Citation: Mingrui Guo, Jing Zhan, Zekun Wang, Xiaorui Wang, Zhang Dai, Ting Wang. Supercapacitors as redox mediators for decoupled water splitting[J]. Chinese Chemical Letters, ;2023, 34(2): 107709. doi: 10.1016/j.cclet.2022.07.052 shu

Supercapacitors as redox mediators for decoupled water splitting

Mingrui Guo ^{a, 1,} ,
Jing Zhan ^{b, 1} ,
Zekun Wang ^b ,
Xiaorui Wang ^c ,
Zhang Dai ^b ,
Ting Wang ^{b, *,}

a.
College of Chemistry and Chemical Engineering, Institute for Sustainable Energy and Resources, Qingdao University, Qingdao 266071, China
b.
National Engineering Research Center for Colloidal Materials, School of Chemistry and Chemical Engineering, Shandong University, Ji'nan 250100, China
c.
Shandong Shengtong Optical Materials Technology Co., Ltd., Dongying 257500, China

gmrqddx@qdu.edu.cn

t54wang@sdu.edu.cn

Received Date: 13 July 2022
Accepted Date: 26 July 2022
Available Online: 28 July 2022

Figures(4)

With the help of the redox mediator, decoupled water-splitting allows O₂ and H₂ to be produced at different times, at different rates, and even in different cells, which promotes both the operation safety and the utilization of renewable power sources. However, the current densities and stabilities of these redox mediators are commonly low, which require further improvements for practical applications. Here, we propose to use supercapacitors as solid state redox mediators for decoupled water splitting. For demonstration, Na_0.5MnO₂ (pseudocapacitor) and active carbon (double layer capacitor), are both used as the redox mediator. These supercapacitors show superior current density (1 A/cm²) and ultralong cycle-life (8000 cycles) compared with commonly investigated battery-based mediators (NiOOH/Ni(OH)₂). Our research proves supercapacitors can be used as redox relay with high current density and stability, which may bring new insights in the design of decoupled water splitting systems.
- Decoupled water splitting,
- Redox mediators,
- Supercapacitors,
- High current density,
- Ultralong cycle-life
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