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2017 ; 7
(1
): 5142
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Advanced redox flow fuel cell using ferric chloride as main catalyst for complete
conversion from carbohydrates to electricity
#MMPMID28698567
Xu F
; Li H
; Liu Y
; Jing Q
Sci Rep
2017[Jul]; 7
(1
): 5142
PMID28698567
show ga
Liquid catalyzed fuel cell (LCFC) is a kind of redox flow fuel cell directly
converting carbohydrates to electricity. To improve its efficiency, ferric
chloride (FeCl(3)) was introduced as main catalyst. As mono catalyst,
phosphomolybdic acid (PMo(12)) was much better than phosphotungstic acid (PW(12))
and FeCl(3) was intermediate between them. Compared with PMo(12) at the optimal
dose of 0.30?mol/L, the combination of FeCl(3) (1.00?mol/L) and PW(12)
(0.06?mol/L) achieved similar power output from glucose (2.59?mW/cm(2)) or starch
(1.57?mW/cm(2)), and even improved the maximum power density by 57% from 0.46 to
0.72?mW/cm(2) when using cellulose as the fuel. Long-term continuous operation of
the LCFC indicated that carbohydrates can be hydrolyzed to glucose and then
oxidized stepwise to carbon dioxide. At the latter stage, there was a linear
relationship between the electron transfer number from glucose to catalyst and
the subsequent cell performance. Based on these findings, the contribution of
FeCl(3) to LCFC should be derived from the accelerated hydrolysis and oxidation
of carbohydrates and the enhanced electron transfer from glucose to anode. The
addition of FeCl(3) reduced the usage of polyoxometalates by 80%, and the
replacement implied that LCFC can be operated less toxically and more
economically.