Evaluating Properties of Carbon-Free Nano-NiCoFe-LDHs with Molybdate as Oxygen Evolution Catalysts and Their Applications in Rechargeable Air Electrodes

被引:7
作者
Liu, Qiang [1 ]
Zhou, Fang [1 ]
Bai, Yuying [1 ]
Hu, Weikang [1 ]
机构
[1] Zhejiang Normal Univ, Coll Chem & Life Sci, Minist Educ, Key Lab Adv Catalyt Mat, Jinhua 321004, Zhejiang, Peoples R China
基金
中国国家自然科学基金;
关键词
LAYERED DOUBLE HYDROXIDES; INTRINSIC ACTIVITY; NANOSHEET ARRAYS; WATER; ELECTROCATALYSTS; EFFICIENT; IRON; PARAMETERS; OXIDATION;
D O I
10.1021/acs.energyfuels.1c03475
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
The issues of carbon corrosion, oxidation, and catalytic stability for most electrocatalysts of oxygen evolution reaction (OER) remain great challenges under high oxidizing environments. Herein, we report carbon-free nano-NiCoFe layered double hydroxides (LDHs) with MoO42- anions to alleviate these issues. An excellently active catalyst of nanocarbon-free NiCo1.5Fe0.5-LDH with 14.9 at. % MoO42- was synthesized by a chemical coprecipitation method that shows superior OER performance having an overpotential of 239 mV@10 mA cm(Geo)(-2), a Tafel slope of 43 mV dec(-1), and excellent long-term stability (200 h no degradation) at 100 mA cm(Geo)(-2). The outstanding performance is ascribed to the excellent stability of carbon-free powder catalysts with no carbon corrosion under high oxidizing environments, while the high catalytic activity is attributed to the enhanced synergistic effects between multiple metals of Ni-III, Co-III, and Fe-III, the size reduction and formation of high specific surface areas, and poor crystallinity after molybdate introduction. In this work, a durably rechargeable air electrode for metal-air batteries was fabricated using the electrocatalyst, which exhibits low charging voltage (1.882 V@20 mA cm(-2) vs Zn), excellent cycling stability, and a low voltage gap (0.67 V) at 20 mA cm(-2) in the atmosphere environment (air as the reactive gas). The paper discussed two strategies to promote OER activities and presents a feasible approach to tackle the tricky issues of carbon corrosion and oxidation for rechargeable air electrodes in alkaline medium under high oxidizing environments.
引用
收藏
页码:20374 / 20385
页数:12
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