DataVXACS Materials LettersPaper
journal article·2023-11-06

Stabilizing Sub-2-nm CuIr Nanoalloys with Cucurbit[6]uril for Oxygen Evolution Reaction in Strong Acid

Hanhui You, Yuanyuan Wang, Fanfei Sun, Minna Cao, Rong Cao, Dongshuang Wu

ACS Materials Letters· Volume 5· Issue 11
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Source abstract

Abstract

Designing applicable high activity over long-term operation Ir-based alloy oxygen evolution reaction (OER) catalysts plays an important role in the development of the water-splitting process under acidic conditions. Herein, we report that cucurbit[6]uril-supported copper–iridium alloy (CB[6]-CuIr) hybrid with the enhancement of activity and stability for OER. The CB[6]-Cu 0.33 Ir 0.67 shows a current density of 11.68 mA/cm 2, which is 8.4 times greater than that of Ir black at η = 280 mV. CB[6]-Cu 0.33 Ir 0.67 exhibits superior stability without activity loss after 10 h of continuous operation at 10 mA/cm 2, while the CuIr alloy stabilized by carbon or polyvinylpyrrolidone is deactivated within 1 and 4 h, respectively. X-ray absorption fine structure (XAFS) and electron energy loss spectroscopy (EELS) confirm the interaction between the Cu 0.33 Ir 0.67 alloy and CB[6] that can avoid the formation of dissoluble CuIr oxides. This is the first report on using CB[6] to make binary nanoalloys, providing insights into the application of the supramolecules in functionalizing nanomaterials.
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Research context

Metals & alloysNanomaterialsCatalysis & surfaces

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

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

Affiliations

State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, People’s Republic of China

University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China

School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798

Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, People’s Republic of China

Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou 350108, People’s Republic of China

Funding

National Key Research and Development Program of China · Ministry of Education - Singapore · Natural Science Foundation of Fujian Province · Fujian Science and Technology Innovation Laboratory for Optoelectronic Information of China · National Natural Science Foundation of China · Nanyang Technological University

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