Core/shell Ni@C particle-supported N-doped carbon with hollow capsules for efficient electrocatalytic reduction of oxygen

IF 8.1 2区 工程技术 Q1 CHEMISTRY, PHYSICAL International Journal of Hydrogen Energy Pub Date : 2024-08-01 DOI:10.1016/j.ijhydene.2024.07.424
Jian Gao , Lingxin Meng , Na Ma , Xiaoyao Tan , Yuan Li , Hong Wang , Peng Zhang
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Abstract

To replace the noble metal catalysts for oxygen reduction reaction (ORR), a Ni@C-supported N-doped carbon material (Ni@C/NC) is in-situ prepared via one-step pyrolyzing the polymerizable ionic liquid of vinyl imidazole combined with Ni(NO3)2. Systemic investigations demonstrate that these nanosized Ni particles are tightly wrapped with a thin carbon layer to form the core/shell structure, meanwhile carbon capsules are synchronously yielded on the carbon matrix. As a result, both the carbon shell and the carbon capsule jointly increase the active sites of the Ni@C/NC, while the carbon shell also contributes the fast electron-transfer from Ni particle. Compared with the normal Ni-supported carbon catalyst, the Ni@C/NC shows the respectable ORR performance with the onset and half-wave potentials of 0.96 and 0.84 VRHE. After the long-term electrocatalysis (10 h), the Ni@C/NC is found to possess the great structural and electrocatalytic stabilities, which maintains 93 % of the initial current density and the well-dispersed and uniform Ni@C particles. Subsequently, a Zn-Air battery with the Ni@C/NC cathode is assembled and exhibits a peak power density of 200 mW cm−2. Therefore, the as-obtained Ni@C/NC with the high electroactivity and stability can be expected as an ideal candidate to apply in the metal-air batteries and fuel cells in the future.

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核/壳 Ni@C 粒子支撑的掺杂 N 的空心碳,用于高效电催化还原氧气
为了取代贵金属催化剂用于氧还原反应(ORR),我们通过一步热解可聚合的乙烯基咪唑离子液体与 Ni(NO3)2 结合,原位制备了一种 Ni@C 支持的 N 掺杂碳材料(Ni@C/NC)。系统研究表明,这些纳米镍粒子被一层薄碳层紧紧包裹,形成核/壳结构,同时在碳基体上同步生成碳囊。因此,碳壳和碳囊共同增加了 Ni@C/NC 的活性位点,同时碳壳还有助于镍粒子的快速电子转移。与普通的镍支撑碳催化剂相比,Ni@C/NC 的 ORR 性能可观,起始电位和半波电位分别为 0.96 VRHE 和 0.84 VRHE。经过长期电催化(10 小时)后,发现 Ni@C/NC 具有很高的结构稳定性和电催化稳定性,能保持 93% 的初始电流密度和分散均匀的 Ni@C 颗粒。随后,使用 Ni@C/NC 阴极组装了锌-空气电池,其峰值功率密度为 200 mW cm-2。因此,获得的 Ni@C/NC 具有高电活性和稳定性,有望成为未来应用于金属空气电池和燃料电池的理想候选材料。
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来源期刊
International Journal of Hydrogen Energy
International Journal of Hydrogen Energy 工程技术-环境科学
CiteScore
13.50
自引率
25.00%
发文量
3502
审稿时长
60 days
期刊介绍: The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc. The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.
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