Ni-Zn nanosheet anchored on rGO as bifunctional electrocatalyst for efficient alkaline water-to-hydrogen conversion via hydrazine electrolysis
Ni-Zn nanosheet anchored on rGO as bifunctional electrocatalyst for efficient alkaline water-to-hydrogen conversion via hydrazine electrolysis
复制标题
锚定在 rGO 上的 Ni-Zn 纳米片作为双功能电催化剂，通过肼电解将碱性水高效转化为氢气
DOI：
10.1016/j.ijhydene.2020.05.120
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发表时间：
2020
影响因子：
7.2
通讯作者：
Pengfei Xing
中科院分区：
文献类型：
--
作者：
Zhongbao Feng;Han Zhang;Bo Gao;Pai Lu;Dagang Li;Pengfei Xing
Bifunctional Ni-15 at.% Zn/rGO catalyst was fabricated by a two-step electrodeposition to be used for efficient alkaline water-to-hydrogen conversion via hydrazine electrolysis. Experiments show that the as-deposited Ni-15 at.% Zn/rGO nanosheet arrays with porous structure possesses excellent catalytic activity and stability towards both hydrogen evolution reaction (HER) and hydrazine oxidation reaction (HzOR). A small overpotential of 49 mV at 10 mA cm−2with a low Tafel slope of 26.3 mV dec−1, and a retention rate of 91.4% after 12 h at 10 mA cm−2are observed for Ni-15 at.% Zn/rGO towards HER. Moreover, Ni-15 at.% Zn/rGO also shows an extra-high current density of 1097 mA cm−2at 0.6 V vs RHE with a low Tafel slope of 33.5 mV dec−1, and a high durability of 90.5% after 5000 s towards HzOR. Moreover, two-electrode cell was constructed using Ni-15 at.% Zn/rGO as both cathode and anode for HER and HzOR, achieving 100 mA cm−2at an ultralow cell voltage of 0.418 V. The above outstanding bifunctional catalytic performance should be attributed to its large ECSA, high electrical conductivity and most importantly, its superaerophobic surface induced by the porous structure with nanosheet arrays.
