期刊
ACS APPLIED ENERGY MATERIALS
卷 1, 期 3, 页码 1200-+出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.7b00305
关键词
Co0.4Fe0.6 LDH; g-carbon nitride; oxygen evolution reaction (OER); hydrogen evolution reaction (HER); overall water splitting
资金
- Department of Atomic Energy (DAE), India
- NISER, Bhubaneswar
Finding nonprecious metal based highly active and durable bifunctional electrocatalysts for overall water-splitting is essential for the development of various renewable energy storage and conversion technologies. Herein, we report the synthesis of cobalt iron layered double hydroxide (Co1-delta Fe delta LDH) and g-carbon nitride composite (Co1-delta Fe delta LDH/g-CNx) for alkaline water electrolysis. The thin Co1-delta Fe delta LDH nanosheets are successfully impregnated on graphitic carbon nitride surface by one pot co-precipitation method at ambient temperature. The optimal composite, Co0.4Fe0.6 LDH/g-CNx exhibited superior OER activity in 1 M KOH electrolyte with a small overpotential of 0.28 V for 10 mA cm(-2), low Tafel slope of 29 mV/dec, 100% faradic efficiency, and high TOF of 0.25 s(-1) which is superior to commercial (comm) IrO2. Furthermore, the Co0.4Fe0.6 LDH/g-CNx composite also exhibited remarkable HER activity in alkaline media and its HER activity is slightly lower than that of comm Pt/C at low overpotential but it outperforms Pt/C at high overpotential. The catalyst demonstrated its long-term durability and higher stability for HER and OER under alkaline environment. This Co0.4Fe0.6 LDH/g-CNx catalyst can serve as both cathode and anode for overall water-splitting and required the small potential of 1.61 V to achieve a current density of 10 mA cm(-2). The superior electrocatalytic activities of the Co0.4Fe0.6 LDH/g-CNx composite are due to the high electrochemical surface area (ECSA), easy access of abundant active sites, and easy mass transport owing to 2D sheet morphology of the composite.
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