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| 1 | Electron-transfer enhanced MoO2-Ni heterostructures as a highly efficient pH-universal catalyst for hydrogen evolution显示文摘Hydrogen is one of the most promising energy carriers to replace fossil fuels and electrolyzing water to produce hydrogen is a very effective method.However,designing highly active and stable non-precious metal hydrogen evolution electrocatalysts that can be used in universal pH is a huge challenge.Here,we have reported a simple strategy to develop a highly active and durable non-precious MoO2-Ni electrocatalyst for hydrogen evolution reaction(HER)in a wide pH range.The MoO2-Ni catalyst exhibits a superior electrocatalytic performance with low overpotentials of 46,69,and 84 mV to reach-10 mA cm-2 in 1.0 M KOH,0.5 M H2SO4,and 1.0 M PBS electrolytes,respectively.At the same time,the catalyst also shows outstanding stability over a wide pH range.It is particularly noted that the catalytic performance of MoO2-Ni in alkaline solution is comparable to the highest performing catalysts reported.The outstanding HER performance is mainly attributed to the collective effect of the rational morphological design,electronic structure engineering,and strong interfacial coupling between MoO2 and Ni in heterojunctions.This work provides a viable method for the synthesis of inexpensive and efficient HER electrocatalysts for the use in wide pH ranges. | Benzhi Wang Hexiu Huang Meilin Huang Puxuan Yan Tayirjan Taylor Isimjan Xiulin Yang | 2020 | Science China Chemistry2020，63，6： | 3 |
| 2 | Fabrication, modification and environmental applications of TiO2 nanotube arrays (TNTAs) and nanoparticles显示文摘在半导体之中,钛二氧化物由于它的丰富,低费用,稳定性,和优异电子精力乐队结构作为有效光催化剂被识别了。titania 的高度订的 nanotube 数组被阳极化和温和 sonication 生产。titania nanotube 数组的乐队差距精力被与 Fe 共同做归结为 2.6 eV, C,用包含 K3Fe (CN ) 的一个电解质解决方案的 N 原子 6。在批 photoreactor 的酚的 photoconversion 由使用由 titania nanotube 数组和 Pt/ZIF-8 nanoparticles 组成的合成 nanomaterial 基于酚的起始的集中增加了到超过 18% 。为 titania nanoparticles 的免职的一种 layer-by-layer 集会技术被开发为油水分离和耐蚀表面在 superhyrophobic 表面的空和准备中为甲苯的踪迹数量的降级制作空气过滤器。 | S. ROHANI T. ISIMJAN A. MOHAMED H. KAZEMIAN M. SALEM T. WANG | 2012 | Frontiers of Chemical Science and Engineering2012，6，1： | 2 |
| 3 | A Novel Method to Prepare Superhydrophobic, UV Resistance and Anti-colwo- sion Steel Surface 显示文摘 | ISIMJAN T T WANG T ROHANI S | 2012 | Chemical Engineering Journal2012，210，6： | 1 |
| 4 | An innovative approach to synthesize highly-ordered TiO2 nanotubes显示文摘 | Isimjan T T Yang D Q Rohani S Ray A K | | 0，，02： | 1 |
| 5 | The fabrication of highly ordered and visible-light-responsive Fe-C-N-codoped TiO2nanotubes显示文摘 | Isimjan T T Ruby A E Rohani S Ray A K | | 0，，05： | 1 |
| 6 | Photocatalytic activities of Pt/ZIF-8 loaded highly ordered TiO2 nanotubes显示文摘 | Isimjan T T Kazemian H Rohani S Ray A K | | 0，，45： | 1 |
| 7 | Transparent nanostructured coatings with UV-shielding and superhydrophobicity properties显示文摘 | Wang T Isimjan T Chen J Rohani S | | 0，，26： | 1 |
| 8 | Tissue engineering scaffolds containing embedded fluorinated zeolite particle oxygen vectors 显示文摘 | Seifu D G Isimjan T T Mequanint K | 2011 | Acta Biomaterialia2011，7，10： | 1 |
| 9 | The fabrication of highly ordered and visible-light-responsive Fe-C-N-Co-doped TiO2 nanotubes 显示文摘 | ISIMJAN T T RUBY A E ROHANI S | 2010 | Nanotechnology2010，21，05： | 1 |
| 10 | Oxygen defect-rich double-layer hierarchical porous Co3O4 arrays as high-efficient oxygen evolution catalyst for overall water splitting显示文摘Construction of oxygen evolution electrocatalysts with abundant oxygen defects and large specific surface areas can significantly improve the conversion efficiency of overall water splitting.Herein,we adopt a controlled method to prepare oxygen defect-rich double-layer hierarchical porous Co3O4 arrays on nickel foam(DL-Co3O4/NF)for water splitting.The unique array-like structure,crystallinity,porosity,and chemical states have been carefully investigated through SEM,TEM,XRD,BET,and XPS techniques.The designated DL-Co3O4/NF has oxygen defects of up to 67.7%and a large BET surface area(57.4 m2g-1).Electrochemical studies show that the catalyst only requires an overpotential of 256 mV to reach 20 mA cm-2,as well as a small Tafel slope of 60.8 mV dec-1,which is far better than all control catalysts.Besides,the catalyst also demonstrates excellent overall water splitting performance in a two-electrode system and good long-term stability,far superior to most previously reported catalysts.Electrocatalytic mechanisms indicate that abundant oxygen vacancies provide more active sites and good conductivity.At the same time,the unique porous arrays facilitate electrolyte transport and gas emissions,thereby synergistically improving OER catalytic performance. | Puxuan Yan Meilin Huang Benzhi Wang Zixia Wan Mancai Qian Hu Yan Tayirjan Taylor Isimjan Jianniao Tian Xiulin Yang | 2020 | Journal of Energy Chemistry2020，29，8： | 1 |
| 11 | The fabrication of highly ordered and visible-light-responsive Fe--C--N-codoped TiO2 nanotubes显示文摘 | Isimjan T T Ruby A E Rohani S | 2010 | Nanotechnology2010，21，05： | 1 |
| 12 | Rational design of Pd-TiO_(2)/g-C_(3)N_(4) heterojunction with enhanced photocatalytic activity through interfacial charge transfer显示文摘A hybrid heterojunction-based photocatalyst is synthesized by an electrostatic self-assembly strategy including surface modification and controlled metal deposition.The interfacial contact was made by mixing negatively charged anatase TiO_(2) nanoparticles with positively charged g-C3N4.Visible-light deposition of Pd nanoparticles largely on TiO_(2) was made possible due to the charge transfer from C_(3)N_(4)(excited by visible light)to the conduction band of TiO_(2) reducing Pd ions on contact with its surface.In order to further test the efficiency of this cascade of electron transfer across the conduction bands of the two semiconductors,photocatalytic H2 production from water was studied.Upon optimizing the ratio of the two semiconductors,increased H2 production rates were observed and attributed to enhanced charge separation.Catalysts were studied by a variety of techniques in order to probe into their properties and link them to activity.The reaction rate,under visible-light excitation,of the best sample showed an 8-fold enhancement when compared to that of Pd-C_(3)N_(4) in identical conditions and the highest apparent quantum yield of 31%was achieved by a 0.1% Pd/20%TiO_(2)/C_(3)N_(4) sample in a 420-to 443-nm range. | Tayirjan Taylor Isimjan Shahid Rasul Maher Nasser Aloufi Mohd Adnan Khan Ibrahim Khalid Alhowaish Toseef Ahmed | 2019 | Clean Energy2019，3，1： | 1 |
| 13 | 构筑富含磷空位缺陷的磷化钯催化剂实现高效和抗CO毒化的碱性氢氧化反应显示文摘碱性阴离子交换膜燃料电池(AEMFCs)可以直接将氢的化学能转化为电能,被认为是新兴绿色氢经济的基石技术.但其阳极氢氧化反应(HOR)动力学缓慢,严重依赖于Pt基催化剂.由于Pt基催化剂极易被CO毒化、动力学过程复杂以及价格昂贵,极大限制了其商业化应用.因此,亟需开发高效、稳定和抗CO毒化能力强的新型HOR催化剂.Pd具有与Pt相似的氢键结合能,并且比Pt储量丰富,有望成为实现HOR的候选催化剂.然而,Pd的本征催化活性和Pt相比仍有很大差距.近年来,磷化钯因具有功能多样性和高催化活性被广泛关注.此外,缺陷工程可以有效调控催化剂的表面结构,改善中间体的吸附强度,提高催化剂的催化活性.因此,构建富含缺陷的磷化钯催化剂有望提高其HOR的性能.然而,该方向研究较少,反应机理尚不清楚.因此,阐明空位缺陷对于提高磷化钯催化剂HOR性能的作用机制,对促进AEMFCs电催化反应具有重要意义.本文通过溶胶-凝胶法以及低温磷化策略合成了一种碗状半球结构的富含磷空位Pd3P@C(V_(p)-Pd_(3)P@C)催化剂,并用于碱性HOR.在磷化过程中,通过调整Pd前驱体和磷源比例以及煅烧温度,在碳碗状半球载体上合成具有不同晶相组成(Pd/Pd_(3)P@C,Pd_(3.20)P_(12)@C,Pd_(3)P@C,和Pd_(5)P_(2)@C)的Pd_(x)P_(y)@C催化剂.扫描电镜和透射电镜证实了催化剂为碗状半球形貌.利用电子顺磁共振波谱研究了Pd_(x)P_(y)@C催化剂的磷空位浓度,结果表明,Pd/P比例为1:3时,在350℃下煅烧得到的Vp-Pd_(3)P@C具有最高的磷空位浓度.X射线光电子能谱证实了磷空位促进了d-p轨道杂化,增强了Pd和磷之间的电子相互作用.电化学测试结果表明,Vp-Pd_(3)P@C具有最高的HOR性能,Vp-Pd_(3)P@C在50 mV的质量活性为1.66 mAμg_(Pd)^(–1),交换电流密度为3.2 mA cm^(–2),优于Pd3P(0.45 mAμg_(Pd)^(-1),1.78 mA cm^(–2))和商业Pt/C(0.3 mAμg_(Pd)^(-1),2.29 mA cm^(–2)).同时,该催化剂在50 mV的电位下能稳定运行20 h.此外,即使在CO浓度高达1000 ppm时,Vp-Pd_(3)P@C催化剂仍表现出较好的HOR活性.紫外光电子能谱证实了Vp-Pd_(3)P@C中的Pd原子呈现缺电子状态,这不利于Pd 4d轨道对CO 2π^(*)轨道的电子反馈,降低了Pd和CO的键合强度,进而减弱了Pd对CO分子的吸附,从而增强了其抗CO中毒的能力.密度泛函理论计算结果表明,相较于磷空位浓度较少的Pd_(3)P@C催化剂,富含磷空位缺陷的Vp-Pd_(3)P@C催化剂能够优化和平衡反应中间体(Hads和OHads)的吸附强度,使速率决定步骤从H_(2)O^(*)的解吸转换到H_(2)O的形成,促进了Volmer反应(Hads+OHads→H_(2)O+2^(*)sites)的进行,进而提升了催化活性.系统实验和表征结果表明,Vp-Pd_(3)P@C较好的HOR性能可归因于以下3个因素:(1)空心碗状结构大大地增加了固-液-气三相接触点,加速了HOR的传质过程;(2)磷空位产生的局部反应活性和有利的电子结构优化了Hads和OHads的吸附强度,极大地促进了Volmer步骤;(3)丰富的磷空位打破了原有的周期性晶体结构,形成了新的电子结构,有效地抑制了电子从Pd 4d轨道到CO 2π^(*)轨道的反馈,提高了Vp-Pd_(3)P@C对CO的耐受能力.综上,本文通过缺陷工程策略调控了Vp-Pd_(3)P@C中活性位点与HOR关键中间体的相互作用,明确了空位缺陷浓度与HOR活性之间的构效关系.并从碱性HOR反应机理,CO分子与金属催化剂的轨道相互作用以及结构设计三个方面总结了高效和稳定的HOR催化剂的设计原则.目前,由于界面环境的复杂性和缺乏原位技术,催化剂表面上痕量中间体的光谱信息难以获得,未来可在开发原位技术监测HOR过程中间体和催化剂的组分变化方面做出更多的努力,以促进AEMFCs的商业化应用. | 杨玉婷 石路岩 梁沁睿 刘奕 董家新 Tayirjan Taylor Isimjan 王宝 杨秀林 | 2024 | Chinese Journal of Catalysis2024，56，1： | 0 |
| 14 | Exploring the effect of Ni/Cr contents on the sheet-like NiCr-oxide-decorated CNT composites as highly active and stable catalysts for urea electrooxidation显示文摘The developing high-efficiency urea fuel cells have an irreplaceable role in solving the increasingly severe environmental crisis and energy shortages.The sluggish six-electron dynamic anodic oxidation reaction is the bottleneck of the rapid progress of urea fuel-cell technology.To tackle this challenge,we select the NiCr bimetallic system due to the unique synergic effect between the Ni and the Cr.Moreover,better conductivity is assured using carbon nanotubes(CNTs)as the support.Most importantly,we use a simple hydrothermal method in catalyst preparation for easy scale-up at a low cost.The results show that the hybrid catalysts of NiCr_(x)-oxide-CNTs with different Ni/Cr ratios show much better catalytic performance in terms of active surface area and current density as compared to that of Ni-hydro-CNTs.The optimized NiCr_(2)-oxide-CNTs catalyst exhibits not only the largest electrochemically active surface area(ESA,50.7 m^(2) g^(−1))and the highest urea electrocatalytic current density(115.6 mA cm^(−2)),but also outstanding long-term stability.The prominent performance of the NiCr_(2)-oxide-CNTs catalyst is due to the combined effect of the improved charge transfer between Ni and Cr species,the large ESA,along with an elegant balance between the oxygen-defect sites and hydrophilicity.Moreover,we have proposed a synergistically enhanced urea catalytic mechanism. | Qiuping Gan Benzhi Wang Judan Chen Jianniao Tian Tayirjan Taylor Isimjan Xiulin Yang | 2020 | Clean Energy2020，4，1： | 0 |
| 15 | Valence electronic engineering of superhydrophilic Dy-evoked Ni-MOF outperforming RuO_(2) for highly efficient electrocatalytic oxygen evolution显示文摘Tackling the problem of poor conductivity and catalytic stability of pristine metal-organic frameworks(MOFs) is crucial to improve their oxygen evolution reaction(OER) performance.Herein,we introduce a novel strategy of dysprosium(Dy) doping,using the unique 4f orbitals of this rare earth element to enhance electrocatalytic activity of MOFs.Our method involves constructing Dy-doped Ni-MOF(Dy@Ni-MOF) nanoneedles on carbon cloth via a Dy-induced valence electronic perturbation approach.Experiments and density functional theory(DFT) calculations reveal that Dy doping can effectively modify the electronic structure of the Ni active centers and foster a strong electronic interaction between Ni and Dy.The resulting benefits include a reduced work function and a closer proximity of the d-band center to the Fermi level,which is conducive to improving electrical conductivity and promoting the adsorption of oxygen-containing intermediates.Furthermore,the Dy@Ni-MOF achieves superhydrophilicity,ensuring effective electrolyte contact and thus accelerating reaction kinetics,Ex-situ and in-situ analysis results manifest Dy_(2)O_(3)/NiOOH as the actual active species.Therefore,Dy@Ni-MOF shows impressive OER performance,significantly surpassing Ni-MOF.Besides,the overall water splitting device with Dy@NiMOF as an anode delivers a low cell voltage of 1.51 V at 10 mA cm^(-2) and demonstrates long-term stability for 100 h,positioning it as a promising substitute for precious metal catalysts. | Zhiyang Huang Miao Liao Shifan Zhang Lixia Wang Mingcheng Gao Zuyang Luo Tayirjan Taylor Isimjan Bao Wang Xiulin Yang | 2024 | Journal of Energy Chemistry2024，90，3： | 0 |
| 16 | Interface engineering of porous Fe^(2)P-WO_(2.92) catalyst with oxygen vacancies for highly active and stable large-current oxygen evolution and overall water splitting显示文摘Constructing a low cost,and high-efficiency oxygen evolution reaction(OER)electrocatalyst is of great significance for improving the performance of alkaline electrolyzer,which is still suffering from highenergy consumption.Herein,we created a porous iron phosphide and tungsten oxide self-supporting electrocatalyst with oxygen-containing vacancies on foam nickel(Fe_(2)P-WO_(2.92)/NF)through a facile insitu growth,etching and phosphating strategies.The sequence-controllable strategy will not only generate oxygen vacancies and improve the charge transfer between Fe_(2)P and WO_(2.92) components,but also improve the catalyst porosity and expose more active sites.Electrochemical studies illustrate that the Fe_(2)P-WO_(2.92)/NF catalyst presents good OER activity with a low overpotential of 267 mV at 100 mA cm^(-2),a small Tafel slope of 46.3 mV dec^(-1),high electrical conductivity,and reliable stability at high current density(100 mA cm^(-2) for over 60 h in 1.0 M KOH solution).Most significantly,the operating cell voltage of Fe_(2)P-WO_(2.92)/NF‖Pt/C is as low as 1.90 V at 400 mA cm^(-2) in alkaline condition,which is one of the lowest reported in the literature.The electrocatalytic mechanism shows that the oxygen vacancies and the synergy between Fe_(2)P and WO_(2.92) can adjust the electronic structure and provide more reaction sites,thereby synergistically increasing OER activity.This work provides a feasible strategy to fabricate high-efficiency and stable non-noble metal OER electrocatalysts on the engineering interface. | Qimin Peng Qiuting He Yan Hu Tayirjan Taylor Isimjan Ruobing Hou Xiulin Yang | 2022 | Journal of Energy Chemistry2022，31，2： | 0 |
| 17 | Electronically modulated d-band centers of MOF-derived carbon-supported Ru/HfO_(2) for oxygen reduction and aqueous/flexible zinc-air batteries显示文摘The construction of oxide/metal composite catalysts is a competent means of exploiting the electronic interactions between oxide/metal to enhance catalytic activity.In this work,we construct a novel heterogeneous composite(Ru/HfO_(2)-NC)with Ru/HfO2nanoparticles nested in nitrogen-doped porous carbon via a zeolitic imidazole frameworks-assisted(ZIF)co-precipitation and calcination approach.In particular,ZIF guides an in-situ construction of nested configuration and confines the scattered nanoparticles.Strikingly,Ru/HfO_(2)-NC exhibits unusual ORR activity,superb durability,and methanol tolerance in0.1 M KOH solution with high half-wave potential(E1/2)of 0.83 V and follows a near-4e-reaction pathway.Additionally,the ZAB assembled with cathodic Ru/HfO_(2)-NC outputs a power density of 157.3 m W cm^(-2),a specific capacity of 775 mA h g-1Zn,and a prolonged lifespan of 258 h at 5 mA cm^(-2).Meanwhile,the catalyst has demonstrated potential applicability in flexible ZAB.As suggested by experimental results and density functional theory(DFT)analysis,the remarkable property possibly originated from the optimization of the adsorption and desorption of reactive intermediates caused by the reconfiguration of the electronic structure between Ru and HfO_(2). | Chuan Hu Fengli Wei Qinrui Liang Qiming Peng Yuting Yang Tayirjan Taylor Isimjan Xiulin Yang | 2023 | Journal of Energy Chemistry2023，，5： | 0 |
| 18 | Delicate surface vacancies engineering of Ru doped MOF-derived Ni-NiO@C hollow microsphere superstructure to achieve outstanding hydrogen oxidation performance显示文摘Surface vacancy defects,as the bridge between theoretical structural study and the design of heterogenous catalysts,have captured much attention.This work develops a metal-organic framework-engaged replacement-pyrolysis approach to obtain highly dispersed Ru nanoparticles immobilized on the vacancy-rich Ni-NiO@C hollow microsphere(Ru/Ni-NiO@C).Fine annealing at 400°C introduces nickel and oxygen vacancies on Ru/Ni-NiO@C surface,resulting in an improved electrical conductivity and rapid mass-charge transfer efficiency.Ru/Ni-NiO@C with a hollow micro/nanostructure and interconnected meso-porosity favors the maximal exposure of abundant active sites and elevation of hydrogen oxidation reaction(HOR)activity.Experimental results and density functional theory(DFT)calculations reveal that an electronic effect between Ru and Ni-NiO@C,in conjunction with nickel/oxygen vacancies in the NiO species could synergistically optimize hydrogen binding energy(HBE)and hydroxide binding energy(OHBE).The HBE and OHBE optimizations thus created confer Ru/Ni-NiO@C with a mass activity over 7.75 times higher than commercial Pt/C.Our work may provide a constructive route to make a breakthrough in elevating the hydrogen electrocatalytic performance. | Yuting Yang Yi Huang Shuqing Zhou Yi Liu Luyan Shi Tayirjan Taylor Isimjan Xiulin Yang | 2022 | Journal of Energy Chemistry2022，31，9： | 0 |
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