Bifunctional catalytic activity of Ni–Co layered double hydroxide for the electro-oxidation of water and methanol,Sustainable Energy & Fuels

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Bifunctional catalytic activity of Ni–Co layered double hydroxide for the electro-oxidation of water and methanol
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2020-08-15 , DOI: 10.1039/d0se00899k
Komal Patil _{1,

2,

3,

4,

5} , Pravin Babar _{1,

2,

3,

4,

5} , Dong Min Lee _{1,

2,

3,

4,

5} , Vijay Karade _{1,

2,

3,

4,

5} , Eunae Jo _{1,

2,

3,

4,

5} , Sumit Korade _{1,

2,

3,

4,

5} , Jin Hyeok Kim _{1,

2,

3,

4,

5}

Affiliation

The development of nanostructured architectures using low-cost first–row transition metals with high electrocatalytic activity to replace noble-metal-based electrocatalysts has recently gained considerable attention in the field of clean and sustainable energy generation technology. In this study, highly efficient, binder-free, Ni–Co layered double hydroxide (NiCo-LDH) nanowires on a nickel foam (NF) substrate were fabricated via a simple, one-step hydrothermal synthesis procedure, and their use as electrocatalysts for the oxygen evolution reaction (OER) and methanol oxidation reaction (MOR) was studied. When NiCo-LDH was used as the OER electrocatalyst, the overpotential required to deliver a current density of 20 and 100 mA cm⁻², was only 270 and 410 mV (without iR correction), and it exhibited a long-term stability of 50 h in 1 M KOH. Moreover, the as-prepared NiCo-LDH nanowire electrocatalyst presented remarkable electrochemical performance for the MOR with a higher current density of 761 mA cm⁻² at 0.7 V vs. the saturated calomel electrode (SCE) and excellent stability in 1 M KOH with 0.5 M methanol. The vertically aligned NiCo-LDH nanowires presented numerous active sites and open structures and their synergism with the highly conductive NF substrate was responsible for the excellent electrochemical performance of the electrocatalyst.

中文翻译：

Ni-Co层状双氢氧化物对水和甲醇电氧化的双功能催化活性

使用低成本的具有高电催化活性的第一行过渡金属来替代基于贵金属的电催化剂的纳米结构的开发最近在清洁和可持续的能源生产技术领域受到了广泛关注。在这项研究中，通过简单的一步式水热合成程序，在镍泡沫（NF）基材上制备了高效，无粘合剂的Ni-Co层状双氢氧化物（NiCo-LDH）纳米线，并将其用作电催化剂用于研究了析氧反应（OER）和甲醇氧化反应（MOR）。当NiCo-LDH用作OER电催化剂时，提供20和100 mA cm ^-2的电流密度所需的过电势，仅270和410 mV（无iR校正），并且在1 M KOH中表现出50 h的长期稳定性。此外，所制备的NiCo-LDH纳米线电催化剂对MOR表现出卓越的电化学性能，在0.7 V时的电流密度相对于饱和甘汞电极（SCE）更高，为761 mA cm ^-2，并且在0.5 M的1 M KOH中具有出色的稳定性。 M甲醇。垂直排列的NiCo-LDH纳米线呈现出许多活性位点和开放结构，它们与高导电NF底物的协同作用使电催化剂具有出色的电化学性能。

更新日期：2020-09-29

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