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Ultrafast room-temperature synthesis of porous S-doped Ni/Fe (oxy)hydroxide electrodes for oxygen evolution catalysis in seawater splitting†


LuoYu,ab LiboWu,a BrianMcElhenny,a ShaoweiSong,a DanLuo, a FanghaoZhang,a YingYu, *b ShuoChen *aand ZhifengRen *a

* Corresponding authors

a Department of Physics và Texas Center for Superconductivity at the University of Houston (TcSUH), University of Houston, Houston, TX 77204, USA E-mail: schen34


Xem thêm: Soạn Ôn Tập Văn Học Trung Đại Việt Nam (Chi Tiết), Soạn Văn Bài: Ôn Tập Văn Học Trung Đại Việt Nam

uh.edu

b College of Physical Science và Technology, Central trung quốc Normal University, Wuhan 430079, đài loan trung quốc E-mail: yuying01

Developing energy- & time-saving methods to synthesize active và stable oxygen evolving catalysts is of great significance to lớn hydrogen production from water electrolysis, which however remains a grand challenge. Here we report a one-step approach to grow highly porous S-doped Ni/Fe (oxy)hydroxide catalysts on Ni foam in several minutes under room temperature. This ultrafast method effectively engineers the surface of Ni foam into a rough S-doped Ni/Fe (oxy)hydroxide layer, which has multiple levels of porosity & good hydrophilic features & exhibits extraordinary oxygen evolution reaction (OER) performance in both alkaline salty water và seawater electrolytes. Specifically, the S-doped Ni/Fe (oxy)hydroxide catalyst requires low overpotentials of 300 & 398 mV to lớn deliver current densities of 100 và 500 mA cm−2, respectively, when directly used as an OER catalyst in alkaline natural seawater electrolyte. Using this OER catalyst together with an efficient hydrogen evolution reaction catalyst, we have achieved the commercially demanded current densities of 500 & 1000 mA cm−2 at low voltages of 1.837 & 1.951 V, respectively, for overall alkaline seawater electrolysis at room temperature with very good durability. This work affords a cost-efficient surface engineering method lớn steer commercial Ni foam into robust OER catalysts for seawater electrolysis, which has important implications for both the hydrogen economy & environmental remediation.