Development of carbon dots supported on Zr-MOFs nano-composites for effective oxygen evolution reaction

IF 4.3 3区 材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS
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Abstract

Efficient hydrogen generation from water splitting is a key component of the hydrogen economy. It has been extensively researched for decades how electrochemically splitting water using electrocatalysts might provide a sustainable and environmentally friendly hydrogen energy source. Sluggish kinetics of the oxygen evolution reaction (OER) hinders the process of overall water splitting. Although metal-organic frameworks (MOFs) are attractive for generation of effective OER electrocatalysts, their activity is significantly hindered by their inherent lower conductivity. Here, we demonstrate a Zr-MOF-based composite with carbon dots (CDs) in order to increase their OER activity. Its exceptional morphology with higher porosity and greater surface area results in enhanced electrochemical activity. It reveals tremendously low onset potential, i.e., 1.40 V vs. RHE, and a remarkably small overpotential of 1.45 V vs. RHE to attain benchmark current density. It exhibited a minimal Tafel value of 37 mV/dec, conquering state-of-the-art catalysts for OER. The fabricated electrocatalyst demonstrated a lower charge transfer resistance (Rct) of 0.248 Ω, with exceptional durability for about 20 h in chronoamperometric studies and for up to 1500 CV cycles. All these results demonstrated that as-fabricated Zr-MOF-based composite is a probable and potential candidate for OER.

Abstract Image

开发以 Zr-MOFs 纳米复合材料为支撑的碳点,用于有效的氧进化反应
通过水分裂高效制氢是氢经济的关键组成部分。几十年来,人们一直在广泛研究如何利用电催化剂进行电化学水分裂,从而提供一种可持续且环保的氢能源。氧进化反应(OER)的缓慢动力学阻碍了整体水分离过程。虽然金属有机框架(MOFs)对生成有效的氧进化反应电催化剂很有吸引力,但其固有的较低导电性大大阻碍了它们的活性。在此,我们展示了一种基于 Zr-MOF 与碳点 (CD) 的复合材料,以提高其 OER 活性。它具有更高的孔隙率和更大的表面积,其特殊的形貌增强了电化学活性。它显示出极低的起始电位,即 1.40 V(相对于 RHE),以及 1.45 V(相对于 RHE)的极小过电位,从而达到基准电流密度。它的最小塔菲尔值为 37 mV/dec,超越了最先进的 OER 催化剂。所制备的电催化剂具有较低的电荷转移电阻(Rct),为 0.248 Ω,在计时器研究中可持续约 20 小时,并可持续 1500 个 CV 循环,具有极高的耐用性。所有这些结果表明,制备的基于 Zr-MOF 的复合材料可能是 OER 的潜在候选材料。
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来源期刊
Diamond and Related Materials
Diamond and Related Materials 工程技术-材料科学:综合
CiteScore
6.00
自引率
14.60%
发文量
702
审稿时长
2.1 months
期刊介绍: DRM is a leading international journal that publishes new fundamental and applied research on all forms of diamond, the integration of diamond with other advanced materials and development of technologies exploiting diamond. The synthesis, characterization and processing of single crystal diamond, polycrystalline films, nanodiamond powders and heterostructures with other advanced materials are encouraged topics for technical and review articles. In addition to diamond, the journal publishes manuscripts on the synthesis, characterization and application of other related materials including diamond-like carbons, carbon nanotubes, graphene, and boron and carbon nitrides. Articles are sought on the chemical functionalization of diamond and related materials as well as their use in electrochemistry, energy storage and conversion, chemical and biological sensing, imaging, thermal management, photonic and quantum applications, electron emission and electronic devices. The International Conference on Diamond and Carbon Materials has evolved into the largest and most well attended forum in the field of diamond, providing a forum to showcase the latest results in the science and technology of diamond and other carbon materials such as carbon nanotubes, graphene, and diamond-like carbon. Run annually in association with Diamond and Related Materials the conference provides junior and established researchers the opportunity to exchange the latest results ranging from fundamental physical and chemical concepts to applied research focusing on the next generation carbon-based devices.
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