High‐Performance Electrocatalysts for Hydrogen Evolution Reaction Using Flexible Electrodes Made up of Chemically Modified Polyester Films,ChemistrySelect

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High‐Performance Electrocatalysts for Hydrogen Evolution Reaction Using Flexible Electrodes Made up of Chemically Modified Polyester Films
ChemistrySelect ( IF 1.9 ) Pub Date : 2018-03-12 , DOI: 10.1002/slct.201701446
Raju Thota _{1,

2} , Venkatachalam Ganesh _{1,

2}

Affiliation

In this work we propose a simple methodology to fabricate monometallic nickel [Ni] and bimetallic silver‐nickel [Ag/Ni] deposited flexible, self‐supported electrodes using polyester (commonly used as overhead projector [OHP]) films. Monometallic Ni is deposited onto chemically modified OHP sheets using a simple electroless deposition process. Similarly bimetallic Ag/Ni coating is carried out by employing galvanic replacement reaction (GRR) of silver onto Ni coated polyester films. Structure, morphology, composition and crystalline phase characteristics of these monometallic and bimetallic deposited flexible electrodes are analyzed by using a variety of spectroscopic and microscopic techniques. Electrochemical characteristics corresponding to hydrogen evolution reaction (HER) are investigated by using linear sweep voltammetry (LSV), Tafel polarization and impedance spectroscopic studies. Effect of time duration associated with GRR on the structural morphology of resultant deposits and on their HER electrocatalytic activity is also investigated. These studies reveal that compared to monometallic Ni, bimetallic Ag/Ni deposited flexible electrodes exhibit enhanced electrocatalytic performance for HER due to strong synergistic effect of bimetallic heterostructures. Among the various electrodes investigated, bimetallic Ag/Ni coated flexible polyester films obtained through 5 minutes of GRR show a higher electrocatalytic activity for HER. These results provide a platform towards the development of alternative electrodes for HER using simple and affordable techniques that play a significant role for further advancement of alkaline water electrolysis.

中文翻译：

使用化学修饰的聚酯薄膜制成的柔性电极进行氢气发生反应的高性能电催化剂

在这项工作中，我们提出了一种简单的方法来制造使用聚酯（通常用作投影仪[OHP]）薄膜的单金属镍[Ni]和双金属银镍[Ag / Ni]沉积的自支撑柔性电极。使用简单的化学沉积工艺将单金属Ni沉积到化学改性的OHP板上。类似地，通过在银涂覆的聚酯膜上采用银的电置换反应（GRR）来进行双金属Ag / Ni涂覆。这些单金属和双金属沉积的柔性电极的结构，形态，组成和晶相特性通过使用各种光谱和显微镜技术进行了分析。通过使用线性扫描伏安法（LSV）研究了与氢释放反应（HER）相对应的电化学特性，Tafel极化和阻抗光谱研究。还研究了与GRR相关的持续时间对所得沉积物的结构形态及其HER电催化活性的影响。这些研究表明，与单金属Ni相比，双金属Ag / Ni沉积的柔性电极由于双金属异质结构的强协同作用而显示出增强的HER电催化性能。在研究的各种电极中，通过5分钟的GRR获得的双金属Ag / Ni涂层柔性聚酯薄膜对HER表现出更高的电催化活性。这些结果为使用简单且价格合理的技术开发用于HER的替代电极提供了平台，该技术在碱性水电解的进一步发展中起着重要作用。

更新日期：2018-03-12

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