Co2Ni1O4/不锈钢复合材料的制备及其电催化析氧性能

电解水包括析氢反应(HER)与析氧反应(OER)，由于OER是复杂的4电子转移过程，制作出具有优异耐久性的高活性的非贵金属OER电催化剂对于电解水至关重要。为了降低成本，选择304型不锈钢网(SS)作为基体，使用电沉积的方法制备钴-镍双氢氧化物，利用真空煅烧的方法制备钴-镍氧化物。使用XRD、SEM、TEM、XPS和电化学工作站对Co₂Ni₁O₄/SS复合材料的晶体结构、形貌和电催化OER性能进行了研究。结果表明:电沉积制备的钴-镍双氢氧化物煅烧之后转变成尖晶石结构的钴-镍氧化物；在不锈钢表面成功合成了大量密集的层状结构；在1.0 mol/L KOH电解液中，Co₂Ni₁O₄/SS电极表现出优异的OER电催化性能，达到10 mA·cm?2电流密度时所需要的过电位仅为240 mV，Tafel斜率为53.92 mV·dec?1，并且表现出优异的稳定性。 

Synthesis and electrocatalytic oxygen evolution performances of Co2Ni1O4/stainless steel composites

Electrolytic water includes hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), because OER is a complex 4-electron transfer process, developing highly active non-precious OER electrocatalysts with superior durability is crucial to electrolytic water. In order to reduce the cost, 304 stainless steel mesh (SS) was selected as the matrix, Co-Ni double hydroxides was prepared by electrodeposition, Co-Ni oxides were produced by vacuum calcination. The crystal structure, morphology and electrocatalytic OER performance of Co₂Ni₁O₄/ SS composite were studied by XRD, SEM, TEM, XPS and electrochemical workstation. As a result, the Co-Ni double hydroxides prepared by electrodeposition are transformed into Co-Ni oxides with spinel structure after vacuum calcination; successfully synthesized a large number of dense layered structures on the surface of stainless steel;the Co₂Ni₁O₄/SS electrode exhibits an outstanding OER catalytic activity with an overpotentials of 240 mV at 10 mA·cm?2 and a Tafel slop as low as 53.92 mV·dec?1 in 1.0 mol/L KOH. In addition, the Co₂Ni₁O₄/SS composites shows excellent stability in the alkaline electrolyte.