Abstract:The volume expansion of CoFe2O4 anode poses a significant challenge in the commercial application of lithium/sodium‐ion batteries (LIBs/SIBs). However, metal–organic‐frameworks (MOF) offer superior construction of heterostructures with refined interfacial interactions and lower ion diffusion barriers in Li/Na storage. In this study, the CoFe2O4@carbon nanofibers derived from MOF are produced through electrospinning, in situ growth followed by calcination, which are then confined within an MXene‐confined MOF‐de… Show more
“…Electrochemical performance of MXenes and their composites in (a) LIBs (refs , , , , , , , , − ), (b) SIBs (refs , , , , , , − , , , , − ), and (c) PIBs (refs , , − , − , , , ) based on the research from the past three years.…”
The development and optimization of promising anode material
for
next-generation alkali metal ion batteries are significant for clean
energy evolution. 2D MXenes have drawn extensive attention in electrochemical
energy storage applications, due to their multiple advantages including
excellent conductivity, robust mechanical properties, hydrophilicity
of its functional terminations, and outstanding electrochemical storage
capability. In this review, the categories, properties, and synthesis
methods of MXenes are first outlined. Furthermore, the latest research
and progress of MXenes and their composites in alkali metal ion storage
are also summarized comprehensively. A special emphasis is placed
on MXenes and their hybrids, ranging from material design and fabrication
to fundamental understanding of the alkali ion storage mechanisms
to battery performance optimization strategies. Lastly, the challenges
and personal perspectives of the future research of MXenes and their
composites for energy storage are presented.
“…Electrochemical performance of MXenes and their composites in (a) LIBs (refs , , , , , , , , − ), (b) SIBs (refs , , , , , , − , , , , − ), and (c) PIBs (refs , , − , − , , , ) based on the research from the past three years.…”
The development and optimization of promising anode material
for
next-generation alkali metal ion batteries are significant for clean
energy evolution. 2D MXenes have drawn extensive attention in electrochemical
energy storage applications, due to their multiple advantages including
excellent conductivity, robust mechanical properties, hydrophilicity
of its functional terminations, and outstanding electrochemical storage
capability. In this review, the categories, properties, and synthesis
methods of MXenes are first outlined. Furthermore, the latest research
and progress of MXenes and their composites in alkali metal ion storage
are also summarized comprehensively. A special emphasis is placed
on MXenes and their hybrids, ranging from material design and fabrication
to fundamental understanding of the alkali ion storage mechanisms
to battery performance optimization strategies. Lastly, the challenges
and personal perspectives of the future research of MXenes and their
composites for energy storage are presented.
Tandem nitrate electroreduction reaction (NO3‐RR) is a promising method for green ammonia (NH3) synthesis. However, the mismatched kinetics processes between NO3‐‐to‐NO2‐ and NO2‐‐to‐NH3 results in poor selectivity for NH3 and excess NO2‐ evolution in electrolyte solution. Herein, a Ni2+ substitution strategy for developing oxide heterostructure in Co/Fe layered double oxides (LDOs) was designed and employed as tandem electrocataltysts for NO3‐RR. (Co0.83Ni0.16)2Fe exhibited a high NH3 yield rate of 50.4 mg·cm‐2·h‐1 with a Faradaic efficiency of 97.8% at ‐0.42 V vs. reversible hydrogen electrode (RHE) in a pulsed electrolysis test. By combining with in situ/operando characterization technologies and theoretical calculations, we observed the strong selectivity of NH3 evolution over (Co0.83Ni0.16)2Fe, with Ni playing a dual role in NO3‐RR by i) modifying the electronic behavior of Co, and ii) serving as complementary site for active hydrogen (*H) supply. Therefore, the adsorption capacity of *NO2 and its subsequent hydrogenation on the Co sites became more thermodynamically feasible. This study shows that Ni substitution promotes the kinetics of the NO3‐RR and provides insights into the design of tandem electrocatalysts for NH3 evolution.
Tandem nitrate electroreduction reaction (NO3‐RR) is a promising method for green ammonia (NH3) synthesis. However, the mismatched kinetics processes between NO3‐‐to‐NO2‐ and NO2‐‐to‐NH3 results in poor selectivity for NH3 and excess NO2‐ evolution in electrolyte solution. Herein, a Ni2+ substitution strategy for developing oxide heterostructure in Co/Fe layered double oxides (LDOs) was designed and employed as tandem electrocataltysts for NO3‐RR. (Co0.83Ni0.16)2Fe exhibited a high NH3 yield rate of 50.4 mg·cm‐2·h‐1 with a Faradaic efficiency of 97.8% at ‐0.42 V vs. reversible hydrogen electrode (RHE) in a pulsed electrolysis test. By combining with in situ/operando characterization technologies and theoretical calculations, we observed the strong selectivity of NH3 evolution over (Co0.83Ni0.16)2Fe, with Ni playing a dual role in NO3‐RR by i) modifying the electronic behavior of Co, and ii) serving as complementary site for active hydrogen (*H) supply. Therefore, the adsorption capacity of *NO2 and its subsequent hydrogenation on the Co sites became more thermodynamically feasible. This study shows that Ni substitution promotes the kinetics of the NO3‐RR and provides insights into the design of tandem electrocatalysts for NH3 evolution.
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