1
|
Shudin NH, Eguchi R, Fujita T, Tokunaga T, Hashimoto A, Abe H. Phase textures of metal-oxide nanocomposites self-orchestrated by atomic diffusions through precursor alloys. Phys Chem Chem Phys 2024; 26:14103-14107. [PMID: 38695831 DOI: 10.1039/d3cp05157a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2024]
Abstract
Metal-oxide nanocomposites (MONs) are of pivotal importance as electrode materials, yet lack a guiding principle to tune their phase texture. Here we report that the phase texture of MONs can be tuned at the nanoscale by controlling the nanophase separation of precursor alloys. In situ transmission electron microscopy (in situ TEM) has demonstrated that a MON material of platinum (Pt) and cerium oxide (CeO2) is obtained through promoted nanophase separation of a Pt5Ce precursor alloy in an atmosphere containing oxygen (O2) and carbon monoxide (CO). The Pt-CeO2 MON material comprised an alternating stack of nanometre-thick layers of Pt and CeO2 in different phase textures ranging from lamellae to mazes, depending on the O2 fraction in the atmosphere. Mathematical simulations have demonstrated that the phase texture of MONs originates from a balance in the atomic diffusions across the alloy precursor, which is controllable by the O2 fraction, temperature, and composition of the precursor alloys.
Collapse
Affiliation(s)
- Nasrat Hannah Shudin
- National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-00443, Japan.
- Graduate School of Science and Engineering, Saitama University, Shimo-Okubo 255, Saitama 338-8570, Japan
| | - Ryuto Eguchi
- National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-00443, Japan.
- Tsukuba University, 1-chome-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | | | - Tomoharu Tokunaga
- Institute of Materials and Systems for Sustainability, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
| | - Ayako Hashimoto
- National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-00443, Japan.
- Tsukuba University, 1-chome-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Hideki Abe
- National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-00443, Japan.
- Graduate School of Science and Engineering, Saitama University, Shimo-Okubo 255, Saitama 338-8570, Japan
| |
Collapse
|
2
|
Baig SM, Ishii S, Abe H. Sub-50 nm patterning of alloy thin films via nanophase separation for hydrogen gas sensing. NANOSCALE ADVANCES 2024; 6:2582-2585. [PMID: 38752141 PMCID: PMC11093267 DOI: 10.1039/d4na00071d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/25/2024] [Accepted: 04/10/2024] [Indexed: 05/18/2024]
Abstract
A novel patterning method achieves two-dimensional nano-patterning of metal nanofibers by depositing a platinum-cerium alloy film on a silicon wafer and inducing phase separation in an oxygen-carbon monoxide atmosphere. The resulting nano-patterned thin film, Pt#CeO2/Si, consists of platinum and cerium oxide with an average pattern width of 50 nm and exhibits potential as a hydrogen sensor with sensitive electrical responses to hydrogen ad/desorption. The patterning method introduced herein addresses the challenge of wavelength limitations in traditional optical lithography, offering a scalable approach for sub-50 nm patterns, which are crucial for advanced sensor and electronic applications.
Collapse
Affiliation(s)
- Sherjeel Mahmood Baig
- National Institute for Materials Science 1-1 Namiki 305-0044 Tsukuba Ibaraki Japan
- Graduate School of Science and Technology, Saitama University 255 Shimookubo Saitama 338-8570 Japan
| | - Satoshi Ishii
- National Institute for Materials Science 1-1 Namiki 305-0044 Tsukuba Ibaraki Japan
| | - Hideki Abe
- National Institute for Materials Science 1-1 Namiki 305-0044 Tsukuba Ibaraki Japan
- Graduate School of Science and Technology, Saitama University 255 Shimookubo Saitama 338-8570 Japan
| |
Collapse
|
3
|
Strijevskaya A, Yamaguchi A, Shoji S, Ueda S, Hashimoto A, Wen Y, Wardhana AC, Lee JE, Liu M, Abe H, Miyauchi M. Nanophase-Separated Copper-Zirconia Composites for Bifunctional Electrochemical CO 2 Conversion to Formic Acid. ACS APPLIED MATERIALS & INTERFACES 2023; 15:23299-23305. [PMID: 37140359 DOI: 10.1021/acsami.3c02874] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
A copper-zirconia composite having an evenly distributed lamellar texture, Cu#ZrO2, was synthesized by promoting nanophase separation of the Cu51Zr14 alloy precursor in a mixture of carbon monoxide (CO) and oxygen (O2). High-resolution electron microscopy revealed that the material consists of interchangeable Cu and t-ZrO2 phases with an average thickness of 5 nm. Cu#ZrO2 exhibited enhanced selectivity toward the generation of formic acid (HCOOH) by electrochemical reduction of carbon dioxide (CO2) in aqueous media at a Faradaic efficiency of 83.5% at -0.9 V versus the reversible hydrogen electrode. In situ Raman spectroscopy has revealed that a bifunctional interplay between the Zr4+ sites and the Cu boundary leads to amended reaction selectivity along with a large number of catalytic sites.
Collapse
Affiliation(s)
- Anna Strijevskaya
- Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Meguro, Tokyo, 152-8552, Japan
- Uzbek-Japan Innovation Center of Youth, Tashkent 100095, Uzbekistan
| | - Akira Yamaguchi
- Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Meguro, Tokyo, 152-8552, Japan
| | - Shusaku Shoji
- Department of Materials Science & Engineering, Cornell University, Ithaca, New York, 14853-1501, United States
| | - Shigenori Ueda
- National Institute for Materials Science, Tsukuba, Ibaraki, 305-0044, Japan
| | - Ayako Hashimoto
- National Institute for Materials Science, Tsukuba, Ibaraki, 305-0044, Japan
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8571, Japan
| | - Yu Wen
- National Institute for Materials Science, Tsukuba, Ibaraki, 305-0044, Japan
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8571, Japan
| | - Aufandra Cakra Wardhana
- Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Meguro, Tokyo, 152-8552, Japan
| | - Ji-Eun Lee
- Biofunctional Catalyst Research Team, RIKEN Center for Sustainable Resource Science, Wako, Saitama, 351-0198, Japan
| | - Min Liu
- Hunan Joint International Research Center for Carbon Dioxide Resource Utilization, School of Physical and Electronics, Central South University, Changsha 410083, Public Republic of China
| | - Hideki Abe
- National Institute for Materials Science, Tsukuba, Ibaraki, 305-0044, Japan
- Graduate School of Science and Technology, Saitama University, Saitama 338-8570, Japan
| | - Masahiro Miyauchi
- Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Meguro, Tokyo, 152-8552, Japan
| |
Collapse
|
4
|
Su Z, Chen T. Porous Noble Metal Electrocatalysts: Synthesis, Performance, and Development. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2021; 17:e2005354. [PMID: 33733551 DOI: 10.1002/smll.202005354] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2020] [Revised: 10/25/2020] [Indexed: 06/12/2023]
Abstract
Active sites (intrinsic activity, quantity, and distribution), electron transfer, and mass diffusion are three important factors affecting the performance of electrocatalysts. Composed of highly active components which are built into various network structures, porous noble metal is an inherently promising electrocatalysts. In recent years, great efforts have been made to explore new efficient synthesis methods and establish structural-performance relationships in the field of porous noble metal electrocatalysis. In this review, the very recent progress in strategies for preparing porous noble metal, including innovation and deeper understanding of traditional methods is summarized. A discussion of relationship between porous noble metal structure and electrocatalytic performance, such as accessibility of active sites, connectivity of skeleton structures, channels dimensions, and hierarchical structures, is provided.
Collapse
Affiliation(s)
- Zhipeng Su
- Institute of New Catalytic Materials Science, School of Materials Science and Engineering, Key Laboratory of Advanced Energy Materials Chemistry (MOE), Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Nankai University, Tianjin, 300350, P. R. China
| | - Tiehong Chen
- Institute of New Catalytic Materials Science, School of Materials Science and Engineering, Key Laboratory of Advanced Energy Materials Chemistry (MOE), Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Nankai University, Tianjin, 300350, P. R. China
| |
Collapse
|