The development of highly efficient and durable bifunctional catalysts with minimal precious metal usage is critical for advancing proton exchange membrane water electrolysis(PEMWE).We present an iridium-platinum nano...The development of highly efficient and durable bifunctional catalysts with minimal precious metal usage is critical for advancing proton exchange membrane water electrolysis(PEMWE).We present an iridium-platinum nanoalloy(IrPt)supported on lanthanum and nickel co-doped cobalt oxide,featuring a core-shell architecture with an amorphous IrPtOx shell and an IrPt core.This catalyst exhibits exceptional bifunctional activity for oxygen and hydrogen evolution reactions in acidic media,achieving 2 A cm^(-2)at 1.72 V in a PEMWE device with ultralow loadings of 0.075 mgIr cm^(-2)and 0.075 mgPt cm^(-2)at anode and cathode,respectively.It demonstrates outstanding durability,sustaining water splitting for over 646 h with a degradation rate of only 5μV h^(-1),outperforming state-of-the-art Ir-based catalysts.In situ X-ray absorption spectroscopy and density functional theory simulations reveal that the optimized charge redistribution between Ir and Pt,along with the IrPt core-IrPtOx shell structure,enhances performance.The Ir-O-Pt active sites enable a bi-nuclear mechanism for oxygen evolution reaction and a Volmer-Tafel mechanism for hydrogen evolution reaction,reducing kinetic barriers.Hierarchical porosity,abundant oxygen vacancies,and a high electrochemical surface area further improve electron and mass transfer.This work offers a cost-effective solution for green hydrogen production and advances the design of highperformance bifunctional catalysts for PEMWE.展开更多
Microwave absorption(MA)materials are essential for protecting against harmful electromagnetic radiation.In this study,highly efficient and ultrawide-band microwave-absorbing fabrics with superhydrophobic surface feat...Microwave absorption(MA)materials are essential for protecting against harmful electromagnetic radiation.In this study,highly efficient and ultrawide-band microwave-absorbing fabrics with superhydrophobic surface features were developed using a facile dip-coating method involving in situ graphene oxide(GO)reduction,deposition of TiO_(2) nanoparticles,and subsequent coating of a mixture of polydimethylsiloxane(PDMS)and octadecylamine(ODA)on polyester fabrics.Owing to the presence of hierarchically structured surfaces and low-surface-energy materials,the resultant reduced GO(rGO)/TiO_(2)-ODA/PDMS-coated fabrics demonstrate superhydrophobicity with a water contact angle of 159°and sliding angle of 5°.Under the synergistic effects of conduction loss,interface polarization loss,and surface roughness topography,the optimized fabrics show excellent microwave absorbing performances with a minimum reflection loss(RL_(min))of47.4 dB and a maximum effective absorption bandwidth(EAB_(max))of 7.7 GHz at a small rGO loading of 6.9 wt%.In addition,the rGO/TiO_(2)-ODA/PDMS coating was robust,and the coated fabrics could withstand repeated washing,soiling,long-term ultraviolet irradiation,and chemical attacks without losing their superhydrophobicity and MA properties.Moreover,the coating imparts self-healing properties to the fabrics.This study provides a promising and effective route for the development of robust and flexible materials with microwave-absorbing properties.展开更多
Cellulose-based fabrics are ubiquitous in our daily lives.They are the preferred choice for bedding materials,active sportswear,and next-to-skin apparels.However,the hydrophilic and polysaccharide characteristics of c...Cellulose-based fabrics are ubiquitous in our daily lives.They are the preferred choice for bedding materials,active sportswear,and next-to-skin apparels.However,the hydrophilic and polysaccharide characteristics of cellulose materials make them vulnerable to bacterial attack and pathogen infection.The design of antibacterial cellulose fabrics has been a long-term and on-going effort.Fabrication strategies based on the construction of surface micro-/nanostructure,chemical modification,and the application of antibacterial agents have been extensively investigated by many research groups worldwide.This review systematically discusses recent research on super-hydrophobic and antibacterial cellulose fabrics,focusing on morphology construction and surface modification.First,natural surfaces showing liquid-repellent and antibacterial properties are introduced and the mechanisms behind are explained.Then,the strategies for fabricating super-hydrophobic cellulose fabrics are summarized,and the contribution of the liquid-repellent function to reducing the adhesion of live bacteria and removing dead bacteria is elucidated.Representative studies on cellulose fabrics functionalized with super-hydrophobic and antibacterial properties are discussed in detail,and their potential applications are also introduced.Finally,the challenges in achieving super-hydrophobic antibacterial cellulose fabrics are discussed,and the future research direction in this area is proposed.展开更多
Advanced fabric electronics for long-term personal physiological monitoring,with a self-sufficient energy source,high integrity,sensitivity,wearing comfort,and homogeneous components are urgently desired.Instead of as...Advanced fabric electronics for long-term personal physiological monitoring,with a self-sufficient energy source,high integrity,sensitivity,wearing comfort,and homogeneous components are urgently desired.Instead of assembling a self-powered biosensor,comprising a variety of materials with different levels of hardness,and supplementing with a booster or energy storage device,herein,an all-fiber integrated thermoelectrically powered physiological monitoring device(FPMD),is proposed and evaluated for production at an industrial scale.For the first time,an organic electrochemical transistor(OECT)biosensor is enabled by thermoelectric fabrics(TEFs)adaptively,sustainably and steadily without any additional accessories.Moreover,both the OECT and TEFs are constructed using a cotton/poly(3,4-ethylenedioxythiophene):poly(styrenesulfon ate)/dimethylsulfoxide/(3-glycidyloxypropyl)trimethoxysilane(PDG)yarn,which is lightweight,robust(90°bending for 1000 cycles)and sweat-resistant(ΔR/R0=1.9%).A small temperature gradient(ΔT=2.2 K)between the environment and the human body can drive the high-gain OECT(71.08 mS)with high fidelity,and a good signal to noise ratio.For practical applications,the on-body FPMD produced an enduring and steady output signal and demonstrated a linear monitoring region(sensitivity of 30.4 NCR(normalized current response)/dec,10 nM~50µM)for glucose in artificial sweat with reliable performance regarding anti-interference and reproducibility.This device can be expanded to the monitoring of various bio-markers and provides a new strategy for constructing wearable,comfortable,highly integrated and self-powered biosensors.展开更多
基金supported by overseas Outstanding Youth Science Fund Project provided by National Natural Science Foundation of China(NSFC)under contract No.22Z990204807Natural Sciences—Basic Research Special Zone Program provided by shanghai government under contract No.22Z511203738+3 种基金Key Open Fund Project provided by Shaoxing New Energy and Molecular Engineering Research Institute,Shanghai Jiao Tong University under contract No.22H010103236Sinopec Natural Science research project provided by Sinopec research institute of petroleum processing under contract No.23H010100026support from National Science Foundation of China(22309113)Scientific and Technological Project of Yunnan Precious Metals Laboratory(YPML20240502029).
文摘The development of highly efficient and durable bifunctional catalysts with minimal precious metal usage is critical for advancing proton exchange membrane water electrolysis(PEMWE).We present an iridium-platinum nanoalloy(IrPt)supported on lanthanum and nickel co-doped cobalt oxide,featuring a core-shell architecture with an amorphous IrPtOx shell and an IrPt core.This catalyst exhibits exceptional bifunctional activity for oxygen and hydrogen evolution reactions in acidic media,achieving 2 A cm^(-2)at 1.72 V in a PEMWE device with ultralow loadings of 0.075 mgIr cm^(-2)and 0.075 mgPt cm^(-2)at anode and cathode,respectively.It demonstrates outstanding durability,sustaining water splitting for over 646 h with a degradation rate of only 5μV h^(-1),outperforming state-of-the-art Ir-based catalysts.In situ X-ray absorption spectroscopy and density functional theory simulations reveal that the optimized charge redistribution between Ir and Pt,along with the IrPt core-IrPtOx shell structure,enhances performance.The Ir-O-Pt active sites enable a bi-nuclear mechanism for oxygen evolution reaction and a Volmer-Tafel mechanism for hydrogen evolution reaction,reducing kinetic barriers.Hierarchical porosity,abundant oxygen vacancies,and a high electrochemical surface area further improve electron and mass transfer.This work offers a cost-effective solution for green hydrogen production and advances the design of highperformance bifunctional catalysts for PEMWE.
基金supported by the National Natural Science Foundation of China(22372087)the Natural Science Foundation of Shandong Province(ZR2021ME039)+4 种基金the Applied Basic Research Programs of National Textile Industry Federation(J202106)the Newtech Textile Technology Development(Shanghai)Co.,Ltd.,Chinathe Jiangsu New Vison Advanced Functional Fiber Innovation Centersupport from both the Research Centre of Textiles for Future Fashion at The Hong Kong Polytechnic UniversityThe Hong Kong Jockey Club Charities Trust.
文摘Microwave absorption(MA)materials are essential for protecting against harmful electromagnetic radiation.In this study,highly efficient and ultrawide-band microwave-absorbing fabrics with superhydrophobic surface features were developed using a facile dip-coating method involving in situ graphene oxide(GO)reduction,deposition of TiO_(2) nanoparticles,and subsequent coating of a mixture of polydimethylsiloxane(PDMS)and octadecylamine(ODA)on polyester fabrics.Owing to the presence of hierarchically structured surfaces and low-surface-energy materials,the resultant reduced GO(rGO)/TiO_(2)-ODA/PDMS-coated fabrics demonstrate superhydrophobicity with a water contact angle of 159°and sliding angle of 5°.Under the synergistic effects of conduction loss,interface polarization loss,and surface roughness topography,the optimized fabrics show excellent microwave absorbing performances with a minimum reflection loss(RL_(min))of47.4 dB and a maximum effective absorption bandwidth(EAB_(max))of 7.7 GHz at a small rGO loading of 6.9 wt%.In addition,the rGO/TiO_(2)-ODA/PDMS coating was robust,and the coated fabrics could withstand repeated washing,soiling,long-term ultraviolet irradiation,and chemical attacks without losing their superhydrophobicity and MA properties.Moreover,the coating imparts self-healing properties to the fabrics.This study provides a promising and effective route for the development of robust and flexible materials with microwave-absorbing properties.
基金supported by:Natural Science Fund of Shandong Province(No.ZR2020ME062 and ZR2021ME039)Jiangsu New Vison Advanced Functional Fiber Innovation Center+2 种基金Applied Basic Research Programs of National Textile Industry Federation(No.J202106)National Innovation Center of Advanced Dyeing and Finishing Technology(No.2022GCJJ25)XW would like to acknowledge the support from the Hong Kong Jockey Club Charities Trust and the Research Institute for Sports Science and Technology at the Hong Kong Polytechnic University(P0043811).
文摘Cellulose-based fabrics are ubiquitous in our daily lives.They are the preferred choice for bedding materials,active sportswear,and next-to-skin apparels.However,the hydrophilic and polysaccharide characteristics of cellulose materials make them vulnerable to bacterial attack and pathogen infection.The design of antibacterial cellulose fabrics has been a long-term and on-going effort.Fabrication strategies based on the construction of surface micro-/nanostructure,chemical modification,and the application of antibacterial agents have been extensively investigated by many research groups worldwide.This review systematically discusses recent research on super-hydrophobic and antibacterial cellulose fabrics,focusing on morphology construction and surface modification.First,natural surfaces showing liquid-repellent and antibacterial properties are introduced and the mechanisms behind are explained.Then,the strategies for fabricating super-hydrophobic cellulose fabrics are summarized,and the contribution of the liquid-repellent function to reducing the adhesion of live bacteria and removing dead bacteria is elucidated.Representative studies on cellulose fabrics functionalized with super-hydrophobic and antibacterial properties are discussed in detail,and their potential applications are also introduced.Finally,the challenges in achieving super-hydrophobic antibacterial cellulose fabrics are discussed,and the future research direction in this area is proposed.
基金supported by the Natural Science Foundation of China(U20A20257)the National Key Research and Development Program(2022YFB3805803)+2 种基金Science and Technology Innovation Project of Hubei Province of China(2021BAA067)Outstanding Youth Project of Natural Science Foundation of Hubei Province of China(2021CFA068)Outstanding Young and Middleaged Innovation Team of Hubei Province of China(T2021007).
文摘Advanced fabric electronics for long-term personal physiological monitoring,with a self-sufficient energy source,high integrity,sensitivity,wearing comfort,and homogeneous components are urgently desired.Instead of assembling a self-powered biosensor,comprising a variety of materials with different levels of hardness,and supplementing with a booster or energy storage device,herein,an all-fiber integrated thermoelectrically powered physiological monitoring device(FPMD),is proposed and evaluated for production at an industrial scale.For the first time,an organic electrochemical transistor(OECT)biosensor is enabled by thermoelectric fabrics(TEFs)adaptively,sustainably and steadily without any additional accessories.Moreover,both the OECT and TEFs are constructed using a cotton/poly(3,4-ethylenedioxythiophene):poly(styrenesulfon ate)/dimethylsulfoxide/(3-glycidyloxypropyl)trimethoxysilane(PDG)yarn,which is lightweight,robust(90°bending for 1000 cycles)and sweat-resistant(ΔR/R0=1.9%).A small temperature gradient(ΔT=2.2 K)between the environment and the human body can drive the high-gain OECT(71.08 mS)with high fidelity,and a good signal to noise ratio.For practical applications,the on-body FPMD produced an enduring and steady output signal and demonstrated a linear monitoring region(sensitivity of 30.4 NCR(normalized current response)/dec,10 nM~50µM)for glucose in artificial sweat with reliable performance regarding anti-interference and reproducibility.This device can be expanded to the monitoring of various bio-markers and provides a new strategy for constructing wearable,comfortable,highly integrated and self-powered biosensors.
