High loading of NiFe active sites on a melamine formaldehyde carbon-based aerogel towards efficient bi-functional electrocatalysis for water splitting,Sustainable Energy & Fuels

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High loading of NiFe active sites on a melamine formaldehyde carbon-based aerogel towards efficient bi-functional electrocatalysis for water splitting
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2021-08-23 , DOI: 10.1039/d1se01149a
Zhi Chen _{1,

2} , Shu Zhang ₁ , Jian Yang ₁ , Cheng Chen ₁ , Yaochen Song _{1,

2} , Caili Xu ₁ , Mengqiang Wu ₁ , Jiaxuan Liao _{1,

2}

Affiliation

Compared with precious metals, base metals have large abundance in the earth's crust and a much lower price. Thus, the research and development of base metal-based catalysts focus on improving the performance of catalysts with less consideration of the influence of metal content on the cost. Herein, we report the synthesis and catalysis properties of two base metal (Ni and Fe) catalysts supported by a high nitrogen containing carbon aerogel. A melamine formaldehyde (MF) aerogel was used as a support, and high concentration of Ni²⁺/Fe³⁺ metal ions were in situ implanted into the three-dimensional network of gels in the sol–gel process. The high metal loading of 43 wt% provided adequate active sites for the catalytic process. The high N content of 11.3 wt% in MF aerogels also improved the surface structure effect of the catalysts during the catalytic process. The prepared aerogel-based catalysts exhibited enhanced catalytic activity for both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER). The two-electrode system for water splitting, with prepared samples as the anode and the cathode, exhibited a current density of 10 mA cm⁻² at 1.63 V. This high loading and high yield catalyst synthesis method provides a new potential way for the synthesis of functional catalysts.

中文翻译：

在三聚氰胺甲醛碳基气凝胶上高负载NiFe活性位点以实现高效的双功能电催化分解水

与贵金属相比，贱金属在地壳中的丰度大，价格也低得多。因此，贱金属基催化剂的研发侧重于提高催化剂的性能，较少考虑金属含量对成本的影响。在此，我们报告了由高含氮碳气凝胶负载的两种贱金属（Ni 和 Fe）催化剂的合成和催化性能。以三聚氰胺甲醛（MF）气凝胶为载体，原位高浓度Ni ²⁺ /Fe ³⁺金属离子在溶胶-凝胶过程中植入凝胶的三维网络。43 wt% 的高金属负载量为催化过程提供了足够的活性位点。MF 气凝胶中 11.3 wt% 的高 N 含量也改善了催化剂在催化过程中的表面结构效果。制备的气凝胶基催化剂对析氢反应（HER）和析氧反应（OER）均表现出增强的催化活性。以制备的样品为阳极和阴极的双电极水分解系统在 1.63 V 下表现出 10 mA cm ^-2的电流密度。这种高负载和高产率的催化剂合成方法为合成提供了新的潜在途径功能性催化剂。

更新日期：2021-09-03

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