Silver decorated graphene nanocomposites toward electrochemical energy storage

Highlights: • Silver decorated graphene nanocomposites are designed. • Electrical conductivity has been improved. • Restacking effect has been alleviated. • Efficient energy storage materials. • The synthesis method is versatile to other materials. Two-dimensional graphene materials have presented great potential as electrode materials for electrochemical energy storage. But the restacking effect accompanying limited electrical conductivity impedes further applications. Here, we reported silver nanoparticles decorated graphene composites as electrode materials for efficient electrochemical energy storage. Silver nanoparticles distributed uniformly onto graphene layers will improve the electrical conductivity and alleviate restacking effect as well. As a result, the nanocomposites based electrode gives a high specific capacity of 114 F g⁻¹, which is 3.6 times higher than that of pristine graphene. The symmetric cell displays high energy capacity with excellent cycling stability over 5000 charge–discharge cycles.