Electrocatalysis of Co/Co_xO_y nanofilms supported by synchronously nitrogen-doped Ketjenblack carbon towards oxygen reduction reaction.

IF 9.4 1区化学 Q1 CHEMISTRY, PHYSICAL

Journal of Colloid and Interface Science Pub Date : 2024-10-01 DOI:10.1016/j.jcis.2024.09.235

Yong Liu, Yumei Chen, Qing Li, Jianchao Shi, Baozhong Liu

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引用次数: 0

Abstract

Developing a highly active and stable non-precious metal catalyst for oxygen reduction reaction (ORR) is of great practical significance for advancing fuel cell technology. In this work, a continuous two-step hydrothermal reaction followed by high temperature pyrolysis were employed to achieve in situ N-doping preferentially into Ketjenblack carbon (KB-N) and composite of KB-N and Co/Co_xO_y nanofilms (Co/Co_xO_y-NFs) as Co/Co_xO_y-NFs@KB-N. The N-doped state strongly affects the ORR activity of catalyst. All prepared Co/Co_xO_y-NFs@KB-N catalysts exhibit observably improved ORR activity compared with the basal KB-N and N-doped Co/Co_xO_y-NFs, in which the optimal Co/Co_xO_y-NFs@KB-N catalyst demonstrate the positive E_onset (0.864 V) and E_1/2 (0.788 V) vs. RHE, the low Tafel slope (69.27 mV dec^-1), implying quick ORR kinetics. And, the Co/Co_xO_y-NFs@KB-N catalyst exhibits highly electrochemical durability. The KB-N substrate can purify Co valence in CoO component, promote amorphization of CoO crystalline structure and enhance the interaction between Co/Co_xO_y-NFs and KB-N in Co/Co_xO_y-NFs@KB-N catalyst. Thus electronic effect, structural effect and synergistic effect can strengthen O₂ adsorption, provide enough adsorbed sites and accelerate electron transfer, resulting in prominent ORR performance of Co/Co_xO_y-NFs@KB-N catalyst.

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同步掺氮 Ketjenblack 碳支持的 Co/CoxOy 纳米薄膜对氧还原反应的电催化作用。

开发一种高活性、高稳定性的非贵金属氧还原反应（ORR）催化剂对于推动燃料电池技术的发展具有重要的现实意义。在这项工作中，采用了连续两步水热反应和高温热解的方法，在原位将 N 优先掺杂到 Ketjenblack 碳（KB-N）以及 KB-N 与 Co/CoxOy 纳米薄膜（Co/CoxOy-NFs）的复合材料 Co/CoxOy-NFs@KB-N。掺杂 N 的状态对催化剂的 ORR 活性有很大影响。与基态 KB-N 和掺杂 N 的 Co/CoxOy-NFs 相比，所有制备的 Co/CoxOy-NFs@KB-N 催化剂都明显提高了 ORR 活性，其中最佳的 Co/CoxOy-NFs@KB-N 催化剂的 Eonset 值（0.864 V）和 E1/2 值（0.788 V）与 RHE 值呈正相关，Tafel 斜率（69.27 mV dec-1）较低，意味着 ORR 动力学发展迅速。此外，Co/CoxOy-NFs@KB-N 催化剂具有很高的电化学耐久性。在 Co/CoxOy-NFs@KB-N 催化剂中，KB-N 衬底可以纯化 CoO 成分中的 Co 价，促进 CoO 晶体结构的非晶化，增强 Co/CoxOy-NFs 与 KB-N 之间的相互作用。因此，电子效应、结构效应和协同效应可加强对 O2 的吸附，提供足够的吸附位点并加速电子传递，从而使 Co/CoxOy-NFs@KB-N 催化剂的 ORR 性能突出。

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来源期刊

Journal of Colloid and Interface Science 化学-物理化学

CiteScore

16.10

自引率

7.10%

发文量

2568

审稿时长

2 months

期刊介绍： The Journal of Colloid and Interface Science publishes original research findings on the fundamental principles of colloid and interface science, as well as innovative applications in various fields. The criteria for publication include impact, quality, novelty, and originality. Emphasis: The journal emphasizes fundamental scientific innovation within the following categories: A.Colloidal Materials and Nanomaterials B.Soft Colloidal and Self-Assembly Systems C.Adsorption, Catalysis, and Electrochemistry D.Interfacial Processes, Capillarity, and Wetting E.Biomaterials and Nanomedicine F.Energy Conversion and Storage, and Environmental Technologies