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Fe-N_(x) sites coupled with core-shell FeS@C nanoparticles to boost the oxygen catalysis for rechargeable Zn-air batteries

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Journal of Energy Chemistry 2024年第3期90卷 565-577,I0013页

作者： Katam Srinivas Zhuo chen Anran chen Fei Ma Ming-qiang Zhu yuanfu chen School of Integrated Circuit Science and Engineering and State Key Laboratory of Electronic Thin Films and Integrated DevicesUniversity of Electronic Science and Technology of ChinaChengdu 610054SichuanChina College of Mechanical and Electronic Engineering Northwest A&F UniversityYangling 712100ShaanxiChina School of Materials and Energy Yunnan UniversityKunming 650091YunnanChina

The development of efficient single-atom catalysts(SACs) for the oxygen reduction reaction(ORR)remains a formidable challenge,primarily due to the symmetric charge distribution of metal singleatom sites(M-N_(4)).To address such issue,herein,Fe-N_(x) sites coupled synergistic catalysts fabrication strategy is presented to break the uniform electronic distribution,thus enhancing the intrinsic catalytic ***,atomically dispersed Fe-N_(x) sites supported on N/S-doped mesoporous carbon(NSC)coupled with FeS@C core-shell nanoparticles(FAS-NSC@950) is synthesized by a facile hydrothermal reaction and subsequent *** to the presence of an in situ-grown conductive graphitic layer(shell),the FeS nanoparticles(core) effectively adjust the electronic structure of single-atom Fe sites and facilitate the ORR kinetics via short/long-range coupling ***,FAS-NSC@950displays a more positive half-wave potential(E_(1/2)) of 0.871 V with a significantly boosted ORR kinetics(Tafel slope=52.2 mV dec^(-1)),outpacing the commercial Pt/C(E_(1/2)=0.84 V and Tafel slope=54.6 mV dec^(-1)).As a bifunctional electrocatalyst,it displays a smaller bifunctional activity parameter(ΔE) of 0.673 V,surpassing the Pt/C-RuO_(2) combination(ΔE=0.724 V).Besides,the FAS-NSC@950-based zincair battery(ZAB) displays superior power density,specific capacity,and long-term cycling performance to the Pt/C-Ir/C-based *** work significantly contributes to the field by offering a promising strategy to enhance the catalytic activity of SACs for ORR,with potential implications for energy conversion and storage technologies.

关键词： Fe-N_(x)sites Core-shell FeS@C Synergistic interactions Oxygen reduction reaction Zn-air battery

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Cobalt phosphide nanoparticles supported within network of N-doped carbon nanotubes as a multifunctional and scalable electrocatalyst for water splitting

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Journal of Energy Chemistry 2021年第1期30卷 130-138,I0005页

作者： Dongxu Yang Wenqiang Hou Yingjiong Lu Wanli Zhang yuanfu chen School of Electronic Science and Engineering and State Key Laboratory of Electronic Thin Films and Integrated DevicesUniversity of Electronic Science and Technology of ChinaChengdu 610054SichuanChina Department of Physics School of Scienceand Everest Research InstituteTibet UniversityLhasa 850000Xizang(Tibet)Autonomous RegionChina School of Electronic Science and Engineering Xi’an Jiaotong UniversityXi’an 710049ShaanxiChina

In order to realize industrial production of hydrogen through water splitting,it is essential to develop a cost-efficient and scalable approach to synthesize nonprecious electrocatalysts with sufficiently high activity and stability to replace commercial noble-metal-based *** we synthesize cobalt phosphide nanoparticles dispersed within nitrogen-doped carbon nanotube network(CP@NCNT) via scalable spray drying and thermal *** a multifunctional electrocatalyst,the CP@NCNT hybrid delivers outstanding activity for HER(in both acidic and alkaline electrolytes),OER and overall water ***,it shows an ultra-low overpotental of 94 mV to obtain 10 mA cm-2 in *** also demonstrates outstanding activity in overall water splitting,requiring only 1.619 V to deliver 10 mA cm-2with more than 72 h’ long-term *** combination of notable performance,multi-functionality and highly scalable spray-drying synthesis method enables this material as a novel and cost-efficient transition metal-based electrocatalysts for overall water splitting.

关键词： Obalt phosphides Carbon nanotube Nitrogen doping Large-scale synthesis Overall water splitting

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Surface modification of metal-organic frameworks under sublimated iron-atmosphere by controlled carbonization for boosted oxygen evolution reaction

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Nano Research 2022年第7期15卷 5884-5894页

作者： Katam Srinivas Xin chen Dawei Liu Fei Ma Xiaojuan Zhang Wanli Zhang Hua Lin yuanfu chen School of Electronic Science and Engineering and State Key Laboratory of Electronic Thin Films and Integrated DevicesUniversity of Electronic Science and Technology of ChinaChengdu 610054China School of Materials and Energy Southwest UniversityChongqing 400715China College of Science and Institute of Oxygen SupplyTibet UniversityLhasa 850000China

Development of cost-effective,efficient,and durable electrocatalysts for oxygen evolution reaction(OER)with fast kinetic reaction is highly significant,considering the elevated thermodynamic energy barrier involved in water *** overcome such challenges,an innovative vapor phased iron-doping strategy is employed on carbon nanotubes(CNT)-interlinked metalorganic framework(MOF)nanosheets(Ni-MOF@CNT)to obtain mixed metal oxide and metal heteronanoparticles superficially implanted partially(semi)-decomposed MOF nanosheets(Ni-M@C-400).These semi-MOF nanosheets attain the structural privileges related to MOF-nanostructure,mixed metal nanoparticles synergism,interconnected-CNT assisted high conductivity,and mechanical *** a result,Ni-M@C-400 exhibits exceptional OER activity with overpotential as low as 229 mV to reach the benchmark current density of 10 mA/cm^(2)(η10)and exhibits greatly reduced thermodynamic barrier(Tafel slopes of 40.51 mV/dec)along with significant durability for~60 *** importantly,this sublimated iron-doped semi-MOF(Ni-M@C-400)displays significantly better OER performance over the corresponding annealed bimetallic MOF(NiFe-M@C-400:270 mV atη10).Moreover,the successful incorporation of vapor phased iron into variety of MOFs(Cr,Mn,Co,Ni,and Cu)approved its uniqueness and the *** work provides an innovative vapor phased heteroatom-doping strategy to develop costeffective and efficient electrocatalysts for water electrolysis.

关键词： metal-organic frameworks(MOFs) semi-MOFs controlled carbonization heteronanoparticles oxygen evolution reaction

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N-doped CNTs capped with carbon layer armored CoFe alloy as highly stable bifunctional catalyst for oxygen electrocatalysis

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Nano Research 2022年第5期15卷 3971-3979页

作者： Bin Wang Katam Srinivas Yanfang Liu Dawei Liu Xiaojuan Zhang Wanli Zhang yuanfu chen State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu 610054China College of Science and Institute of Oxygen SupplyTibet UniversityLhasa 850000China

Designing and fabricating the bifunctional electrocatalysts for the oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)has long posed an uphill and pressing task for the interconversion of electricity and *** this in mind,herein,we propose a novel hierarchical nanoarchitecture of N-doped carbon nanotubes capped with carbon layer armored CoFe alloy(CoFe@NC-NT),which is facilely fabricated by spray drying and subsequent annealing *** a bifunctional electrocatalyst,the well-designed CoFe@NC-NT shows a remarkably low overpotential of 257 mV and a half-wave potential of 0.74 V to obtain 10 mA·cm^(-2)in OER and ORR,***,it is also characterized by exceptional operating stability to meet practical application for Zn-air *** high catalytic activity of CoFe@NC-NT is attributed to the tight contact between the highly conductive nanotubes and metal alloy *** the qualified stability is ascribed to the coating effect of carbon layer shell to alloy *** the unique structural evolution with enhanced oxygen-involved reaction activity,we believe that this work can provide an appealing innovative approach towards the directed self-assembly of functional nanostructures to realize satisfying overall performance.

关键词： oxygen electrocatalysis metal alloy coating effect self-assembly Zn-air battery

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Hierarchically porous nanoarchitecture constructed by ultrathin CoSe_(2)embedded Fe-CoO nanosheets as robust electrocatalyst for water oxidation

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Journal of Materials Science & Technology 2021年第19期78卷 229-237页

作者： Manigandan Ramadoss yuanfu chen Yang Hu Bin Wang Ramkumar Jeyagopal Karpuraranjith Marimuthu Xinqiang Wang Dongxu Yang School of Electronic Science and Engineering and State Key Laboratory of Electronic Thin Films and Integrated DevicesUniversity of Electronic Science and Technology of ChinaChengdu610054China School of Science and Institute of Oxygen SupplyTibet UniversityLhasa850000China

The sluggish kinetics and high cost of the noble-metal based electrocatalyst for oxygen evolution reaction(OER)still seriously limits the efficiencies of water ***,for the first time,we rationally design a porous hierarchical nanoarchitecture,constructed by ultrathin CoSe_(2)embedded Fe-CoO nanosheets(CoSe_(2)@Fe-CoO),which is synthesized via self-assembly hydrolysis driven in-situ synergetic selenization of Fe/Co/O/Se precursor followed by Ostwald *** an OER catalyst,the porous CoSe_(2)@Fe-CoO hybrid with abundant CoOOH electroactive sites delivers a small Tafel of 56.2 m V/dec with very low onset overpotential of 280 m V@10 m A/cm~2and excellent long-term physicochemical stability till 62h without obvious decay,which outperforms well-established benchmark electrocatalysts(RuO_(2)).The boosted OER performance of CoSe_(2)@Fe-CoO nanosheets is mainly attributed to its iron-doping effect,porous nanoarchitecture,and multicomponent synergetic/interfacial effect between ultrathin cobalt(II)oxide and conductive cobalt selenide(CoSe_(2))*** work presents a facile construction strategy to find a nonprecious hybrid OER electrocatalyst with excellent performance and long-term stability.

关键词： Co Se_(2)@Fe-CoO electrocatalyst Self-assembly hydrolysis Ultrathin nanoframeworks Oxygen evolution reaction In-situ selenization

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MoP QDs@graphene as highly efficient electrocatalyst for polysulfide conversion in Li-S batteries

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Journal of Materials Science & Technology 2021年第31期90卷 37-44页

作者： Bo Yu Fei Ma Dongjiang chen Katam Srinivas Xiaojuan Zhang Xinqiang Wang Bin Wang Wanli Zhang Zegao Wang Weidong He yuanfu chen School of Electronic Science and Engineering and State Key Laboratory of Electronic Thin Films and Integrated DevicesUniversity of Electronic Science and Technology of ChinaChengdu 610054PR China School of Physics University of Electronic Science and Technology of ChinaChengdu 611731PR China School of Science and Institute of Oxygen SupplyTibet UniversityLhasa 850000PR China College of Materials Science and Engineering Sichuan UniversityChengdu 610065PR China

The shuttle effect of lithium polysulfides(LiPSs)and sluggish redox conversion significantly hinder practical implementation of lithium-sulfur batteries(LSBs).To overcome these issues,herein,we present MoP quantum dots anchored N,P-doped graphene(MPQ@G)as a multifunctional LSB *** N,P-doped graphene layers serve as a conductive skeleton to support the MoP QDs which can accelerate the electron transfer,physically hinder the polysulfide migration and thus enhance the electrochemical *** importantly,as a polar and conductive catalyst,MoP QDs provide catalytically active sites for the conversion of *** a result,the LSBs with MPQ@G/S cathodes deliver an elevated initial capacity of 1220.2 mAh g~(-1)at 0.2 C and remain 98.9%after rate cycles,signifying its exceptional cycling ***,it displays a large capacity of 681.2 mAh g~(-1)even at a high rate of 1 *** Li-S pouch cell also presents high specific capacities and preeminent cycling stabilities,confirming its great potential for high-rate *** functional theory calculations demonstrate the improved absorptivity and redox conversion reversibility of *** work provides an efficient strategy to improve composite with highly adsorptive and catalytic properties for high-performance Li-S batteries.

关键词： MoP quantum dots Graphene Electrocatalyst Shuttle effect Li-S batteries

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A co-coordination strategy to realize janus-type bimetallic phosphide as highly efficient and durable bifunctional catalyst for water splitting

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Journal of Materials Science & Technology 2021年第15期74卷 11-20页

作者： Bin Wang yuanfu chen Qi Wu Yingjiong Lu Xiaojuan Zhang Xinqiang Wang Bo Yu DongXu Yang Wanli Zhang State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu 610054China School of Science and Institute of Oxygen SupplyTibet UniversityLhasa 850000China

In this work,a Janus-type dual-ligand metal-organic frameworks derived bimetallic(Fe,Co)P nanoparticles embedded carbon nanotube(CNT)skeleton(DLD-Fe Co P@CNT)is presented and synthesized via a facile"co-coordination synthesis"*** DLD-Fe Co P@CNT hybrid shows much better performances for OER and HER with much lower Tafel slope of 39.6(57.1)m V dec-1,an overpotential of 286(166)m V@10 m A cm^(-2)and better stability for OER(HER)in 1 M *** both cathode and anode for water splitting,it requires only a low voltage of 1.67 V to obtain 10 mA cm^(-2)with nearly 100%faradaic efficiency,which is close to Pt/C//RuO_(2)*** functional theory calculations based on the bimetallic phosphide(Fe_(0.3)Co_(0.7)P)model reveal that,compared with the monometallic Fe P or Co P,the enhanced catalytic activities of Fe_(0.3)Co_(0.7)P is mainly manifested in its free energy of H adsorption(GH*)closer to zero,larger binding strength for H2O and higher electrical conductivity.

关键词： Bimetallic phosphide Bifunctional catalyst Overall water splitting DFT calculation

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NbN quantum dots anchored hollow carbon nanorods as efficient polysulfide immobilizer and lithium stabilizer for Li-S full batteries

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Journal of Energy Chemistry 2024年第1期88卷 260-271,I0007页

作者： Fei Ma Zhuo chen Katam Srinivas Ziheng Zhang Yu Wu Dawei Liu Hesheng Yu Yue Wang Xinsheng Li Ming-qiang Zhu Qi Wu yuanfu chen School of Integrated Circuit Science and Engineering and State Key Laboratory of Electronic Thin Films and Integrated DevicesUniversity of Electronic Science and TechnologyChengdu 610054SichuanChina College of Science and Institute of Oxygen Supply Center of Tibetan Studies(Everest Research Institute)Tibet UniversityLhasa 850000TibetChina College of Mechanical and Electronic Engineering Northwest A&F UniversityXianyang 712100ShaanxiChina

The shuttle effect of lithium polysulfides(LiPSs)and uncontrollable lithium dendrite growth seriously hinder the practical application of lithium-sulfur(Li-S)*** simultaneously address such issues,monodispersed Nb N quantum dots anchored on nitrogen-doped hollow carbon nanorods(NbN@NHCR)are elaborately developed as efficient Li PSs immobilizer and Li stabilizer for high-performance Li-S full *** functional theory(DFT)calculations and experimental characterizations demonstrate that the sulfiphilic and lithiophilic NbN@NHCR hybrid can not only efficiently immobilize the soluble Li PSs and facilitate diffusion-conversion kinetics for alleviating the shuttling effect,but also homogenize the distribution of Li+ions and regulate uniform Li deposition for suppressing Li-dendrite *** a result,the assembled Li-S full batteries(NbN@NHCR-S||Nb N@NHCR-Li)deliver excellent long-term cycling stability with a low decay rate of 0.031%per cycle over 1000 cycles at high rate of 2 *** at a high S loading of 5.8 mg cm^(-2)and a low electrolyte/sulfur ratio of 5.2μL mg^(-1),a large areal capacity of 6.2 mA h cm^(-2)can be achieved in Li-S pouch cell at 0.1 *** study provides a new perspective via designing a dual-functional sulfiphilic and lithiophilic hybrid to address serious issues of the shuttle effect of S cathode and dendrite growth of Li anode.

关键词： Dual-functional host NbN quantum dots Shuttle effect Dendrite-free Li anode Li-S full batteries

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Fe_(2)P nanoparticles embedded on Ni_(2)P nanosheets as highly efficient and stable bifunctional electrocatalysts for water splitting

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Journal of Materials Science & Technology 2022年第10期105卷 266-273页

作者： Xinqiang Wang Bin Wang yuanfu chen Mengya Wang Qi Wu Katam Srinivas Bo Yu Xiaojuan Zhang Fei Ma Wanli Zhang School of Electronic Science and Engineering and State Key Laboratory of Electronic Thin Films and Integrated DevicesUniversity of Electronic Science and Technology of ChinaChengdu 610054China School of Science and Institute of Oxygen SupplyTibet UniversityLhasa 850000China

It is urgent to develop highly efficient,stable and low-cost bifunctional electrocatalysts for overall water ***,an iron-nickel phosphide(Fe_(2)P/Ni_(2)P)heterostructure,constructed by Fe_(2)P nanoparticles embedded on Ni_(2)P nanosheets,is strategically fabricated on nickel foam via a facile *** a bifunctional electrocatalyst,the Fe_(2)P/Ni_(2)P heterostructure delivers a very low overpotential of 64 m V(or 185m V)to reach current density of 10 m A cm^(-2)for hydrogen(or oxygen)evolution *** simultaneously employed as both the anode and cathode electrodes,it demonstrates an ultralow cell voltage of1.49 V@10 m A cm^(-2)for full water splitting with nearly 100%Faradaic efficiency,and superior long-term stability even over 100 *** functional theory calculations manifest that a strong heterointerface interaction could cause electron redistribution near the Fe_(2)P/Ni_(2)P heterointerface and optimize theΔG_(H)*of P sites,thus enhancing catalytic ***,the 3D porous heterostructure is beneft to expose rich active sites and facilitate ion diffusion and gas bubble release,thus promoting the catalytic *** work opens up a new strategical approach for rational design of metal phosphide-based heterostructures as highly efficient and stable bifunctional electrocatalysts for water splitting.

关键词： Heterostructure Nanosheets Electrocatalyst Overall water splitting

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Biochemical sensing in graphene-enhanced microfiber resonators with individual molecule sensitivity and selectivity

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Light(Science & Applications) 2019年第1期8卷 173-182页

作者： Zhongxu Cao Baicheng Yao chenye Qin Run Yang Yanhong Guo Yufeng Zhang Yu Wu Lei Bi yuanfu chen Zhenda Xie Gangding Peng Shu-Wei Huang Chee Wei Wong Yunjiang Rao Key Laboratory of Optical Fiber Sensing and Communications(Education Ministry of China) University of Electronic Science and Technology of ChinaChengdu 611731China State Key Lab of Electronic Thin Film and Integrated Devices University of Electronic Science and Technology of ChinaChengdu 611731China National Laboratory of Solid State Microstructures and School of Electronic Science and Engineering Nanjing UniversityNanjing 210093China School of Electrical Engineering and Telecommunications University of New South WalesSydneyNSW 2052Australia Department of Electrical Computerand Energy EngineeringUniversity of Colorado BoulderBoulderCO 80309USA Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory University of CaliforniaLos AngelesCA 90095USA Ubiquitous Sensing Center Zhejiang LaboratoryHangzhou 310000China

Photonic sensors that are able to detect and track biochemical molecules offer powerful tools for information acquisition in applications ranging from environmental analysis to medical *** ultimate aim of biochemical sensing is to achieve both quantitative sensitivity and *** atomically thick films with remarkable optoelectronic tunability,graphene and its derived materials have shown unique potential as a chemically tunable platform for sensing,thus enabling significant performance enhancement,versatile functionalization and flexible device ***,we demonstrate a partially reduced graphene oxide(prGO)inner-coated and fiber-calibrated Fabry-Perot dye resonator for biochemical *** functionalization in the prGO film enables the intracavity fluorescent resonance energy transfer(FRET)to be chemically selective in the visible ***,by measuring the intermode interference via noise canceled beat notes and locked-in heterodyne detection with Hz-level precision,we achieved individual molecule sensitivity for dopamine,nicotine and single-strand DNA *** work combines atomic-layer nanoscience and high-resolution optoelectronics,providing a way toward high-performance biochemical sensors and systems.

关键词： resonator versatile enable

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