High-performance overall water splitting based on amorphous iron doped cobalt tungstate via facile co-precipitation

Exploring high-performance and low-cost bifunctional electrocatalysts is crucial for developing highly efficient overall water splitting cells. In this work, a facile and cheap co-precipitation method, which is compatible with large-scale production, is applied to prepare amorphous Fe-doped CoWO 4 b...

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Published inJournal of materials chemistry. A, Materials for energy and sustainability Vol. 9; no. 15; pp. 9753 - 9760
Main Authors Wu, Jin, Xie, Renjie, Hu, Xiangchen, Nie, Zhiwei, Shi, Yanuo, Yu, Yi, Yang, Nan
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 01.01.2021
Subjects
Chemical precipitation
Cobalt
Coprecipitation
Current density
Electrocatalysts
Iron
Splitting
Water splitting
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Summary:Exploring high-performance and low-cost bifunctional electrocatalysts is crucial for developing highly efficient overall water splitting cells. In this work, a facile and cheap co-precipitation method, which is compatible with large-scale production, is applied to prepare amorphous Fe-doped CoWO 4 bifunctional electrocatalysts. Low overpotentials of 259 and 118 mV to reach a current density of 10 mA cm −2 for the OER and HER in 1 M KOH are found, respectively. Moreover, no detectable potential decay is observed at 50 mA cm −2 for at least 15 h, revealing its excellent long-term stability. Finally, a highly efficient overall water splitting cell is assembled with amorphous Fe-doped CoWO 4 as a bifunctional electrocatalyst. A low cell voltage of 1.55 V is required to achieve a current density of 10 mA cm −2 , which surpasses the benchmark IrO 2 ‖Pt/C cell.
ISSN:2050-7488
2050-7496
DOI:10.1039/D1TA00001B