Electrolytic water splitting with evolution of both hydrogen (HER) and oxygen (OER) is an attractive way to produce clean energy hydrogen. It is critical to explore effective, but low-cost electrocatalysts for the evolution of oxygen (OER) owing to its sluggish kinetics for practical applications. Fe-based catalysts have advantages over Ni- and Co-based materials because of low costs, abundance of raw materials, and environmental issues. However, their inefficiency as OER catalysts has caused them to receive little attention. Herein, the FeS2/C catalyst with porous nanostructure was synthesized with rational design via thein situelectrochemical activation method, which serves as a good catalytic reaction in the OER process. The FeS2/C catalyst delivers overpotential values of only 291 mV and 338 mV current densities of 10 mA/cm2and 50 mA/cm2, respectively, after electrochemical activation, and exhibits staying power for 15 h.
In this paper, we describe a novel and high-yield strategy to fabricate high-purity carbon nanocoils (CNCs) with Cu nanoparticles as catalysts produced by atomic layer deposition (ALD). The pristine CNCs display uniform structure and are rich of abundant functional groups, which is more beneficial to achieve high content of nitrogen doping. The high-content nitrogen-doped CNC exhibits improved electrical double-layer capacitive properties (143 F g −1 at 0.5 A g −1 ) over previously reported CNC-based electrode materials. Moreover, the carbonized CNC can act as conductive matrix to promote the electrochemical performance of metal oxides . The prepared NiO/CNC composites show high specific capacity (430 C g −1 at 1 A g −1 ), super rate capability and outstanding cycling stability. Ultimately, A hybrid supercapacitor assembled by using N-doping CNC as negative electrode and NiO/CNC as positive electrode , delivers a high energy density of 17.54 W h kg −1 at a power density of 849.56 W kg −1 and a high power density of 12.74 kW kg −1 at an energy density of 7.47 W h kg −1 , along with desirable cycling lifetime. This work suggests that CNCs have great potential for the electrochemical energy storage devices.
危险品化学品经营许可证（带存储）