Ir nanoclusters on ZIF-8-derived nitrogen-doped carbon frameworks to give a highly efficient hydrogen evolution reaction

IF 5.7 3区 材料科学 Q2 Materials Science
Xi-ao Wang , Yan-shang Gong , Zhi-kun Liu , Pei-shan Wu , Li-xue Zhang , Jian-kun Sun
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Abstract

The precise change of the electronic structure of active metals using low-active supports is an effective way of developing high-performance electrocatalysts. The electronic interaction of the metal and support provides a flexible way of optimizing the catalytic performance. We have fabricated an efficient hydrogen evolution reaction (HER) electrocatalyst, in which Ir nanoclusters are uniformly loaded on a nitrogen-doped carbon framework (Ir@NC). The synthesis process entails immersing an annealed zeolitic imidazolate framework-8 (ZIF-8), prepared at 900 °C as a carbon source, into an IrCl3 solution, followed by a calcination-reduction treatment at 400 °C under a H2/Ar atmosphere. The three-dimensional porous structure of the nitrogen-doped carbon framework exposes more active metal sites, and the combined effect of the Ir clusters and the N-doped carbon support efficiently changes the electronic structure of Ir, optimizing the HER process. In acidic media, Ir@NC has a remarkable HER electrocatalytic activity, with an overpotential of only 23 mV at 10 mA cm−2, an ultra-low Tafel slope (25.8 mV dec−1) and good stability for over 24 h at 10 mA cm−2. The high activity of the electrocatalyst with a simple and scalable synthesis method makes it a highly promising candidate for the industrial production of hydrogen by splitting acidic water.

ZIF-8 衍生的掺氮碳框架上的 Ir 纳米团簇实现高效氢进化反应
利用低活性支撑物精确改变活性金属的电子结构是开发高性能电催化剂的有效方法。金属与载体的电子相互作用为优化催化性能提供了灵活的途径。我们制备了一种高效的氢进化反应(HER)电催化剂,其中 Ir 纳米团簇均匀地负载在掺氮碳框架(Ir@NC)上。合成过程是将在 900 ℃ 下作为碳源制备的退火沸石咪唑酸盐框架-8(ZIF-8)浸入 IrCl3 溶液中,然后在 400 ℃ 的 H2/Ar 气氛下进行煅烧-还原处理。掺氮碳框架的三维多孔结构暴露了更多的活性金属位点,Ir 簇和掺氮碳支持物的共同作用有效地改变了 Ir 的电子结构,优化了 HER 过程。在酸性介质中,Ir@NC 具有显著的 HER 电催化活性,在 10 mA cm-2 的条件下过电位仅为 23 mV,具有超低的 Tafel 斜坡(25.8 mV dec-1),并且在 10 mA cm-2 的条件下可稳定运行 24 小时以上。该电催化剂的高活性以及简单、可扩展的合成方法,使其成为通过分离酸性水进行工业制氢的极具潜力的候选材料。
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来源期刊
New Carbon Materials
New Carbon Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
6.10
自引率
8.80%
发文量
3245
审稿时长
5.5 months
期刊介绍: New Carbon Materials is a scholarly journal that publishes original research papers focusing on the physics, chemistry, and technology of organic substances that serve as precursors for creating carbonaceous solids with aromatic or tetrahedral bonding. The scope of materials covered by the journal extends from diamond and graphite to a variety of forms including chars, semicokes, mesophase substances, carbons, carbon fibers, carbynes, fullerenes, and carbon nanotubes. The journal's objective is to showcase the latest research findings and advancements in the areas of formation, structure, properties, behaviors, and technological applications of carbon materials. Additionally, the journal includes papers on the secondary production of new carbon and composite materials, such as carbon-carbon composites, derived from the aforementioned carbons. Research papers on organic substances will be considered for publication only if they have a direct relevance to the resulting carbon materials.
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