The global commitment to pivoting to sustainable energy and products calls for technology development to utilize solar energy for hydrogen(H_(2))and value-added chemicals production by biomass photoreforming.Herein,a ...The global commitment to pivoting to sustainable energy and products calls for technology development to utilize solar energy for hydrogen(H_(2))and value-added chemicals production by biomass photoreforming.Herein,a novel dual-functional marigold-like Zn_(x)Cd_(1-x)S homojunction has been the production of lactic acid with high-yield and H_(2)with high-efficiency by selective glucose photoreforming.The optimized Zn_(0.3)Cd_(0.7)S exhibits outstanding H_(2)generation(13.64 mmol h^(-1)g^(-1)),glucose conversion(96.40%),and lactic acid yield(76.80%),over 272.80 and 19.21 times higher than that of bare ZnS(0.05 mmol h^(-1)g^(-1))and CdS(0.71 mmol h^(-1)g^(-1))in H_(2)generation,respectively.The marigold-like morphology provides abundant active sites and sufficient substrates accessibility for the photocatalyst,while the specific role of the homojunction formed by hexagonal wurtzite(WZ)and cubic zinc blende(ZB)in photoreforming biomass has been demonstrated by density functional theory(DFT)calculations.Glucose is converted to lactic acid on the WZ surface of Zn_(0.3)Cd_(0.7)S via the photoactive species·O_(2)^(-),while the H_(2)is evolved from protons(H^(+))in H_(2)O on the ZB surface of Zn_(0.3)Cd_(0.7)S.This work paves a promising road for the production of sustainable energy and products by integrating photocatalysis and biorefine.展开更多
以氯化镍、硫酸钴、硫代硫酸钠为反应物,通过水热法合成系列Ni_xCo_(1-x)S_2(x=0,0.1,0.3,0.5,0.7,0.9,1.0)粉体材料;采用X射线衍射光谱仪(XRD)、扫描电子显微镜(SEM)、激光粒度分布仪和差热分析仪(DTA)等对材料进行表征;采用粉末压片...以氯化镍、硫酸钴、硫代硫酸钠为反应物,通过水热法合成系列Ni_xCo_(1-x)S_2(x=0,0.1,0.3,0.5,0.7,0.9,1.0)粉体材料;采用X射线衍射光谱仪(XRD)、扫描电子显微镜(SEM)、激光粒度分布仪和差热分析仪(DTA)等对材料进行表征;采用粉末压片工艺将材料与锂硅合金和Li Cl-KCl(Mg O)熔盐电解质装配成单体电池,考察了Ni_xCo_(1-x)S_2正极材料中镍、钴的含量对其放电性能的影响.结果表明,当x=0.3时,Ni_xCo_(1-x)S_2正极材料在100 m A/cm2恒流放电时,单体电池放电电压可以达到1.899 V,截止电压为1.5 V时比容量为276.5 m A·h/g,放电过程中单体电池内阻较低,放电性能最好.展开更多
Cu_(2)ZnSnS_(4)薄膜因其元素地壳含量丰富、无毒且具有优异的光电性能,受到研究者的广泛关注。本文基于纳米墨水法用Cd部分取代Zn制成了Cu_(2)(Cd x Zn_(1-x))SnS_(4)(CCZTS)薄膜,研究退火时间和后退火温度对薄膜及其太阳电池性能的影...Cu_(2)ZnSnS_(4)薄膜因其元素地壳含量丰富、无毒且具有优异的光电性能,受到研究者的广泛关注。本文基于纳米墨水法用Cd部分取代Zn制成了Cu_(2)(Cd x Zn_(1-x))SnS_(4)(CCZTS)薄膜,研究退火时间和后退火温度对薄膜及其太阳电池性能的影响。研究结果表明,所制备的薄膜为CCZTS相,无其他杂相,薄膜表面平整且致密,结晶性较好。随着退火时间增加,薄膜的晶粒尺寸有所增大,薄膜太阳电池的pn结质量得到提升,其性能也随之提高。通过对薄膜太阳电池进行后退火处理,分析了吸收层的元素扩散对电池性能的影响,在Cd元素形成梯度分布时,电池性能有所提高。随着后退火温度的增加,其电池性能和pn结质量呈现先提高后下降的趋势。经后退火300℃处理后,电池转换效率最佳,为3.13%。展开更多
基金supported by the National Natural Science Foundation of China(No.32071713)the Outstanding Youth Foundation Project of Heilongjiang Province of China(JQ2019C001)。
文摘The global commitment to pivoting to sustainable energy and products calls for technology development to utilize solar energy for hydrogen(H_(2))and value-added chemicals production by biomass photoreforming.Herein,a novel dual-functional marigold-like Zn_(x)Cd_(1-x)S homojunction has been the production of lactic acid with high-yield and H_(2)with high-efficiency by selective glucose photoreforming.The optimized Zn_(0.3)Cd_(0.7)S exhibits outstanding H_(2)generation(13.64 mmol h^(-1)g^(-1)),glucose conversion(96.40%),and lactic acid yield(76.80%),over 272.80 and 19.21 times higher than that of bare ZnS(0.05 mmol h^(-1)g^(-1))and CdS(0.71 mmol h^(-1)g^(-1))in H_(2)generation,respectively.The marigold-like morphology provides abundant active sites and sufficient substrates accessibility for the photocatalyst,while the specific role of the homojunction formed by hexagonal wurtzite(WZ)and cubic zinc blende(ZB)in photoreforming biomass has been demonstrated by density functional theory(DFT)calculations.Glucose is converted to lactic acid on the WZ surface of Zn_(0.3)Cd_(0.7)S via the photoactive species·O_(2)^(-),while the H_(2)is evolved from protons(H^(+))in H_(2)O on the ZB surface of Zn_(0.3)Cd_(0.7)S.This work paves a promising road for the production of sustainable energy and products by integrating photocatalysis and biorefine.
文摘以氯化镍、硫酸钴、硫代硫酸钠为反应物,通过水热法合成系列Ni_xCo_(1-x)S_2(x=0,0.1,0.3,0.5,0.7,0.9,1.0)粉体材料;采用X射线衍射光谱仪(XRD)、扫描电子显微镜(SEM)、激光粒度分布仪和差热分析仪(DTA)等对材料进行表征;采用粉末压片工艺将材料与锂硅合金和Li Cl-KCl(Mg O)熔盐电解质装配成单体电池,考察了Ni_xCo_(1-x)S_2正极材料中镍、钴的含量对其放电性能的影响.结果表明,当x=0.3时,Ni_xCo_(1-x)S_2正极材料在100 m A/cm2恒流放电时,单体电池放电电压可以达到1.899 V,截止电压为1.5 V时比容量为276.5 m A·h/g,放电过程中单体电池内阻较低,放电性能最好.
文摘Cu_(2)ZnSnS_(4)薄膜因其元素地壳含量丰富、无毒且具有优异的光电性能,受到研究者的广泛关注。本文基于纳米墨水法用Cd部分取代Zn制成了Cu_(2)(Cd x Zn_(1-x))SnS_(4)(CCZTS)薄膜,研究退火时间和后退火温度对薄膜及其太阳电池性能的影响。研究结果表明,所制备的薄膜为CCZTS相,无其他杂相,薄膜表面平整且致密,结晶性较好。随着退火时间增加,薄膜的晶粒尺寸有所增大,薄膜太阳电池的pn结质量得到提升,其性能也随之提高。通过对薄膜太阳电池进行后退火处理,分析了吸收层的元素扩散对电池性能的影响,在Cd元素形成梯度分布时,电池性能有所提高。随着后退火温度的增加,其电池性能和pn结质量呈现先提高后下降的趋势。经后退火300℃处理后,电池转换效率最佳,为3.13%。
