介孔状氮掺杂CoP纳米线作为析氢反应催化剂

Mesoporous nitrogen-doped CoP NWs as a hydrogen evolution catalyst

以司班40(C_(22)H_(42) O_(6))、六水硝酸钴(Co(NO_(3))·6H_(2) O)、二水合草酸(H_(2) C_(2) O_(4)·2H_(2) O)、乙二醇为原料,通过共沉淀反应、高温热解、化学气相沉积(CVD)等方法制备了具有优异析氢反应(HER)催化性能的介孔状氮掺杂CoP纳米线催化剂(N-doped CoP NWs);通过X射线衍射(XRD)、透射电镜(TEM)、扫描电镜(SEM)和X射线光电子能谱(XPS)对催化剂的形貌和物相组成等进行详细表征。该催化剂在0.5 mol/L H_(2) SO_(4)溶液中进行析氢反应性能测试,当电流密度为10 mA/cm^(2)时,对应的过电势为117 mV,塔菲尔斜率为66 mV/dec,在经过3000圈循环伏安扫描之后,在10 mA/cm^(2)处的过电位仅仅下降了12 mV。该方法获得的催化剂,合成简单、性能优良;相较于传统析氢反应催化剂,原材料易得且价格低廉,具有规模性生产的实用意义。

A mesoporous nitrogen-doped CoP nanowires catalyst(N-doped CoP NWs)with excellent catalytic performance of hydrogen evolution reaction(HER)was prepared by co-precipitation,high temperature pyrolysis,chemical vapor deposition(CVD)from Span-40(C_(22) H_(42) O_(6)),cobalt hexahydrate(Co(NO_(3))·6H_(2) O),dihydrate oxalic acid(H_(2) C_(2) O_(4)·2H_(2) O)and ethylene glycol as raw materials.The morphology and phase composition of the catalyst were characterized by X-ray diffraction(XRD),transmission electron microscopy(TEM),scanning electron microscopy(SEM)and X-ray photoelectron spectroscopy(XPS).The catalyst was tested for HER performance in 0.5 mol/L H_(2)SO_(4) solution.When the current density was 10 mA/cm^(2),the corresponding overpotential was 117 mV and the Tafel slope was 66 mV/dec.After 3000 cycles of cyclic voltammetry scanning,the overpotential at 10 mA/cm^(2) only decreased by 12 mV.The catalyst obtained by this method has simple synthesis and excellent performance.Compared with the traditional catalyst for hydrogen evolution reaction,its raw materials are readily available and cheap,so it has practical significance for scale production.