Construction of a hierarchical 3D Co/N-carbon electrocatalyst for efficient oxygen reduction and overall water splitting

Exploration of a highly efficient and multifunctional electrocatalytic material is crucial for renewable energy technologies. Herein, by studying a multidimensional and multifunctional Co/N-C catalyst, we have demonstrated that two categories of preferential characteristics, i.e. activity distinctions between different reactions and feature distinctions between component and structure aspects, for electrocatalysts are not mutually exclusive, but can be well-addressed simultaneously. This rationally designed and cost-effective hybrid catalyst synergically integrates the features, including ample active species, prompt mass transport, excellent conductivity, and structural stability in both acidic and alkaline electrolytes, for an efficient and versatile electrocatalyst. The thus-obtained multidimensional catalyst delivers excellent activities in oxygen reduction and overall water-splitting reactions in conjunction with a good durability, which then enables a prominent performance in a rechargeable Zn-air battery and also demonstrates feasibility in a self-powered water-splitting unit. This study opens up new avenues for the rational design and easy fabrication of multidimensional catalysts with desired performances for various renewable energy applications.