Cu2O/Cu Foam Cathode for Nitrate Reduction
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Solution Overview
Problem
Current methods for hydrogen storage and nitrate pollution treatment are inefficient and environmentally unfriendly, with high energy consumption and low selectivity in ammonia production.
Innovation Solution
A three-dimensional structured electric cathode based on cuprous oxide is developed through a specific preparation method, including cutting copper foam, ultrasonic treatment, and electrodeposition, to enhance electrocatalytic reduction of nitrate to ammonia.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional Haber-Bosch process is used for ammonia synthesis, then ammonia production is achieved, but energy consumption is high and energy efficiency is low
Solution Approach 1:
The patent changes the fundamental parameters of ammonia synthesis by switching from thermal catalysis (Haber-Bosch) to electrocatalytic reduction. This involves changing the reaction conditions from high temperature and pressure to ambient conditions with electrical energy input, thereby reducing energy consumption while maintaining productivity
Solution Approach 2:
The patent replaces the mechanical/thermal system of Haber-Bosch process with an electrochemical system. Instead of using mechanical compression and thermal energy, the invention uses electrical energy to drive the nitrate reduction reaction, achieving ammonia production with lower energy consumption
2Reliability
If expensive metal electrodes are used for electrocatalytic nitrate reduction, then catalytic activity is achieved, but selectivity and yield of ammonia are relatively low
Solution Approach 1:
The patent uses composite materials strategy by combining copper foam substrate with cuprous oxide catalyst layers. This composite structure leverages the high surface area and conductivity of copper foam with the excellent catalytic properties of cuprous oxide, achieving both high catalytic activity and high ammonia selectivity
Solution Approach 2:
The patent applies local quality by creating a three-dimensional structured cuprous oxide catalyst with specific crystal facets exposed on the copper foam surface. This localized structural optimization enhances the catalytic activity at specific active sites while maintaining high selectivity for ammonia production
3Quantity of substance
If traditional nitrate treatment processes are used, then nitrate removal is achieved, but secondary pollution is generated and reaction duration is long
Solution Approach 1:
The patent converts the harmful nitrate pollutant into beneficial ammonia product through electrocatalytic reduction. Instead of merely removing nitrate and generating secondary pollution, the process transforms nitrate into a useful chemical product, eliminating pollution while creating value
Solution Approach 2:
The patent uses cuprous oxide as an intermediary catalyst that facilitates the direct conversion of nitrate to ammonia. This intermediary enables a clean one-step reduction process that avoids intermediate pollutants and secondary contamination issues associated with traditional treatment methods
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The Cu2O/Cu CF electric cathode achieves high Faraday efficiency (up to 85%), selectivity (up to 99%), and nitrate removal rate (up to 100%), with low energy consumption and good reusability, making the process economically and environmentally friendly.
Implementation Method 1
cutting copper foam (CF), sequentially subjecting to ultrasonic treatment with acetone, hydrochloric acid, anhydrous ethanol and deionized water
Implementation Method 2
placing the copper foam in the electrodeposition precursor solution, electrodepositing at a predetermined temperature by using a three-electrode system and a potentiostatic method
Data Source
AI summary
A preparation method and an application of a three-dimensional structured electric cathode based on cuprous oxide are provided by the present application. The preparation method includes the following steps: cutting copper foam, sequentially subjecting to ultrasonic treatment with acetone, hydrochloric acid, anhydrous ethanol and deionized water, followed by washing and vacuum drying to serve as an electrode substrate for later use; dissolving sodium acetate and copper acetate in deionized water, fully stirring for completely dissolution to obtain a solution, and adjusting a pH value of the solution to be acidic to serve as an electrodeposition precursor solution; and placing the copper foam in the electrodeposition precursor solution, electrodepositing at a predetermined temperature by using a three-electrode system and a potentiostatic method, followed by taking out, washing, and drying to obtain a catalytic electrode. The electric cathode is applied in fields of electrocatalytic reduction of nitrate and electrocatalytic ammonia production.