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Direct glucose anion exchange membrane fuel cell (AEMFC) with near-neutral-state electrolyte of
0.1 M [PO4] tot was studied with five different anode electrocatalysts (Pt, PtRu, PtNi, Au, PdAu) at a
temperature of 37 oC and at a glucose concentration of 0.1 M. The cathode catalyst in each test was Pt
supported on carbon (60 wt.%). Four anode electr...
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Context 1
... main device is shown in Fig. 1. This was made up of the plate type cell configuration (by Fuel Cell Technologies, USA) having a geometrical area of the electrodes of 5 cm 2 . The flow channels on the surface of the anode graphite block in contact with the anode were widened in order to increase the flow of the fuel to the anode and operate at a moderate pressure. An ...
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This work covers the direct glucose anion exchange membrane fuel cell (AEMFC) with near-neutralstate electrolyte of 0.1 M [PO4] tot having two high-performing anode electrocatalysts (Pt and PtNi) at 37 oC and at a glucose concentration of 0.1 M. The cathode catalyst in each test was a Pt supported on carbon (60 wt.%). The PtNi/C had a total metal c...
Citations
... So far the electrochemical oxidation of glucose has occurred with at most two electron transfer in different fuel cells, when the maximum number of the available electrons is 24 per one glucose molecule [1][2][3]. Our reported tests with both the direct glucose cylinder and the rectangular (flat) type anion exchange membrane fuel cells (AEMFC) confirm previous results that at the most only two electrons are extracted during electrochemical oxidation of glucose in a near-neutral-state electrolyte [4][5][6]. Thus, it has to be admitted that a single fuel cell with a certain anodecathode pair is ineffective for achieving a high degree of oxidation of glucose, which can theoretically provide the transfer of 24 electrons per molecule. This is due to facts that the used anode catalysts are either unselective towards the oxidation products of glucose or these catalysts are being poisoned by these oxidation products [7][8]. ...
... This is due to facts that the used anode catalysts are either unselective towards the oxidation products of glucose or these catalysts are being poisoned by these oxidation products [7][8]. In this work, we continue the research on the direct glucose AEMFC from the point of view of our earlier reported studies [6]. At first, we describe the optimization of the Pt and PtNi as anodes for the oxidation of glucose and as assembled further in the AEMFC. ...
... The main equipment that were applied in this work are shown in Fig. 1. The main equipment were similar to the devices in our previous work [6] except for the second added test fuel cell equipment. Electronic devices and connections including the PI controller for the electronic load and the TIC controller for heating the electrodes of the fuel cells were also analogous as were used earlier in the single fuel cell [6]. ...
This work covers the direct glucose anion exchange membrane fuel cell (AEMFC) with near-neutralstate electrolyte of 0.1 M [PO4] tot having two high-performing anode electrocatalysts (Pt and PtNi) at 37 oC and at a glucose concentration of 0.1 M. The cathode catalyst in each test was a Pt supported on carbon (60 wt.%). The PtNi/C had a total metal content of 40 wt.% and the Pt/C 60 wt.%. The operation of the AEMFC was controlled by means of an in-house made electronic load with PIcontroller (i.e. a feedback controller, which has proportional and integral action on control error signal). There were two primary objectives with this study. At first, to find out how the electrode modifications of the anode (i.e. by increasing the thicknesses of these electrodes by adding extra carbon) affect the Coulombic efficiency (CE, based on the exchange of two electrons) and the specific energy (SPE, Wh kg-1) values of the direct glucose AEMFC. Secondly, investigate how a two-stage fuel cell system with two fuel cells concatenated and used one after the other for the electrochemical oxidation of glucose, influence the CE and SPE values. The results show that the modified PtNi anode shows superior results for the AEMFC compared to our earlier results. As for the two-stage fuel cell system, it increased the average electric power (mWh) and SPE when compared to single fuel cell systems except when the higher selective anode catalyst (Pt) was used in the first fuel cell prior to the fuel cell in the second fuel cell containing the lower selective anode catalyst (PtNi).
The utilization of biomass sugars has received great interesting recently. Herein, we present a highly efficient hybrid solar biomass fuel cell that utilizes thermal‐ and photocatalysis of solar irradiation and converts biomass sugars into electricity with high power output. The fuel cell uses polyoxometalates (POMs) as photocatalyst to decompose sugars and capture their electrons. The reduced POMs have strong visible and near‐infrared light adsorption, which can significantly increase the temperature of the reaction system and largely promotes the thermal oxidation of sugars by the POM. In addition, the reduced POM functions as charge carrier that can release electrons at the anode in the fuel cell to generate electricity. The electron‐transfer rates from glucose to POM under thermal and light‐irradiation conditions were investigated in detail. The power outputs of this solar biomass fuel cell are investigated by using different types of sugars as fuels, with the highest power density reaching 45 mW cm−2. Hybrid solar biomass fuel cell: A solar and biomass hybrid fuel cell that combines thermal and photocatalytic effects of solar irradiation highly efficiently generates electricity from biomass sugars. The ability of the reduced polyoxometalates (POMs) in the fuel cell to absorb light increases the temperature of the reaction system, which promotes thermal oxidation of sugars; in addition, the reduced POM acts as charge carrier that releases electrons at the anode (POM‐I=H3[PMo12O40], POM‐II=H12P3Mo18V7O85).
Fabrication of electrocatalyst for direct glucose fuel cell (DGFC) operation involves destructive preparation methods with the use of stabilizer like binder, which may cause activity depreciation. Binder-free electrocatalytic electrode becomes a possible solution to the above problem. Binder-free bimetallic Pd-Pt loaded graphene aerogel on nickel foam plates with different Pd/Pt ratios (1:2.32, 1:1.62, and 1:0.98) are successfully fabricated through a green one-step mild reduction process producing a Pd-Pt/GO/nickel form plate (NFP) composite. Anode with the binder-free electrocatalysts exhibit a strong activity in a batch type DGFC unit under room temperature. The effects of glucose and KOH concentrations, and the Pd/Pt ratios of the electrocatalyst on the DGFC performance are also studied. Maximum power density output of 1.25 mW cm⁻² is recorded with 0.5 M glucose/3 M KOH as the anodic fuel, and Pd1Pt0.98/GA/NFP as catalyst, which is the highest obtained so far among other types of electrocatalyst.
