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Boost the Utilization of Dense FeN_(4) Sites for High-Performance Proton Exchange Membrane Fuel Cells

Energy & Environmental Materials 2024年第3期7卷 398-405页

作者： Yanrong Li Shuhu Yin Long Chen Xiaoyang Cheng chongtai wang Yanxia Jiang Shigang Sun State Key Laboratory of Physical Chemistry of Solid Surfaces Engineering Research Center of Electrochemical Technologies of Ministry of EducationCollege of Chemistry and Chemical Engineering and Discipline of Intelligent Instrument and EquipmentXiamen UniversityXiamen 361005China College of Chemistry and Chemical Engineering Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan ProvinceHainan Normal UniversityHaikou 571158China

Iron-nitrogen-carbon(Fe-N-C)catalysts for the oxygen reduction reaction(ORR)in proton exchange membrane fuel cells(PEMFCs)have seriously been hindered by their poor ORR performance of Fe-N-C due to the low active site density(SD)and site ***,we reported a melamine-assisted vapor deposition approach to overcome these *** melamine not only compensates for the loss of nitrogen caused by high-temperature pyrolysis but also effectively etches the carbon substrate,increasing the external surface area and mesoporous porosity of the carbon *** can provide more useful area for subsequent vapor deposition on active *** prepared 0.20Mela-FeNC catalyst shows a fourfold higher SD value and site utilization than the FeNC without the treatment of *** a result,0.20Mela-FeNC catalyst exhibits a high ORR activity with a half-wave potential(E_(1/2))of 0.861 V and 12-fold higher ORR mass activity than the FeNC in acidic *** the cathode in a H_(2)-O_(2)PEMFCs,0.20Mela-FeNC catalyst demonstrates a high peak power density of 1.30 W cm^(-2),outstripping most of the reported Fe-N-C *** developed melamine-assisted vapor deposition approach for boosting the SD and utilization of Fe-N-C catalysts offers a new insight into high-performance ORR electrocatalysts.

关键词： fuel cells melamine oxygen reduction reaction site density utilization

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MOFs derived FeNi_(3) nanoparticles decorated hollow N-doped carbon rod for high-performance oxygen evolution reaction

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Green Energy & Environment 2022年第3期7卷 423-431页

作者： Gaopeng Liu Bin wang Lin wang Wenxian Wei Yu Quan chongtai wang Wenshuai Zhu Huaming Li Jiexiang Xia School of Chemistry and Chemical Engineering Institute for Energy ResearchJiangsu University301 Xuefu RoadZhenjiang212013China Testing Center Yangzhou UniversityYangzhouJiangsu225009China School of Chemistry and Chemical Engineering The Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan ProvinceHainan Normal UniversityHaikouHainan571158China

The sluggish electrochemical oxygen evolution reaction(OER) is a crucial process for clean energy conversion *** preparation of non-precious electrocatalysts with high performance for OER is still a main ***,we report a FeNi_(3) nanoparticles incorporated on N-doped hollow carbon rod with extraordinary performance toward OER by in situ annealing the Ni-doped Fe based metal-organic frameworks(MOFs) ***,the pristine N atoms of MOFs doped into carbon frameworks can enhance the electrical conductivity,boost electron mass transport and electron transfer,and construct more active ***,constructing the Fe-Ni alloy structure can facilitate the formation of O-O bond,optimize the free energy for intermediate adsorption and improve OER *** as-prepared Fe-Ni bimetal decorated hollow N-doped nanocarbon hybrid structure possesses superior OER performance,which is surpass commercial IrO_(2) at a overpotential of only 340 mV to achieve the current density of 10 mA cm^(-2),as well as a small Tafel slope of 86.67 mV dec^(-1) in alkaline *** Fe-Ni alloy/hollow N-doped nanocarbon hybrid structure shining the bright future for obtaining earth-abundant and superior efficient anode OER electrocatalyst.

关键词： alloy performance carbon

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CdBiO2Br nanosheets in situ strong coupling to carbonized polymer dots and improved photocatalytic activity for organic pollutants degradation

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Chinese Chemical Letters 2022年第12期33卷 5189-5195页

作者： Zhiyuan Pang Bin wang Xingwang Yan chongtai wang Sheng Yin Huaming Li Jiexiang Xia School of Chemistry and Chemical Engineering Institute for Energy ResearchJiangsu UniversityZhenjiang 212013China School of Chemistry and Chemical Engineering the Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan ProvinceHainan Normal UniversityHaikou 571158China

Carbonized polymer dots(CPDs)modified layer-structured CdBiO_(2)Br(CPDs/CdBiO_(2)Br)Z-scheme heterojunction hybrid material has been synthesized via simple solvothermal *** hybrid material with Z-scheme heterojunction can effectively maintain the original highly oxidizing holes of CdBiO_(2)Br and the highly reducing electrons of *** addition,the construction of heterostructure is beneficial to the migration and separation of photogenerated *** visible light irradiation,6 wt%CPDs/CdBiO_(2)Br showed the best catalytic activity for degradation of organic *** radical capture experiments and ESR analysis confirmed that the main active species are·O_(2)^(-)and h^(+).The decomposition process of organic pollutants was analyzed by ***,the probable visible light mechanism performance of CPDs/CdBiO_(2)Br as direct Z-scheme heterojunction photocatalytic materials was proposed.

关键词： Carbonized polymer dots CdBiO_(2)Br Direct Z-scheme heterojunction Pollutant degradation Photocatalytic activity

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P-Ni_(4)Mo Catalyst for Seawater Electrolysis with High Current Density and Durability

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Chinese Journal of Structural Chemistry 2022年第7期41卷 68-73页

作者： Gai Li Suyang Feng Jing Li Peilin Deng Xinlong Tian chongtai wang Yingjie Hua Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan Province Key Laboratory of Electrochemical Energy Storage and Light Energy Conversion Materials of Haikou CitySchool of Chemistry and Chemical EngineeringHainan Normal UniversityHaikou 571158China State Key Laboratory of Marine Resource Utilization in South China Sea Hainan Provincial Key Lab of Fine ChemistrySchool of Chemical Engineering and TechnologyHainan UniversityHaikou 570228China

Rational design of highly efficient and durable electrocatalysts with low cost to replace noblemetal based catalysts for seawater electrolysis is extremely desirable,but *** this work,we demonstrate a rapid electrodeposition method by growing P-Ni_(4)Mo on the surface of the copper foam(CF)substrate to synthesize an efficient seawater electrolysis catalyst(P-Ni_(4)Mo/CF).The catalyst exhibited considerable HER performance and stability in alkaline seawater,with the overpotential as low as 260 mV at a current density of 100 mA cm^(-2).The P-Ni_(4)Mo/CF is capable of achieving 1.0 A cm^(-2) with an overpotential of 551 mV,which is slightly worse than that of the Pt/C catalyst(453 mV).Moreover,P-Ni_(4)Mo/CF demonstrates robust durability,with almost no activity loss after the durability test for more than 200 *** work not only reports a new catalyst for seawater electrolysis,but also presents a strategy for the performance enhancement of seawater electrolysis.

关键词： seawater electrolysis electrodeposition hydrogen evolution reaction phosphorus doping

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Cryo-induced closely bonded heterostructure for effective CO2 conversion:The case of ultrathin BP nanosheets/g-C3N4

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Journal of Energy Chemistry 2020年第10期29卷 89-95页

作者： Guli Zhou Jinman Yang Xingwang Zhu Qidi Li Qing Yu Wiam El-alami chongtai wang Yuanbin She Junchao Qian Hui Xu Huaming Li School of Chemistry and Chemical Engineering Institute for Energy ResearchJiangsu UniversityZhenjiang 212013JiangsuChina School of Chemistry and Chemical Engineering Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan ProvinceHainan Normal UniversityHaikou 571158HainanChina State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology College of Chemical EngineeringZhejiang University of TechnologyHangzhou 310014ZhejiangChina School of Chemistry Biology and Materials EngineeringSuzhou University of Science and TechnologySuzhou 215009JiangsuChina

Black phosphorus(BP),an interesting and multi-functional non-metal material,has attracted widespread *** this work,2D BP/2D g-C3N4 heterostructure had been fabricated at extremely low temperature,which was used to reduce CO2 for the first *** introduction of 2D BP,the separation of photogenerated holes and electrons was extremely boosted,and composites showed excellent photocatalytic performance(CO2 to CO).Meanwhile,the targeted composite could keep high selectivity for CO generation and CO generation rate can be up to 187.7μmol g−1 h^−*** formation process of the unique heterostructure and the key factor affecting the photocatalytic performance were also *** work provides a new approach for designing metal free photocatalyst,which is used for CO2 reduction.

关键词： 2D BP 2D g-C3N4 Heterostructure CO2 photoreduction

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Electronic modulation of two-dimensional bismuth-based nanosheets for electrocatalytic CO_(2) reduction to formate: A review

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Materials Reports(Energy) 2023年第1期3卷 51-64,I0002页

作者： Guan wang Fangyuan wang Peilin Deng Jing Li chongtai wang Yingjie Hua Yijun Shen Xinlong Tian State Key Laboratory of Marine Resource Utilization in South China Sea Hainan Provincial Key Lab of Fine ChemistrySchool of Chemical Engineering and TechnologyHainan UniversityHaikou570228China Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan Province School of Chemistry and Chemical EngineeringHainan Normal UniversityHaikou571158China

Electrocatalytic CO_(2) reduction reaction(eCO_(2) RR)has significant relevance to settle the global energy crisis and abnormal climate problem via mitigating the excess emission of waste CO_(2) and producing high-value-added ***,eCO_(2) RR to formic acid or formate is one of the most technologically and economically viable approaches to realize high-efficiency CO_(2) utilization,and the development of efficient electrocatalysts is very urgent to achieve efficient and stable catalytic *** this review,the recent advances for two-dimensional bismuth-based nanosheets(2D Bi-based NSs)electrocatalysts are concluded from both theoretical and experimental ***,the preparation strategies of 2D Bi-based NSs in aspects to precisely control the thickness and uniformity are *** addition,the electronic regulation strategies of 2D Bi-based NSs are highlighted to gain insight into the effects of the structure-property relationship on facilitating CO_(2) activation,improving product selectivity,and optimizing carrier transport ***,the considerable challenges and opportunities of 2D Bi-based NSs are discussed to lighten new directions for future research of eCO_(2) RR.

关键词： CO_(2) electroreduction Two-dimensional structure Bismuth-based catalysts Preparation strategy Electronic structure regulation Formate

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Effect of Nitrogen Ion Implantation on the Structure and Corrosion Resistance of Equiatomic NiTi Shape Memory Alloy

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Journal of Wuhan University of Technology(Materials Science) 2006年第4期21卷 36-39页

作者：华英杰 Department of Chemistry Hainan Normal University Haikou 571158China

To protect the surface of NiTi from corrosion, an ion implantation method was proposed. In the present work, a surface oxidized sample was implanted with nitrogen at energy of 100 keV. The corrosion resistarwe property was examined by the anodic polarization method in a simulated body fluid （SBF） at a temperature of 37 ℃ and contrasted to non-implanted NiTi samples. The composition and structure of the implanted layers were investigated by XPS. The experimental results from the electrochemical measurements provide an evidence that the nitrogen ion-implantation increases the corrosion resistance of NiTi shape memory alloy.

关键词： biocompatibility NiTi shape memory alloy ion implantation corrosion resistance

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阴离子交换树脂负载铁取代杂多酸可见光催化降解罗丹明B

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材料导报 2013年第2期27卷 100-104页

作者：王靓夏华王崇太华英杰中国地质大学材料与化学学院武汉430074 海南师范大学化学与化工学院海口571158

将Keggin型铁取代杂多酸阴离子PW11O39Fe(Ⅲ)(H2O)4-(PW11Fe)通过离子交换作用负载在阴离子交换树脂D301R上,制备了负载型光催化剂PW11Fe/D301R,并用于可见光催化降解水溶液中有机染料污染物罗丹明B(RhB),考察了罗丹明B的初始浓度、催... 详细信息

将Keggin型铁取代杂多酸阴离子PW11O39Fe(Ⅲ)(H2O)4-(PW11Fe)通过离子交换作用负载在阴离子交换树脂D301R上,制备了负载型光催化剂PW11Fe/D301R,并用于可见光催化降解水溶液中有机染料污染物罗丹明B(RhB),考察了罗丹明B的初始浓度、催化剂用量、pH值以及不同阴离子对光催化降解效果的影响。实验结果表明,当催化剂用量为0.5g时,200W金卤灯照射0.01mmol/L RhB水溶液30min,RhB的降解率可达100%,为高效利用太阳光能去除水体有机染料污染物提供了一条可供选择的新途径。

关键词：铁取代杂多酸阴离子异相光催化罗丹明B降解 D301R树脂

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高能原电子下金属曲面二次电子发射的理论研究

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半导体光电 2010年第3期31卷 430-432页

作者：龙建飞罗崇泰王多书李晨兰州物理研究所表面工程技术国家级重点实验室兰州730000

从半经典定理出发,根据金属二次电子发射系数与入射角度的近似关系,分析了曲面的二次电子发射,推导出高能原电子入射情况下,两种常规金属曲面(圆柱曲面和球冠曲面)的二次电子发射系数,进一步得到任意曲面二次电子发射系数的求解思路,分... 详细信息

从半经典定理出发,根据金属二次电子发射系数与入射角度的近似关系,分析了曲面的二次电子发射,推导出高能原电子入射情况下,两种常规金属曲面(圆柱曲面和球冠曲面)的二次电子发射系数,进一步得到任意曲面二次电子发射系数的求解思路,分析并讨论了结果。

关键词：二次电子发射曲面入射角

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NiTi合金表面镍离子释放的电子结构理论计算

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计算机与应用化学 2005年第12期22卷 1115-1118页

作者：华英杰王崇太孟长功海南师范学院化学系海南海口571158 大连理工大学化工学院辽宁大连116023

采用电荷自洽离散变分Xα方法,对NiTi合金表面生成TiO2氧化层时镍的释放行为进行了理论计算。选取TiO2的主要晶态金红石构型,通过构造合理的团簇模型,计算镍离子在金红石(110)和(100)表面扩散的可能性及其强度大小。对键级、电荷分布,... 详细信息

采用电荷自洽离散变分Xα方法,对NiTi合金表面生成TiO2氧化层时镍的释放行为进行了理论计算。选取TiO2的主要晶态金红石构型,通过构造合理的团簇模型,计算镍离子在金红石(110)和(100)表面扩散的可能性及其强度大小。对键级、电荷分布,以及态密度的计算结果进行分析显示,当NiTi合金表面形成金红石型TiO2表面膜时,由于镍原子与氧原子之间发生有效的共价成键作用,会抑制表面镍离子的溶出,即从理论上验证了在NiTi合金表面制备金红石型TiO2氧化膜将有利于提高其生物相容性。

关键词： NiTi形状记忆合金离散变分妇方法金红石

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