Co2P2O7@MoO3/NF composite electrocatalysts by different phosphorus sources for efficient oxygen evolution reaction and overall water splitting
Tongtong Li, Wan Wan, Yali Cao, Jialing Xu, Hui Chai
Abstract
Electrocatalysts comprising MoO3 coated by Co2P2O7 nanocrystals were grown on a nickel foam (NF) substrate. The applicability of the nanocomposite material (Co2P2O7@MoO3/NF) as an electrode for the oxygen evolution reaction (OER) and overall water splitting was verified. The as-synthesized product showed the overpotentials of 227 and 377 mV to drive the OER at current densities of 50 and 100 mA cm−2, respectively. Furthermore, the voltage of Co2P2O7@MoO3/NF as a bifunctional overall water splitting catalyst was 1.55 V at 10 mA cm−2. Co2P2O7@MoO3/[email protected] (+)//Co2P2O7@MoO3/NF (−) can maintain >80% of its initial current density after 30 h at 15 mA cm−2. The Co2P2O7@MoO3/NF electrode also showed a low hydrogen evolution reaction overpotential of 58.7 mV at 10 mA cm−2. The excellent oxygen evolution and electrochemical water decomposition stability of the catalyst have broad application prospects.