Publication date: 21st July 2025
Developing efficient and selective electrocatalysts for the CO₂ reduction reaction (CO₂RR) remains a key challenge for sustainable carbon utilization. In this work, we report the synthesis of Ni-doped nitrogen-rich porous carbon materials and investigate the impact of synthesis conditions on their structural properties and electrocatalytic performance towards CO₂RR. By tuning parameters, we achieved materials with tailored porosity, nitrogen content, and well-dispersed Ni active sites.
Electrochemical evaluation was carried out in both acidic and alkaline electrolytes. The optimized Ni–N–C catalyst showed high selectivity towards CO production, with Faradaic efficiencies exceeding 95% over a wide potential range in alkaline media, and even under acidic conditions Fig.1. The combination of nitrogen coordination and Ni was found to play a crucial role in suppressing the competing hydrogen evolution reaction (HER), especially under acidic conditions where HER usually dominates [1,2].
These findings highlight the importance of precise control over synthesis parameters in designing Ni–N–C catalysts with dual electrolyte applicability for selective CO₂ electroreduction. This work provides new insights into the design of pH-universal catalysts for practical CO₂ conversion technologies.
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