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氧化铈-镍钨复合电极的制备及其析氢催化性能
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西北有色金属研究院

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陕西省重点研发计划(项目号2021GY-210)


Preparation of cerium oxide Ni-W composite electrode and its Catalytic performance for hydrogen evolution reaction
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    摘要:

    以70um厚的Ni-6W合金薄带为基体,采用阳极氧化法制备纳米多孔NiW后,再化学溶液沉积CeO2制备Ni和CeO2 (200)晶面暴露的纳米多孔NiW-CeO2电极。采用扫描电镜(SEM)、X射线衍射(XRD)和XPS对电极形貌和表面结构进行表征。通过阴极极化曲线、循环伏安曲线和电化学阻抗技术表征各电极的电解析氢行为。结果表明(200)晶面暴露的纳米多孔NiW-CeO2电极比Ni(111)晶面暴露的Ni-CeO2电极和无择优取向的Ni-S-CeO2和Ni-Zn-CeO2电极的析氢性能好。该复合电极具有比文献中所报道的共沉积的Ni-CeO2更高的交换电流密度1.7×10-1A cm-2。在1M NaOH溶液中达到100 mA cm-2电流密度时,过电位比NiW-CeO2电极和NiW电极分别降低了分别降低55mV和81mV。对CeO2加入后对整个析氢过程的电化学过程的影响进行了分析。本文通过该合成方法来控制CeO2的形貌,继而选择性暴露(200)晶面,实现对NiW-CeO2复合电极的析氢催化性能的调控。

    Abstract:

    Ni-6W alloy strip with 70μm thick was used as substrate, nanoporous NiW was prepared by anodic oxidation method, and then CeO2 was deposited by chemical decomposition method on nanoporous NiW to prepare NiW-nano-CeO2 electrode. The morphology structure of the NiW, nanoporous NiW and NiW-nano-CeO2 three electrodes were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and XPS. The electrochemical hydrogen evolution behaviors of the three electrodes were characterized by cathodic polarization curves, cyclic voltammetry curves and electrochemical impedance techniques. The results show that NiW-nano-CeO2 electrode has the highest electrocatalytic hydrogen evolution performance, which is mainly due to the three-dimensional nanoporous structure, small mass transfer impedance, large electrochemically active specific surface area and the synergistic effect between NiW and CeO2. When used as an electrocatalyst for hydrogen evolution, the current density reaches 100 mA cm-2 in 1M NaOH solution, it is 55 mV and 81 mV lower than that of NiW-CeO2 lectrode and NiW electrode, respectively. The impedance spectra obtained were fitted and analyzed, and the influence of CeO2 on the electrochemical process of the whole hydrogen evolution process was analyzed. The results show that the hydrogen evolution performance of the (200) crystal-exposed nano-porous NiW-CeO2 electrode is better than that of the Ni (111) crystal-exposed NiW-CeO2 electrode and the non-preferential orientation Ni-S/ CeO2, Ni-Zn/ CeO2 electrode. The composite electrode has a higher exchange current density of 1.7 × 10-1A cm-2 than the co-deposited Ni-CeO2 reported in the literature. In this paper, the morphology of CeO2 was controlled by this method, and then the (200) crystal face was selectively exposed to control the catalytic performance of NiW-CeO2 composite electrode for hydrogen evolution.

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李亚宁,李广忠,杨保军.氧化铈-镍钨复合电极的制备及其析氢催化性能[J].稀有金属材料与工程,2023,52(3):1022~1026.[Li Yaning, Li Guangzhong, Yang Baojun. Preparation of cerium oxide Ni-W composite electrode and its Catalytic performance for hydrogen evolution reaction[J]. Rare Metal Materials and Engineering,2023,52(3):1022~1026.]
DOI:10.12442/j. issn.1002-185X.20220736

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  • 收稿日期:2022-09-15
  • 最后修改日期:2022-11-04
  • 录用日期:2022-11-24
  • 在线发布日期: 2023-04-07
  • 出版日期: 2023-03-24