li Wanying,Li Guoxing,Li Ting-Ting,Lou Ching-Wen,Lin Yan-Yu
Dopamine (DA) abnormality is closely linked to Parkinson’s and other neurodegenerative diseases. Establishing a sensitive and highly selective DA detection platform holds significant importance for clinical diagnosis and disease prevention. This study successfully prepared Fe–BiVO 4 /BiOCl-CF/FeOOH flexible composite electrode based on carbon fiber fabric (CF) substrates via electrospinning, hydrothermal synthesis and impregnation-in situ growth methods. Corresponding photoelectrochemical (PEC) sensors were constructed for quantitative DA detection. The Fe–BiVO 4 /BiOCl heterojunction significantly suppressed photogenerated carrier recombination. FeOOH, functioning as the hole transport layer, further optimized charge separation efficiency, while the three-dimensional porous structure of CF shortened the electron transport path and reduced electrical resistance. The constructed PEC sensor exhibits favorable sensing performance for DA in 0.1 M phosphate buffer (pH = 7.0). Within the concentration range of 1–40 μM, the photocurrent response shows an excellent linear correlation with DA concentration (R 2 = 0.99446), and the detection limit is determined to be 0.038 μM (3σ/S). Moreover, the sensor exhibits negligible interference from common coexisting substances and retains over 80% of its initial photocurrent efficiency after 11 days of continuous operation, demonstrating satisfactory selectivity and stability. This work provides a feasible strategy for constructing highly sensitive, portable PEC sensors for DA detection. Graphical
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