Hierarchical Cu Nanoarray/NiFe Hydroxide Nanostructures for Efficient Electrochemical Water Oxidation

Lu Mao; Xiaoyu Hao; Yu Zhang; Siew Yee Wong; Jiating He; Suxi Wang; Ximeng Liu; Xiaolei Huang; John Wang; Xu Li

doi:10.1021/acsanm.3c01718

journal article·2023-06-09

Hierarchical Cu Nanoarray/NiFe Hydroxide Nanostructures for Efficient Electrochemical Water Oxidation

Lu Mao, Xiaoyu Hao, Yu Zhang, Siew Yee Wong, Jiating He, Suxi Wang, Ximeng Liu, Xiaolei Huang, John Wang, Xu Li

ACS Applied Nano Materials· Volume 6· Issue 11

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Source abstract

Abstract

Three-dimensional (3D) hierarchical nanostructures have shown great promise for electrocatalysis, while a conductive core is paramount to boost the ultimate catalytic activity. In the present study, hierarchical NiFe hydroxide–Cu arrays are prepared through solution etch and sequential electrolysis as the electrocatalysts for oxygen evolution reaction (OER). The electrochemically reduced Cu nanoarrays as the core provide superior conductivity for electron transfer, while the unique hierarchical 3D structure provides a large active surface area, a short ion diffusion path, and open channels for efficient gas release. The resulting NiFe hydroxide–Cu arrays on copper foam (CF) exhibit outstanding catalytic performance of 245 and 300 mV, respectively, to achieve current densities of 10 and 100 mA cm –2 in a 1 M KOH solution. A small Tafel slope of 51 mV dec –1 and superior electrochemical durability of up to 100 h are also demonstrated.

Source: openalex_inverted_index · Quality: baseline

Research context

Nanomaterials Catalysis & surfaces

OpenAlex topics: Electrocatalysts for Energy Conversion · Advanced battery technologies research · Copper-based nanomaterials and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, Singapore 138634, Singapore

State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials, Northwestern Polytechnical University, Xi’an 710072, Shaanxi, P. R. China

Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, Singapore 138634, Singapore

Department of Materials Science & Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576, Singapore

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