期刊
JOURNAL OF ENERGY CHEMISTRY
卷 66, 期 -, 页码 657-665出版社
ELSEVIER
DOI: 10.1016/j.jechem.2021.09.023
关键词
Spray pyrolysis; Oxygen evolution catalysts; Layered oxyhydroxide; Heterogeneous structure; Thin film
资金
- National Natural Science Foundation of China (NSFC) [21805298, 21905288, 51904288]
- Zhejiang Provincial Natural Science Foundation [Z21B030017]
- K.C.Wong Education Foundation [GJTD-2019-13]
- Ningbo major special projects of the Plan Science and Technology Innovation 2025 [2018B10056, 2019B10046]
- Ningbo 3315 Program
The NiFe-based electrocatalyst composite film prepared by spray pyrolysis demonstrates excellent performance in oxygen evolution, offering a potential solution to the kinetic limitations in photoelectrochemical systems.
The retarded kinetics of oxygen evolution on electrodes is a bottleneck for electrochemical energy conversion and storage systems. NiFe-based electrocatalysts provide a cost-effective choice to confront this challenge. However, there is a lack of facile techniques for depositing compact catalytic films of high coverage and possessing a state-of-the-art performance, which is especially desired in photoelectrochemical (PEC) systems. Herein, we demonstrate a spray pyrolysis (SP) route to address this issue, featuring the kinetic selective preparation towards the desired catalytic-active material. Differing from reported SP protocols which only produce inactive oxides, this approach directly generates a unique composite film consisting of NiFe layered oxyhydroxides and amorphous oxides, exhibiting an overpotential as small as 255 mV (10 mA cm(-2)) and a turnover frequency of similar to 0.4 s(-1) per metal atom. By using such a facile protocol, the surface rate-limiting issue of BiVO4 photoanodes can be effectively resolved, resulting in a charge injection efficiency of over 90%. Considering this deposition directly start from simple nitrates but only takes several seconds to complete, we believe it can be developed as a widely applicable and welcomed functionalization technique for diverse electrochemical devices. (C) 2021 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.
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