A cobalt oxide–polypyrrole nanocomposite as an efficient and stable electrode material for electrocatalytic water oxidation

Abstract

Developing electrolyzers operating under neutral or near-neutral conditions with catalysts based only on earth-abundant metals is highly desirable with a view to reduce the cost of hydrogen production from water...

Nature-Inspired Design of Nano-Architecture-Aligned Ni5P4-Ni2P/NiS Arrays for Enhanced Electrocatalytic Activity of Hydrogen Evolution Reaction (HER)

“…It is also utilized to alter the CPE to a pure capacity, where the closer to 1, the more the capacitance behavior can appear. Indeed, it is believed that n varies with the homogeneous distribution of active catalytic sites . As shown in Figure c, we understand that the distribution of active sites varies with the applied overpotentials over the catalyst’s surface, in which the homogeneity reduces with the applied potentials indicating that the number of active catalytic sites depletes and then mitigates at higher overpotentials (above 300 mV).…”

“…Indeed, it is believed that n varies with the homogeneous distribution of active catalytic sites. 55 As shown in Figure 8c, we understand that the distribution of active sites varies with the applied overpotentials over the catalyst's surface, in which the homogeneity reduces with the applied potentials indicating that the number of active catalytic sites depletes and then mitigates at higher overpotentials (above 300 mV). In contrast, the CPE, representing the pseudo-capacitance of the formed double layer, increases with the applied potential until 300 mV, implying that the electron exchangeability rate over the active catalytic sites increases and then slightly reduces.…”

In situ construction of heterostructured CuxO@NiCoS nanoarrays for alkaline overall water splitting

“…[1][2][3] Hydrogen as a clean, eco-friendly and renewable energy has attracted widespread attention and is considered the most promising alternative to replace fossil resources in the future. [4][5][6] Water electrolysis is the most significant process for producing hydrogen energy due to the advantages of low cost, high efficiency, sustainability and environmental protection. [7][8][9][10][11][12] Precious metal materials possess excellent electrocatalytic activity in the eld of water electrolysis, however, the high cost and scarce resources limit their large-scale application in industry.…”