Kubińska Laura, Szkoda Mariusz, Skorupska Malgorzata, Grabowska Patrycja, Gajewska Marta, Lukaszewicz Jerzy P, Ilnicka Anna
Faculty of Chemistry, Nicolaus Copernicus University in Torun, Gagarina 7, 87-100, Torun, Poland.
Faculty of Chemistry, Department of Chemistry and Technology of Functional Materials, Gdańsk University of Technology, Narutowicza 11/12, 80-233, Gdańsk, Poland.
Sci Rep. 2024 Nov 6;14(1):26930. doi: 10.1038/s41598-024-74031-1.
Electrocatalytic water splitting for green hydrogen production necessitates effective electrocatalysts. Currently, commercial catalysts are primarily platinum-based. Therefore, finding catalysts with comparable catalytic activity but lower cost is essential. This paper describes spinel-structured catalysts containing nickel cobaltite NiCoO, graphene, and additionally doped with heteroatoms. The structure and elemental composition of the obtained materials were analyzed by research methods such as TEM, SEM-EDX, XRD, XPS, and Raman spectroscopy. The electrochemical measurements showed that hybrid materials containing nickel cobaltite NiCoO doped with graphene are highly active catalysts in the hydrogen evolution reaction (Tafel slopes = 91 mV dec, overpotential = 468 mV and onset potential = -339 mV), while in the oxygen evolution reaction (Tafel slopes = 51 mV dec, overpotential = 1752 mV and onset potential = 370 mV), bare NiCoO without the addition of carbon has a worse activity (for HER: Tafel slopes = 120 mV dec, overpotential - does not achieve and onset potential = -404 mV, for OER: Tafel slopes = 54 mV dec, overpotential = 1796 mV and onset potential = 410 mV). In terms of stability, comparable results were obtained for each synthesized compound for both the HER and OER reactions.
用于绿色制氢的电催化水分解需要有效的电催化剂。目前，商业催化剂主要是铂基的。因此，找到具有可比催化活性但成本更低的催化剂至关重要。本文描述了含有镍钴矿NiCoO、石墨烯并额外掺杂杂原子的尖晶石结构催化剂。通过TEM、SEM-EDX、XRD、XPS和拉曼光谱等研究方法对所得材料的结构和元素组成进行了分析。电化学测量表明，含有掺杂石墨烯的镍钴矿NiCoO的混合材料在析氢反应中是高活性催化剂（塔菲尔斜率 = 91 mV dec，过电位 = 468 mV，起始电位 = -339 mV），而在析氧反应中（塔菲尔斜率 = 51 mV dec，过电位 = 1752 mV，起始电位 = 370 mV），未添加碳的裸NiCoO活性较差（对于HER：塔菲尔斜率 = 120 mV dec，过电位 - 未达到，起始电位 = -404 mV，对于OER：塔菲尔斜率 = 54 mV dec，过电位 = 1796 mV，起始电位 = 410 mV）。在稳定性方面，对于HER和OER反应，每种合成化合物都获得了可比的结果。
