Article
Chemistry, Physical
Benjamin D. Groff, James M. Mayer
Summary: This study demonstrates the generality of molecular scaling relationships in achieving faster catalysis at lower overpotentials. By independently controlling the characteristics of the catalyst and the buffer solution, both the maximum turnover frequency and the effective overpotential have been improved. The most optimal system is achieved with the most reducing catalyst and a weak buffered acid, which may seem counterintuitive.
Article
Chemistry, Applied
Hui Gao, Gong Zhang, Dongfang Cheng, Yongtao Wang, Jing Zhao, Xiaozhi Li, Xiaowei Du, Zhi-Jian Zhao, Tuo Wang, Peng Zhang, Jinlong Gong
Summary: Electrochemical CO2 reduction is a sustainable method for producing multicarbon alcohols. In this study, a Cu electrocatalyst with abundant step sites was designed to suppress the deoxygenation of *CH2CHO and promote alcohol production. The results showed high Faradic efficiency and partial current density for alcohols, as well as a high ratio of alcohols to ethylene in the products. In-situ infrared spectrum characterizations and theoretical calculations revealed that the step sites facilitate C-C coupling and inhibit the cleavage of the C-O bond in *CH2CHO, leading to increased alcohol formation.
CHINESE JOURNAL OF CATALYSIS
(2023)
Article
Chemistry, Physical
Zhongjie Yang, Yang Gao, Lulu Zuo, Chang Long, Caoyu Yang, Xiaofei Zhang
Summary: A diatomic hetero-cyclization strategy was employed to construct efficient 2e-ORR catalysts based on poly-benzimidazole, poly-benzoxazole, and poly-benzothiazole. The sulfuration of poly-benzothiazole resulted in higher H2O2 selectivity and electrochemical durability, achieving one of the highest values for PBXs as 2e-ORR catalysts.
Article
Chemistry, Multidisciplinary
Fekadu Tsegaye Dajan, Marshet Getaye Sendeku, Binglan Wu, Ning Gao, Eyaya Fekadie Anley, Jing Tai, Xueying Zhan, Zhenxing Wang, Fengmei Wang, Jun He
Summary: In this work, researchers introduced Ce atom into the amorphous iron oxyhydroxide nanosheet to improve the electrocatalytic activity and stability for oxygen evolution reaction (OER). The CeFeOxHy electrode showed low overpotential and small Tafel slope at a current density of 100 mA cm(-2), and it can work continuously for over 300 hours. This study provides a design strategy for highly active, low-cost, and durable materials by interfacing high valent metals with earth-abundant oxides/hydroxides.
Review
Chemistry, Physical
Tobias Binninger, Piotr M. Kowalski, Michael H. Eikerling
Summary: This review provides an overview of recent progress in OER electrocatalysis, with a specific focus on computational studies that explicitly considered the elementary step of O2 desorption. It highlights the computational and methodological complexities that led to the neglect of this step in previous studies.
CURRENT OPINION IN ELECTROCHEMISTRY
(2023)
Article
Chemistry, Physical
Jiawei Du, Shuaihu Jiang, Ruya Zhang, Pai Wang, Chao Ma, Ruijuan Zhao, Chunhua Cui, Yanning Zhang, Yijin Kang
Summary: Electrochemical production of H2O2 via 2e- ORR using Pd with Cu electrodeposition as model material shows promising potential in terms of safety, efficiency, and decentralization. The introduction of Cu promotes the production of H2O2 by stabilizing Pd-O and improving 2e- ORR activity according to spectroscopic analysis and computation. PdCu nanowire synthesis demonstrates high selectivity and production rate towards H2O2.
Article
Electrochemistry
Kai S. Exner
Summary: This paper compares three descriptors for approximating electrocatalytic activity and emphasizes the simplicity of assessing activity through a single free-energy change. These descriptors include thermodynamic overpotential, electrochemical-step symmetry index, and overpotential-dependent activity descriptor for multiple-electron processes.
ELECTROCHIMICA ACTA
(2021)
Article
Chemistry, Multidisciplinary
Hui-Qi Xie, Xuan Zheng, Qing-Yun Feng, Xiao-Ping Chen, Ze-Hua Zou, Qing-Xiang Wang, Jing Tang, Yi Li, Yun Ling
Summary: This study successfully synthesized Fe-based oxide composite nanoparticles with stable chemical states. The catalyst exhibited remarkable activity and selectivity in the nitrogen reduction reaction, with high faradaic efficiency and ammonia yield. Experimental characterization and theoretical calculations revealed the excellent charge transfer capability and the suppression of the competitive HER process by the catalyst.
Article
Chemistry, Physical
Da Huo, Fangfang Song, Jianguo Hu, Junhua Yuan, Li Niu, Ai-jun Wang
Summary: The study synthesized mesoporous carbon-coated nickel phosphide nanoparticles with excellent catalytic activity towards oxygen reduction and evolution reactions, showing high stability. This work provides a new avenue for the design of bifunctional catalysts with superior OER/ORR activity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Hao Zhang, Peng Li, Haochen Zhou, Jiamin Xu, Qianfan Jiang, Joseph H. L. Hadden, Yanying Wang, Mengnan Wang, Shengli Chen, Fang Xie, Jason Riley
Summary: In this study, a dual-functional catalyst based on hematite was developed for both EC and PEC water oxidation in alkaline media. The catalyst exhibited excellent activity and stability on both EC and PEC, and showed superior electrocatalytic performance for OER. The addition of gold nanoparticles on the hematite improved the adsorption strength of oxygen-containing intermediates and increased the OER activity.
Article
Chemistry, Physical
Chunyu Zhang, Guozhu Liu, Quanfu Long, Chan Wu, Li Wang
Summary: This study demonstrates the promising performance of oxygen-doped porous carbon materials for the electrochemical two-electron oxygen reduction reaction (2e(-) ORR). The authors prepared oxygen-functionalized porous carbon materials using different methods and investigated their activity and selectivity in the reaction. The catalyst modified with hydrogen peroxide solution hydrothermal treatment showed the highest catalytic activity and selectivity, as well as good stability.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Physical
Na Cao, Zengxi Wei, Jie Xu, Jun Luo, Anxiang Guan, Abdullah M. Al-Enizi, Jianmin Ma, Gengfeng Zheng
Summary: The study demonstrated the successful development of a bi-metallic Sn-Ti structure in TiO2 for efficient electrocatalytic N-2 fixation, highlighting the potential of atomic-scale designing and constructing bimetallic active sites.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Multidisciplinary Sciences
Graham Smith, Edmund J. F. Dickinson
Summary: The authors present a metrology-led perspective on the best practices for electrochemical characterization of materials used in electrochemical energy technologies. These experiments are highly sensitive and the quality of their results is often uncertain and difficult to reproduce quantitatively.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Zhiping Deng, Xiaolei Wang
Summary: The carbon-based catalyst of HMCS exhibits high efficiency in selective oxygen reduction to H2O2, with high onset potential and half-wave potential as well as excellent H2O2 selectivity and electrochemical stability, making it a state-of-the-art catalyst for electrochemical H2O2 production. The outstanding performance is attributed to a combination of factors such as porous structure, large surface area, and proper distribution of oxygen-containing functional groups modification on the surface.
Article
Engineering, Environmental
Zhenzhen Xu, Yuan Tao, Zhaodi Sun, Peiyan Bi, Xing Zhong, Jiajun Liao, Dacheng Hao, Licheng Yang, Lin Xu, Mingbiao Luo, Kecheng Pan, Zhi Gao
Summary: This study focuses on the ligand-engineering strategy to optimize the electronic structure of Ni-MOFs by incorporating electron-rich ferrocene unit. The resulting Ni-MIL-53-Fc shows significantly enhanced electrochemical oxygen evolution reaction (OER) activity compared to Ni-MIL-53-NH2, with a 6.6-fold improvement in TOF value at an overpotential of 350 mV. Characterizations further confirm that the introduction of Fc unit enhances charge transfer, leading to more electrons aggregated in the Ni active sites and improving the intrinsic OER activity of Ni sites. This ligand-engineering strategy can be extended to fabricate highly active and stable catalysts for other electrocatalytic reactions.
CHEMICAL ENGINEERING JOURNAL
(2023)