Reduced-graphene oxide/molybdenum oxide/polyaniline ternary composite for high energy density supercapacitors: Synthesis and properties

Abstract

Reduced-graphene oxide/molybdenum oxide/polyaniline ternary composites, RGO(MP), for use as electrode materials for high energy density supercapacitors, were firstly synthesized using a one-step method with Mo₃O₁₀(C₆H₈N)₂·2H₂O and graphene oxide (GO) as precursors. When the mass ratio of Mo₃O₁₀(C₆H₈N)₂·2H₂O to GO is 8 : 1, the resulting composite RGO(MP)₈ shows excellent electrochemical performance with a maximum specific capacitance of 553 F g⁻¹ in 1M H₂SO₄ and 363 F g⁻¹ in 1 M Na₂SO₄ at a scan rate of 1 mV s⁻¹. Its energy density reaches 76.8 W h kg⁻¹ at a power density of 276.3 W kg⁻¹, and 28.6 W h kg⁻¹ at a high power density of 10294.3 W kg⁻¹ in H₂SO₄. While in Na₂SO₄, the energy density achieves 72.6 W h Kg⁻¹ at a power density of 217.7 W kg⁻¹ and 13.3 W h Kg⁻¹ at power density of 3993.8 W kg⁻¹, respectively. The composite also presents good cycling stability (86.6, 73.4% at 20 mV s⁻¹ after 200 cycles in 1 M H₂SO₄ and Na₂SO₄, respectively).