微波法超快制备泡沫镍负载的Co/Zn氧化物增强硫离子氧化反应活性

Ultrafast preparation of Co/Zn oxide supported by nickel foam by microwave method enhances the oxidation activity of sulfion

本文通过微波法超快速制备了泡沫镍(NF)负载的Co/Zn复合氧化物(Co-Zn/NF)。XRD测试表明生成的Co/Zn复合氧化物具有低结晶度。采用线性扫描伏安法(LSV)测试了Co-Zn/NF在碱性条件下的电催化硫离子氧化性能。与泡沫镍负载的单金属氧化物(Co/NF和Zn/NF)相比,Co-Zn/NF表现出更好的催化性能。在含有1 mol·L^(-1)Na2S和1 mol·L^(-1)NaOH的电解液中,Co-Zn/NF达到100 m A·cm^(-2)的电流密度所需的电位仅为0.28 V vs RHE,并且在恒定100 m A·cm^(-2)的电流密度下,长时间工作35小时后仍保持高的催化性能。此外,组装非对称电解槽(阳极:硫离子氧化反应(sulfion oxidation reaction,SOR)用1 mol·L^(-1)Na2S和1mol·L^(-1)NaOH为电解质,阴极:析氢反应(hydrogen evolution reaction,HER)用1 mol·L^(-1)Na OH为电解质)进行双电极硫氧化辅助电解水制氢测试,与传统的碱性电解水相比,达到100 m A·cm^(-2)电流密度所需的能耗降低了46%。本工作为低能耗电化学制氢提供了一种新思路,并证明了SOR耦合HER电解水制氢具有实际应用的可行性。

In this work,the foam nickel(NF)supported Co/Zn composite oxide(Co-Zn/NF)is ultra-fast prepared based on the microwave heating method.XRD pattern shows that the generated Co/Zn composite oxide has low crystallinity.The LSV is used to perform the electrocatalytic sulfion oxidation reaction(SOR)performance of Co-Zn/NF under alkaline conditions.Compared to singlemetal oxides supported on foam nickel(Co/NF and Zn/NF),Co-Zn/NF exhibits better catalytic performance for SOR.In the 1 mol L^(-1)Na2S and 1 mol·L^(-1)NaOH electrolyte,the required potential of Co-Zn/NF to achieve a current density of 100 mA·cmis only 0.28 V vs RHE.Co-Zn/NF can also maintain high catalytic performance after long-term operation for 35 hours at a stationary current density of 100 mA·cm^(-2).In addition,we assemble an asymmetric electrolyzed(with 1 mol·L^(-1)Na,S and 1 mol·L^(-1)NaOH as the electrolyte for the anodic SOR and 1 mol·L^(-1)NaOH as the electrolyte for the cathodic hydrogen evolution reaction(HER))used for dual-electrode SOR-assisted water electrolysis for hydrogen production.Compared to traditional alkaline water electrolysis,the energy consumption required at a current density of 100 mA·cm^(-2)is reduced by 46%.This work provides a new approach for low-energy electrochemical hydrogen production and demonstrates the practical feasibility of the coupled SOR-HER system for hydrogen production.