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Study on Synthesis and Electrochemical Characteristics of Pd-based Anode Catalysts for Direct Borohydride Fuel Cell

Author: WangHong
Tutor: WangXianYou
School: Xiangtan University
Course: Physical and chemical
Keywords: Fuel cell Sodium borohydride Carbon Supported Pd - Au catalyst The core - shell structure of carbon sets Pd - Au catalyst Carbon Supported Pd - Co catalyst
CLC: TM911.4
Type: Master's thesis
Year: 2011
Downloads: 53
Quote: 0
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Abstract


The fuel cell is an electrochemical power generating device, it will be in the chemical fuel and oxidant can not by combustion but by an electrochemical reaction directly into electrical energy, the use of such power generation via protection of the environment is of great significance. Direct sodium borohydride fuel cell (DBFC) for its non-toxic, easy to store, received widespread attention as a high theoretical power density, low operating temperature and high voltage. Direct sodium borohydride fuel cell electrode reaction process BH4? Electro-oxidation and hydrolysis exist, the development of high performance on the anode catalyst to improve the electro-oxidation of the electron utilization has important significance. The current anode electro-catalyst to the noble metal Pt-based, but the utilization of the Pt catalyst electronic electronic theoretically difficult to achieve, and the cost is higher. This thesis is to find high catalytic activity, lower cost DBFC anode catalyst as the main objective to prepare the nano-sized carbon contained Pd-based DBFC, anode catalyst, and NaBH4 electrochemical oxidation behavior on the catalyst were studied. The main contents include the following aspects: 1. Impregnation-reduction were prepared by a particle size of about 5 nm face-centered cubic lattice Pd-Au nanoparticles with a diameter smaller than the nano-Au particles in the Au / C. The results showed that: Pd-Au / C catalyst can significantly improve the NaBH 4 of electrochemical oxidation activity and reduce the reaction overpotential. In the three kinds of Pd-Au / C catalyst, Pd 67 Au 33 / C BH 4 - electro-oxidation highest catalytic activity. Its direct NaBH of the anode catalyst 4 -H 2 O 2 fuel cell at a current density of 70 mA cm -2 < The maximum power density of 56.8 mW cm -2 / sup>. And to explore NaBH 4 concentration and temperature on direct NaBH the 4-H 2 O 2 fuel cell performance affected. (2) using a continuous reduction was prepared the Pd shell -Au core / C catalyst, the core-shell structure characterized by TEM, EDX, UV - visible spectroscopy test methods. The results showed that the nanoparticles are spherical and uniformly distributed on the the VXC-72R carbon black surface, the Pd layer having a thickness of 0.375 nm. And found that catalysts can improve the the NaBH 4 electrochemical oxidation catalytic activity and extend the electro-catalyst with the experimental time and not due to poisoning and deactivation. Its direct NaBH of the anode catalyst 4 -H 2 O 2 fuel cell voltage of 0.798 V, current density of 90 mA cm -2 at the highest power density of 71.8 mW cm -2 . 3 restored by dipping prepared by different Co content the Pd x -the Co 100-x catalyst. Co / C on NaBH 4 , there is no direct oxidation catalytic activity, but NaBH 4 Pd / C, Pd 90 Co 10 < / sub> / C, Pd 81 Co 19 / C, Pd 70 Co 30 / C and Pd < sub> 59 the Co 41 / C five electrodes on the oxidation peak current density does not decrease with increasing Co content. Which Pd 70 Co 30 / C the anode catalyst directly the NaBH 4 -H 2 the O 2 fuel cell performance Preferably, the current density of 95 mA cm -2 when obtained by the maximum power density of 72.98 mW cm -2 , the discharge capacity of the battery for 1.54 Ah g -1 .

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Chemical power sources,batteries, fuel cells > Fuel cell
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