Shewanella oneidensis Assisted Biosynthesis of Pd/Reductive‐Graphene‐Oxide Nanocomposites for Oxygen Reduction Reaction,ChemistrySelect

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Shewanella oneidensis Assisted Biosynthesis of Pd/Reductive‐Graphene‐Oxide Nanocomposites for Oxygen Reduction Reaction
ChemistrySelect ( IF 1.9 ) Pub Date : 2020-03-17 , DOI: 10.1002/slct.202000530
Wei Wang _{1,

2} , Jian‐Li Mi ₁ , Qian‐Cen Shen ₁ , Yang‐Chun Yong ₂

Affiliation

Biological synthesis of green nanomaterials holds great promise for sustainable catalysis with versatile applications. Herein, Shewanella oneidensis MR‐1 is used to develop a green method to synthesize Pd/reductive graphene oxide (rGO) nanocomposites without the addition of toxic reducing agents. It was found that S. oneidensis MR‐1 cells could efficiently reduce graphene oxide to rGO and synthesize Pd nanoparticles that uniformly dispersed on the rGO nanosheets. More strikingly, the addition of GO greatly increases the recovery rate of Pd from 37.8 % to 90.4 %. After carbonization, the biosynthesized Pd/rGO nanocomposites exhibits promising catalytic activities toward oxygen reduction reaction with an onset potential of 0.92 V, a half‐wave potential of 0.81 V, and a limiting current density of 5.2 mA cm⁻² in 0.1 M KOH electrolyte. This work provides a simple, “green”, and cost‐effective method for the preparation of graphene supported nanocomposites with extended applications.

中文翻译：

希瓦氏菌辅助的Pd /还原石墨烯氧化物纳米复合材料的生物合成用于氧还原反应

绿色纳米材料的生物合成具有广泛应用前景，有望实现可持续催化。在此，无花果希瓦氏菌MR-1用于开发一种绿色方法，无需添加毒性还原剂即可合成Pd /还原性氧化石墨烯（rGO）纳米复合材料。发现沙门氏菌MR-1细胞可以有效地将氧化石墨烯还原为rGO，并合成均匀分散在rGO纳米片上的Pd纳米颗粒。更为显着的是，GO的添加将Pd的回收率从37.8％提高到90.4％。碳化后，生物合成的Pd / rGO纳米复合材料在0.1 M KOH电解质中具有0.92 V的起始电势，0.81 V的半波电势和5.2 mA cm ^-2的极限电流密度，对氧还原反应具有良好的催化活性。。这项工作为制备石墨烯负载的纳米复合材料提供了一种简单，“绿色”且具有成本效益的方法，具有扩展的应用范围。

更新日期：2020-03-19

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