The hydrogen evolution reaction(HER)is a promising way to produce hydrogen,and the use of non-precious metals with an excellent electrochemical performance is vital for this.Carbon-based transition metal catalysts hav...The hydrogen evolution reaction(HER)is a promising way to produce hydrogen,and the use of non-precious metals with an excellent electrochemical performance is vital for this.Carbon-based transition metal catalysts have high activity and stability,which are important in reducing the cost of hydrogen production and promoting the development of the hydrogen production industry.However,there is a lack of discussion regarding the effect of carbon components on the performance of these electrocatalysts.This review of the literature discusses the choice of the carbon components in these catalysts and their impact on catalytic performance,including electronic structure control by heteroatom doping,morphology adjustment,and the influence of self-supporting materials.It not only analyzes the progress in HER,but also provides guidance for synthesizing high-performance carbon-based transition metal catalysts.展开更多
An all-fiber mode-locked fiber laser was achieved with a saturable absorber based on a tapered fiber deposited with layered molybdenum selenide(MoSe_2). The laser was operated at a central wavelength of 1558.35 nm wit...An all-fiber mode-locked fiber laser was achieved with a saturable absorber based on a tapered fiber deposited with layered molybdenum selenide(MoSe_2). The laser was operated at a central wavelength of 1558.35 nm with an output spectral width of 2.9 nm, and a pulse repetition rate of 16.33 MHz. To the best of our knowledge, this is the first report on mode-locked fiber lasers using MoSe_2 saturable absorbers based on tapered fibers.展开更多
从天津某海水养殖场底泥中分离出一株耐盐好氧反硝化菌,通过形态观察和16S r DNA序列分析,确定菌株为弧菌(Vibrio sp.),命名为FXH-01。考察了温度及碳源对菌株FXH-01脱氮效果的影响,结果表明,菌株的最适温度为30℃,最适碳源为丁二酸钠...从天津某海水养殖场底泥中分离出一株耐盐好氧反硝化菌,通过形态观察和16S r DNA序列分析,确定菌株为弧菌(Vibrio sp.),命名为FXH-01。考察了温度及碳源对菌株FXH-01脱氮效果的影响,结果表明,菌株的最适温度为30℃,最适碳源为丁二酸钠。最后基于海水养殖废水中含盐、贫营养等条件对菌株进行适应性驯化培养,使该菌株在24 h内对海水养殖废水中硝态氮的去除率达到18.18%,为微生物菌剂在海水养殖废水中的实际应用提供理论依据。展开更多
文摘The hydrogen evolution reaction(HER)is a promising way to produce hydrogen,and the use of non-precious metals with an excellent electrochemical performance is vital for this.Carbon-based transition metal catalysts have high activity and stability,which are important in reducing the cost of hydrogen production and promoting the development of the hydrogen production industry.However,there is a lack of discussion regarding the effect of carbon components on the performance of these electrocatalysts.This review of the literature discusses the choice of the carbon components in these catalysts and their impact on catalytic performance,including electronic structure control by heteroatom doping,morphology adjustment,and the influence of self-supporting materials.It not only analyzes the progress in HER,but also provides guidance for synthesizing high-performance carbon-based transition metal catalysts.
基金Project supported by the National Key Research and Development Program of China(Grant No.2018YFB0504500)the National Natural Science Foundation of China(Grant Nos.61475171,61705244,61307056,and 61875052)the Natural Science Foundation of Shanghai,China(Grant Nos.17ZR1433900 and17ZR1434200)
文摘An all-fiber mode-locked fiber laser was achieved with a saturable absorber based on a tapered fiber deposited with layered molybdenum selenide(MoSe_2). The laser was operated at a central wavelength of 1558.35 nm with an output spectral width of 2.9 nm, and a pulse repetition rate of 16.33 MHz. To the best of our knowledge, this is the first report on mode-locked fiber lasers using MoSe_2 saturable absorbers based on tapered fibers.
文摘从天津某海水养殖场底泥中分离出一株耐盐好氧反硝化菌,通过形态观察和16S r DNA序列分析,确定菌株为弧菌(Vibrio sp.),命名为FXH-01。考察了温度及碳源对菌株FXH-01脱氮效果的影响,结果表明,菌株的最适温度为30℃,最适碳源为丁二酸钠。最后基于海水养殖废水中含盐、贫营养等条件对菌株进行适应性驯化培养,使该菌株在24 h内对海水养殖废水中硝态氮的去除率达到18.18%,为微生物菌剂在海水养殖废水中的实际应用提供理论依据。
