Preparation And Control Of FeCoNiP/Vertical Graphene As High-efficient Overall Water Splitting Electrocatalyst

Under the circumstance of energy crisis,the development of sustainable clean energy is of great significance for our country.Among all sustainable clean energies,hydrogen energy is regarded as“future fuel”for its high calorific value and pollutant-free characteristics.Water splitting,which is known as the only pollutant-free industrial way for generating mass hydrogen,possesses outstanding potential for application.However,the exist of overpotential and the worse stability of noble metal-based commercial electrocatalysts like Pt/C and Ir/Ru O₂ restrict the large-scale application of water splitting.The synthesis and control of non-noble metal-based electrocatalysts with remarkable catalytic performances and stabilities towards overall water splitting is very important for the large-scale application of water splitting.Recently,iron group metal phosphides are popular as electrocatalysts towards overall water splitting because of its controllable component and outstanding catalytic performances and stabilities.In this thesis,a freeze-casting method is used for the synthesis of vertical aligned graphene array（Vr GO）,an outstanding substrate that possesses big surface area,outstanding conductivity and mass transfer capacity.And Fe₁Co_xNi_yP nanoparticles are successfully prepared on Vr GO by electroless plating.Fe₁Co_xNi_yP/Vr GO electrocatalysts show widely different on the catalytic performance towards overall water splitting at a wide p H range.The cationic ratio of Co and Ni plays significant role on influencing the catalytic performance,and this result is proved by the survey of X-ray photoelectron spectrometer.In addition,Fe Co Ni P nanoparticles with best cationic ratio of Co and Ni with phosphorous-doped vertical graphene（PVG）is successfully prepared on Cu substrate by a facile one-step electrodeposition method.The Fe Co Ni P/PVG/Cu electrocatalyst displays fabulous catalytic performances and stabilities towards overall water splitting at a wide p H range.The phosphorous that doped into graphene plays crucial role in tuning the electronic structure of Fe Co Ni P,thus enhancing the catalytic performance of it.Finally,through the comparison and discussion of the results of the above two works,the decisive factors that affecting the electrocatalytic performance of non-noble metal-based electrocatalysts are analyzed,which provides ideas and guidance for the preparation and control of such electrocatalysts.This thesis is expected to contribute to the large-scale application of water splitting for generating mass hydrogen.