Direct Conversion of Wheat Straw into Electricity with a Biomass Flow Fuel Cell Mediated by Two Redox Ion Pairs

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• 作者：Dr. Jian Gong ; Wei Liu ; Xu Du ; Dr. Congmin Liu ; Zhe Zhang ; Feifei Sun ; Le Yang ; Dr. Dong Xu ; Dr. Hua Guo and Dr. Yulin Deng
• 刊名：ChemSusChem
• 出版年：2017
• 出版时间：February 8, 2017
• 年：2017
• 卷：10
• 期：3
• 页码：506-513
• 全文大小：1474K
• ISSN：1864-564X

文摘

In this paper, a biomass flow fuel cell to directly convert wheat straw to electricity at low temperature (80–90 °C) and atmospheric pressure is presented. Two redox ion pairs, Fe³⁺/Fe²⁺ and VO₂⁺/VO²⁺, acting as redox catalysts and charge carriers, were used in the anode and cathode flow tanks, respectively. The wheat straw was first oxidized by Fe³⁺ in the anode tank at approximately 100 °C. The reduced Fe²⁺ in the anode was used to construct a fuel cell with VO₂⁺ in the cathode. The VO₂⁺ ions were reduced to VO²⁺ and regenerated to VO₂⁺ by oxygen oxidation. The wheat straw flow fuel cell showed a power output of 100 mW cm⁻². Mediated with liquid Fe³⁺ carriers, the solid powder of wheat straw could be gradually degraded into low-molecular-weight organic molecules and even oxidized to CO₂ at the anode without using noble-metal catalysts. The overpotential for the electrodes of the flow fuel cell was examined and the energy cost was estimated.