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Sun Y, Lee J, Kwon NH, Lim J, Jin X, Gogotsi Y, Hwang SJ. Enhancing Hydrogen Evolution Reaction Activity of Palladium Catalyst by Immobilization on MXene Nanosheets. ACS Nano 2024; 18:6243-6255. [PMID: 38345597 DOI: 10.1021/acsnano.3c09640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/28/2024]
Abstract
Efficient catalysts with minimal content of catalytically active noble metals are essential for the transition to the clean hydrogen economy. Catalyst supports that can immobilize and stabilize catalytic nanoparticles and facilitate the supply of electrons and reactants to the catalysts are needed. Being hydrophilic and more conductive compared with carbons, MXenes have shown promise as catalyst supports. However, the controlled assembly of their 2D sheets creates a challenge. This study established a lattice engineering approach to regulate the assembly of exfoliated Ti3C2Tx MXene nanosheets with guest cations of various sizes. The enlargement of guest cations led to a decreased interlayer interaction of MXene lamellae and increased surface accessibility, allowing intercalation of Pd nanoparticles. Stabilization of Pd nanoparticles between interlayer-expanded MXene nanosheets improved their electrocatalytic activity. The Pd-immobilized K+-intercalated MXene nanosheets (PdKMX) demonstrated exceptional electrocatalytic performance for the hydrogen evolution reaction with the lowest overpotential of 72 mV (@10 mA cm-2) and the highest turnover frequency of 1.122 s-1 (@ an overpotential of 100 mV), which were superior to those of the state-of-the-art Pd nanoparticle-based electrocatalysts. Weakening of the interlayer interaction during self-assembly with K+ ions led to fewer layers in lamellae and expansion of the MXene in the c direction during Pd anchoring, providing numerous surface-active sites and promoting mass transport. In situ spectroscopic analysis suggests that the effective interfacial electron injection from the Pd nanoparticles strongly immobilized on interlayer-expanded PdKMX may be responsible for the improved electrocatalytic performance.
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Affiliation(s)
- Yiyang Sun
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
| | - Jihyeong Lee
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
| | - Nam Hee Kwon
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
| | - Joohyun Lim
- Department of Chemistry, Institute for Molecular Science and Fusion Technology, Multidimensional Genomics Research Center, Kangwon National University, Chuncheon, Gangwon 24341, Republic of Korea
| | - Xiaoyan Jin
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
| | - Yury Gogotsi
- A. J. Drexel Nanomaterials Institute, and Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States
| | - Seong-Ju Hwang
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
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Liu Q, Peng Y, Masood Z, DuBois D, Tressel J, Nichols F, Ashby P, Mercado R, Assafa T, Pan D, Kuo HL, Lu JQ, Bridges F, Millhauser G, Ge Q, Chen S. Stable Cuprous Hydroxide Nanostructures by Organic Ligand Functionalization. Adv Mater 2023; 35:e2208665. [PMID: 36462218 PMCID: PMC9975062 DOI: 10.1002/adma.202208665] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Revised: 11/19/2022] [Indexed: 06/17/2023]
Abstract
Copper compounds have been extensively investigated for diverse applications. However, studies of cuprous hydroxide (CuOH) have been scarce due to structural metastability. Herein, a facile, wet-chemistry procedure is reported for the preparation of stable CuOH nanostructures via deliberate functionalization with select organic ligands, such as acetylene and mercapto derivatives. The resulting nanostructures are found to exhibit a nanoribbon morphology consisting of small nanocrystals embedded within a largely amorphous nanosheet-like scaffold. The acetylene derivatives are found to anchor onto the CuOH forming CuC linkages, whereas CuS interfacial bonds are formed with the mercapto ligands. Effective electronic coupling occurs at the ligand-core interface in the former, in contrast to mostly non-conjugated interfacial bonds in the latter, as manifested in spectroscopic measurements and confirmed in theoretical studies based on first principles calculations. Notably, the acetylene-capped CuOH nanostructures exhibit markedly enhanced photodynamic activity in the inhibition of bacteria growth, as compared to the mercapto-capped counterparts due to a reduced material bandgap and effective photocatalytic generation of reactive oxygen species. Results from this study demonstrate that deliberate structural engineering with select organic ligands is an effective strategy in the stabilization and functionalization of CuOH nanostructures, a critical first step in exploring their diverse applications.
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Affiliation(s)
- Qiming Liu
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064
| | - Yi Peng
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064
| | - Zaheer Masood
- School of Chemical and Biomolecular Sciences, Southern Illinois University, Carbondale, Illinois 62901
| | - Davida DuBois
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064
| | - John Tressel
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064
| | - Forrest Nichols
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064
| | - Paul Ashby
- Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720
| | - Rene Mercado
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064
| | - Tufa Assafa
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064
| | - Dingjie Pan
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064
| | - Han-Lin Kuo
- School of Engineering, University of California, 5200 North Lake Road, Merced, California 95343
| | - Jennifer Q. Lu
- School of Engineering, University of California, 5200 North Lake Road, Merced, California 95343
| | - Frank Bridges
- Department of Physics, University of California, 1156 High Street, Santa Cruz, California 95064
| | - Glenn Millhauser
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064
| | - Qingfeng Ge
- School of Chemical and Biomolecular Sciences, Southern Illinois University, Carbondale, Illinois 62901
| | - Shaowei Chen
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064
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