Optimization of NiMo catalyst for hydrogen production in microbial electrolysis cells
Optimization of NiMo catalyst for hydrogen production in microbial electrolysis cells
复制标题
DOI：
10.1016/j.ijhydene.2010.01.131
复制
发表时间：
2010-04
影响因子：
7.2
通讯作者：
Hongqiang Hu;Yanzhen Fan;Hong Liu
中科院分区：
文献类型：
--
作者：
Hongqiang Hu;Yanzhen Fan;Hong Liu
非铂基阴极是近年来发展起来的一种在碳布上电沉积NiMo的新型阴极材料，在微生物电解槽（MEC）中表现出良好的析氢电催化活性。为了进一步优化电沉积条件，本研究系统地研究了电解液组成、施加电流密度和电沉积时间的影响。开发的NiMo催化剂，其特征在于与扫描电子显微镜（SEM）和能量色散谱（EDS）和评价使用计时电位法和MEC。确定了在碳布上电沉积NiMo的最佳工艺条件为：镀液中Mo/Ni质量比为0.65，电流密度为50 mA/cm 2，电沉积时间为10 min。在此条件下，NiMo催化剂的化学式为Ni 6 MoO 3，形貌为球状。碳布上的NiMo负载量降低到1.7mg/cm 2，使用所开发的NiMo阴极的MEC的性能与具有类似负载量的Pt阴极相当。该结果表明，与使用Pt催化剂相比，可以实现低得多的阴极制造成本，从而显著提高MEC技术的经济可行性。
Non-platinum based cathodes were recently developed by electrodepositing NiMo on carbon cloth, which demonstrated good electrocatalytic activity for hydrogen evolution in microbial electrolysis cells (MECs). To further optimize the electrodeposition condition, the effects of electrolyte bath composition, applied current density, and duration of electrodeposition were systematically investigated in this study. The developed NiMo catalysts were characterized with scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) and evaluated using chronopotentiometry and in MECs. The optimal condition for electrodeposition of NiMo on carbon cloth was determined as: a Mo/Ni mass ratio of 0.65 in electrolyte bath, an applied current density of 50mA/cm2and electrodeposition duration of 10min. Under this condition, the NiMo catalyst has a formula of Ni6MoO3with a nodular morphology. The NiMo loading on the carbon cloth was reduced to 1.7mg/cm2and the performance of MEC with the developed NiMo cathode was comparable to that with Pt cathode with a similar loading. This result indicates that a much lower cathode fabrication cost can be achieved compared to that using Pt catalyst, and thereby significantly enhancing the economic feasibility of the MEC technology.