Electron Transfer in Heterojunctions Comprised of Co<sub>3</sub>O<sub>4</sub> Nanorods Decorated with CoP Nanoparticles for Electrocatalytic Water Splitting
Wenjuan Lü, Xiaodong Cai, Danhua Jiao, Tian-Tian Li, Weiwei Xu, Liangliang Xu, Yue Wang, Qizhao Wang
Abstract
Heterostructure design has been employed for electrocatalytic water splitting, nevertheless, the correlation between charge distribution at the active sites and the electrochemical processes remains ambiguous. In this study, bifunctional nanoarrayed CoP/Co 3 O 4 nanosheets on carbon cloth (CC) heterostructure nanoparticles were systematically synthesized to enhance electrical transmission at the interface. The CoP/Co 3 O 4 coupling CC substrate increases the electron transport efficiency and prevents catalyst aggregation and corrosion during catalytic operations. The synthesized materials exhibited expected hydrogen evolution reaction/oxygen evolution reaction (HER/OER) performance under alkaline circumstances, attaining 10 mA cm –2 with overpotentials of 58 and 273 mV, respectively. Meanwhile, just 1.61 V is required for the two-electrode configuration to attain 10 mA cm –2, exceeding earlier recorded Co 3 O 4 -based electrocatalysts. Experimental and density functional theory (DFT) studies confirm that CoOOH/Co 3 O 4 functions as the true active site for the reconstructive formation of CoP/Co 3 O 4, hence diminishing the adsorption energy of the intermediate and accelerating the reaction kinetics. This technique is anticipated to facilitate efficient charge transfer in water splitting and be applicable to other energy transformation processes.