Solvent dispersion triggered the formation of NiFe-gel as an efficient electrocatalyst for enhancing the oxygen evolution reaction

2020 ◽  
Vol 56 (56) ◽  
pp. 7781-7784
Author(s):  
Hongkai Wang ◽  
Weihuang Zhu ◽  
Qi Xue ◽  
Changhao Wang ◽  
Kaiqiang Liu
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Oxygen Evolution ◽  
Specific Surface Area ◽  
Oxygen Evolution Reaction ◽  
Alkaline Electrolyte

The solvent dispersion triggered gelation for a Ni2.0Fe-gel catalyst has a specific surface area of 216.9 m2 g−1, and its overpotential in an alkaline electrolyte can reach a lower value with 245 mV at 10 mA cm−2 than commercial metal RuO2.

Nanoporous IrO2 catalyst with enhanced activity and durability for water oxidation owing to its micro/mesoporous structure

Nanoscale ◽  
2017 ◽  
Vol 9 (27) ◽  
pp. 9291-9298 ◽  
Author(s):  
Guoqiang Li ◽  
Songtao Li ◽  
Meiling Xiao ◽  
Junjie Ge ◽  
Changpeng Liu ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Oxygen Evolution ◽  
Specific Surface Area ◽  
Oxygen Evolution Reaction ◽  
Water Oxidation ◽  
Mesoporous Structure ◽  
Electrocatalytic Performance ◽  
Enhanced Activity ◽  
Iro2 Catalyst

Micro/mesoporous IrO2 catalyst with an ultrahigh specific surface area of 363.3 m2 g−1 shows excellent electrocatalytic performance for the oxygen evolution reaction.

Composite NiCoO2/NiCo2O4 inverse opals for the oxygen evolution reaction in an alkaline electrolyte

2020 ◽  
Vol 10 (22) ◽  
pp. 7566-7580
Author(s):  
Pei-Sung Hung ◽  
Wei-An Chung ◽  
Shih-Cheng Chou ◽  
Kuang-Chih Tso ◽  
Chung-Kai Chang ◽  
...  
Keyword(s):  
Mass Transport ◽  
Surface Area ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Alkaline Electrolyte ◽  
Functional Coating ◽  
Inverse Opals ◽  
Ordered Macroporous

The inverse opals exhibit a 3D ordered macroporous framework, which provides an excessive surface area and facile mass transport. A conformal NiCoOx functional coating further renders these materials with increased reactivity in OER catalysis.

scholarly journals Hexadecyltrimethylammonium hydroxide promotes electrocatalytic activity for the oxygen evolution reaction

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Yugan Gao ◽  
Chengqi Wu ◽  
Sen Yang ◽  
Yiwei Tan
Keyword(s):  
Surface Area ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Active Surface ◽  
Ammonia Borane ◽  
Absolute Number ◽  
Alkaline Electrolyte ◽  
Active Surface Area ◽  
Electrochemically Active ◽  
Electrochemically Active Surface

Abstract The oxygen evolution reaction is an essential factor in many renewable energy technologies, such as water splitting, fuel cells, and metal–air batteries. Here we show a unique solution to improve the oxygen evolution reaction rate by adjusting the electrolyte composition via the introduction of hexadecyltrimethylammonium hydroxide into an alkaline electrolyte. The strong adsorption of hexadecyltrimethylammonium cations on the surface of electrocatalysts provides the increased absolute number of OH− ions near the electrocatalyst surface, which effectively promotes the oxygen evolution reaction performance of electrocatalysts, such as Fe1−yNiyS2@Fe1−xNixOOH microplatelets and SrBaNi2Fe12O22 powders. Meanwhile, we present an electrochemical conditioning approach to engineering the electrochemically active surface area of electrocatalysts, by which the resultant Fe1−yNiyS2@Fe1−xNixOOH microplatelets have a larger electrochemically active surface area after the electrochemical conditioning of the as-synthesized Fe1−yNiyS2 microplatelets using ammonia borane than those obtained after the conventional electrochemical conditioning without ammonia borane, presumably due to the appropriate conversion rate of Fe1−xNixOOH shells.

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