Multiscale design for high-performance glycolic acid electro-synthesis cell: Preparation of nanoscale-IrO2-applied Ti anode and optimization of cell assembling
Multiscale design for high-performance glycolic acid electro-synthesis cell: Preparation of nanoscale-IrO2-applied Ti anode and optimization of cell assembling
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DOI：
10.1016/j.cattod.2019.03.071
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发表时间：
2020-07-01
期刊：
影响因子：
5.3
通讯作者：
Yamauchi, Miho
中科院分区：
文献类型：
--
作者：
Fukushima, Takashi;Higashi, Manabu;Yamauchi, Miho
采用多尺度方法提高了使用乙醇酸(GC)/草酸(OX)氧化还原电偶的聚合物电解质醇电合成电池(PEAEC)的性能，即通过使用纳米级IrO2催化剂提高阳极上的反应速度，并通过优化电池结构来提高GC生成的选择性，即毫米级方法。我们制备了纳米IrO2阳极催化剂，它是由IrO2纳米粒子(d=3.7+/-1.8 nm)及其团聚体(d<；200 nm)组成的混合物。水氧化的线性扫描伏安测试表明，沉积在多孔碳纸上的纳米IrO2催化剂比用商业微米级IrO2颗粒组成的阳极得到的水氧化过电位降低了196 mV。此外，纳米IrO2催化剂在多孔钛纸上的应用不仅提高了耐久性，而且还加倍提高了水氧化性能。我们研究了由纳米级IrO2加钛阳极组成的各种PEAEC结构。纳米和毫米尺度的PEAEC制备GC的效率最高，在1.8V时能量转换效率为59.4%，法拉第效率为97.1%，对于在PEAEC工作温度(60℃)下几乎饱和的水溶液3M OX，其转化效率为98.9%。
Performance of a polymer electrolyte alcohol electrosynthesis cell (PEAEC) using a glycolic acid (GC)/oxalic acid (OX) redox couple was enhanced via the multiscale approach, i.e., increase of reaction rate on an anode by employing nanometer-scale (nanoscale) IrO2 catalysts and increase of selectivity for GC production via optimization of cell structures, i.e., a millimeter-scale approach. We prepared nanoscale IrO2 anode catalyst, which is mixture of IrO2 nanoparticles (d = 3.7 +/- 1.8 nm) and their agglomerates (d < 200 nm). The linear sweep voltammetry measurement for water oxidation revealed that the nanoscale IrO2 catalyst deposited on a porous carbon paper reduces overpotential for water oxidation by 196 mV from that obtained with an anode composed of commercial microscale IrO2 grans. Furthermore, application of the nanoscale IrO2 catalyst on porous titanium paper not only improved durability but also doubly enhanced water oxidation performance. We examined various PEAEC architectures composed of the nanoscale IrO2 applied Ti anode. Both nanometer- and millimeter-scale approaches realized the best PEAEC performance for GC production, i.e., 59.4% of energy conversion efficiency with 97.1% of Faradaic efficiency for the GC production at 1.8 V and 98.9% of conversion for 3 M OX, which is an almost saturated aqueous solution at operating temperature of the PEAEC (60 degrees C).