@article{Li2023, 
author = {Xiaojie Li and Huike Zhang and Xuan Li and Qi Hu and Chen Deng and Xingxing Jiang and Hengpan Yang and Chuanxin He},
title = {Janus heterostructure of cobalt and iron oxide as dual-functional electrocatalysts for overall water splitting},
year = {2023},
journal = {Nano Research},
volume = {16},
number = {2},
pages = {2245-2251},
keywords = {Janus, bifunctional, electrocatalytic, water splitting, CoFe},
url = {https://www.sciopen.com/article/10.1007/s12274-022-5024-9},
doi = {10.1007/s12274-022-5024-9},
abstract = {In electrocatalytic water splitting, low-cost dual-functional catalysts can not only reduce costs but also avoid cross-contamination of cathode and anode. However, the orderly aggregation of active sites for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) into a specific catalyst is very challenging. In this study, a Co/Fe3O4 Janus heterojunction supported on carbon fiber paper (J-CoFe-CFP) is designed and successfully synthesized. Generally, Co-Fe oxides have preferable OER activity but weak HER activity. However, in J-CoFe-CFP, due to the intense and special electronic interaction of different substances (Co and Fe3O4) in the Janus heterogeneous interface, a huge number of tidy high-quality HER and OER active sites are uniformly distributed on the interface simultaneously, which endows the catalyst with both excellent HER and OER performance. In HER, the overpotential @10 mA·cm−2 (ηHER) is only 53.9 mV, and the Tafel slope is 43.7 mV·dec−1. In OER, the η is 272 mV, and the Tafel slope is 50.2 mV·dec−1, much lower than those of RuO2/CFP. In the J-CoFe-CFP||J-CoFe-CFP two-electrode system, the required voltage is only 1.26 V at the beginning and 1.56 V@10 mA·cm−2, much lower than those of RuO2/CFP||20% Pt/C/CFP. This work provides a Janus heterojunction pathway for bifunctional water electrolysis catalysts.}
}