Corrosive engineering assistedin situconstruction of an Fe–Ni-based compound for industrial overall water-splitting under large-current density in alkaline freshwater and seawater media

Abstract

As a practical approach for hydrogen generation, electrolysis water-splitting, particularly in seawater, is considered an attractive technique. Herein, Fe-Ni based compound onto NiFe foam (Fe-Ni-O-N) is in-situ engineered via ambient...

Materials Design and System Innovation for Direct and Indirect Seawater Electrolysis

“…In order to achieve efficient seawater electrolysis, it is of great significance to explore and regulate anode reactions. − Considering the equilibrium potential gap between OER and CER, , a series of approaches have been developed to prevent the formation of toxic Cl 2 or chlorine oxide and achieve high OER selectivity, especially at high current densities. Specifically, several key aspects need to be considered when designing anode catalysts for seawater electrolysis.…”

Electronic Reallocation in MOF-Derived Co4N–Ni3N Heterostructure Renders Chlorine-Free Overall Seawater Splitting under Large Current Density

“…These advantages include the usage of the most prevalent seawater resource on earth (∼97%) and the preservation of freshwater, which is only 1% of the earth’s water. These advantages have endowed seawater electrolysis with substantial increasing and enticing research interest. − To make the electrolysis of seawater more effortless, power efficient, and economically viable, we need to design inexpensive electrocatalysts that are generated from earth-abundant elements for speeding up the anodic OER and cathodic HER. − For the generation of hydrogen at the industrial scale, we need an electrocatalyst that can generate up to 500 mA cm –2 at low overpotentials. , Regardless, the polarization phenomenon that occurs at the electrodes and causes larger overpotentials, particularly at larger current densities, will cause the chlorine evolution reaction (ClER) to form hypochlorite (ClO – ) in natural seawater (0.5 M). This would start competing with the anodic oxygen evolution reaction, which would lead to a decrease in the effectiveness of electrolysis of seawater and fast inactivation. , In 1.0 M KOH, the theoretical potential for ClER is approximately 480 mV higher than OER.…”

One-step hydrothermal synthesis of Se-doped NiTe electrocatalysts for efficient hydrogen production from saline water assisted by anodic iodide oxidation

“…5 For example, Wang et al used the one-step corrosion strategy to prepare NiFe-LDH and then obtained Fe–Ni–O–N electrocatalysts through low-temperature nitridation, which needed an overpotential of only 260 mV to deliver 500 mA cm −2 for the OER in alkaline seawater, successfully circumventing the CER. 6 Yu and co-workers designed self-supported nickel-iron phosphosulfide nanotube arrays with abundant heterointerfaces and under-coordinated metal active sites, 7 achieving similar OER performance in alkaline-saline electrolyte. In addition, Yang et al reported Fe and P co-doped NiSe 2 nanoporous films (Fe, P-NiSe 2 NFs) as bifunctional catalysts to produce hydrogen via direct seawater electrolysis, where P doping improves electronic conductivity and prevents the dissolution of selenide by forming a passivation layer composed of P–O species, and Fe acts as the main active site of the cathodic hydrogen evolution reaction (HER) and simultaneously synergizes with the adjacent Ni atoms for the OER.…”