非贵金属催化的碱性硫离子燃料电池放电特性

摘要

The choice of fuel is an important issue influencing the selection of catalyst,cost,and commercialization of fuel cells.Electrochemically-active and low-cost fuels that can be oxidized by non-precious catalysts are an attractive objective.The native electrochemical activity and low cost of sulfide make it a suitable candidate.Fuel cells using alkaline sulfide as a fuel were developed.At room temperature,a single cell containing non-precious anode catalysts achieves a maximum power density of 12.3 mW· cm-2 with a current density of 42.8 mA· cm-2.Life tests show that alkaline sulfide fuel cells exhibit good durability.Ion chromatography detected considerable amounts of thiosulfate,sulfite,and sulfate.The deep oxidation and high capacity of sulfide make it an attractive fuel candidate.Compared with other fuels,sulfide has the advantages of being inexpensive,easy to transport,possesses high electrochemical activity,and can be catalyzed by non-precious catalysts.%燃料的选择对于燃料电池电极催化剂的选择、燃料电池的成本及其商业化有着至关重要的影响寻求电化学活性好、成本低,并且能够为非贵金属催化剂所催化的燃料是一项有前景的工作.硫离子的电化学活性及其低成本使之成为一个具有吸引力的选择.本文以碱性硫离子作为燃料构建了碱性硫离子燃料电池.在室温条件下,单体电池在以非贵金属为催化剂的条件下获得了12.3 mW· cm-2的功率密度,此时的电流密度达到了42.8 mA·cm-2; 50 h寿命测试显示了碱性硫离子燃料电池良好的稳定性.此外,通过离子色谱分析,在放电产物中检测到了硫代硫酸盐、亚硫酸盐以及硫酸盐.深度氧化使得硫离子具有更高的放电容量.与之前研究的燃料相比,硫离子具有成本低、运输容易、电化学活性高并且能够被非贵金属催化剂催化的优点.