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Hierarchical MoS@NiFeCo-Mo(doped)-Layered Double Hydroxide Heterostructures as Efficient Alkaline Water Splitting (Photo)Electro-catalysts.
Small
January 2025
Department of Chemistry, Nanoscience Center, University of Jyväskylä, P.O. Box 35, Jyväskylä, FI-40014, Finland.
Designing cost-effective electrocatalysts with fast reaction kinetics and high stability is an outstanding challenge in green hydrogen generation through overall water splitting (OWS). Layered double hydroxide (LDH) heterostructure materials are promising candidates to catalyze both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), the two OWS half-cell reactions. This work develops a facile hydrothermal route to synthesiz hierarchical heterostructure MoS@NiFeCo-LDH and MoS@NiFeCo-Mo(doped)-LDH electrocatalysts, which exhibit extremely good OER and HER performance as witnessed by their low IR-corrected overpotentials of 156 and 61 mV with at a current density of 10 mA cm under light assistance.
View Article and Find Full Text PDFMetacognitive confidence and affect - two sides of the same coin?
Cogn Emot
January 2025
Brain and Cognition, KU Leuven, Leuven, Belgium.
Decision confidence is a prototypical metacognitive representation that is thought to approximate the probability that a decision is correct. The perception of being correct has also been associated with affective valence such that being correct feels more positive and being mistaken more negative. This suggests that, similarly to confidence, affective valence reflects the probability that a decision is correct.
View Article and Find Full Text PDFModulating the structure of O3-type NaNiFeMnO for high-performance sodium-ion batteries via NaMoO reactive wetting coating combined with Mo doping and interface reconstruction.
J Colloid Interface Sci
January 2025
School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, Guangxi, PR China; Chongzuo Key Laboratory of Comprehensive Utilization Technology of Manganese Resources, Guangxi Key Laboratory for High-value Utilization of Manganese Resources, College of Chemistry and Biological Engineering, Guangxi Minzu Normal University, Chongzuo 532200, Guangxi, PR China. Electronic address:
O3-type NaNiFeMnO (NFM) is considered as a promising cathode material for sodium-ion batteries (SIBs) due to its high theoretical energy density and low production cost. However, the applications of NFM are restricted owing to detrimental interfacial side reactions and phase evolution during cycling. Herein, a three-in-one modification strategy, including NaMoO coating, surface reconstruction from layered to spinel phase, and Mo doping, is proposed to design NFM.
View Article and Find Full Text PDFTime-resolved spectroscopy uncovers deprotonation-induced reconstruction in oxygen-evolution NiFe-based (oxy)hydroxides.
Nat Commun
January 2025
National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, PR China.
Transition-metal layered double hydroxides are widely utilized as electrocatalysts for the oxygen evolution reaction (OER), undergoing dynamic transformation into active oxyhydroxides during electrochemical operation. Nonetheless, our understanding of the non-equilibrium structural changes that occur during this process remains limited. In this study, utilizing in situ energy-dispersive X-ray absorption spectroscopy and machine learning analysis, we reveal the occurrence of deprotonation and elucidate the role of incorporated iron in facilitating the transition from nickel-iron layered double hydroxide (NiFe LDH) into its active oxyhydroxide.
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