首先以尿素为原料通过高温煅烧得到氮掺杂碳纳米片(NCN),然后采用浸渍还原法制备了氮掺杂碳纳米片载钴催化剂(Co/NCN)。通过扫描电镜、透射电镜、选区电子衍射等手段对NCN进行表征,发现NCN具有片层结构。通过透射电镜、能量色散X射线光谱、X射线光电子能谱对Co/NCN进行了表征,结果表明制备了Co/NCN。利用循环伏安法(CV)、计时电流法(CA)对催化剂的电化学性能进行了测试,同时对比了Co/NCN催化剂与石墨烯载钴催化剂、氮掺杂石墨烯载钴催化剂的催化性能,结果表明,Co/NCN催化剂对硼氢化钠的电催化氧化具有最好的催化活性和稳定性,在直接硼氢化钠燃料电池领域具有广阔的应用前景。
First,nitrogen-doped carbon nanosheets (NCN) were prepared by calcination of urea.Then,the nitrogen-doped carbon nanosheets supported cobalt catalyst (Co/NCN) was prepared by impregnation reduction method.The morphology of NCN was characterized by scanning electron microscopy,transmission electron microscopy,selected area electron diffraction,and so on.It was found that NCN had lamellar structure.Co/NCN was characterized by transmission electron microscopy,energy dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy,and the results showed that Co/NCN was successfully prepared.The electrochemical performance of the catalyst was tested by cyclic voltammetry (CV) and chronoamperometry (CA),and the catalytic performance of the Co/NCN catalyst was compared with that of graphene supported cobalt catalyst and nitrogen doped graphene supported cobalt catalyst.The results shown that the Co/NCN catalyst had bestcatalytic activity and stability for the electrocatalytic oxidation of sodium borohydride(NaBH4),and had broad application prospects in the field of direct NaBH4 fuel cell.
[1] Debe M K.Electrocatalyst approaches and challenges for automotive fuel cells[J].Nature,2012,486:43-51.
[2] 易兰花.直接硼氢化钠—过氧化氢燃料电池阳极纳米催化剂的研究[D].湘潭:湘潭大学,2013.
[3] Amendola S C,Onnerud P,Kelly M T,et al.A novel high power density borohydride-air cell[J].Journal of Power Sources,1999,84:130-133.
[4] Oshchepkov A,Bonnefont A,Maranzana G Ü,et al.Direct borohydride fuel cells:a selected review of their reaction mechanisms,electrocatalysts,and influence of operating parameters on their performance[J].Current Opinion in Electrochemistry,2022,32:100883.
[5] Saha S,Gayen P,Wang Z,et al.Development of bimetallic PdNi electrocatalysts toward mitigation of catalyst poisoning in direct borohydride fuel cells[J].ACS Catalysis,2021,11(14):8417-8430.
[6] Ma J,Li J,Yang S,et al.Ultrathin veil-like SnO2 supported Co3O4 nanoparticles for direct borohydride fuel cell anode[J].Journal of Power Sources,2020,453:227866.
[7] Oshchepkov A G,Braesch G,Ould-Amara S,et al.Nickel metal nanoparticles as anode electrocatalysts for highly efficient direct borohydride fuel cells[J].ACS Catalysis,2019,9(9):8520-8528.
[8] Song C,Wang G,Li B,et al.A novel electrode of ternary CuNiPd nanoneedles decorated Ni foam and its catalytic activity toward NaBH4 electrooxidation[J].Electrochimica Acta,2019,299:395-404.
[9] Zhang J,Zhang D,Cui C,et al.Three-dimensional porous Co-P alloy supported on copper foam as a new catalyst for sodium borohydride electrooxidation[J].Dalton Transactions,2019,48(35):13248-13259.
[10] Guo M,Cheng Y,Yu Y,et al.Ni-Co nanoparticles immobilized on a 3D Ni foam template as a highly efficient catalyst for borohydride electrooxidation in alkaline medium[J].Applied Surface Science,2017,416:439-445.
[11] Cardoso D S P,Santos D M F,Šljukić B,et al.Platinum-rare earth cathodes for direct borohydride-peroxide fuel cells[J].Journal of Power Sources,2016,307:251-258.
[12] Zhang D M,Ye K,Cao D X,et al.Co@MWNTs-plastic:a novel electrode for NaBH4 oxidation[J].Electrochimica Acta,2015,156:102-107.
[13] Valiollahi R,Ojani R,Raoof J B.Gold nano-cages on graphene support for sodium borohydride electrooxidation[J].Electrochimica Acta,2016,191:230-236.
[14] Guo D H,Shibuya R,Akiba C,et al.Active sites of nitrogen-doped carbon materials for oxygen reduction reaction clarified using model catalysts[J].Science,2016,351(6271):361-365.
[15] 陈康,柳璐,张蓉,等.铁/氮共掺杂碳催化剂的制备及其电催化氧还原性能研究[J].化工新型材料,2020,48(5):181-186,191.
[16] Liu Q,Duan Y,Zhao Q,et al.Direct synthesis of nitrogen-doped carbon nanosheets with high surface area and excellent oxygen reduction performance[J].Langmuir,2014,30(27):8238-8245.
基金资助
国家自然科学基金(21763019);江西省教育厅科技项目(GJJ202614);南昌师范学院学生科研项目(19XSKY47)
PDF
