期刊
CHEMICAL ENGINEERING JOURNAL
卷 401, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.126092
关键词
Ultrafast; Wet chemistry; Large-scale; Self-supported; Electrocatalyst
资金
- National Natural Science Foundation of China [51575135, 51622503, U1537206, 51621091]
- Natural Science Foundation of Heilongjiang Province of China [YQ2019E023]
Herein, in order to promote the scaled-up manufacturing of efficient nanostructured electrocatalysts, we pioneer a novel ultrafast wet chemistry engineering to turn bulk Co-Ni foam into S activated hydroxide based nanosheets (CoNi-OH vertical bar S), with short period less than six minutes. The uniform nanosheets morphology is in-situ formed through designed nitro-hydrochloric acid enhanced corrosion within 30 s, then the nanosheets are naturally oxidized to CoOOH/Ni(OH)(2) (CoNi-OH) when drying in the air. To fully boost the electrochemical activities, S activation is conducted through facile chemical bath in S anion-rich aqueous solution with five minutes. The as formed surface sulfur species could optimize the protons adsorption, thus benefitting the HER electrocatalysis. Besides, the Co3+ sites with low coordination are also increased by S activation, which could facilitate the deprotonation of OOH, thus promoting the OER electrocatalysis. Finally, such ultrafast surface engineering derived CoNi-OH vertical bar S electrodes afford the relatively low overpotentials of 167 mV for HER and 270 mV for OER at 10 mA cm(-2). This wet chemistry strategy further ensures that the large area self-supported electrodes can be easily prepared within several minutes, which would inspire the large-scale synthesis and practical application of similar electrocatalysts in this field.
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