Metal-Substituted Zirconium Diboride (Zr1-xTMxB2; TM = Ni, Co, and Fe) as Low-Cost and High-Performance Bifunctional Electrocatalyst for Water Splitting
Low-cost, high-performance coatings for hydrogen production via electrolytic water-splitting are of great importance for de-carbonising energy. In this study the Raney2.0 coating was analysed using various electrochemical techniques to assess its absolute performance, and it was confirmed to have an extremely low overpotential for hydrogen evolution of just 28 mV at 10 mA/cm2. It was also confirmed to be an acceptable catalyst for oxygen evolution, making it the highest performing simple bifunctional electrocatalyst known. The coating exhibits an extremely high capacitance of up to 1.7 F/cm2, as well as being able to store 0.61 J/cm2 in the form of temporary hydride deposits. A new technique is presented that performs a best-fit of a transient simulation of an equivalent circuit containing a constant phase element to cyclic voltammetry measurements. From this the roughness factor of the coating was calculated to be approximately 40,000, which is the highest figure ever reported for this type of material. The coating is therefore an extremely useful improved bifunctional coating for the continued roll-out of alkaline electrolysis for large-scale renewable energy capture via hydrogen production.
Electrocatalysts play an important role in fuel cells, metal-air battery and water-splitting devices. The development of low cost, high activity and high performance bifunctional electrocatalysts for ORR and OER is...
Designing cost-effective bifunctional catalysts with high-performance and durability is of great significance for the renewable energy systems. Herein, a typical Fe, Ni-codoped W18O49/NF was prepared via a simple solvothermal method....
Ni–Co–Fe mixed sulfide ultrathin nanosheets obtained by electrodeposition method exhibits excellent electrocatalytic activity. The Ni–Co–Fe nanosheets require the overpotential of 106 and 207 mV to generate 10 mA cm−2 current density for the HER, and OER, respectively.
A family of catalytic electrodes fabricated by insulating substrates of paper, cloth and sponge which bring dramatic advantages of high performance, low cost, light weight, eco-friendliness, flexibility, and simple fabrication, were developed.
Non-precious metal-based electrocatalysts with high activity and stability for efficient hydrogen evolution reactions are of critical importance for low-cost and large-scale water splitting.
Study of Activity and Super-Capacitance Exhibited by Bifunctional Raney 2.0 Catalyst for Alkaline Water-Splitting Electrolysis