Hyperpolarization of nuclear spins is crucial for advancing nuclear magnetic resonance and quantum information technologies,as nuclear spins typically exhibit extremely low polarization at room temperature due to thei...Hyperpolarization of nuclear spins is crucial for advancing nuclear magnetic resonance and quantum information technologies,as nuclear spins typically exhibit extremely low polarization at room temperature due to their small gyromagnetic ratios.A promising approach to achieving high nuclear spin polarization is transferring the polarization of electrons to nuclear spins.The nitrogen-vacancy(NV)center in diamond has emerged as a highly effective medium for this purpose,and various hyperpolarization protocols have been developed.Among these,the pulsed polarization(PulsePol)method has been extensively studied due to its robustness against static energy shifts of the electron spin.In this work,we present a novel polarization protocol and uncover a family of magic sequences for hyperpolarizing nuclear spins,with PulsePol emerging as a special case of our general approach.Notably,we demonstrate that some of these magic sequences exhibit significantly greater robustness compared to the PulsePol protocol in the presence of finite half𝜋pulse duration of the protocol,Rabi and detuning errors.This enhanced robustness positions our protocol as a more suitable candidate for hyper-polarizing nuclear spins species with large gyromagnetic ratios and also ensures better compatibility with high-efficiency readout techniques at high magnetic fields.Additionally,the generality of our protocol allows for its direct application to other solid-state quantum systems beyond the NV center.展开更多
Electrocatalytic water splitting stands at the forefront for advancing renewable energy technologies.A critical challenge in this realm is the detrimental effect of gas bubble adhesion on electrode surfaces,which impa...Electrocatalytic water splitting stands at the forefront for advancing renewable energy technologies.A critical challenge in this realm is the detrimental effect of gas bubble adhesion on electrode surfaces,which impairs electrochemical efficiency.Addressing this,our study introduces a superaerophobic nickelbased catalyst,innovatively fabricated through electrodeposition on pencil-drawn,non-conductive A4 paper.The catalyst’s distinctive feature arises from phosphorus(P)doping,which instigates lattice contraction in the nickel metal,culminating in a cracked surface topology.This morphological alteration is demonstrated to engender superaerophobic properties,a conclusion substantiated by comprehensive first-principles calculations and meticulous surface tension measurements.The electrocatalyst showcases enhanced performance in water splitting,primarily attributed to the minimal gas bubble adhesion on its superaerophobic surface.This performance notably surpasses that of commercial Pt plates,especially at elevated current densities.Additionally,P-doping plays a pivotal role in bolstering the electrode’s corrosion resistance against the electrolyte,thereby augmenting its structural stability and longevity.Our findings pave the way for a novel and efficacious approach for developing high-performance electrocatalysts,offering significant promise for sustainable and efficient hydrogen production in renewable energy applications.展开更多
基金supported by the National Natural Science Foundation of China (Grant Nos.12475012,62461160263 for P.W.,and 62276171 for H.L.)Quantum Science and Technology-National Science and Technology Major Project of China (Project No.2023ZD0300600 for P.W.)+3 种基金Guangdong Provincial Quantum Science Strategic Initiative (Grant Nos.GDZX240-3009 and GDZX2303005 for P.W.)Guangdong Basic and Applied Basic Research Foundation (Grant No.2024-A1515011938 for H.L.)Shenzhen Fundamental ResearchGeneral Project (Grant No.JCYJ20240813141503005 for H.L.)the Talents Introduction Foundation of Beijing Normal University (Grant No.310432106 for P.W.)。
文摘Hyperpolarization of nuclear spins is crucial for advancing nuclear magnetic resonance and quantum information technologies,as nuclear spins typically exhibit extremely low polarization at room temperature due to their small gyromagnetic ratios.A promising approach to achieving high nuclear spin polarization is transferring the polarization of electrons to nuclear spins.The nitrogen-vacancy(NV)center in diamond has emerged as a highly effective medium for this purpose,and various hyperpolarization protocols have been developed.Among these,the pulsed polarization(PulsePol)method has been extensively studied due to its robustness against static energy shifts of the electron spin.In this work,we present a novel polarization protocol and uncover a family of magic sequences for hyperpolarizing nuclear spins,with PulsePol emerging as a special case of our general approach.Notably,we demonstrate that some of these magic sequences exhibit significantly greater robustness compared to the PulsePol protocol in the presence of finite half𝜋pulse duration of the protocol,Rabi and detuning errors.This enhanced robustness positions our protocol as a more suitable candidate for hyper-polarizing nuclear spins species with large gyromagnetic ratios and also ensures better compatibility with high-efficiency readout techniques at high magnetic fields.Additionally,the generality of our protocol allows for its direct application to other solid-state quantum systems beyond the NV center.
基金funding support from the National Natural Science Foundation of China(52375204)the World First Class University and First Class Academic Discipline Construction Funding 2023(0206023GH0202 and 0206023SH0201)+3 种基金Shaanxi Provincial Science and Technology Innovation Team under grant code 2024RS-CXTD-63the funding support from the Hong Kong Polytechnic University(project number:1-BE47,ZE0C,ZE2F and ZE2X)the funding support from the National Natural Science Foundation of China(51401084)the Natural Science Foundation of Jiangxi,China(20232ACB203002).
文摘Electrocatalytic water splitting stands at the forefront for advancing renewable energy technologies.A critical challenge in this realm is the detrimental effect of gas bubble adhesion on electrode surfaces,which impairs electrochemical efficiency.Addressing this,our study introduces a superaerophobic nickelbased catalyst,innovatively fabricated through electrodeposition on pencil-drawn,non-conductive A4 paper.The catalyst’s distinctive feature arises from phosphorus(P)doping,which instigates lattice contraction in the nickel metal,culminating in a cracked surface topology.This morphological alteration is demonstrated to engender superaerophobic properties,a conclusion substantiated by comprehensive first-principles calculations and meticulous surface tension measurements.The electrocatalyst showcases enhanced performance in water splitting,primarily attributed to the minimal gas bubble adhesion on its superaerophobic surface.This performance notably surpasses that of commercial Pt plates,especially at elevated current densities.Additionally,P-doping plays a pivotal role in bolstering the electrode’s corrosion resistance against the electrolyte,thereby augmenting its structural stability and longevity.Our findings pave the way for a novel and efficacious approach for developing high-performance electrocatalysts,offering significant promise for sustainable and efficient hydrogen production in renewable energy applications.
