Discontinuously covered IrO2–RuO2@Ru electrocatalysts for the oxygen evolution reaction: how high activity and long-term durability can be simultaneously realized in the synergistic and hybrid nano-structure

2017 ◽  
Vol 5 (33) ◽  
pp. 17221-17229 ◽  
Author(s):  
Guoqiang Li ◽  
Songtao Li ◽  
Junjie Ge ◽  
Changpeng Liu ◽  
Wei Xing
Keyword(s):  
High Activity ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Intrinsic Activity ◽  
Nano Structure

A supported IrO2–RuO2@Ru (3 : 1) catalyst exhibits an IrO2-enriched surface and the intrinsic activity is enhanced obviously compared to that of an alloyed Ir3RuO2 catalyst.

Iron tungsten mixed composite as a robust oxygen evolution electrocatalyst

2019 ◽  
Vol 55 (73) ◽  
pp. 10944-10947 ◽  
Author(s):  
Chizhong Wang ◽  
Rong Wang ◽  
Yue Peng ◽  
Jianjun Chen ◽  
Junhua Li
Keyword(s):  
High Activity ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Term Stability ◽  
Long Term Stability

An iron tungsten mixed composite exhibited a high activity and a long-term stability for oxygen evolution reaction electrocatalysis.

scholarly journals Robust Carbon-Stabilization of Few-Layer Black Phosphorus for Superior Oxygen Evolution Reaction

Coatings ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 695 ◽  
Author(s):  
Mengjie Zhang ◽  
Wenchang Zhu ◽  
Xingzhe Yang ◽  
Meng Feng ◽  
Hongbin Feng
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Black Phosphorus ◽  
Carbon Stabilization ◽  
High Durability ◽  
Carbon Coated ◽  
Alkaline Conditions ◽  
Doped Graphene ◽  
A Current

Few-layer exfoliated black phosphorus (Ex-BP) has attracted tremendous attention owing to its promising applications, including in electrocatalysis. However, it remains a challenge to directly use few-layer Ex-BP as oxygen-involved electrocatalyst because it is quite difficult to restrain structural degradation caused by spontaneous oxidation and keep it stable. Here, a robust carbon-stabilization strategy has been implemented to prepare carbon-coated Ex-BP/N-doped graphene nanosheet (Ex-BP/NGS@C) nanostructures at room temperature, which exhibit superior oxygen evolution reaction (OER) activity under alkaline conditions. Specifically, the as-synthesized Ex-BP/NGS@C hybrid presents a low overpotential of 257 mV at a current density of 10 mA cm−2 with a small Tafel slope of 52 mV dec−1 and shows high durability after long-term testing.

scholarly journals Effects of Annealing Temperature on the Oxygen Evolution Reaction Activity of Copper–Cobalt Oxide Nanosheets

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 657
Author(s):  
Geul Han Kim ◽  
Yoo Sei Park ◽  
Juchan Yang ◽  
Myeong Je Jang ◽  
Jaehoon Jeong ◽  
...  
Keyword(s):  
High Activity ◽  
Cobalt Oxide ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Low Cost ◽  
High Surface ◽  
High Surface Area ◽  
Cobalt Hydroxide ◽  
Ni Foam ◽  
Electron Conduction

Developing high performance, highly stable, and low-cost electrodes for the oxygen evolution reaction (OER) is challenging in water electrolysis technology. However, Ir- and Ru-based OER catalysts with high OER efficiency are difficult to commercialize as precious metal-based catalysts. Therefore, the study of OER catalysts, which are replaced by non-precious metals and have high activity and stability, are necessary. In this study, a copper–cobalt oxide nanosheet (CCO) electrode was synthesized by the electrodeposition of copper–cobalt hydroxide (CCOH) on Ni foam followed by annealing. The CCOH was annealed at various temperatures, and the structure changed to that of CCO at temperatures above 250 °C. In addition, it was observed that the nanosheets agglomerated when annealed at 300 °C. The CCO electrode annealed at 250 °C had a high surface area and efficient electron conduction pathways as a result of the direct growth on the Ni foam. Thus, the prepared CCO electrode exhibited enhanced OER activity (1.6 V at 261 mA/cm2) compared to those of CCOH (1.6 V at 144 mA/cm2), Co3O4 (1.6 V at 39 mA/cm2), and commercial IrO2 (1.6 V at 14 mA/cm2) electrodes. The optimized catalyst also showed high activity and stability under high pH conditions, demonstrating its potential as a low cost, highly efficient OER electrode material.

scholarly journals Intrinsic activity modulation and structural design of NiFe alloy catalysts for an efficient oxygen evolution reaction

2021 ◽  
Author(s):  
Qiaoling Kang ◽  
Dawei Lai ◽  
Wenyin Tang ◽  
Qingyi Lu ◽  
Feng Gao
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Structural Design ◽  
Active Sites ◽  
Intrinsic Activity ◽  
Effective Strategies ◽  
Alloy Catalysts

Effective strategies to increase the intrinsic activity by electronic modulation and to increase the number of active sites by structural design are discussed for improving the oxygen evolution activities of NiFe alloys.

CoC2O4·2H2O derived Co3O4 nanorods array: a high-efficiency 1D electrocatalyst for alkaline oxygen evolution reaction

2018 ◽  
Vol 54 (12) ◽  
pp. 1533-1536 ◽  
Author(s):  
Yicheng Wei ◽  
Xiang Ren ◽  
Hongmin Ma ◽  
Xu Sun ◽  
Yong Zhang ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
High Efficiency ◽  
Turnover Frequency ◽  
High Turnover ◽  
Nanorods Array ◽  
Co3o4 Nanorods ◽  
Catalyst Electrode

Self-standing Co3O4 nanorods array on Co foil as a 1D OER catalyst electrode, only needs overpotential of 308 mV to drive 15 mA cm−2 in 1.0 M KOH, with good long-term electrochemical durability and a high turnover frequency.

High topological tri-metal phosphide of CoP@FeNiP toward enhanced activities in oxygen evolution reaction

Nanoscale ◽  
2021 ◽  
Author(s):  
Jianzhi Wang ◽  
Chen Chen ◽  
Ning Cai ◽  
Miao Wang ◽  
Hui Li ◽  
...  
Keyword(s):  
High Activity ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Precious Metal ◽  
Low Cost ◽  
Metal Phosphide

The development of non-precious metal electrocatalysts with high activity, good durability and low cost to replace precious metal electrocatalysts is highly demanded for oxygen evolution reaction (OER).

Self-supported Co-doped FeNi carbonate hydroxide nanosheet array as a highly efficient electrocatalyst towards the oxygen evolution reaction in an alkaline solution

Nanoscale ◽  
2019 ◽  
Vol 11 (22) ◽  
pp. 10595-10602 ◽  
Author(s):  
Yu-Feng Qi ◽  
Qian Wang ◽  
Xiu-Guang Wang ◽  
Zheng-Yu Liu ◽  
Xiao-Jun Zhao ◽  
...  
Keyword(s):  
High Activity ◽  
Oxygen Evolution ◽  
Alkaline Solution ◽  
Oxygen Evolution Reaction ◽  
Nickel Foam ◽  
Highly Efficient ◽  
Nanosheet Array ◽  
Carbonate Hydroxide ◽  
Co Doped ◽  
Excellent Stability

A Co-doped FeNi carbonate hydroxide nanosheet array supported on nickel foam served as an efficient oxygen evolution electrocatalyst with a high activity and excellent stability.

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