The design and construction of low‐cost and high‐performance hybrid materials for the photocatalytic hydrogen production reaction(HER)are extremely important for the large‐scale application of hydrogen energy.Metal...The design and construction of low‐cost and high‐performance hybrid materials for the photocatalytic hydrogen production reaction(HER)are extremely important for the large‐scale application of hydrogen energy.Metal‐organic frameworks(MOFs)are considered to be potential photocatalytic materials.Herein,monodisperse,small size,non‐precious metal transition metal phosphide Ni2P is encapsulated into a typical MOF(UiO‐66‐NH2)as a hybrid core‐shell cocatalyst to modify Zn_(0.5)Cd_(0.5)S for photocatalytic hydrogen production.Ni2P is wrapped in UiO‐66‐NH_(2)via an in situ solvothermal method,and Zn_(0.5)Cd_(0.5)S sulfide is decorated with a core‐shell Ni_(2)P@UiO‐66‐NH_(2)cocatalyst to obtain ternary Ni_(2)P@UiO‐66‐NH_(2)/Zn_(0.5)Cd_(0.5)S composite materials.Photoelectric and chemical characterization confirms that the ternary composites have good kinetic hydrogen production performance.The hydrogen production rate of 10%10 mg Ni_(2)P@UiO‐66‐NH_(2)/Zn_(0.5)Cd_(0.5)S reaches 40.91 mmol·g^(–1)·h^(–1)with an apparent quantum efficiency at 420 nm of 13.57%.The addition of 10 mg Ni_(2)P@UiO‐66‐NH_(2)increases the surface area of the ternary material,providing abundant reaction sites and forming an efficient charge transfer channel,which is conducive to efficient hydrogen production by the ternary photocatalysts.It is shown that the formation of a ternary composite system is beneficial to the occurrence of an efficient catalytic reaction.This study provides a new perspective for the construction of high‐performance photocatalytic materials.展开更多
文摘以镍为金属中心、对二甲苯二磷酸为有机配体,构筑了一种有机磷酸类Ni-MOF前驱体,再经过一步碳化,原位制备出多孔碳包覆Ni_2P纳米颗粒的复合材料.该复合材料保留了前驱体的片状形貌,比表面积可达202 m2/g,复合材料中的Ni_2P纳米颗粒具有良好的结晶度,颗粒均匀且无团聚现象.在锂离子电池性能测试中,该Ni_2P/C复合结构在缓解材料体积膨胀的同时提高了材料的电子和离子电导率,进而提高了材料的电化学性能.在0.2 C的电流密度下,材料首次充、放电比容量分别为247和226 m A·h·g-1,库仑效率可达91.7%,循环200圈后,库仑效率接近100%.
文摘The design and construction of low‐cost and high‐performance hybrid materials for the photocatalytic hydrogen production reaction(HER)are extremely important for the large‐scale application of hydrogen energy.Metal‐organic frameworks(MOFs)are considered to be potential photocatalytic materials.Herein,monodisperse,small size,non‐precious metal transition metal phosphide Ni2P is encapsulated into a typical MOF(UiO‐66‐NH2)as a hybrid core‐shell cocatalyst to modify Zn_(0.5)Cd_(0.5)S for photocatalytic hydrogen production.Ni2P is wrapped in UiO‐66‐NH_(2)via an in situ solvothermal method,and Zn_(0.5)Cd_(0.5)S sulfide is decorated with a core‐shell Ni_(2)P@UiO‐66‐NH_(2)cocatalyst to obtain ternary Ni_(2)P@UiO‐66‐NH_(2)/Zn_(0.5)Cd_(0.5)S composite materials.Photoelectric and chemical characterization confirms that the ternary composites have good kinetic hydrogen production performance.The hydrogen production rate of 10%10 mg Ni_(2)P@UiO‐66‐NH_(2)/Zn_(0.5)Cd_(0.5)S reaches 40.91 mmol·g^(–1)·h^(–1)with an apparent quantum efficiency at 420 nm of 13.57%.The addition of 10 mg Ni_(2)P@UiO‐66‐NH_(2)increases the surface area of the ternary material,providing abundant reaction sites and forming an efficient charge transfer channel,which is conducive to efficient hydrogen production by the ternary photocatalysts.It is shown that the formation of a ternary composite system is beneficial to the occurrence of an efficient catalytic reaction.This study provides a new perspective for the construction of high‐performance photocatalytic materials.
