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Carbon Nanofibers Encapsulated Nickel‐Molybdenum Nanoparticles as Hydrogen Evolution Catalysts for Aqueous Zn−CO2 System
ChemNanoMat ( IF 2.6 ) Pub Date : 2020-04-20 , DOI: 10.1002/cnma.202000099
Arunchander Asokan 1 , Chaehyun Lim 1 , Jeongwon Kim 1 , Ohhun Kwon 1 , Hansol Lee 1 , Sangwook Joo 1 , Hu Young Jeong 2 , Guntae Kim 1
Affiliation  

Carbon capture, utilization and storage techniques have been studied extensively to reduce atmospheric carbon dioxide. However, CO2 conversion technologies are not widely proposed due to sluggish conversion rate, high energy consumption and need for precious metals as catalysts. Therefore, novel metal‐CO2 electrochemical cell has been proposed to utilize CO2 to produce electricity and H2 gas continuously. Electrochemical hydrogen evolution reaction under neutral condition has demanded the overall device performance. Herein, we have developed non‐precious NiMo‐carbon nanofiber‐based catalyst with unique matchstick‐like morphology using low temperature CVD technique and demonstrated in aqueous Zn−CO2 system. The NiMo alloy offers excellent activity by promoting hydrogen adsorption/desorption and chemically bonded carbon nanofiber assists catalytic activity by providing charge transfer. Due to superior characteristics, NiMo‐carbon nanofiber exhibits significant HER activity (over‐potential of 268 mV at 10 mA cm‐2) in CO2‐saturated 1 M KOH and superior cell performance in aqueous Zn−CO2 system (peak power density of 25 mW cm−2). In addition, the stability of the catalysts has also been investigated using chronopotentiometry and the results have compared with commercial Pt/C catalysts. We are hopeful that the present study will provide insights into developing non‐precious electrocatalysts, particularly for metal‐CO2 electrochemical conversion devices.

中文翻译:

碳纳米纤维包封的镍钼纳米颗粒作为Zn-CO2水溶液制氢催化剂

碳捕获,利用和储存技术已被广泛研究以减少大气中的二氧化碳。但是,由于转化率低,能耗高以及需要贵金属作为催化剂,因此没有广泛提出CO 2转化技术。因此,提出了一种新型的金属CO 2电化学电池,该电池利用CO 2连续产生电能和H 2气体。中性条件下的电化学制氢反应要求整体器件性能。本文中,我们使用低温CVD技术开发了具有独特火柴状形态的非贵金属NiMo碳纳米纤维基催化剂,并在Zn-CO 2水溶液中进行了证明。系统。NiMo合金通过促进氢的吸附/解吸而提供出色的活性,而化学键合的碳纳米纤维通过提供电荷转移来辅助催化活性。由于具有卓越的特性,NiMo碳纳米纤维在饱和2 M的CO 2中表现出显着的HER活性(在10 mA cm -2时的过电位为268 mV ),在Zn-CO 2水溶液中(峰值功率密度)具有优异的电池性能。25 mW cm -2)。此外,还使用计时电位法研究了催化剂的稳定性,并将结果与​​市售Pt / C催化剂进行了比较。我们希望本研究能够为开发非贵重的电催化剂,特别是金属-CO 2的开发提供见解。 电化学转化装置。
更新日期:2020-04-20
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