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Mixing 3d-cations strategy to construct stable high-entropy Bi-pyrochlore oxides with superior near-infrared optical absorption and (photo)electrochemical activity.

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Title: Mixing 3d-cations strategy to construct stable high-entropy Bi-pyrochlore oxides with superior near-infrared optical absorption and (photo)electrochemical activity.
Authors: Sun, Shujie1,2 (AUTHOR) sjsun@xynu.edu.cn, Shen, Junya1 (AUTHOR), Han, Wenle1 (AUTHOR), Liu, Chaowei1 (AUTHOR), Hou, Haoran2 (AUTHOR), Ti, Ruixia3 (AUTHOR), Chen, Wenjin1,2 (AUTHOR), Yin, Xiaofeng1,2 (AUTHOR) yxfeng@xynu.edu.cn
Source: Ceramics International. Jun2026:Part C, Vol. 52 Issue 14, p27156-27168. 13p.
Subjects: Pyrochlore, Infrared absorption, Photoelectrochemistry, Transition metal ions, Oxygen evolution reactions, Oxides, Sol-gel processes
Abstract: Cubic Bi-pyrochlores possess excellently structural stability and compositional flexibility, therefore, utilizing configurational entropy to engineer such single-phase oxides has driven the significant research activity. Herein, single-phase and high-entropy cubic Bi-pyrochlore oxides were constructed by magnetic 3d -cations entropy engineering in a Bi 1.68 MNb 1.32 O 6 O' (M = equimolar 3d -ions) system and successfully synthesized using a modified sol-gel combustion technology. The pyrochlore-type structure and designed stoichiometric ratio were carefully confirmed by utilizing X-ray diffraction and electron microtechniques, and effects of high-entropy engineering on microstructure, optical adsorption and catalytic activity were studied in detail. Significantly, as increasing the entropy-level, evolutions of pyrochlore-phase structure and morphology were clearly observed from big cube-grains with large lattice volume towards relatively smaller polyhedral-crystals with decreased lattice volume. What is more, high-entropy by adopting multi-type 3d -cations not only remain stable up to 1000 °C, but also induce an obvious enhancement of optical absorption from visible-light to near-infrared-light, ascribed to d -orbital energy splitting and localized d-d transitions, thereby achieving a superior near-infrared photoresponse in neutral electrolytes under laser irradiation. For electrocatalysis, such high-entropy pyrochlore-catalysts can also exhibit excellent oxygen evolution reaction activities, with a low overpotential <330 mV and a small Tafel slope <50 mV/dec, even their activities are comparable to the 3d -metal-based catalysts. [ABSTRACT FROM AUTHOR]
Copyright of Ceramics International is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Mixing 3d-cations strategy to construct stable high-entropy Bi-pyrochlore oxides with superior near-infrared optical absorption and (photo)electrochemical activity.
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  Data: &lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Sun%2C+Shujie%22&quot;&gt;Sun, Shujie&lt;/searchLink&gt;&lt;relatesTo&gt;1,2&lt;/relatesTo&gt; (AUTHOR)&lt;i&gt; sjsun@xynu.edu.cn&lt;/i&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Shen%2C+Junya%22&quot;&gt;Shen, Junya&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Han%2C+Wenle%22&quot;&gt;Han, Wenle&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Liu%2C+Chaowei%22&quot;&gt;Liu, Chaowei&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Hou%2C+Haoran%22&quot;&gt;Hou, Haoran&lt;/searchLink&gt;&lt;relatesTo&gt;2&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Ti%2C+Ruixia%22&quot;&gt;Ti, Ruixia&lt;/searchLink&gt;&lt;relatesTo&gt;3&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Chen%2C+Wenjin%22&quot;&gt;Chen, Wenjin&lt;/searchLink&gt;&lt;relatesTo&gt;1,2&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Yin%2C+Xiaofeng%22&quot;&gt;Yin, Xiaofeng&lt;/searchLink&gt;&lt;relatesTo&gt;1,2&lt;/relatesTo&gt; (AUTHOR)&lt;i&gt; yxfeng@xynu.edu.cn&lt;/i&gt;
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  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22Ceramics+International%22&quot;&gt;Ceramics International&lt;/searchLink&gt;. Jun2026:Part C, Vol. 52 Issue 14, p27156-27168. 13p.
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  Data: Cubic Bi-pyrochlores possess excellently structural stability and compositional flexibility, therefore, utilizing configurational entropy to engineer such single-phase oxides has driven the significant research activity. Herein, single-phase and high-entropy cubic Bi-pyrochlore oxides were constructed by magnetic 3d -cations entropy engineering in a Bi 1.68 MNb 1.32 O 6 O&#39; (M = equimolar 3d -ions) system and successfully synthesized using a modified sol-gel combustion technology. The pyrochlore-type structure and designed stoichiometric ratio were carefully confirmed by utilizing X-ray diffraction and electron microtechniques, and effects of high-entropy engineering on microstructure, optical adsorption and catalytic activity were studied in detail. Significantly, as increasing the entropy-level, evolutions of pyrochlore-phase structure and morphology were clearly observed from big cube-grains with large lattice volume towards relatively smaller polyhedral-crystals with decreased lattice volume. What is more, high-entropy by adopting multi-type 3d -cations not only remain stable up to 1000 &#176;C, but also induce an obvious enhancement of optical absorption from visible-light to near-infrared-light, ascribed to d -orbital energy splitting and localized d-d transitions, thereby achieving a superior near-infrared photoresponse in neutral electrolytes under laser irradiation. For electrocatalysis, such high-entropy pyrochlore-catalysts can also exhibit excellent oxygen evolution reaction activities, with a low overpotential &lt;330 mV and a small Tafel slope &lt;50 mV/dec, even their activities are comparable to the 3d -metal-based catalysts. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: &lt;i&gt;Copyright of Ceramics International is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1016/j.ceramint.2026.04.264
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        Text: English
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        PageCount: 13
        StartPage: 27156
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      – SubjectFull: Pyrochlore
        Type: general
      – SubjectFull: Infrared absorption
        Type: general
      – SubjectFull: Photoelectrochemistry
        Type: general
      – SubjectFull: Transition metal ions
        Type: general
      – SubjectFull: Oxygen evolution reactions
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      – SubjectFull: Oxides
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      – SubjectFull: Sol-gel processes
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      – TitleFull: Mixing 3d-cations strategy to construct stable high-entropy Bi-pyrochlore oxides with superior near-infrared optical absorption and (photo)electrochemical activity.
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              Text: Jun2026:Part C
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