Nanoconfined Synthesis of Nitrogen-Rich Metal-Free Mesoporous Carbon Nitride Electrocatalyst for the Oxygen Evolution Reaction,ACS Applied Energy Materials

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Nanoconfined Synthesis of Nitrogen-Rich Metal-Free Mesoporous Carbon Nitride Electrocatalyst for the Oxygen Evolution Reaction
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-01-09 00:00:00 , DOI: 10.1021/acsaem.9b01876
Md. A. Wahab _{1,

2,

3,

4} , Jickson Joseph _{1,

5} , Luqman Atanda _{1,

2} , Ummul K. Sultana ₁ , Jorge N. Beltramini _{1,

2} , Kostya Ostrikov _{1,

5} , Geoffrey Will ₁ , Anthony P. O’Mullane ₁ , Ahmed Abdala ₃

Affiliation

Synthesizing metal-free, low-cost, and durable electrocatalysts that are active for the oxygen evolution reaction (OER) is essential for the development of commercial alkaline water electrolyzers. Herein, we develop a nanoconfined synthesis approach for the fabrication of a metal-free graphitic mesoporous carbon nitride (gMesoCN) electrocatalyst with a high surface area of 406 m²/g and high nitrogen content of 48%. This is achieved by a nanohard-templating approach through simple polymerization of guanidine hydrochloride (GndCl) as a single carbon–nitrogen source inside the organized mesopore channels of a mesoporous SBA15 silica nanotemplate. The produced material is characterized with X-ray diffraction (XRD) and transmission electron microscopy (TEM), which confirmed the formation of a well-ordered mesoporous carbon nitride, while analysis of the pore size distribution indicated the formation of uniformly sized pore channels of 4.56 nm. X-ray photoelectron spectroscopy (XPS) indicated that gMesoCN consisted of C and N. The metal-free gMesoCN material showed good electrocatalytic performance for the OER in alkaline medium, where a Tafel slope of 52.4 mV/dec indicated favorable OER kinetics. Significantly, the gMesoCN material demonstrates long-term durability with 98.4% retention of current density after 24 h. The reported gMesoCN material is inexpensive, environmentally friendly, and easy-to-synthesize with the potential for applicability in the field of electrocatalysis.

中文翻译：

纳米限制合成的富氮无金属介孔氮化碳电催化剂用于析氧反应

合成对氧气析出反应（OER）具有活性的无金属，低成本且耐用的电催化剂对于开发商业碱性水电解槽至关重要。本文中，我们开发了一种纳米受限的合成方法，用于制备高表面积为406 m ²的无金属石墨中孔氮化碳（gMesoCN）电催化剂。/ g，高氮含量为48％。这是通过纳米级硬模板方法来实现的，该方法通过在中孔SBA15二氧化硅纳米模板的有组织的中孔通道内将胍盐酸盐（GndCl）作为单一碳-氮源的简单聚合来实现。所产生的材料通过X射线衍射（XRD）和透射电子显微镜（TEM）进行表征，证实形成了有序的介孔氮化碳，而对孔径分布的分析表明，形成了均匀大小的孔道。 4.56纳米 X射线光电子能谱（XPS）表明gMesoCN由C和N组成。不含金属的gMesoCN材料在碱性介质中对OER具有良好的电催化性能，Tafel斜率为52.4 mV / dec表明OER动力学良好。重要的是 gMesoCN材料具有24小时后保持98.4％的电流密度的长期耐久性。报道的gMesoCN材料便宜，环保且易于合成，具有在电催化领域中应用的潜力。

更新日期：2020-01-09

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