The development of efficient electrocatalysts from Earth-abundant elements for the oxygen evolution reaction (OER) is highly desired.Here,we report the electrodeposition of a NiCo layered double hydroxide nanosheet ar...The development of efficient electrocatalysts from Earth-abundant elements for the oxygen evolution reaction (OER) is highly desired.Here,we report the electrodeposition of a NiCo layered double hydroxide nanosheet array on graphite felt (NiCo LDHs/GF) as a 3D OER electrocatalyst.Such NiCo LDHs/GF exhibits superior electrocatalytic activity with the need for an overpotential of 249 mV to drive a current density of 20 mA cm^(-2) in 1.0 M KOH.It also shows strong long-term electrochemical durability with its activity being maintained for at least 24 h.展开更多
Renewable electricity-driven seawater electrolysis for hydrogen production offers substantial potential for sustainable energy solutions.However,the high concentration of chloride ions(Cl-)in seawater triggers competi...Renewable electricity-driven seawater electrolysis for hydrogen production offers substantial potential for sustainable energy solutions.However,the high concentration of chloride ions(Cl-)in seawater triggers competitive chemical reactions and severe corrosion,posing a challenge to the durability of the anode.In this study,we present a hexafluoroantimonate-intercalated NiFe layered double hydroxide nanosheet array on Ni foam(SbF_(6)^(-)-NiFe LDH/NF),which serves as a highly active and stable electrocatalyst for alkaline seawater oxidation(ASO).SbF_(6)^(-)-NiFe LDH/NF requires only an overpotential of 379 mV to achieve a current density of 1000 mA cm^(-2),significantly outperforming NiFe LDH/NF(396 mV).Furthermore,it exhibits excellent long-term stability over 600 hours at 1000 mA cm^(-2),with only trace amounts of active chlorine detected during the ASO process.In situ Raman spectroscopy confirms that the insertion of SbF_(6)^(-)into the LDH layers promotes the formation of active sites.More importantly,SbF_(6)^(-)efficiently repels Cl-,thus providing robust protection to the anode.This development represents a significant advancement in the design of noble-metal-free,durable anode electrodes for ASO.展开更多
Seawater electrolysis for green hydrogen production is a promising approach toward achieving carbon neutrality.However,the abundance of Cl^(−)in seawater can severely corrode catalytic sites,significantly reducing the...Seawater electrolysis for green hydrogen production is a promising approach toward achieving carbon neutrality.However,the abundance of Cl^(−)in seawater can severely corrode catalytic sites,significantly reducing the lifespan of seawater electrolysis systems.Herein,we present metal ion-chelated tannic acid nanoparticles anchored on the CoFe layered double hydroxide nanosheet array on nickel foam(CoFe LDH@CoFe-TA/NF),synthesized via an interfacial coordination assembly method,serving as an efficient and stable electrocatalyst for alkaline seawater oxidation(ASO).The formed CoFe-TA nanoparticles promote the transformation of Co^(3+)into the more robust acid Co^(4+),thereby favoring the adsorption of the hard base OH^(−)rather than the soft base Cl^(−).In addition,the CoFe-TA ligand network effectively inhibits metal ion leaching and stabilizes active sites.As a result,the CoFe LDH@CoFe-TA/NF electrode requires a low overpotential of only 379 mV to obtain a current density of 1000 mA cm^(−2)in 1 M KOH+seawater.Furthermore,the electrode also shows a stable operation for 450 h at an industrial-level current density,underscoring its potential for sustainable energy applications.展开更多
基金supported by the National Natural Science Foundation of China(no.22072015).
文摘The development of efficient electrocatalysts from Earth-abundant elements for the oxygen evolution reaction (OER) is highly desired.Here,we report the electrodeposition of a NiCo layered double hydroxide nanosheet array on graphite felt (NiCo LDHs/GF) as a 3D OER electrocatalyst.Such NiCo LDHs/GF exhibits superior electrocatalytic activity with the need for an overpotential of 249 mV to drive a current density of 20 mA cm^(-2) in 1.0 M KOH.It also shows strong long-term electrochemical durability with its activity being maintained for at least 24 h.
基金appreciation to the Deanship of Research and Graduate Studies at King Khalid University for funding this work through Large Research Project under Grant number RGP2/28/46.
文摘Renewable electricity-driven seawater electrolysis for hydrogen production offers substantial potential for sustainable energy solutions.However,the high concentration of chloride ions(Cl-)in seawater triggers competitive chemical reactions and severe corrosion,posing a challenge to the durability of the anode.In this study,we present a hexafluoroantimonate-intercalated NiFe layered double hydroxide nanosheet array on Ni foam(SbF_(6)^(-)-NiFe LDH/NF),which serves as a highly active and stable electrocatalyst for alkaline seawater oxidation(ASO).SbF_(6)^(-)-NiFe LDH/NF requires only an overpotential of 379 mV to achieve a current density of 1000 mA cm^(-2),significantly outperforming NiFe LDH/NF(396 mV).Furthermore,it exhibits excellent long-term stability over 600 hours at 1000 mA cm^(-2),with only trace amounts of active chlorine detected during the ASO process.In situ Raman spectroscopy confirms that the insertion of SbF_(6)^(-)into the LDH layers promotes the formation of active sites.More importantly,SbF_(6)^(-)efficiently repels Cl-,thus providing robust protection to the anode.This development represents a significant advancement in the design of noble-metal-free,durable anode electrodes for ASO.
基金the Deanship of Scientific Research at King Khalid University for funding support through a large group research project under Grant No.RGP2/119/45.
文摘Seawater electrolysis for green hydrogen production is a promising approach toward achieving carbon neutrality.However,the abundance of Cl^(−)in seawater can severely corrode catalytic sites,significantly reducing the lifespan of seawater electrolysis systems.Herein,we present metal ion-chelated tannic acid nanoparticles anchored on the CoFe layered double hydroxide nanosheet array on nickel foam(CoFe LDH@CoFe-TA/NF),synthesized via an interfacial coordination assembly method,serving as an efficient and stable electrocatalyst for alkaline seawater oxidation(ASO).The formed CoFe-TA nanoparticles promote the transformation of Co^(3+)into the more robust acid Co^(4+),thereby favoring the adsorption of the hard base OH^(−)rather than the soft base Cl^(−).In addition,the CoFe-TA ligand network effectively inhibits metal ion leaching and stabilizes active sites.As a result,the CoFe LDH@CoFe-TA/NF electrode requires a low overpotential of only 379 mV to obtain a current density of 1000 mA cm^(−2)in 1 M KOH+seawater.Furthermore,the electrode also shows a stable operation for 450 h at an industrial-level current density,underscoring its potential for sustainable energy applications.
