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34. Supporting Information Unveiling the Role of Counter-Anions in Amorphous Transition Metal-Based Oxygen Evolution Electrocatalysts

Author

Zheng, Renji [zhengrj@csu.edu.cn], Arbiol, Jordi [acabot@irec.cat], Wang, Xiang, Han, Xu, Du, Ruifeng, Liang, Zhifu, Zuo, Yong, Guardia, Pablo, Li, Junshan, Llorca, Jordi, Arbiol, Jordi, Zheng, Renji, Cabot, Andreu, Zheng, Renji [zhengrj@csu.edu.cn], Arbiol, Jordi [acabot@irec.cat], Wang, Xiang, Han, Xu, Du, Ruifeng, Liang, Zhifu, Zuo, Yong, Guardia, Pablo, Li, Junshan, Llorca, Jordi, Arbiol, Jordi, Zheng, Renji, and Cabot, Andreu

Published
2023

36. Controllable Preparation of Zeolite-P/Calcined Diatomite with MgCl2.

Author

Guo, Zhengzheng, Ren, Zijie, Gao, Huimin, Guan, Junfang, Li, Peiyue, Zheng, Renji, Yin, Hang, and Chen, Zhijie

Abstract

Developing highly efficient calcined diatomite (C-D)-based filter aids with excellent adsorption performance is of great significance. Herein, Zeolite-P was successfully synthesized on the surface of C-D through hydrothermal modification with NaOH and MgCl2 as efficient morphology control agents. The optimal Zeolite-P/C-D material perfectly retained the diatomite structure and showed a whiteness of 83.36% and a high specific surface area of 237.47 m2/g, leading to an excellent adsorption capacity for methylene blue trihydrate (MB) of 125.46 mg/g and a good permeability of 0.43 darcy. The porous fibrous microspheres Zeolite-P was synthesized on the surface of C-D under controlled conditions to improve the adsorption performance of Zeolite-P/C-D material. By developing diatomite-based composites for filter aids applications, this study paves the way for the comprehensive and efficient utilization of low-cost diatomite resources. [ABSTRACT FROM AUTHOR]

Published
2024
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42. Dual Lewis Acid‐Base Sites Regulate Silver‐Copper Bimetallic Oxide Nanowires for Highly Selective Photoreduction of Carbon Dioxide to Methane

Author

Deng, Shimao, primary, Wang, Ranhao, additional, Feng, Xuezhen, additional, Zheng, Renji, additional, Gong, Shaokuan, additional, Chen, Xihan, additional, Shangguan, Yangzi, additional, Deng, Lili, additional, Tang, Huan, additional, Dai, Hao, additional, Duan, Lele, additional, Liu, Chengyuan, additional, Pan, Yang, additional, and Chen, Hong, additional

Published
2023
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45. Unveiling the role of counter-anions in amorphous transition metal-based oxygen evolution electrocatalysts

Author

Universitat Politècnica de Catalunya. Departament d'Enginyeria Química, Universitat Politècnica de Catalunya. ENCORE - Energy Catalysis Process Reaction Engineering, Wang, Xiang, Xu, Han, Du, Ruifeng, Liang, Zhifu, Zuo, Yong, Guardia, Pablo, Li, Junshan, Llorca Piqué, Jordi, Arbiol Cobos, Jordi, Zheng, Renji, Cabot, Andreu, Universitat Politècnica de Catalunya. Departament d'Enginyeria Química, Universitat Politècnica de Catalunya. ENCORE - Energy Catalysis Process Reaction Engineering, Wang, Xiang, Xu, Han, Du, Ruifeng, Liang, Zhifu, Zuo, Yong, Guardia, Pablo, Li, Junshan, Llorca Piqué, Jordi, Arbiol Cobos, Jordi, Zheng, Renji, and Cabot, Andreu

Abstract

At the initial stage of the oxygen evolution reaction (OER) most electrocatalysts undergo structural and chemical surface reconstruction. While this reconstruction strongly influences their performance, it is frequently overlooked. Herein, we analyze the role of the oxidized anions, which is particularly neglected in most previous works. We introduce a range of different anionic groups (Cl-, CH3COO-, NO3-, SO42-) on the surface of an amorphous ZnCoxNiyOz catalyst by a facile proton etching and ion exchange method from a ZIF-8 self-sacrificial template. The structural and chemical properties of the obtained set of materials are thoroughly analysed and correlated with their electrocatalytic performance to study the effect of surface anionic groups, phase transition, metal leaching and defect generation on OER activity. Exploiting the control possibilities provided by the synthesis method here described and employing the uncovered property-performance correlations, the electrocatalyst is optimized. As a result, we produce ZnCo1.25Ni0.73Ox-SO4 catalysts with outstanding OER performances, including a low overpotential of 252 mV at 10 mA cm-2 with a small Tafel slope of 41.6 mV dec-1. Furthermore, this catalyst exhibits remarkable stability with negligible overpotential variation for 100 h. The excellent catalytic properties are rationalized using density functional theory calculations, showing that the surface-adsorbed anions, particularly SO42-, can stabilize the OOH* intermediate, thus enhancing the OER activity. This work o¿ers new insight into the roles of metal leaching and surface-adsorbed anions in the OER progress and facilitates the rational design of highly-efficient electrocatalysts for OER., Peer Reviewed, Postprint (author's final draft)

Published
2023

46. Unveiling the role of counter-anions in amorphous transition metal-based oxygen evolution electrocatalysts

Author

Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Ministerio de Economía y Competitividad (España), European Commission, China Scholarship Council, Generalitat de Catalunya, Sichuan Provincial Department of Science and Technology, Ministerio de Ciencia e Innovación (España), Natural Science Foundation of Sichuan Province, Wang, Xiang, Han, Xu, Du, Ruifeng, Liang, Zhifu, Zuo, Yong, Guardia, Pablo, Li, Junshan, Llorca, Jordi, Arbiol, Jordi, Zheng, Renji, Cabot, Andreu, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Ministerio de Economía y Competitividad (España), European Commission, China Scholarship Council, Generalitat de Catalunya, Sichuan Provincial Department of Science and Technology, Ministerio de Ciencia e Innovación (España), Natural Science Foundation of Sichuan Province, Wang, Xiang, Han, Xu, Du, Ruifeng, Liang, Zhifu, Zuo, Yong, Guardia, Pablo, Li, Junshan, Llorca, Jordi, Arbiol, Jordi, Zheng, Renji, and Cabot, Andreu

Abstract

At the initial stage of the oxygen evolution reaction (OER) most electrocatalysts undergo structural and chemical surface reconstruction. While this reconstruction strongly influences their performance, it is frequently overlooked. Herein, we analyze the role of the oxidized anions, which is particularly neglected in most previous works. We introduce a range of different anionic groups (Cl-, CH3COO-, NO3-, SO42-) on the surface of an amorphous ZnCoxNiyOz catalyst by a facile proton etching and ion exchange method from a ZIF-8 self-sacrificial template. The structural and chemical properties of the obtained set of materials are thoroughly analysed and correlated with their electrocatalytic performance to study the effect of surface anionic groups, phase transition, metal leaching and defect generation on OER activity. Exploiting the control possibilities provided by the synthesis method here described and employing the uncovered property-performance correlations, the electrocatalyst is optimized. As a result, we produce ZnCo1.25Ni0.73Ox-SO4 catalysts with outstanding OER performances, including a low overpotential of 252 mV at 10 mA cm−2 with a small Tafel slope of 41.6 mV dec−1. Furthermore, this catalyst exhibits remarkable stability with negligible overpotential variation for 100 h. The excellent catalytic properties are rationalized using density functional theory calculations, showing that the surface-adsorbed anions, particularly SO42−, can stabilize the OOH* intermediate, thus enhancing the OER activity. This work offers new insight into the roles of metal leaching and surface-adsorbed anions in the OER progress and facilitates the rational design of highly-efficient electrocatalysts for OER.

Published
2023

48. “Soil for Soil Remediation” Strategy Driven on Converting Natural Soils into Fe2O3-CAN-Type Zeolite Composites for Dual Ionic Heavy Metal-Contaminated Soil Remediation: Universality, Synergistic Effects, and Mechanism

Author

Yang, Dazhong, primary, Ge, Qiuyue, additional, Feng, Xuezhen, additional, Wang, Ranhao, additional, Li, Shangying, additional, Wei, Wenfei, additional, Zheng, Renji, additional, Zhang, Juan, additional, and Chen, Hong, additional

Published
2023
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