Electrocatalytic Ammonia Oxidation to Nitrite and Nitrate with NiOOH‐Ni
Source abstract
Abstract
Abstract Ammonia electrooxidation in aqueous solutions can be a highly energy‐efficient process in producing nitrate and nitrite while generating hydrogen under ambient conditions. However, the kinetics of this reaction are slow and the role of catalyst in facilitating ammonia electrooxidation is not well understood. In this study, a high‐performance NiOOH‐Ni catalyst is introduced for converting ammonia into nitrite with Faraday efficiency of up to 90.4% and nitrate production rate of 1 mg h−1 cm−2. By employing Operando techniques, the role of NiOOH catalyst is elucidated in the dynamic electrooxidation of ammonia. Density functional theory (DFT) calculations support experimental observations and reveal the mechanism of the electrochemical oxidation of ammonia to nitrite and nitrate. Overall, this research contributes to the development of a cost‐effective and highly efficient catalyst for large‐scale ammonia electrolysis, while shedding light on the underlying mechanism of the NiOOH catalyst in ammonia electrooxidation.
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Research context
OpenAlex topics: Ammonia Synthesis and Nitrogen Reduction · Advanced Photocatalysis Techniques · Electrocatalysts for Energy Conversion
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Civil and Environmental Engineering University of Technology Sydney Sydney NSW 2007 Australia
WA School of Mines: Minerals Energy and Chemical Engineering (WASM‐MECE) Curtin University Perth WA 6102 Australia
Department of Physics Tamkang University Tamsui 25137 Taiwan
Department of Chemistry Faculty of Science Hokkaido University Sapporo 060‐0810 Japan
Research Center for Energy and Environmental Materials (GREEN) National Institute for Materials Science Namiki 1‐1 Tsukuba 305‐0044 Japan
Institute for Chemical Reaction Design and Discovery (WPI‐ICReDD) Hokkaido University Sapporo 001‐0021 Japan
ARC Centre of Excellence for Electromaterials Science Intelligent Polymer Research Institute AIIM Facility Innovation Campus University of Wollongong Wollongong NSW 2500 Australia
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