Addressing the CO-sensitive and catalytic efficiency issues of noble metal-based electrocatalysts towards alkaline hydrogen oxidation reaction(HOR)is indispensable for the practical commercialization of advanced anion...Addressing the CO-sensitive and catalytic efficiency issues of noble metal-based electrocatalysts towards alkaline hydrogen oxidation reaction(HOR)is indispensable for the practical commercialization of advanced anion exchange membrane fuel cells(AEMFCs).Here,Ni-N-C supported Ir catalysts denoted as Ir/Ni-N-C have been constructed and demonstrated greatly improved resistance towards CO impurities compared to conventional N-C or pure C anchored Ir nanoparticles after long-term CO poisoning.Besides,Ir/Ni-N-C possesses superior specific and mass activity of 0.557 mA cm^(-2)and 1.15 mAμgPGM^(-1),which is approximately 2-times higher than that of Ir/C and even outperforms the state-of-the-art commercial Pt/C catalysts.Combining in-situ surface-enhanced infrared absorption spectroscopy and density functional calculation,the band structure modulation and coordination effect of Ni-N-C supports lead to strengthened hydroxyl binding energy,promoted CO oxidative desorption under working potential,and lowered activation barrier of the rate-determining process of alkaline HOR.This work sheds light on the importance of metal-N-C substrates for solving the CO-tolerance and intrinsic activity challenges,and provides new insights for noble-metal based catalysts designing.展开更多
Severe skin wounds cause great problems and sufferings to patients.In this study,an injectable wound dressing based on strontium ion cross-linked starch hydrogel(SSH)was developed and evaluated.The good inject-ability...Severe skin wounds cause great problems and sufferings to patients.In this study,an injectable wound dressing based on strontium ion cross-linked starch hydrogel(SSH)was developed and evaluated.The good inject-ability of SSH made it easy to be delivered onto the wound surface.The good tissue adhesiveness of SSH ensured a firm protection of the wound.Besides,SSH supported the proliferation of NIH/3T3 fibroblasts and facilitated the migration of human umbilical vein endothelial cells(HUVECs).Importantly,SSH exhibited strong antibacterial effects on Staphylococcus aiireiis(S.ai/rec/s),which could prevent wound infection.These results demonstrate that SSH is a promising wound dressing material for promoting wound healing.展开更多
To the Editor: Chronic airflow obstruction (CAO) is a characteristic feature of chronic obstructive pulmonary disease (COPD) and occurs due to airway and/or alveolar abnormalities typically associated with exposure to...To the Editor: Chronic airflow obstruction (CAO) is a characteristic feature of chronic obstructive pulmonary disease (COPD) and occurs due to airway and/or alveolar abnormalities typically associated with exposure to noxious particles or gases.[1] The major risk factor for CAO is cigarette smoking, but exposure to solid fuel likely influences CAO development. Studies have found that solid fuel exposure is associated with a high prevalence of CAO, particularly among women.[2] Comparing COPD caused by either solid fuel or tobacco smoke exposure is very significant because about 3 billion people are exposed to solid fuel smoke, and 1.01 billion people smoke tobacco, globally. This study aimed to investigate and compare the clinical and functional characteristics of CAO patients exposed to solid fuel and tobacco smoke using propensity score matching (PSM) in western China.展开更多
基金supported by the National Key Research and Development Program of China(2021YFB4001200)National Natural Science Foundation of China(22272121,21972107).
文摘Addressing the CO-sensitive and catalytic efficiency issues of noble metal-based electrocatalysts towards alkaline hydrogen oxidation reaction(HOR)is indispensable for the practical commercialization of advanced anion exchange membrane fuel cells(AEMFCs).Here,Ni-N-C supported Ir catalysts denoted as Ir/Ni-N-C have been constructed and demonstrated greatly improved resistance towards CO impurities compared to conventional N-C or pure C anchored Ir nanoparticles after long-term CO poisoning.Besides,Ir/Ni-N-C possesses superior specific and mass activity of 0.557 mA cm^(-2)and 1.15 mAμgPGM^(-1),which is approximately 2-times higher than that of Ir/C and even outperforms the state-of-the-art commercial Pt/C catalysts.Combining in-situ surface-enhanced infrared absorption spectroscopy and density functional calculation,the band structure modulation and coordination effect of Ni-N-C supports lead to strengthened hydroxyl binding energy,promoted CO oxidative desorption under working potential,and lowered activation barrier of the rate-determining process of alkaline HOR.This work sheds light on the importance of metal-N-C substrates for solving the CO-tolerance and intrinsic activity challenges,and provides new insights for noble-metal based catalysts designing.
基金sponsored by the National Natural Science Foundation of China(Grant Nos.51672184,81930070,81622032 and 81501858)the Natural Science Research of Jiangsu Higher Education Institutions(No.17KJA180011)the Jiangsu Innovation and Entrepreneur-ship Program,and the Priority Academice Program Development of Jiangsu High Education Institutions(PAPD).
文摘Severe skin wounds cause great problems and sufferings to patients.In this study,an injectable wound dressing based on strontium ion cross-linked starch hydrogel(SSH)was developed and evaluated.The good inject-ability of SSH made it easy to be delivered onto the wound surface.The good tissue adhesiveness of SSH ensured a firm protection of the wound.Besides,SSH supported the proliferation of NIH/3T3 fibroblasts and facilitated the migration of human umbilical vein endothelial cells(HUVECs).Importantly,SSH exhibited strong antibacterial effects on Staphylococcus aiireiis(S.ai/rec/s),which could prevent wound infection.These results demonstrate that SSH is a promising wound dressing material for promoting wound healing.
基金Beijing Hospital Clinical Research 121 Project(No.BJ-2018-199)National Science and Technology Major Project(No.2018YFC1315101)。
文摘To the Editor: Chronic airflow obstruction (CAO) is a characteristic feature of chronic obstructive pulmonary disease (COPD) and occurs due to airway and/or alveolar abnormalities typically associated with exposure to noxious particles or gases.[1] The major risk factor for CAO is cigarette smoking, but exposure to solid fuel likely influences CAO development. Studies have found that solid fuel exposure is associated with a high prevalence of CAO, particularly among women.[2] Comparing COPD caused by either solid fuel or tobacco smoke exposure is very significant because about 3 billion people are exposed to solid fuel smoke, and 1.01 billion people smoke tobacco, globally. This study aimed to investigate and compare the clinical and functional characteristics of CAO patients exposed to solid fuel and tobacco smoke using propensity score matching (PSM) in western China.
