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| 1 | Efficient bifunctional catalysts of CoSe/N-doped carbon nanospheres supported Pt nanoparticles for methanol electrolysis of hydrogen generation显示文摘Methanol electrolysis is significant but challenging as an energy-saving technique for electrochemical hydrogen production.Herein,we demonstrated a novel and efficient bifunctional catalyst of CoSe/N-doped carbon nanospheres supported Pt nanoparticles for hydrogen generation via methanol electrolysis;high catalytic performance for both methanol oxidation(MOR)and hydrogen evolution(HER)was observed benefitting from the effective interaction of metal and support effect as well as the oxophilic characteristics of cobalt selenide.Theoretical calculation disclosed the increased charge density of Pt induced by the CoSe/NC support has a bifunctional ability for optimizing the H*adsorption energy for hydrogen evolution reaction and weakening the CO adsorption energy of methanol oxidation reaction.Specifically,the largely improved CO-tolerance ability was observed in the CO-stripping technique,where about 90 mV less of the peak potential for CO oxidation than that of Pt/C catalyst was observed,resulting from a strong electronic effect as indicated by the spectroscopic analysis.The peak current density of 84.2 mA·cm^(–2) was found for MOR,which was about 3.1 times higher than that of Pt/C;and a low overpotential of 32 mV was required to reach 10 mA·cm^(–2) for HER in 0.5 mol·L^(–1) H_(2)SO_(4) with 1.0 mol·L^(–1) CH3OH.When serviced as both anode and cathode catalyst in a methanol electrolyzer,a low cell potential of 0.67 V to offer 10 mA cm^(-2) was obtained,about 170 mV less than that of Pt/C catalyst;moreover,it was 1.1 V lower than that of water-splitting(1.77 V),indicating a promising energy-saving technique for hydrogen generation.They also showed very good catalytic stability and anti-poisoning ability during the catalysis process.This work would help understand the metal-support interaction for hydrogen generation vis methanol electrolysis. | Yang Zhou Qiaowei Wang Xinlong Tian Ligang Feng | 2022 | Nano Research2022，15，10： | 0 |
| 2 | 质子交换膜燃料电池Pt基氧还原电催化剂性能提高的策略显示文摘铂(Pt)的价格高、储量低,开发优异的Pt基氧还原电催化剂对提高质子交换膜燃料电池(PEMFCs)性能和推动其应用具有十分重要的意义。介绍了Pt基电催化剂活性提高的主要理论,综述了当前电催化剂性能提高的策略,包括电催化剂颗粒尺寸、暴露晶面、晶相和界面对其活性和稳定性的影响,对Pt基电催化剂的发展前景和面临的挑战进行了展望和讨论。 | 吴婧 王海斌 丛媛媛 | 2022 | 化工科技2022，30，1： | 0 |
| 3 | In-situ doping nickel single atoms in two-dimensional MXenes analogue support for room temperature NO_(2) sensing显示文摘MXenes are promising supports for anchoring metal single atoms due to their versatile composition,well-defined nanostructures,and suitable conductivity.However,metal single atoms are usually coordinated with surface terminal groups(-O,-OH,-Cl,etc.)of MXenes via conventional wet-impregnation,resulting in limited electronic structure modification.Through a NiCl2 molten salt etching method,we observed that Ni single atoms could be in-situ doped in the lattice of MXenes analogue TiC_(0.5)N_(0.5) support(denoted as Ni1/TiC0.5N0.5),resulting in much larger charge transfer from Ni atoms to adjacent Ti atoms,and thus increasing the electronic density of these Ti atoms.When used for NO_(2) sensing,Ni_(1)/TiC_(0.5)N_(0.5) exhibited excellent response sensitivity(ultra-low limit of detection~10 ppb),selectivity,and good stability at room temperature.This study provides an effective strategy for producing MXenes analogue supported metal single atoms for potential application in gas sensing. | Weiming Chen Peipei Li Jia Yu Peixin Cui Xiaohu Yu Weiguo Song Changyan Cao | 2022 | Nano Research2022，15，10： | 0 |
| 4 | Interfacial Electronic Modulation of Dual-Monodispersed Pt–Ni_(3)S_(2) as Efficacious Bi-Functional Electrocatalysts for Concurrent H_(2) Evolution and Methanol Selective Oxidation显示文摘Constructing the efficacious and applicable bifunctional electrocatalysts and establishing out the mechanisms of organic electro-oxidation by replacing anodic oxygen evolution reaction(OER) are critical to the development of electrochemicallydriven technologies for efficient hydrogen production and avoid CO_(2) emission. Herein, the hetero-nanocrystals between monodispersed Pt(~ 2 nm) and Ni_(3)S_(2)(~ 9.6 nm) are constructed as active electrocatalysts through interfacial electronic modulation, which exhibit superior bi-functional activities for methanol selective oxidation and H_(2) generation. The experimental and theoretical studies reveal that the asymmetrical charge distribution at Pt–Ni_(3)S_(2) could be modulated by the electronic interaction at the interface of dual-monodispersed heterojunctions, which thus promote the adsorption/desorption of the chemical intermediates at the interface. As a result, the selective conversion from CH_(3)OH to formate is accomplished at very low potentials(1.45 V) to attain 100 m A cm^(-2) with high electronic utilization rate(~ 98%) and without CO_(2) emission. Meanwhile, the Pt–Ni_(3)S_(2) can simultaneously exhibit a broad potential window with outstanding stability and large current densities for hydrogen evolution reaction(HER) at the cathode. Further, the excellent bi-functional performance is also indicated in the coupled methanol oxidation reaction(MOR)//HER reactor by only requiring a cell voltage of 1.60 V to achieve a current density of 50 m A cm^(-2) with good reusability. | Qianqian Zhao Bin Zhao Xin Long Renfei Feng Mohsen Shakouri Alisa Paterson Qunfeng Xiao Yu Zhang Xian‑Zhu Fu Jing‑Li Luo | 2024 | Nano-Micro Letters2024，16，4： | 0 |
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