1. Asphalt induced highly dispersed CoP/MoO2 heterojunction embedded in porous N-doped carbon for pH-universal water splitting.
- Author
-
Li, Guohua, Yang, Fan, Che, Sai, Liu, Hongchen, Chen, Neng, Qian, Jinxiu, Yu, Chunhui, Cheng, Jiating, Zhang, Xiaoyun, Li, Xi, and Li, Yongfeng
- Subjects
- *
GIBBS' free energy , *COBALT phosphide , *CHARGE exchange , *METAL-organic frameworks , *DOPING agents (Chemistry) - Abstract
Designing efficient water splitting electrocatalysts in pH-universal electrolytes is vital yet poses significant challenges. Here, the CoP/MoO 2 heterogeneous interface embedded in porous N-doped carbon (CoP/MoO 2 /NC) was designed by phosphating asphalt enwrapping polyoxometalate-based metal-organic frameworks (POM/ZIF67@asphalt). The CoP/MoO 2 /NC shows excellent performances with low overpotentials of 55, 50, 99 mV for HER and 194, 185, 285 mV for OER at 10mA·cm−2 current density in 1.0 M KOH, 0.5 M H 2 SO 4 , and 1.0 M PBS, respectively. Such superior performance can be attributed to the highly dispersed nanoparticles, heterogeneous interface effect of electron transfer from CoP to MoO 2 , and optimized Gibbs free energy. The long-time stabilities for over 24 h are ensured with negligible decline in all electrolytes, which can be attributed to the excellent stability of CoP/MoO 2 and the corrosion resistance of thin carbon layer. Additionally, in overall water splitting, the CoP/MoO 2 /NC only requires voltages of 1.53 V/1.52 V/1.67 V to gain 10 mA cm−2 in alkaline medium, acidic medium and neutral medium, which exceeded the most reported non-precious catalysts. This work exhibits the excellent pH-universal electrocatalysts with high activity and stability. [Display omitted] • CoP/MoO 2 heterojunction embedded in porous N-doped carbon was prepared by using petroleum pitch as carbon source. • The unique structure of CoP/MoO 2 /NC provided the highly dispersed nanoparticles. • CoP/MoO 2 /NC had excellent catalytic performances toward HER, OER and overall water splitting over a wide pH range. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF