期刊
JOURNAL OF CATALYSIS
卷 373, 期 -, 页码 180-189出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2019.03.039
关键词
Nanoporous Ni(Cu) alloy; Mesoporous NiFeP; Triple-hierarchy heterostructure; Hydrogen evolution reaction; Hydrazine oxidation
资金
- National Natural Science Foundation of China [21273144, 21603134]
- Natural Science Basic Research Plan in Shaanxi Province of China [2016JQ2023]
- Australian Research Council Discovery [FT170100224]
Replacing kinetically sluggish oxygen evolution reaction (OER) with hydrazine oxidation (HzOR) is an effective strategy for water electrolysis to achieve sustainable hydrogen production. Here we report triple-hierarchical nanoporous Ni(Cu)@NiFeP onto nickel foam (NM) as a bifunctional electrocatalyst for HER and HzOR. The as-prepared catalyst with a 54-fold increased electrochemical active surface area (ECSA) presents remarkable HzOR activity, requiring a potential of 6 mV to achieve 10 mA cm(-2) in 1 M KOH, which is comparable to commercial Pt/C. Assembling in an electrolyzer for HER and HzOR, the Ni (Cu)@NiFeP/NM cell requires a cell voltage of 0.491 V to offer 100 mA cm(-2), far lower than that of overall water splitting. The superior catalytic performance is ascribed to the synergistic effect from crystalline Ni (Cu) alloy and amorphous NiFe P-derivatives, as well as structural advantages of the unique 3D hierarchical porous nanostructures. The study also presents a strategy for accurate design and construction of multiple hierarchy of nanomaterials for energy storage and conversion devices. (C) 2019 Elsevier Inc. All rights reserved.
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