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Hierarchically Organized NiCo2O4 Microflowers Anchored on Multiwalled Carbon Nanotubes: Efficient Bifunctional Electrocatalysts for Oxygen and Hydrogen Evolution Reactions
ChemPlusChem ( IF 3.4 ) Pub Date : 2019-12-22 , DOI: 10.1002/cplu.201900603 Ediga Umeshbabu 1 , P. Hari Krishna Charan 2 , Ponniah Justin 3 , G. Ranga Rao 1
ChemPlusChem ( IF 3.4 ) Pub Date : 2019-12-22 , DOI: 10.1002/cplu.201900603 Ediga Umeshbabu 1 , P. Hari Krishna Charan 2 , Ponniah Justin 3 , G. Ranga Rao 1
Affiliation
We have fabricated hierarchical flower‐like NiCo2O4 anchored on multiwalled carbon nanotubes (NiCo2O4‐MCNTs) as robust bifunctional electrocatalyst towards O2 and H2 evolution reactions in a facile surfactant free hydrothermal method. The results show that hierarchical flower‐like morphology of NiCo2O4‐MCNTs are assembled by 1D‐nanowires. The supported MCNTs are beneficial for enhanced reactive sites, efficient charge transfer and durability of the composite. The NiCo2O4‐MCNTs hybrid shows low overpotentials of 350 mV and 209 mV for OER and HER, respectively at 10 mA cm‐2. Such values are comparable to contemporary noble metal catalysts and even smaller than reported non‐precious catalysts. Moreover, this hybrid shows high current density, lower Tafel slope and excellent stability. The synergetic coupling effects between MCNTs and oxide featured with flower‐like morphology and improved microtexture properties are key factors for the superior catalytic activity of NiCo2O4‐MCNTs hybrid.
中文翻译:
固定在多壁碳纳米管上的分层组织的NiCo2O4微型花:氧气和氢气产生反应的高效双功能电催化剂
我们已经制备了固定在多壁碳纳米管(NiCo2O4-MCNTs)上的分层花状NiCo2O4,作为一种简便的无表面活性剂水热方法中的O2和H2析出反应的稳健双功能电催化剂。结果表明,NiCo2O4-MCNTs的分层花状形态是由一维纳米线组装而成的。负载的MCNT有利于增强反应性位点,有效的电荷转移和复合材料的耐久性。NiCo2O4‐MCNTs杂化物在10 mA cm‐2时分别显示出针对OER和HER的350 mV和209 mV的低过电势。该值可与当代贵金属催化剂相比,甚至小于已报道的非贵金属催化剂。此外,这种混合动力汽车具有高电流密度,较低的塔菲尔斜率和出色的稳定性。
更新日期:2019-12-23
中文翻译:
固定在多壁碳纳米管上的分层组织的NiCo2O4微型花:氧气和氢气产生反应的高效双功能电催化剂
我们已经制备了固定在多壁碳纳米管(NiCo2O4-MCNTs)上的分层花状NiCo2O4,作为一种简便的无表面活性剂水热方法中的O2和H2析出反应的稳健双功能电催化剂。结果表明,NiCo2O4-MCNTs的分层花状形态是由一维纳米线组装而成的。负载的MCNT有利于增强反应性位点,有效的电荷转移和复合材料的耐久性。NiCo2O4‐MCNTs杂化物在10 mA cm‐2时分别显示出针对OER和HER的350 mV和209 mV的低过电势。该值可与当代贵金属催化剂相比,甚至小于已报道的非贵金属催化剂。此外,这种混合动力汽车具有高电流密度,较低的塔菲尔斜率和出色的稳定性。