Cobalt phosphide@S-doped carbon nanobelt arrays derived from metal-organic framework as an efficient bifunctional electrocatalyst for water splitting

Designing highly efficient and cost-effective bifunctional electrocatalyst capable of simultaneously driving hydrogen evolution (HER) and oxygen evolution (OER) reactions is critical for advancing water-splitting technologies. Herein, Co-based thiophene dicarboxylate (Co-TDC) frameworks were fabricated on nickel foam (NF) via a solvothermal approach, followed by low-temperature calcination and subsequent phosphorization to produce Co 2 P@S-doped carbon (Co 2 P@SC) composites. The as-prepared Co 2 P@SC exhibited high electrocatalytic performances with low overpotentials of 78 and 242 mV at 10 mA cm −2 for HER and OER, respectively. Additionally, the water electrolytic cell assembled with Co 2 P@SC as a bifunctional electrocatalyst demonstrates exceptional performance, requiring only 1.57 V to achieve a current density of 10 mA cm −2 , which highlights its outstanding overall water-splitting efficiency. This paper presents a novel approach to fabricate MOFs-derived bifunctional electrocatalysts for high-efficiency overall water splitting.