Although electrocatalytic water splitting holds significant promise for hydrogen production,unfavorable reaction energy barriers and kinetic properties lead to unsatisfactory conversion efficiency.Herein,we provide an...Although electrocatalytic water splitting holds significant promise for hydrogen production,unfavorable reaction energy barriers and kinetic properties lead to unsatisfactory conversion efficiency.Herein,we provide an innovative strategy to optimize the electrochemical activity of the Fe/Ni_(2)P catalyst through near-infrared(NIR)-induced photothermal effect.The Fe/Ni_(2)P-NIR yields a current density of 10 mA cm^(-2)at ultralow overpotentials of 16 mV for the hydrogen evolution reaction(HER)and 167 mV for the oxygen evolution reaction(OER),with Tafel slopes of 38.7 and 46.2 mV dec^(-1),respectively.This bifunctional catalyst also delivers 10 mA cm^(-2)at a low voltage of 1.40 V for overall water splitting.The NIR photoinduced local thermal effect activates abundant catalytic sites,accelerates charge and mass transfer,and improves intrinsic reaction kinetics.Guided by density functional theory(DFT)calculations,the photothermal effect reduces the energy barriers of the rate-determining steps(RDS)for^(*)H desorption on Fe/Ni_(2)P during HER and^(*)O formation on its reconstructed active phase NiFeOOH during OER.We realized photothermal-electrochemical integration with Fe/Ni_(2)P-NIR in an anion exchange membrane(AEM)electrolyzer,attaining 500 mA cm^(-2)at 1.76 V,with excellent stability over 50 h.This strategy may significantly advance energy conversion technology towards economic hydrogen production through water electrolysis.展开更多
Nowadays,virtual human(VH) is becoming a hot research topic in virtualization.VH dialogue can be categorized as an application of natural language processing(NLP) technology,since it is relational to question and answ...Nowadays,virtual human(VH) is becoming a hot research topic in virtualization.VH dialogue can be categorized as an application of natural language processing(NLP) technology,since it is relational to question and answering(QA) technologies.In order to integrate these technologies,this paper reviews some important work on VH dialogue,and predicts some research points on the view of QA technologies.展开更多
Solar energy is one of the most popular clean energy sources and is a promising alternative to fulfill the increasing energy demands of modem society. Solar cells have long been under intensive research attention for ...Solar energy is one of the most popular clean energy sources and is a promising alternative to fulfill the increasing energy demands of modem society. Solar cells have long been under intensive research attention for harvesting energy from sunlight with a high power-conversion efficiency and low cost. However, the power outputs of photovoltaic devices suffer from fluctuations due to the intermittent instinct of the solar radiation. Integrating solar cells and energy- storage devices as self-powering systems may solve this problem through the simultaneous storage of the electricity and manipulation of the energy output. This review the research progress in the integration of new-generation solar cells with supercapacitors, with emphasis on the structures, materials, performance, and new design features. The current challenges and future prospects are discussed with the aim of expanding research and development in this field.展开更多
基金the support from the Basic Science Center Program for Ordered Energy Conversion of the National Natural Science Foundation of China(No.52488201)the National Key R&D Program of China(2021YFF0500504)the Fundamental Research Funds for the Central Universities。
文摘Although electrocatalytic water splitting holds significant promise for hydrogen production,unfavorable reaction energy barriers and kinetic properties lead to unsatisfactory conversion efficiency.Herein,we provide an innovative strategy to optimize the electrochemical activity of the Fe/Ni_(2)P catalyst through near-infrared(NIR)-induced photothermal effect.The Fe/Ni_(2)P-NIR yields a current density of 10 mA cm^(-2)at ultralow overpotentials of 16 mV for the hydrogen evolution reaction(HER)and 167 mV for the oxygen evolution reaction(OER),with Tafel slopes of 38.7 and 46.2 mV dec^(-1),respectively.This bifunctional catalyst also delivers 10 mA cm^(-2)at a low voltage of 1.40 V for overall water splitting.The NIR photoinduced local thermal effect activates abundant catalytic sites,accelerates charge and mass transfer,and improves intrinsic reaction kinetics.Guided by density functional theory(DFT)calculations,the photothermal effect reduces the energy barriers of the rate-determining steps(RDS)for^(*)H desorption on Fe/Ni_(2)P during HER and^(*)O formation on its reconstructed active phase NiFeOOH during OER.We realized photothermal-electrochemical integration with Fe/Ni_(2)P-NIR in an anion exchange membrane(AEM)electrolyzer,attaining 500 mA cm^(-2)at 1.76 V,with excellent stability over 50 h.This strategy may significantly advance energy conversion technology towards economic hydrogen production through water electrolysis.
基金National Nature Science Foundations of China(Nos.61170027,61202169,and 61301140)Tianjin"131"Creative Talents Training Project,China(the 3rd level)
文摘Nowadays,virtual human(VH) is becoming a hot research topic in virtualization.VH dialogue can be categorized as an application of natural language processing(NLP) technology,since it is relational to question and answering(QA) technologies.In order to integrate these technologies,this paper reviews some important work on VH dialogue,and predicts some research points on the view of QA technologies.
文摘Solar energy is one of the most popular clean energy sources and is a promising alternative to fulfill the increasing energy demands of modem society. Solar cells have long been under intensive research attention for harvesting energy from sunlight with a high power-conversion efficiency and low cost. However, the power outputs of photovoltaic devices suffer from fluctuations due to the intermittent instinct of the solar radiation. Integrating solar cells and energy- storage devices as self-powering systems may solve this problem through the simultaneous storage of the electricity and manipulation of the energy output. This review the research progress in the integration of new-generation solar cells with supercapacitors, with emphasis on the structures, materials, performance, and new design features. The current challenges and future prospects are discussed with the aim of expanding research and development in this field.
基金supported by the National Natural Science Foundation China(52073121)the Science and Technology Program of Guangzhou(202102010117)+1 种基金the Fundamental Research Funds for the Central Universities(21622406)the Project Team of Foshan National Hi-tech Industrial Development Zone Industrialization Entrepreneurial Teams Program(2220197000129).
