搜索到5832篇“ ORR“的相关文章
Heteroatom doping regulates the catalytic performance of singleatom catalyst supported on graphene for ORR被引量:1
2024年
Replacing fossil fuels with fuel cells is a feasible way to reduce global energy shortages and environmental pollution.However,the oxygen reduction reaction(ORR)at the cathode has sluggish kinetics,which limits the development of fuel cells.It is significant to develop catalysts with high catalytic activity of ORR.The single-atom catalysts(SACs)of Pt supported on heteroatom-doped graphene are potential candidates for ORR.Here we studied the SACs of Pt with different heteroatoms doping and screened out Pt-C_(4) and Pt-C_(3)O_(1) structures with only 0.13 V overpotential for ORR.Meanwhile,it is found that B atoms doping could weaken the adsorption capacity of Pt,while N or O atoms doping could enhance it.This regularity was verified on Fe SACs.Through the electronic interaction analysis between Pt and adsorbate,we explained the mechanism of this regularity and further proposed a new descriptor named corrected d-band center(ε_(d-corr))to describe it.This descriptor is an appropriate reflection of the number of free electrons of the SACs,which could evaluate its adsorption capacity.Our work provides a purposeful regulatory strategy for the design of ORR catalysts.
Ji-Kai SunYu-Wei PanMeng-Qian XuLei SunShaolong ZhangWei-Qiao DengDong Zhai
Laser-optimized Pt-Y alloy nanoparticles embedded in Pt-Y oxide matrix for high stability and ORR electrocatalytic activity
2024年
The development of active yet stable catalysts for oxygen reduction reaction(ORR)is still a major issue for the extensive permeation of fuel cells into everyday technology.While nanostructured Pt catalysts are to date the best available systems in terms of activity,the same is not true for stability,particularly under operating conditions.In this work,Pt_(Х)Y alloy nanoparticles are proposed as active and durable electrocatalysts for ORR.Pt_(Х)Y nanoalloys are synthesized and further optimized by laser ablation in liquid followed by laser fragmentation in liquid.The novel integrated laser-assisted methodology succeeded in producing Pt_(Х)Y nanoparticles with the ideal size(<10 nm)of commercial Pt catalysts,yet resulting remarkably more active with E_(1/2)=0.943 V vs.RHE,specific activity=1095μA cm^(-2) and mass activity>1000 A g^(-1).At the same time,the nanoalloys are embedded in a fine Pt oxide matrix,which allows a greater stability of the catalyst than the commercial Pt reference,as directly verified on a gas diffusion electrode.
Riccardo BrandieleAndrea GuadagniniMattia ParnigottoFederico PiniVito CovielloDenis BadoccoPaolo PastoreGian Andrea RizziAndrea VittadiniDaniel ForrerVincenzo AmendolaChristian Durante
关键词:ELECTROCATALYSISORRPTONANOALLOYS
ZIF-67衍生负载Co/Co 9S 8碳材料作为ORR催化剂的研究
2024年
锌-空气电池作为一种重要的电化学能源存储和转换技术,因其能量密度高、成本低和环境友好等优点受到广泛关注。然而,由于其空气阴极缓慢的动力学反应,阻碍了锌-空气电池的进一步发展。因此,我们采用了一种水热-高温热解-氨气还原的方法,制备出ZIF-67衍生N掺杂碳基Co和Co_(9)S_(8)纳米颗粒的电催化剂(Co/Co_(9)S_(8)@NC-1)。电化学测试结果表明,该催化剂具有优异的ORR催化活性,其半波电位为0.85 V,接近商用Pt/C。与基于Pt/C+Ir/C的锌-空气电池(开路电压:1.47 V)相比,Co/Co_(9)S_(8)@NC-1基的锌-空气电池具有1.51 V的开路电压,且表现出105.3 mW/cm的功率密度和172 h循环稳定性(Pt/C+Ir/C:147 h)。此工作为开发非贵金属基ORR催化剂提供了有效途径。
毕鹏飞刘培涛祖延清李晓东朱旭冯爱玲
关键词:金属有机骨架氧还原反应非贵金属催化剂锌-空气电池
α-MnO_(2)作为先进的双功能ORR/IOR电催化剂构建可充电锌空电池
2024年
析氧反应(oxygen evolution reaction,OER)和氧还原反应(oxygen reduction reaction,ORR)是可充电锌空电池(rechargeable Zn-air batteries,RZABs)重要的两个反应。其中,析氧反应具有较高的热力学平衡电位和复杂的反应路径,实际应用中需要高的充电电压驱动其发生,这将带来一系列问题并且限制了RZABs的商业化应用。基于此,本研究构造α-MnO_(2)并作为ORR/IOR双功能催化剂。在碱性体系中引入反应改性剂KI,α-MnO_(2)对碘离子氧化反应(iodide oxidation reaction,IOR)具有更低的阳极氧化电位和更快的催化动力学。当1.0 mol/L KOH电解液中添加0.5 mol/L KI时,相比于OER(1.709 V@10 mA/cm^(2)),α-MnO_(2)在IOR过程中电流密度达到10 mA/cm^(2)时阳极电位减小了398 mV(1.311 V vs.RHE),且表现出低至57.5 mV/dec塔菲尔斜率。相对于与Pt/C,在含有KI的KOH电解液中,α-MnO_(2)表现出与Pt/C相媲美的ORR活性。此外,以α-MnO_(2)为空气电极组装成RZAB后,该电池也表现出了优异的充电活性和良好的循环寿命,在5 mA/cm^(2)电流密度下,充放电电压间隙由0.97 V缩减为0.61 V,能量转换效率由54.9%提升至66.2%。
王振赵慧周菊红盛可发王涛江彬彬
Metal and ligand modification modulates the electrocatalytic HER,OER,and ORR activity of 2D conductive metal-organic frameworks
2024年
It is highly desirable to design efficient and stable hydrogen evolution reaction(HER)and oxygen evolution/reduction reaction(OER/ORR)electrocatalysts for the development of renewable energy technologies.Herein,density functional theory(DFT)calculations were conducted to systematically investigate a series of TMN_(x)O_(4-x)-HTT(TM=Fe,Co,Ni,Ru,Rh,Pd,Ir and Pt;HTT=hexahydroxy tetraazanaphthotetraphene)analogs of two-dimensional(2D)conductive metal-organic frameworks(MOFs)as potential electrocatalysts for the HER,OER and ORR.The thermodynamic and electrochemical stability simulations suggest that these designed catalysts are stable.Remarkably,CoO_(4)-HTT,RhN_(3)O_(1)-HTT and IrN3O1-HTT are predicted to be the most promising catalysts for the HER,OER and ORR,respectively,surpassing the catalytic activity of corresponding benchmark catalysts.The volcano plots were established based on the scaling relationship of adsorption Gibbs free energy of intermediates.The results reveal that regulating combinations of metal active centers and local coordination environments could effectively balance the interaction strength between intermediates and catalysts,thus achieving optimal catalytic activity.Our findings not only opt for the promising HER/OER/ORR electrocatalysts but also guide the design of efficient electrocatalysts based on 2D MOFs materials.
Yanan ZhouLi ShengLanlan ChenWenhui ZhaoWenhua ZhangJinlong Yang
一种构筑具有三维空间结构的活性位ORR合金催化剂方法
本发明涉及催化剂技术领域,提供了一种构筑具有三维空间结构的活性位ORR合金催化剂方法。本发明旨在解决现有铂基催化剂在氧还原反应(ORR)中活性不足、成本高的问题,主要方案包括设计具有三维空间结构的多低指数合金晶面模型的方...
杨娜牛晓滨
一种ORR和OER双功能催化剂及其制备方法和应用
本发明属于电催化化学领域,具体为一种ORR和OER双功能催化剂及其制备方法和应用。所述催化剂的分子式为NiCo<Sub>1.8</Sub>Fe<Sub>0.2</Sub>O<Sub>4</Sub>@NCF,结构为尖晶石复...
刘艳艳李保军周立敏刘书菱
一种促进电催化ORR性能提升的溶液及其制备方法
本发明属于催化剂技术领域,具体涉及一种促进电催化ORR性能提升的溶液及其制备方法。该溶液包括:按质量百分比计,将以下组分:3.3%‑3.4%硫酸钾、0%‑0.07%磷酸二氢钾、0%‑0.016%磷酸二钾氢、以及95.98...
崔春华李情肖梦君
基于空气为反应气源的潜在ORR和NRR催化剂的方法
本发明提供一种基于空气为反应气源的潜在ORR和NRR催化剂的方法,基于不同N‑C配位环境和不同活性位点Tm原子构筑单原子催化剂模型,依托第一性原理密度泛函理论开展稳定性分析、空气主成分竞争性吸附、物脱附的层层渐进式筛选,...
刘超金璐雅陈明伟王道淼漆小鹏刘美玲
Introducing hydroxyl groups to tailor the d-band center of Ir atom through side anchoring for boosted ORR and HER
2024年
Tuning the coordination atoms of central metal is an effective means to improve the electrocatalytic activity of atomic catalysts.Herein,iridium(Ir) is proposed to be asymmetrically anchored by sp-N and pyridinic N of hydrogen-substituted graphdiyne(HsGDY),and coordinated with OH as an Ir atomic catalyst(Ir_(1)-N-HsGDY).The electron structures,especially the d-band center of Ir atom,are optimized by these specific coordination atoms.Thus,the as-synthesized Ir_(1)-N-HsGDY exhibits excellent electrocatalytic performances for oxygen reduction and hydrogen evolution reactions in both acidic and alkaline media.Benefiting from the unique structure of HsGDY,IrN_(2)(OH)_(3) has been developed and demonstrated to act as the active site in these electrochemical reactions.All those indicate the fresh role of the sp-N in graphdiyne in producing a new anchor way and contributing to promote the electrocatalytic activity,showing a new strategy to design novel electrochemical catalysts.
Qing LvMeiping LiXiaodong LiXingru YanZhufeng HouChangshui Huang
关键词:ELECTROCATALYSIS

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