Yu Zhang, Weimeng Chi, Zhuoxun Yin, Xinzhi Ma, Yang Zhou, Wanqiang Liu, Jinlong Li
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引用次数: 0
摘要
尿素氧化反应(UOR)被认为是一种理想的水分离反应,有可能取代氧进化反应(OER),因为它能降低阳极电位,并利用尿素这种可再生的丰富资源。然而,创造稳定、有效的双功能催化剂仍具有挑战性。在这项工作中,我们报告了一种新型核壳结构 Ni-500 纳米粒子双功能催化剂。碳涂层不仅提供了大量活性位点,促进了电荷的快速转移,还保护了镍核免受腐蚀。此外,通过补充尿素浓度,电流密度可恢复并维持 50 小时,且仅下降 8%。与纯水电解相比,以 Ni-500 为阴极和阳极的尿素辅助水电解槽在 100 mA cm 条件下可获得 1.55 V 的电池电压。这项工作证明了 Ni-500 作为一种廉价而有效的催化剂用于尿素制氢的潜力,并为核壳结构电催化剂的设计和优化提供了新的视角。
Nickel metal particles encapsulated in carbon shells as efficient bifunctional electrocatalysts for urea-assisted hydrogen production
Urea oxidation reaction (UOR) is considered an ideal water splitting reaction with the potential to replace oxygen evolution reaction (OER), as it lowers the anodic potential and utilizes urea as a renewable and abundant resource. However, creating stable, effective bifunctional catalysts is still challenging. In this work, we report a novel bifunctional catalyst of core-shell structure Ni-500 Nano-particle. The carbon coating not only offers numerous active sites and facilitates rapid charge transfer but also shields the nickel core from corrosion. Moreover, By replenishing the urea concentration, the current density can be recovered and sustained for 50 h with only an 8 % decrease. It is significantly less than pure water electrolysis that the urea-assisted water electrolyzer with Ni-500 as both cathode and anode achieves cell-voltage of 1.55 V at 100 mA cm. This work demonstrates the potential of Ni-500 as a inexpensive and effective catalyst for urea-based hydrogen production, and offers new perspectives into the design and optimization for core-shell structure electrocatalyst.
期刊介绍:
The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.