Direct Formate/Persulfate Microfluidic Fuel Cell with a Catalyst-Free Cathode and High Power Density,ACS Sustainable Chemistry & Engineering

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Direct Formate/Persulfate Microfluidic Fuel Cell with a Catalyst-Free Cathode and High Power Density
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-04-15 , DOI: 10.1021/acssuschemeng.1c00395
Qiao Lan _{1,

2} , Dingding Ye _{1,

2} , Xun Zhu _{1,

2} , Rong Chen _{1,

2} , Qiang Liao _{1,

2} , Tong Zhang _{1,

2} , Yuan Zhou _{1,

2}

Affiliation

Achieving high performance at low cost is crucial and difficult for microfluidic fuel cells (MFCs) as portable power sources. A direct formate microfluidic fuel cell (DFMFC) with a catalyst-free cathode and sodium persulfate as the oxidant is proposed. Due to the strong oxidizing property of sodium persulfate, a carbon paper electrode without a catalyst is used as the cathode directly, greatly reducing the manufacturing cost and ignoring the parasitic current generated from the fuel crossover. In addition, the advantages of the high theoretical potential, environmental friendliness, and good solubility of its reduction products make persulfate an excellent oxidant in MFCs. Moreover, by combining sodium persulfate in an acidic medium and formate in an alkaline medium, a high open-circuit voltage (OCV) of 2 V is yielded. By optimizing the flow rate and concentration of the reactants, the peak power density is 148 mW cm^–2, and the maximum current density is 450 mA cm^–2, which is the highest level among the previously reported similar microfluidic fuel cells. The DFMFC could stably operate during constant voltage discharge. Therefore, it has been demonstrated that a catalyst-free cathode with persulfate as the oxidant is a feasible approach to simultaneously achieve superior cell performance and low cost for MFCs.

中文翻译：

具有无催化剂阴极和高功率密度的直接甲酸酯/过硫酸盐微流体燃料电池

对于作为便携式电源的微流体燃料电池（MFC），以低成本实现高性能至关重要且困难。提出了一种具有无催化剂阴极和过硫酸钠作为氧化剂的直接甲酸微流燃料电池（DFMFC）。由于过硫酸钠具有很强的氧化性，无催化剂的碳纸电极直接用作阴极，大大降低了制造成本，并忽略了因燃料交叉产生的寄生电流。此外，高理论潜力，环境友好性及其还原产物的良好溶解度等优点使过硫酸盐成为MFC中的极佳氧化剂。此外，通过将过硫酸钠在酸性介质中和甲酸盐在碱性介质中混合，可获得2 V的高开路电压（OCV）。^–2，并且最大电流密度为450 mA cm ^–2，这是先前报道的类似微流体燃料电池中的最高水平。在恒定电压放电期间，DFMFC可以稳定运行。因此，已经证明，以过硫酸盐为氧化剂的无催化剂阴极是可行的方法，以同时获得优异的电池性能和低成本的MFC。

更新日期：2021-04-27

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