Efficient,stable and economical water electrolysis catalysts are of paramount importance in energy transition and storage systems.Although numerous single compounds exhibit electrocatalytic properties,there are inhere...Efficient,stable and economical water electrolysis catalysts are of paramount importance in energy transition and storage systems.Although numerous single compounds exhibit electrocatalytic properties,there are inherent limitations to achieving optimal performance.In this study,a highly active electrode was synthesized by constructing a heterojunction between Fe_(2)(MoO_(4))_(3) and Ni(OH)_(2).The Ni(OH)_(2)/Fe_(2)(MoO_(4))_(3)@TM heterojunction catalytic electrode demonstrated remarkable activity for water oxidation in a 1.0 M KOH electrolyte.It exhibited a low overpotential of 265 mV at a current output of 10 mA cm^(-2),concomitantly maintaining excellent stability.Comprehensive characterizations,including electrochemical measurements,in situ ATR-FTIR,DEMS,TEM,in situ Raman and DFT calculations,collectively confirm the superior catalytic performance of the electrode.The results indicate that the synergistic effects of the fabricated heterojunction electrode optimize the d-band center,modulate the adsorption energies of ^(*)OH and ^(*)O at the electrode-electrolyte interface,promote electron transfer and surface reconstruction of the catalyst,and thus enhance OER activity and stability.The synergistic effect resulting from interface and reconstruction engineering can provide a new concept for the development of advanced electrocatalysts for sustainable energy applications.展开更多
Exploring the interplay between topology and nonlinearity leads to an emerging field of nonlinear topological physics,which extends the study of fascinating properties of topological states to a regime where interacti...Exploring the interplay between topology and nonlinearity leads to an emerging field of nonlinear topological physics,which extends the study of fascinating properties of topological states to a regime where interactions between the particles cannot be neglected.For ultracold atomic systems,although many exotic topological states have been recently observed,the nonlinear effect remains elusive.Here,based on the laser-driven couplings of discrete atomic momentum states,we synthesize a topological trimer array,where the atomic interactions give rise to tunable nonlinearities.We observe the formation of nonlinear edge states in the density population evolution and participation ratio with increasing interaction,in contrast to the diffusive transport in a broad interaction range in nontopological arrays.Furthermore,we show the impact of interactions on the population distribution evolved from the initialized single-site population.Our work opens the avenue for exploring emergent nonlinear topological behaviors in ultracold atomic gases.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.22469018 and 22178219)Natural Science Foundation of Ningxia Hui Autonomous Region(2024AAC05028)+6 种基金Natural Science Project of Universities and Colleges in Ningxia(NYG2024021)Graduate Innovation Project of Ningxia University(CXXM202413)the Central Guidance for Local Science and Technology Development Funds of China(No.2024FRD05084)Inner Mongolia R&D Program Plan(2021ZD0042,2021EEDSCXSFQZD006,2021GG0350)Ordos R&D Program(2121HZ231-8)the Scientific Research Start-Up Project Program of Ningxia UniversityJunjun Zhang thanks the Chinese Academy of Sciences Western Young Scholar Program for the scholarships and the Young Elite Scientist Sponsorship Program of the Ningxia Association for Science and Technology(2023).
文摘Efficient,stable and economical water electrolysis catalysts are of paramount importance in energy transition and storage systems.Although numerous single compounds exhibit electrocatalytic properties,there are inherent limitations to achieving optimal performance.In this study,a highly active electrode was synthesized by constructing a heterojunction between Fe_(2)(MoO_(4))_(3) and Ni(OH)_(2).The Ni(OH)_(2)/Fe_(2)(MoO_(4))_(3)@TM heterojunction catalytic electrode demonstrated remarkable activity for water oxidation in a 1.0 M KOH electrolyte.It exhibited a low overpotential of 265 mV at a current output of 10 mA cm^(-2),concomitantly maintaining excellent stability.Comprehensive characterizations,including electrochemical measurements,in situ ATR-FTIR,DEMS,TEM,in situ Raman and DFT calculations,collectively confirm the superior catalytic performance of the electrode.The results indicate that the synergistic effects of the fabricated heterojunction electrode optimize the d-band center,modulate the adsorption energies of ^(*)OH and ^(*)O at the electrode-electrolyte interface,promote electron transfer and surface reconstruction of the catalyst,and thus enhance OER activity and stability.The synergistic effect resulting from interface and reconstruction engineering can provide a new concept for the development of advanced electrocatalysts for sustainable energy applications.
基金supported by the Innovation Program for Quantum Science and Technology(Grant Nos.2021ZD0302103)the National Key Research and Development Program of China(Grant Nos.2022YFA1404201)+1 种基金the National Natural Science Foundation of China(Grant Nos.62325505,62422508,12474337,62175140 and 12104353)the Applied Basic Research Project of Shanxi Province(Grant No.202203021224001).
文摘Exploring the interplay between topology and nonlinearity leads to an emerging field of nonlinear topological physics,which extends the study of fascinating properties of topological states to a regime where interactions between the particles cannot be neglected.For ultracold atomic systems,although many exotic topological states have been recently observed,the nonlinear effect remains elusive.Here,based on the laser-driven couplings of discrete atomic momentum states,we synthesize a topological trimer array,where the atomic interactions give rise to tunable nonlinearities.We observe the formation of nonlinear edge states in the density population evolution and participation ratio with increasing interaction,in contrast to the diffusive transport in a broad interaction range in nontopological arrays.Furthermore,we show the impact of interactions on the population distribution evolved from the initialized single-site population.Our work opens the avenue for exploring emergent nonlinear topological behaviors in ultracold atomic gases.
