Water Soluble Polyoxometalate-based Photocatalytic Fuel Cell†

doi:10.7503/cjcu20160796

Abstract

Abstract:

A novel photocatalytic fuel cell using water soluble polyoxometalates(POM) as photocatalyst and charge carrier was built. The fuel oxidation in this study is a homogeneous decomposition reaction that occurred in electrolyte solution and the cell could generate electricity in dark. Using bio-glycerols as fuels, the power density of the photocatalytic fuel cell could reach 0.24 mW/cm². The cell worked steadily for nearly 50 h with current above 0.75 mA under continuous irradiation. Theoretically, the glycerol fuel can be either partially converted to aldehydes and acids, or fully converted to CO_x, depending on the degree of the oxidization reactions. Ultimately, this novel photoactivated hybrid fuel cell could expand fuel supply and utilization.

Key words: Fuel cell, Polyoxometalate, Photocatalysis, Glycerol, Biomass

CLC Number:

O644

TrendMD:

WU Weibing, LI Jian, LIU Congmin, ZHANG Lei, DAI Hongqi, LIU Wei. Water Soluble Polyoxometalate-based Photocatalytic Fuel Cell^†[J]. Chem. J. Chinese Universities, 2017, 38(6): 1082.

Figures/Tables 12

Fig.1 Comparison of traditional photocatalytic fuel cell with TiO2 photo anode(A) and water soluble polyoxometalates based photocatalytic fuel cell(B)

Fig.2 Voltage-current and power-current plots with different concentrations of PMo12c(Glycerol)=1 mol/L. Voltage: solid line;power density: dash line.

Fig.3 Voltage-current and power-current plots with different concentrations of glycerol c(PMo12)=28.1 mmol/L. Voltage: solid line; power density: dash line.

Fig.4 Voltage-current and power-current plots of five repeated irradiation-discharge cycles c(Glycerol)=1 mol/L; c(PMo12)=13.3 mmol/L. Voltage: solid line; power density: dash line.

Fig.5 Current curve of continuous performance test with(a) and without(b) light irradiation c(Glycerol)=1 mol/L; c(PMo12)=13.3 mmol/L.

Fig.6 Discharge current density-time plot in the cycles of light-irradiation and discharge The anode electrolyte was pretreated by light-irradiation for 7 h.

Fig.7 Typical structure of polyoxometalate H3PMo12O40(A) and schematic illustration of the principle of the photocatalytic fuel cell(B)

Fig.8 1H NMR spectra of pure glycerol(a) and glycerol-PMo12 complex(b)

Fig.9 Proposed reaction pathway for glycerol oxidation by photoexcited PMo12 in aqueous solution

Fig.10 1H NMR spectrum of glycerol and PMo12 after 5 h photocatalytic reactionc(Glycerol)=1 mol/L, c(PMo12)=13.3 mmol/L.

Table 1 Analysis of the emission gas*

Product	Molar fraction(%)
Helium	29.675
Oxygen	8.013
Nitrogen	27.528
Carbon monoxide	0.004
Carbon dioxide	0.126

Fig.11 Comparison of cell performance powered with different fuelsFuel: a. EtOH; b. glycol; c. glucose; d. DMF; e. ethylenediamine; f. oxalic acid.The initial feed concentrations for all fuels are: EtOH, glycol and glucose: 1 mol/L, DMF: 4 mol/L, ethylenediamine and oxalic acid: 0.5 mol/L; PMo12 13.3 mmol/L.

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