添加Sn的Ni-Al合金生物电化学制氢阴极催化剂

研究了添加Sn的Ni、Al合金粉作为低成本生物电化学制氢阴极催化剂的可行性,结果表明,Ni、Al、Sn的协同作用能够提高催化剂对氢的选择性。SEM分析显示,当Sn的含量为0、5%、10%时Ni-Al-Sn能够形成均一颗粒形貌;当Sn的含量为15%时,催化剂形成两种颗粒形貌。XRD分析显示,Sn的含量为0、5%、10%时催化剂中无金属锡,当Sn的含量为15%时催化剂中有金属Sn析出。Ni-Al-Sn催化剂与碳载Pt催化剂相比,尽管产气速率较低,但该类型催化剂对氢的选择性高,实验数据显示Ni50%、Al45%、Sn5%的催化剂为较好的生物电化学制氢催化剂。以该类型催化剂作为阴极催化剂的生物电化学装置可以代替污水处理中的厌氧系统,在处理污水的同时,产生部分氢气。

Use of Sn-doped Ni-Al alloys as low-cost cathode catalyst for H2 production in microbial electrolysis cells

The feasibility of using Sn-doped Al-Ni alloy powder as low-cost cathode catalyst for H2 production in microbial electrolysis cells (MEC)was studied.The synergism of Ni, Al and Sn could improve the hydrogen selectivity of catalyst.SEM photographs showed that Ni-Al-Sn alloy powders had a single morphology when the content of Sn was 0 , 5%, 10%, while two different appearances could be found when the content of Sn was 15%.XRD patterns indicated that only Ni-Al-Sn alloy phase could be detected in 0 , 5%, 10% Sn-doped Ni-Al alloy powders, while Sn could be detected besides the alloy phase for 15% Sn-doped Ni-Al alloy powders.Compared with platinum catalyst, although the alloy catalyst produced more slowly hydrogen gas, it had higher selectivity of hydrogen.The catalyst containing 50% Ni, 45% Al, 5% Sn was the better catalyst for H₂ production from MEC.MEC could replace the anaerobic system and produce hydrogen in the process of wastewater treatment.