Engineered CoS/Ni<sub>3</sub>S<sub>2</sub> Heterointerface Catalysts Grown Directly on Carbon Paper as an Efficient Electrocatalyst for Urea Oxidation
Saba A. Aladeemy,
Prabhakarn Arunachalam,
Abdullah M. Al-Mayouf,
P. N. Sudha,
A. Rekha,
A. Vidhya,
J. Hemapriya,
Srinivasan Latha,
P. Supriya Prasad,
S. Pavithra,
Raja Arunadevi,
Salah T. Hameed
Affiliations
Saba A. Aladeemy
Chemistry Department, College of Science and Humanities, Prince Sattam Ben Abdul-Aziz University, Al-Kharj 11942, Saudi Arabia
Prabhakarn Arunachalam
Electrochemical Sciences Research Chair, Department of Chemistry, Science College, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
Abdullah M. Al-Mayouf
Electrochemical Sciences Research Chair, Department of Chemistry, Science College, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
P. N. Sudha
Department of Physiology, Saveetha Dental College & Hospitals, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha University, Chennai 600077, India
A. Rekha
Department of Microbiology, DKM College for Women (Autonomous), Vellore 632001, India
A. Vidhya
Department of Microbiology, DKM College for Women (Autonomous), Vellore 632001, India
J. Hemapriya
Department of Microbiology, DKM College for Women (Autonomous), Vellore 632001, India
Srinivasan Latha
Department of Chemistry, Vellore Institute of Technology, Vellore 632014, India
P. Supriya Prasad
Department of Chemistry, Muthurangam Government Arts College (Autonomous), Vellore 632002, India
S. Pavithra
Department of Chemistry, Muthurangam Government Arts College (Autonomous), Vellore 632002, India
Raja Arunadevi
Department of Chemistry, Muthurangam Government Arts College (Autonomous), Vellore 632002, India
Salah T. Hameed
Physics Department, Faculty of Education, Taiz University, Taiz 12372, Yemen
Developing highly efficient and stable electrocatalysts for urea electro-oxidation reactions (UORs) will improve wastewater treatment and energy conversion. A low-cost cobalt sulfide-anchored nickel sulfide electrode (CoS/Ni3S2@CP) was synthesized by electrodeposition in DMSO solutions and found to be highly effective and long-lasting. The morphology and composition of catalyst surfaces were examined using comprehensive physicochemical and electrochemical characterization. Specifically, CoS/Ni3S2@CP electrodes require a potential of 1.52 volts for a 50 mA/cm2 current, confirming CoS in the heterointerface CoS/Ni3S2@CP catalyst. Further, the optimized CoS/Ni3S2@CP catalyst shows a decrease of 100 mV in the onset potential (1.32 VRHE) for UORs compared to bare Ni3S2@CP catalysts (1.42 VRHE), demonstrating much greater performance of UORs. As compared to Ni3S2@CP, CoS/Ni3S2@CP exhibits twofold greater UOR efficiency as a result of a larger electroactive surface area. The results obtained indicate that the synthetic CoS/Ni3S2@CP catalyst may be a favorable electrode material for managing urea-rich wastewater and generating H2.
