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首页> 外文期刊>Chemistry: A European journal >Well-dispersed Pt cubes on porous Cu foam: High-performance catalysts for the electrochemical oxidation of glucose in neutral media
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Well-dispersed Pt cubes on porous Cu foam: High-performance catalysts for the electrochemical oxidation of glucose in neutral media

机译：多孔Cu泡沫上分散良好的Pt立方体：用于中性介质中葡萄糖电化学氧化的高性能催化剂

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The investigation of highly efficient catalysts for the electrochemical oxidation of glucose is the most critical challenge to commercialize nonenzymatic glucose sensors, which display a few attractive superiorities including the sufficient stability of their properties and the desired reproducibility of results over enzyme electrodes. Herein we propose a new and very promising catalyst: Pt cubes well-dispersed on the porous Cu foam, for the the electrochemical oxidation reaction of glucose in neutral media. The catalyst is fabricated in situ on a homemade screen-printed carbon electrode (SPCE) substrate through initially synthesizing the three-dimensional (3D) porous Cu foam using a hydrogen evolution assisted electrodeposition strategy, followed by electrochemically reducing the platinic precursor simply and conveniently. Field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) proofs demonstrate that Pt cubes, with an average size (the distance of opposite faces) of 185.1 nm, highly dispersed on the macroanopore integrated Cu foam support can be reproducibly obtained. The results of electrochemical tests indicate that the cubic Pt-based catalyst exhibits significant enhancement on the catalytic activity towards the electrooxidation of glucose in the presence of chloride ions, providing a specific activity 6.7 times and a mass activity 5.3 times those of commercial Pt/C catalysts at -0.4 V (vs. Ag/AgCl). In addition, the proposed catalyst shows excellent stability of performance, with only a 2.8 % loss of electrocatalytic activity after 100 repetitive measurements. Highly dispersed Pt cubes on a 3D porous Cu foam (see figure) were reproducibly obtained using a very facile but very effective two-step electrodeposition method. The synthesized cubic Pt supported on the Cu foam exhibited excellent catalytic activity for the electrooxidation of glucose in the presence of chloride ions, and kept splendid stability of electrocatalytic performance in neutral media.
机译：对用于葡萄糖的电化学氧化的高效催化剂的研究是使非酶葡萄糖传感器商业化的最关键挑战，非酶葡萄糖传感器显示出一些吸引人的优点，包括其性能的足够稳定性和与酶电极相比所需的结果可重复性。本文中，我们提出了一种新型且非常有前景的催化剂：Pt立方体充分分散在多孔Cu泡沫上，用于葡萄糖在中性介质中的电化学氧化反应。通过使用氢逸出辅助电沉积策略首先合成三维（3D）多孔Cu泡沫，然后简单，方便地电化学还原铂类前体，在自制的丝网印刷碳电极（SPCE）基材上原位制备催化剂。场发射扫描电子显微镜（FESEM）和透射电子显微镜（TEM）证明表明，可重现分散在宏观/纳米孔集成Cu泡沫支撑体上的平均尺寸（相对面的距离）为185.1 nm的Pt立方体获得。电化学测试结果表明，在存在氯离子的情况下，立方Pt基催化剂对葡萄糖的电氧化催化活性显着增强，比活性为市售Pt / C的6.7倍，质量活性为5.3倍。 -0.4 V（vs. Ag / AgCl）催化剂。另外，所提出的催化剂表现出优异的性能稳定性，在进行100次重复测量后，电催化活性仅损失2.8％。使用非常简便但非常有效的两步电沉积方法，可重现地获得3D多孔Cu泡沫上高度分散的Pt立方体（见图）。负载在铜泡沫上的合成立方铂在氯离子存在下对葡萄糖的电氧化表现出优异的催化活性，在中性介质中保持了出色的电催化性能稳定性。

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