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| 1 | Bimetallic Nickel Cobalt Sulfide as E cient Electrocatalyst for Zn–Air Battery and Water Splitting显示文摘The development of e cient earth-abundant electrocatalysts for oxygen reduction, oxygen evolution, and hydrogen evolution reactions(ORR, OER, and HER) is important for future energy conversion and energy storage devices, for which both rechargeable Zn–air batteries and water splitting have raised great expectations. Herein, we report a single-phase bimetallic nickel cobalt sulfide((Ni,Co)S_2) as an e cient electrocatalyst for both OER and ORR. Owing to the synergistic combination of Ni and Co, the(Ni,Co)S_2 exhibits superior electrocatalytic performance for ORR, OER, and HER in an alkaline electrolyte, and the first principle calculation results indicate that the reaction of an adsorbed O atom with a H_2O molecule to form a *OOH is the potential limiting step in the OER. Importantly, it could be utilized as an advanced air electrode material in Zn–air batteries, which shows an enhanced charge–discharge performance(charging voltage of 1.71 V and discharge voltage of 1.26 V at 2 mA cm^(-2)), large specific capacity(842 mAh g_(Zn)^(-1) at 5 mA cm^(-2)), and excellent cycling stability(480 h). Interestingly, the(Ni,Co)S_2-based Zn–air battery can e ciently power an electrochemical water-splitting unit with(Ni,Co)S_2 serving as both the electrodes. This reveals that the prepared(Ni,Co)S_2 has promising applications in future energy conversion and energy storage devices. | Jingyan Zhang Xiaowan Bai Tongtong Wang Wen Xiao Pinxian Xi Jinlan Wang Daqiang Gao John Wang | 2019 | Nano-Micro Letters2019，11，1： | 4 |
| 2 | Transition-metal-doped NiSe2 nanosheets towards efficient hydrogen evolution reactions显示文摘Transition metal diselenides are promising electrocatalysts for hydrogenevolution and therefore different approaches have been proposed to enhancetheir catalytic activity. Herein, we describe systematic studies of the dependenceof transition-metal doping on the catalytic activity of NiSe2 by first principlescalculations, where Fe is demonstrated to be the best candidate element to tunethe electrocatalytic activity of NiSe2 with lower AGH. values and increasedelectrical conductivity. To provide further experimental evidence, Fe-dopedNiSe2 porous nanosheets grown on carbon cloth are successfully developed.These nanosheets show significantly improved efficiency for hydrogen evolutionreactions compared to their un-doped counterpart. The optimized Ni0.sFe0.2Se2electrocatalyst gives rise to a current density of 10 mA.cm-2 at a very lowoverpotential of 64 mV with outstanding long-term stability. The present strategyof doping NiSe2-based electrocatalysts with transition metals paves a newpathway for the design and synthesis of electrocatalysts for large-scale electro-chemical energy applications. | Tongtong Wang Daqiang Gao Wen Xiao Pinxian Xi Desheng Xue John Wang | 2018 | Nano Research2018，11，11： | 4 |
| 3 | Surfactant free RGO/Pd nanocomposites as highly active heterogene- ous catalysts for the hydrolytic dehydrogenation of ammo- nia borane for chemical hydrogen storage 显示文摘 | Xi Pinxian Chen Fengjuan Xie Guoqiang | 2012 | Nanoscale2012，4，18： | 1 |
| 4 | Construction of surface lattice oxygen in metallic N-CuCoS1.97 porous nanowire for wearable Zn-air battery显示文摘Achieving high activity and stability oxygen evolution reaction(OER) catalysts to optimize the efficiency of metal-air battery, water splitting and other energy conversion devices, remains a formidable challenge.Herein, we demonstrate the metallic porous nanowires arrays with abundant defects via nitrogen and copper codoped CoS1.97 nanowires(N-CuCoS1.97 NWs). The N-CuCoS1.97 NWs can serve as an excellent OER self-supported electrode with an overpotential of 280 mV(j = 10 m A cm-2) and remarkable long-term stability. The X-ray absorption near-edge structure(XANES) and X-ray photoelectron spectrum(XPS) measurements confirmed the surface lattice oxygen created on the N-CuCoS1.97 NWs during OER. Then, the density function theory(DFT) results evident that lattice oxygen constructed surface of N-CuCoS1.97 NWs has more favorable OER energetic profiles and absorption for reaction intermediate. More importantly,the flexible and wearable Zn-air battery fabricated by the N-CuCoS1.97 NWs shows excellent rechargeable and mechanical stability, which can be used in portable mobile device. | Jie Yin Binbin Wei Yuxuan Li Yefei Li Pinxian Xi | 2019 | Journal of Energy Chemistry2019，28，7： | 1 |
| 5 | Ruthenium-modified porous NiCo2O4 nanosheets boost overall water splitting in alkaline solution显示文摘Exploring efficient oxygen evolution reaction(OER)and hydrogen evolution reaction(HER)electrocatalysts is crucial for developing water splitting devices.The composition and structure of catalysts are of great importance for catalytic performance.In this work,a heterogeneous Ru modified strategy is engineered to improve the catalytic performance of porous NiCo_(2)O_(4)nanosheets(NSs).Profiting from favorable elements composition and optimized structure property of decreased charge transfer barrier,more accessible active sites and increased oxygen vacancy concentration,the Ru-NiCo_(2)O_(4)NSs exhibits excellent OER activity with a low overpotential of 230 mV to reach the current density of 10 mA/cm^(2)and decent durability.Furthermore,Ru-NiCo_(2)O_(4)NSs show superior HER activity than the pristine NiCo_(2)O_(4)NSs,as well.When assembling Ru-NiCo_(2)O_(4)NSs couple as an alkaline water electrolyzer,a cell voltage of 1.60 V can deliver the current density of 10 mA/cm^(2).This work provides feasible guidance for improving the catalytic performance of spinel-based oxides. | Rui Yang Xuezhao Shi Yanyan Wang Jing Jin Hanwen Liu Jie Yin Yong-Qing Zhao Pinxian Xi | 2022 | Chinese Chemical Letters2022，33，11： | 1 |
| 6 | An electrochemical biosensor for ascorbic acid based on carbon-supported PdNinanoparticles显示文摘 | Xin Zhang Yang Cao Sha Yu Fengchun Yang Pinxian Xi | 2013 | Biosensors and Bioelectronics2013，，： | 1 |
| 7 | A turn-on fluorescent chemosensor for Cu 2+ in aqueous media and its application to bioimaging显示文摘 | Liang Huang Fengjuan Chen Pinxian Xi Guoqiang Xie Zhengpeng Li Yanjun Shi Min Xu Hongyan Liu Zhaorong Ma DeCheng Bai ZhengZhi Zeng | 2011 | Dyes and Pigments2011，，3： | 1 |
| 8 | Atomic-level correlation between the electrochemical performance of an oxygen-evolving catalyst and the effects of CeO_(2) functionalization显示文摘Herein,we prepared a bimetallic layered double hydroxide(FeCo LDH)featuring a dandelion-like structure.Anchoring of CeO_(2)onto FeCo LDH produced interfaces between the functionalizing CeO_(2)and the parent LDH.Comparative electrochemical studies were carried out.Onset potential,overpotential,and Tafel slope point to the superior oxygen-evolving performance of CeO_(2)-FeCo LDH with respect to FeCo LDH,therefore,demonstrating the merits of CeO_(2)functionalization.The electronic structures of Fe,Co,and Ce were analyzed by X-ray photoelectron spectroscopy(XPS)and electron energy loss spectroscopy(EELS)from which the increase of Co^(3+)and the concurrent lowering of Ce^(4+)were established.With the use of CeO_(2)-FeCo LDH,accelerated formation at a sizably reduced potential of Co-OOH,one of the key intermediates preceding the release of O_(2)was observed by in situ Raman spectroscopy.We now have the atomic-level and location-specific evidence,the increase of the active Co^(3+)across the interface to correlate the enhanced catalytic performance with CeO_(2)functionalization. | Yanyan Li Wen Luo Duojie Wu Qi Wang Jie Yin Pinxian Xi Yongquan Qu Meng Gu Xinyu Zhang Zhouguang Lu Zhiping Zheng | 2022 | Nano Research2022，15，4： | 1 |
| 9 | Construction and Application of Interfacial Inorganic Nanostructures显示文摘Interfacial nanostructured materials have stimulated extensive interests in the research areas of green energy production and conversion due to their unique structures and performance.These interfacial crystalline structures with rich intrinsic defects,such as oxygen vacancies,adatoms,grain bounda-ries,and substitutional impurities,have led to unique activities in a variety of catalytic reactions.The rational design and engineering development of the interfaces provide an attractive way to optimize the catalytic performance and finally improve the efficiency of energy conversion and storage.Herein,a comprehensive overview of interfacial inorganic nanostructures and their electrocatalytic applications are summarized,and some future challenge and opportunity have also been proposed. | Rui Wang Yicheng Wei Li An Rui Yang Linchuan Guo Zheng Weng Pengfei Da Wenqing Chen Jing Jin Jianyi Li Pinxian Xi | 2020 | Chinese Journal of Chemistry2020，38，7： | 0 |
| 10 | Applications of Rare Earth Promoted Transition Metal Sulfides in Electrocatalysis显示文摘With the rapid consumption of fossil fuels and the resulting environmental problems,researchers are working to find sustainable alternative energy and energy storage and conversion methods.Transition metal sulfur compounds have attracted extensive attention due to their excellent electrical conductivity,low cost,adjustable components and good electrocatalytic performance.As an alternative to noble metal catalysts,they have emerged as a promising electrocatalyst.However,their low catalytic activity and poor stability limit their large-scale practical applications.Rare earth elements,known as industrial vitamins,are widely used in various fields due to their special redox properties,oxygen affinity and electronic structure.Therefore,the construction of rare earth promoted transition metal sulfides is of far-reaching significance for the development of catalysts.Here,we review the applications of various rare earth promoted transition metal sulfides in energy storage and conversion in recent years,which focuses on three ways in rare earth promoted transition metal sulfide,including doping,interfacial modification engineering and structural facilitation.As well,these materials are used in electrochemical reactions such as OER,HER,ORR,CO_(2)RR,and so on,in order to explore the important role of rare earth in the field of electrocatalysis,the future challenges and opportunities. | Wei Shen Jiamin Zhu Yang Hu Jie Yin Yao Zheng Pinxian Xi | 2023 | Chinese Journal of Chemistry2023，41，14： | 0 |
| 11 | High-Effi ciency Catalytic Interface IrO x/CeO_(2)with Adsorbate Evolution Mechanism Boosts Oxygen Evolution Reaction in Acid Media显示文摘Oxygen evolution reaction(OER)in acid media has been intensively studied recently for its important role in proton exchange membrane electrolyzers.CeO_(2)-based nanomaterials have been widely used in various applications for their redox properties,oxygen vacancy,and surface activity.CeO_(2)-based nanocatalysts also exhibit superior catalytic performance in OER in acid media.Herein,we fabricated a highly effi cient catalytic interface between IrO x and CeO_(2)(IrO x/CeO_(2)),which showed a boosting OER activity with an overpotential of 217 mV at the current density of 10 mA/cm 2 and long-term stability for 10 h in 0.5 mol/L H_(2)SO_(4),which were better than those of many reported catalysts.The in situ diff erential electrochemical mass spectrometry results demonstrated that IrO x/CeO_(2)and the commercial IrO 2(IrO 2-com)followed the adsorbate evolution mechanism,whereas the pure CeO_(2)surface followed the lattice oxygen oxidation mechanism under the same conditions for OER.These indicated that the interface of IrO x and CeO_(2)improved mass transfer effi ciency and reactivity,which also prevented the lattice oxygen evolution in the CeO_(2)structure and protected the whole structure.This work fi nds a new way for OER in acid media catalyzed by CeO_(2)-based nanocatalysts and promotes the design strategy for other CeO_(2)-based nanostructures. | Hongyu Zhao Jie Yin Pinxian Xi | 2023 | Transactions of Tianjin University2023，29，5： | 0 |
| 12 | Precisely Control Relationship between Sulfur Vacancy and H Absorption for Boosting Hydrogen Evolution Reaction显示文摘Ef fective and robust catalyst is the core of water splitting to produce hydrogen.Here, we report an anionic etching method to tailor the sulfur vacancy(VS) of NiS_(2) to further enhance the electrocatalytic performance for hydrogen evolution reaction(HER). With the VS concentration change from 2.4% to 8.5%, the H* adsorption strength on S sites changed and NiS_(2)-VS 5.9% shows the most optimized H* adsorption for HER with an ultralow onset potential(68 m V) and has long-term stability for 100 h in 1 M KOH media. In situ attenuated-total-reflection Fourier transform infrared spectroscopy(ATR-FTIRS) measurements are usually used to monitor the adsorption of intermediates. The S-H* peak of the Ni S_(2)-VS 5.9% appears at a very low voltage, which is favorable for the HER in alkaline media. Density functional theory calculations also demonstrate the Ni S_(2)-VS 5.9% has the optimal |ΔG^(H*)| of 0.17 e V. This work offers a simple and promising pathway to enhance catalytic activity via precise vacancies strategy. | Jing Jin Xinyao Wang Yang Hu Zhuang Zhang Hongbo Liu Jie Yin Pinxian Xi | 2024 | Nano-Micro Letters2024，16，4： | 0 |
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