Jiaxuan Bai, Ming Hao, Xiaoyu Han, Pengfei Zhou, Hairui Yao, Liang Bian, Guanling Yang, Jinsheng Liang, Richard M. Laine, Fei Wang
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引用次数: 0
Abstract
The oxygen evolution reaction (OER) is regarded as the bottleneck of electrolytic water splitting. Thus, developing robust earth-abundant electrocatalysts for efficient OER has received a great deal of attention and it is an ongoing scientific challenge. Herein, hierarchical hollow nanorods assembled with ultrathin mesoporous cobalt silicate hydroxide nanosheets (denoted as CoSi) were successfully fabricated, using the silica nanotube derived from halloysite as a sacrificial template, via a simple hydrothermal method. The resulting cobalt silicate hydroxide nanosheets stack with thicknesses ∼10 nm, as confirmed by transmission electron microscopy. The elaborated nanoarchitecture possesses a high specific surface area (SSA) allowing good exposure to the cobalt active centers exhibiting superior catalytic activity vs analogs synthesized using sodium silicate. Among all as-prepared CoSi samples, those synthesized at 150°C (CoSi-150) exhibited the minimum overpotential of ∼347 mV at a current density of 10 mA cm–2. In addition, CoSi-150 also exhibited superior performance against typical cobalt-based catalysts, and its surface hydroxyl groups were beneficial for the enhancement of OER performance. Furthermore, the CoSi-150 showed excellent durability and stability after the 105 s chronopotentiometry test in 1 M KOH. This design concept provides a new strategy for the low-cost preparation of high-quality cobalt water splitting electrocatalysts.
氧进化反应(OER)被认为是电解水分离的瓶颈。因此,开发用于高效 OER 的强效富土电催化剂受到了广泛关注,这也是一项持续的科学挑战。在此,研究人员利用从埃洛石中提取的二氧化硅纳米管作为牺牲模板,通过简单的水热法,成功制备了由超薄介孔硅酸钴氢氧化物纳米片(简称 CoSi)组装而成的分层空心纳米棒。透射电子显微镜证实,所制备的氢氧化硅钴纳米片的堆积厚度为 10 纳米。精心制作的纳米结构具有很高的比表面积(SSA),使钴活性中心能够很好地暴露出来,与使用硅酸钠合成的类似物相比,具有更高的催化活性。在所有制备的 CoSi 样品中,在 150°C 下合成的 CoSi 样品(CoSi-150)在电流密度为 10 mA cm-2 时的过电位最低,为 ∼347 mV。此外,与典型的钴基催化剂相比,CoSi-150 还表现出更优越的性能,其表面羟基有利于提高 OER 性能。此外,在 1 M KOH 中进行 105 秒计时电位测试后,CoSi-150 表现出了卓越的耐久性和稳定性。这种设计理念为低成本制备高质量钴水分离电催化剂提供了一种新策略。
期刊介绍:
Journal of Materials Science & Technology strives to promote global collaboration in the field of materials science and technology. It primarily publishes original research papers, invited review articles, letters, research notes, and summaries of scientific achievements. The journal covers a wide range of materials science and technology topics, including metallic materials, inorganic nonmetallic materials, and composite materials.