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用 Co3O4 花装饰生物漂白镍铁合金表面，实现高效电催化制氢。

花匠小妙招
2025-01-08 03:41

IF 8.3 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Anaswara Anil, Thaju Chithrajakumary Bhagya, Babu Indira Bijimol, Sarika Sasidharan, Muraleedharan Sheela Meera, Sheik Muhammadhu Aboobakar Shibli

摘要

在通过电解水实现可持续制氢的过程中，开发高性能、不含惰性金属的催化系统是非常必要的。在此，我们提出了一种开发电催化剂的创新策略，即通过微生物技术改善镍铁合金的表面特性，然后用完整且相互连接的二维（2D）Co3O4 量身定制三维分层花状结构，从而富集活性位点。由此产生的三维 Co3O4@NiFeP-5/24h 具有多孔结构，由覆盖整个催化表面的交叉纳米颗粒组成。这种设计确保了电解质离子的全面渗透，有利于气泡的释放，同时降低了气泡粘附率。值得注意的是，Co3O4@NiFeP-5/24h 电极在碱性介质中表现出卓越的氢进化（HER）性能，其特点是稳定性高、过电位低（10 mA cm-2 电流密度下为 106 mV）、塔菲尔斜率低（98 mV dec-1）。此外，电极相与电解液相之间的界面接触电阻最小化也凸显了三维 Co3O4@NiFeP-5/24h 电极的高 HER 性能。本文所采用的创新设计和制备策略具有推动水分离电催化领域发展的巨大潜力，为合理设计和开发不含惰性金属的电催化剂提供了一条充满希望的道路。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Architectural Decoration of Bioleached NiFeP Surfaces by Co3O4 Flowers for Efficient Electrocatalytic Hydrogen Generation.

In the quest for sustainable hydrogen production via water electrolysis, the development of high-performance, noble-metal-free catalytic systems is highly desired. Herein, we proposed an innovative strategy for the development of an electrocatalyst by refining the surface characteristics of a NiFeP alloy through microbiological techniques and subsequent enrichment of active sites by tailoring 3D hierarchical flower-like structures with intact and interconnected two-dimensional (2D) Co3O4. The resultant 3D Co3O4@NiFeP-5/24h has a porous structure comprised of intercrossed nanoparticles covering the entirety of the catalytic surface. This design ensures comprehensive electrolyte ion penetration and facilitates the release of gas bubbles while reducing bubble adhesion rates. Remarkably, the Co3O4@NiFeP-5/24h electrode demonstrates superior hydrogen evolution (HER) performance in an alkaline medium, characterized by its high stability, low overpotential (106 mV at a current density of 10 mA cm-2), and reduced Tafel slope (98 mV dec-1). Besides, the minimized interfacial contact resistance among the phases of electrode and electrolyte emphasizes the high HER performance of the 3D Co3O4@NiFeP-5/24h electrode. The innovative design and fabrication strategy employed herein holds significant potential for advancing the field of water-splitting electrocatalysis, offering a promising path toward the rational design and development of noble-metal-free electrocatalysts.

来源期刊

ACS Applied Materials & Interfaces

期刊介绍： ACS Applied Materials & Interfaces is a leading interdisciplinary journal that brings together chemists, engineers, physicists, and biologists to explore the development and utilization of newly-discovered materials and interfacial processes for specific applications. Our journal has experienced remarkable growth since its establishment in 2009, both in terms of the number of articles published and the impact of the research showcased. We are proud to foster a truly global community, with the majority of published articles originating from outside the United States, reflecting the rapid growth of applied research worldwide.