In June 2020, the international authoritative journal "Advanced Functional Materials" published our school's research results on the use of cerium oxide coupled cobalt nitride porous nanosheet array electrodes for efficient electrocatalytic total water splitting "Boosting Activity on Co4N Porous Nanosheet by Coupling CeO2 for Efficient Electrochemical Overall Water Splitting at High Current Densities" and was selected as the inner cover article. This achievement was completed by Sun Hongming and others from the School of Chemistry, and Tianjin Normal University was the first author and corresponding author unit. "Advanced Functional Materials" is one of the internationally renowned academic journals in the field of materials science, with the latest impact factor of 15.621.
The electrolyzed water technology is not only an important way to produce high-purity hydrogen industrially, but also an effective way to convert intermittent energy sources (wind energy, solar energy, etc.) into hydrogen energy for storage. Generally speaking, in the process of electrolyzed water, the reaction energy barrier is large and the overpotential is high. Therefore, highly active hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) electrocatalysts are needed to accelerate the reaction. At present, high-efficiency HER and OER electrocatalysts are mainly based on Pt and Ru/Ir oxides, but the scarcity and high cost of these precious metals limit their large-scale application. Therefore, there is an urgent need to develop non-precious metal HER and OER electrocatalysts. In addition, the mismatch of reaction conditions makes it difficult to find two well-coupled electrocatalysts in a single electrolysis cell for complete water splitting. At present, it is necessary to develop an electrocatalyst that can effectively catalyze both HER and OER in the same electrolyte to avoid the cross effect of different electrocatalysts on the cathode and anode, and can further reduce the manufacturing cost of the equipment.
Based on this, super-hydrophilic Co4N-CeO2 composite nanosheet array self-supporting electrodes were prepared by anion intercalation enhanced electrodeposition and selective high temperature nitridation. The experiment combined with the DFT theoretical calculation results show that: CeO2 coupling Co4N greatly promotes the decomposition of water molecules, optimizes the adsorption of hydrogen and reduces the energy barrier of the OER intermediate reaction, and significantly improves the intrinsic catalytic activity of HER and OER. In-situ growth of super-hydrophilic Co4N-CeO2 porous nanosheet arrays on conductive substrates can accelerate the electronic conduction between the substrate and the catalyst, promote the timely release of bubbles and prevent the catalyst from falling off, thus ensuring the efficient and stable operation of the catalyst at high current density status. Therefore, the electrolytic cell assembled from the Co4N-CeO2 electrode exhibited superior catalytic activity and stability of total water splitting than the electrolytic cell assembled from the precious metal Pt/C and RuO2 electrodes.
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