Article
Chemistry, Physical
R. G. Morais, N. Rey-Raap, J. L. Figueiredo, M. F. R. Pereira
Summary: Carbon nanotubes were modified with cobalt and/or iron phthalocyanines to enhance oxygen reduction and evolution reactions. Increasing FePc content improved electroactivity towards oxygen reduction, while a 1:1 CoPc:FePc mass ratio showed the highest electroactivity for oxygen evolution. These materials have potential as substitutes for noble metal electrocatalysts.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Pengxiang Zhang, Shuling Liu, Jingjing Zhou, Limin Zhou, Baojun Li, Shuqi Li, Xianli Wu, Yu Chen, Xin Li, Xia Sheng, Yanyan Liu, Jianchun Jiang
Summary: The Co doping of FeP is used to modify the d-band center of Fe. Optimized Fe sites accelerate the proton coupling of ORR on N-doped wood-derived carbon, while in situ generated Fe sites optimize the adsorption of OER intermediates on CoFeP nanoparticles. This carbon-based transition metal-phosphide catalyst exhibits unprecedented catalytic activity.
Article
Nanoscience & Nanotechnology
Zhi-Hui Xing, Wen-Long Wang, Xin-Zheng Li, Kai Zhang, Lin Gan, Qian-Yuan Wu
Summary: In this study, carbon nanotubes with single-atom Co-NX active sites, Co-NPs outside the tube, and Co-NPs wrapped in the tube were synthesized by the complexation-pyrolysis synthesis method, and the role of particles and Co-NX sites was explored. The catalyst synthesized with the new stratagem showed outstanding selectivity and ORR activity, and a natural air diffusion electrode fabricated using this material could produce H2O2 under neutral conditions without oxygen aeration.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Hong Li, Xinxin Shu, Haolong Xi, Zhengxing Lv, He Tian, Jintao Zhang, Haibing Xia
Summary: Fe-Cu diatomic nanoclusters with sizes of 0.5-2.5 nm were prepared by chelation interaction and doping interaction. They were proposed as a new type of active site for oxygen reduction reaction (ORR). The as-prepared catalysts showed enhanced electrocatalytic performance and better stability compared to commercial Pt/C catalysts.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Chemistry, Multidisciplinary
Akmal Kosimov, Gulnara Yusibova, Jaan Aruvali, Paarn Paiste, Maike Kaarik, Jaan Leis, Arvo Kikas, Vambola Kisand, Krisjanis Smits, Nadezda Kongi
Summary: This study introduces a novel solid-phase-based methodology for the mechanosynthesis of M-N-C-type catalysts, which is low-cost, time and energy-efficient, and environmentally friendly. The resulting catalysts exhibit excellent bifunctional activity and provide a new avenue for the large-scale production of high-performance and low-cost M-N-C materials.
Article
Chemistry, Physical
Jin Lin, Yuhong Du, Guangping Wu, Chao Wang, Li Guo, Yanzhong Wang
Summary: In this study, hierarchically porous Fe/N co-doped porous carbon on N-doped carbon nanotubes (Fe/N-C@NCNTs) were prepared by the pyrolysis of Fe-doped ZIF-8 embedded on polypyrrole nanotubes (PNTs). The Fe/N-C@NCNTs electrocatalyst exhibited excellent oxygen reduction performance with a limit current density of 5.7 mA cm-2 and a half-wave potential of 0.84 V (vs. RHE). The electrocatalytic activity was only reduced by 7% after a stability test of 650 minutes. This outstanding performance was attributed to the synergistic effects of abundant Fe-Nx-C active sites, high graphitization degree, and hierarchically porous structure.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Sitian Guo, Jue Hu, Shanxiong Luo, Yantong Zhang, Zihan Zhang, Peng Dong, Xiaoyuan Zeng, Mingli Xu, Lina Han, Jianliang Yuan, Chengxu Zhang, Yingjie Zhang
Summary: Fe-Nx catalysts have gained widespread attention for their excellent catalytic performance and the incorporation of two or more metals can significantly enhance catalytic activity. The synthesized Fe and Zr bimetal-doped carbon-based catalyst shows superior ORR electrocatalytic performance, providing a new idea for the preparation of high-performance bimetallic-doped carbon-based electrocatalysts.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Materials Science, Multidisciplinary
Peng Yin, Ming-Xi Chen, Ming Zuo, Le-Le Zhang, Hai-Wei Liang
Summary: Atomically ordered intermetallic compounds (IMCs) have been synthesized with average particle sizes of < 4 nm by a general synthesis strategy based on the strong chemical interaction between metal and sulfur. These Rh-based IMC catalysts showed enhanced catalytic performance for nitroarene hydrogenation, highlighting the advantages of atomically order structure of IMCs for the chemoselective molecular recognition of nitro groups through geometric and electronic effects.
ACS MATERIALS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Peng Yin, Ming-Xi Chen, Ming Zuo, Le-Le Zhang, Hai-Wei Liang
Summary: Atomically ordered intermetallic compounds (IMCs) have unique electronic and geometric features that have sparked continuous research interest in catalysis. A general synthesis strategy has been developed to prepare a family of 10 different Rh-based IMCs with average particle sizes of <4 nm, which show enhanced catalytic performance for nitroarene hydrogenation. The atomically ordered structure of IMCs demonstrates advantages in chemoselective molecular recognition of nitro groups through geometric and electronic effects.
ACS MATERIALS LETTERS
(2022)
Article
Engineering, Environmental
Xupo Liu, Yunpeng Liu, Cuicui Zhang, Ye Chen, Guanyu Luo, Zhitao Wang, Deli Wang, Shuyan Gao
Summary: Regulating pore architecture and electronic structure is important for enhancing the oxygen electrocatalytic activity of M-N-C catalysts. In this study, N, S co-doped hollow carbon nanocages confined Fe, Co bimetallic sites (FeCo-NS-HNCs) were fabricated through a surface bridging strategy. The synergy between metal sites and N, S co-doping improved the adsorption/desorption characteristics of M-Nx sites and the Kirkendall effect facilitated the construction of hollow carbon nanocages, leading to excellent bifunctional oxygen electrocatalytic activity of FeCo-NS-HNCs.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Analytical
Swarna P. Mantry, Biswaranjan D. Mohapatra, Rajesh K. Behera, Kumar S. K. Varadwaj
Summary: We investigated the electrochemical activity of transition metal ion doped MnOx@N-graphene hybrid catalysts for oxygen reduction reaction (ORR). The doped catalysts showed significantly improved performance compared to the undoped catalyst. The Fe-doped catalyst exhibited the highest positive shift in onset potential, highest electron transfer number, and lowest peroxide yield. The Co-doped catalyst showed the highest current density, comparable to benchmark Pt/C catalyst.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Nan Li, Minghao Shi, Wei Zhan, Wenjing Shen, Mianmian Wu, Guifang Sun, Qingfei Li, Jiangquan Ma
Summary: Researchers prepared a novel RuSe2/Co-N-C electrocatalyst with uniform distribution of RuSe2 nanospheres on Co-N-C nanosheets and two-electron modulation, significantly improving the performance of the hydrogen evolution reaction.
Article
Chemistry, Multidisciplinary
Xiaorong Lin, Qingqing Li, Yixuan Hu, Zeyu Jin, Kolan Madhav Reddy, Kaikai Li, Xi Lin, Lijie Ci, Hua-Jun Qiu
Summary: Anchoring single metal atom to carbon supports is an effective strategy to enhance catalyst efficiency. Dual-atom catalysts (DACs) have emerged as a promising candidate for atomic catalysts, outperforming single-atom catalysts (SACs). However, understanding the structure and benefits of polynary single-atom catalysts remains a challenge.
Article
Chemistry, Multidisciplinary
Anuj Kumar, Dipak Kumar Das, Raj Kishore Sharma, Manickam Selvaraj, Mohammed A. Assiri, Saira Ajmal, Guoxin Zhang, Ram K. Gupta, Ghulam Yasin
Summary: In this study, density functional theory calculations were used to investigate the activity and mechanism of binuclear phthalocyanine (bN-Pc) models combined with Fe and Co for the oxygen reduction reaction (ORR) in alkaline media. The results showed that Fe-Co-bN-Pc exhibited stronger ORR performance with a lower energy barrier. This research provides a scientific and engineering perspective for the construction of dual-atom active sites in future ORR electrocatalysts.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Chemistry, Physical
Wenxiu Yang, Xiangjian Liu, Huan Lv, Jianbo Jia
Summary: This study successfully synthesized FeP@SA-Fe/HC-900 hybrid catalyst with high oxygen reduction reaction activity, showing superior performance compared to commercial Pt/C catalyst. The research provides a new approach to enhance the electrochemical catalytic performance of carbon composite materials through the synergistic effect of atomic-metal and metal nanoparticles.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
