Jizuo Zhao, Weibing Wu, Xiangyu Jia, Zhenlu Zhao and Xun Hu
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引用次数: 5
Abstract
Electrochemical water splitting is restrained by the sluggish oxygen evolution reaction (OER) due to the four-proton-coupled electron transfer. One key strategy for efficient large-scale production of hydrogen by water splitting is to design an electrode structure with low OER overpotential. Herein, a coaxial three-layer structure for the OER electrode is constructed by electroplating Ni on Cu mesh and then loading (Ni,Fe)OxHy catalyst via a modified solvothermal method. The obtained coaxial three-layer (Ni,Fe)OxHy/Ni/Cu mesh electrode exhibits an excellent OER performance with the overpotentials of 199 and 250 mV at 10 and 50 mA cm?2 and stability for over 72 h in 1 M KOH. The plated Ni layer is critical for the coaxial three-layer (Ni,Fe)OxHy/Ni/Cu mesh structure since it improves its stability by preventing Cu from corroding and meanwhile enhances the adhesive strength of (Ni,Fe)OxHy to the substrate because of its poor crystallinity, which facilitates charge transfer and leads to the extremely low overpotentials. Compared with Ni foam and Ni mesh, Cu mesh is more suitable for high production rate and large-area water splitting at large overpotentials because of its excellent conductivity and lower series electric resistance (Rs). Together with the extremely low cost of Cu mesh, the present coaxial three-layer (Ni,Fe)OxHy/Ni/Cu mesh electrode is promising for future industrial application.
四质子耦合电子转移导致的缓慢析氧反应(OER)抑制了电化学水分解。设计具有低OER过电位的电极结构是实现大规模高效水裂解制氢的关键策略之一。本文通过在Cu网上电镀Ni,然后通过改进的溶剂热法加载(Ni,Fe)OxHy催化剂,构建了OER电极的同轴三层结构。得到的同轴三层(Ni,Fe)OxHy/Ni/Cu网状电极在10和50 mA cm?下的过电位分别为199和250 mV,具有优异的OER性能。2,在1 M KOH中稳定性超过72 h。镀Ni层对同轴三层(Ni,Fe)OxHy/Ni/Cu网状结构至关重要,因为它可以防止Cu的腐蚀,从而提高其稳定性;同时,由于(Ni,Fe)OxHy结晶度差,从而提高了其与基体的结合强度,有利于电荷转移,导致过电位极低。与Ni泡沫和Ni网相比,Cu网具有优异的导电性和较低的串联电阻(Rs),更适合于大过电位下的高产率和大面积劈水。再加上Cu网极低的成本,目前的同轴三层(Ni,Fe)OxHy/Ni/Cu网电极在未来的工业应用中具有广阔的前景。
期刊介绍:
A multidisciplinary journal focusing on cutting edge research across all fundamental science and technological aspects of catalysis.
Editor-in-chief: Bert Weckhuysen
Impact factor: 5.0
Time to first decision (peer reviewed only): 31 days