Polyethylenimine‐assisted Synthesis of Au Nanoparticles for Efficient Syngas Production,Electroanalysis

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Polyethylenimine‐assisted Synthesis of Au Nanoparticles for Efficient Syngas Production
Electroanalysis ( IF 2.7 ) Pub Date : 2019-04-25 , DOI: 10.1002/elan.201800782
Young‐Hoon Chung ₁ , Min Gwan Ha _{1,

2} , Youngseung Na ₃ , Hee‐Young Park ₁ , Hyoung‐Juhn Kim _{1,

4} , Dirk Henkensmeier _{1,

4,

5} , Sung Jong Yoo _{1,

4} , Jin Young Kim _{1,

4,

5} , So Young Lee ₁ , Seung Woo Lee ₆ , Hyun S. Park _{1,

4} , Yong‐Tae Kim ₂ , Jong Hyun Jang _{1,

4,

5}

Affiliation

The ability to capture, store, and use CO₂ is important for remediating greenhouse‐gas emissions and combatting global warming. Herein, Au nanoparticles (Au‐NPs) are synthesized for effective electrochemical CO₂ reduction and syngas production, using polyethylenimine (PEI) as a ligand molecule. The PEI‐assisted synthesis provides uniformly sized 3‐nm Au NPs, whereas larger irregularly shaped NPs are formed in the absence of PEI in the synthesis solution. The Au‐NPs synthesized with PEI (PEI−Au/C, average PEI Mw=2000) exhibit improved CO₂ reduction activities compared to Au‐NPs formed in the absence of PEI (bare Au NPs/C). PEI−Au/C displays a 34 % higher activity toward CO₂ reduction than bare Au NPs/C; for example, PEI−Au/C exhibits a CO partial current density (j_CO) of 28.6 mA cm⁻² at −1.13 V_RHE, while the value for bare Au NPs/C is 21.7 mA cm⁻²; the enhanced j_CO is mainly due to the larger surface area of PEI−Au/C. Furthermore, the PEI−Au/C electrode exhibits stable performance over 64 h, with an hourly current degradation rate of 0.25 %. The developed PEI−Au/C is employed in a CO₂‐reduction device coupled with an IrO₂ water‐oxidation catalyst and a proton‐conducting perfluorinated membrane to form a PEI−Au/C|Nafion|IrO₂ membrane‐electrode assembly. The device using PEI−Au/C as the CO₂‐reduction catalyst exhibits a j_CO of 4.47 mA/cm² at 2.0 V_cell. Importantly, the resulted PEI−Au/C is appropriate for efficient syngas production with a CO ratio of around 30–50 %.

中文翻译：

聚乙烯亚胺辅助合成Au纳米颗粒以有效生产合成气

捕获，储存和使用CO ₂的能力对于补救温室气体排放和应对全球变暖至关重要。本文中，使用聚乙烯亚胺（PEI）作为配体分子合成了Au纳米颗粒（Au-NPs），以有效地电化学还原CO ₂和生产合成气。由PEI辅助的合成可提供大小均一的3 nm Au NP，而在合成溶液中不存在PEI的情况下会形成较大的不规则形状的NP。与不使用PEI形成的Au-NPs（裸Au NPs / C）相比，用PEI合成的Au-NPs（PEI-Au / C，平均PEI Mw = 2000）显示出改善的CO ₂还原活性。PEI-Au / C对CO _2的活性高34％比裸金纳米颗粒/碳还原; 例如，PEI-Au / C在-1.13 V _RHE时表现出28.6 mA cm ^-2的CO分电流密度（j _CO），而裸金NPs / C的值为21.7 mA cm ^-2；j _CO的提高主要是由于PEI-Au / C的表面积较大。此外，PEI-Au / C电极在64小时内表现出稳定的性能，每小时电流衰减率为0.25％。研发的PEI-Au / C用于CO ₂还原装置，并与IrO ₂水氧化催化剂和质子传导性全氟化膜耦合，形成PEI-Au / C | Nafion | IrO ₂膜电极组件。使用PEI-Au / C作为CO的设备₂还原催化剂在2.0 V_电池下的aj _CO为4.47 mA / cm ²。重要的是，所得的PEI-Au / C适用于CO比率约为30–50％的高效合成气生产。

更新日期：2019-04-25

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