期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 2, 期 9, 页码 2211-2216出版社
AMER CHEMICAL SOC
DOI: 10.1021/sc5004133
关键词
Reverse electrodialysis; Ammonium bicarbonate; Hydrogen evolution reaction; Waste acid neutralization
资金
- National Science Foundation Graduate Research Fellowship Program (NSF) [DGE1255832]
- King Abdullah University of Science and Technology (KAUST) [KUS-I1-003-13]
Waste acid streams produced at industrial sites are often co-located with large sources of waste heat (e.g., industrial exhaust gases, cooling water, and heated equipment). Reverse electrodialysis (RED) systems can be used to generate electrical power and hydrogen gas using waste heat-derived solutions, but high electrode overpotentials limit system performance. We show here that an ammonium bicarbonate (AmB) RED system can achieve simultaneous waste acid neutralization and in situ hydrogen production, while capturing energy from excess waste heat. The rate of acid neutralization was dependent on stack flow rate and increased 50x (from 0.06 +/- 0.04 to 3.0 +/- 032 pH units min(-1) m(-2) membrane), as the flow rate increased 6x (from 100 to 600 mL min(-1)). Acid neutralization primarily took place due to ammonium electromigration (37 +/- 4%) and proton diffusion (60 +/- 5%). The use of a synthetic waste acid stream as a catholyte (pH approximate to 2) also increased hydrogen production rates by 65% (from 5.3 +/- 0.5 to 8.7 +/- 0.1 m(3) H-2 m(-3) catholyte day(-1)) compared to an AmB electrolyte (pH approximate to 8.5). These findings highlight the potential use of dissimilar electrolytes (e.g., basic anolyte and acidic catholyte) for enhanced power and hydrogen production in RED stacks.
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