Highly stable ternary tin-palladium-platinum catalysts supported on hydrogenated TiO2 nanotube arrays for fuel cells
Highly stable ternary tin-palladium-platinum catalysts supported on hydrogenated TiO2 nanotube arrays for fuel cells
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DOI：
10.1039/c3nr01086d
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发表时间：
2013-01-01
期刊：
影响因子：
6.7
通讯作者：
Yi, Baolian
中科院分区：
文献类型：
--
作者：
Zhang, Changkun;Yu, Hongmei;Yi, Baolian
本文采用高压甲醇还原法制备了Pt纳米晶体，并将其合成到经Sn/Pd预处理的氢化TiO2纳米管阵列上。然后采用氢处理法制备了Sn/Pd/Pt三元催化剂。直径约为18 nm的复合催化剂均匀分布在内层纳米管上。结合氢化TiO2纳米管阵列的新型催化剂具有优异的电催化活性和高耐久性。在0 ~ 1.2 V / RHE范围内循环18000次后，催化剂的电化学性能达到最大值，在18000次循环时，催化剂的电化学表面积约为136 m(2) g(Pt+Pd)(-1)，是商用JM Pt/C (104 m(2) g（Pt)(-1)）的1.3倍。此外，在增加7300个电位循环（共24300个循环）后，催化剂的电化学表面积几乎没有减少。在全电池测试中，这种超低铂负载（0.043 mg cm(-2)）的新型电极用作燃料电池的阴极时，产生的功率为1.21 kW g(Pt)（-1）。
Herein the Pt nanocrystals were synthesized by a high-pressure methanol reduction method onto the hydrogenated TiO2 nanotube arrays pre-treated by Sn/Pd. Then Sn/Pd/Pt ternary catalysts were fabricated by hydrogen treatment. The composite catalysts with a diameter of about 18 nm were located uniformly at the inner nanotubes. The novel catalyst combined with hydrogenated TiO2 nanotube arrays exhibits excellent electro-catalytic activity and high durability. The electrochemical performance of the catalysts after 18 000 potential cycles between 0 and 1.2 V vs. RHE could reach the maximum, and the electrochemical surface area of the catalyst at 18 000 cycles is about 136 m(2) g(Pt+Pd)(-1), which is 1.3 folds than the commercial JM Pt/C (104 m(2) g(Pt)(-1)). Furthermore, there is little decrease in the electrochemical surface area for the catalyst after additional 7300 potential cycles (total 24 300 cycles). In a full cell testing, the fabricated novel electrode with extra-low Pt loading (0.043 mg cm(-2)) generated power as 1.21 kW g(Pt)(-1) when it is used as the cathode in a fuel cell.