RSC Advances
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2020
·Vol. 10
·期 49
·29326-29335
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IF 3.119
Lili Zhang,Tingting Zhang,Kaiqing Dai,Liqing Zhao,Qinghe Wei,Bing Zhang,Xu Xiang
The development of bifunctional electrocatalysts based on highly efficient non-noble metals is pivotal for overall water splitting. Here, a composite electrode of Co3O4@CoWP is synthesized, where an ultrathin layer composed of Co3O4 nanoparticles is grown on CoWP nanowires supported on a carbon cloth (CC). The Co3O4@CoWP/CC electrode exhibits excellent electrocatalytic activity and improved kinetics towards both the oxygen and hydrogen evolution reactions (OER and HER). The Co3O4@CoWP/CC electrode achieves a current density of 10 mA cm−2 at a low overpotential of 269 mV for the OER and −10 mA cm−2 at 118 mV for the HER in 1.0 M KOH solution. The voltage applied to a two-electrode water electrolyzer for overall water splitting, while employing the Co3O4@CoWP/CC electrode as both an anode and a cathode, in order to reach a current density of 10 mA cm−2, is 1.61 V, which is better than that for the majority of reported non-noble electrocatalysts. Moreover, the Co3O4@CoWP/CC electrode exhibits good stability over 24 h with slight attenuation. The electrode benefits from the enhanced adsorption of oxygen intermediates on Co3O4 during the OER, the increased ability for water dissociation and the optimized H adsorption/desorption ability of CoWP nanowires during the HER. This study provides a feasible approach for cost-effective and high-performance non-noble metal bifunctional catalysts for overall water electrolysis.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Ke Li,Jun Xu,Chan Chen,Zhizhog Xie,Dan Liu,Deyu Qu,Haolin Tang,Qiang Wei,Qibo Deng,Junsheng Li,Ning Hu
Electrocatalytic hydrogen evolution reaction (HER) is a green approach to produce high-quality hydrogen fuel . Developing efficient electrocatalyst is the key to realize cost-effective HER. Pt is the state-of-the-art HER catalyst so far. However, the use of Pt for HER is limited by its high cost. Thus, it is essential to lower down the usage of Pt in the electrocatalyst by improving the intrinsic activity of Pt. In this work, we propose to achieve this goal by introducing synergistic interaction between Pt and substrate material (NiS 2 ). The favorable synergy interaction can modify the d band structure of Pt (1 1 1) facet and modulate the hydrogen adsorption on Pt (1 1 1), which enhances the intrinsic electrocatalytic activity of Pt. The effectiveness of this strategy is demonstrated with both experimental and theoretical investigations.
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ACS Applied Materials & Interfaces
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2020
·
IF 8.758
Xiaoling Sun,Qiaojuan Gong,Yunxia Liang,Mingjie Wu,Nengneng Xu,Pengni Gong,Shuhui Sun,Jinli Qiao
Rational synthesis of bifunctional electrocatalysts with high performance and strong durability is highly demanded rechargeable metal–air battery. In this work, ZIF-derived Co9S8/C coated with conductive graphene nanosheet (Co9S8/GN) was synthesized by a simple solvothermal method and formed a stable double-carbon structure. As expected, the prepared Co9S8/GN catalyst exhibits a high catalytic activity (ΔE: 0.88 V) and long-term durability toward both oxygen reduction reaction and oxygen evolution reaction (ORR and OER), which is even superior to the Pt/C + Ir/C mixture (0.91 V). In addition, the Zn–air battery with the Co9S8/GN catalyst showed higher power density (186 mW cm–2) and more stable charge–discharge cycling performances (2000 cycles) than the Pt/C + Ir/C (118 mW cm–2). Based on these analysis results, the favorable catalytic performance of ORR/OER should be illustrated by the following reasons: (i) large specific surface area and unique mesoporous structure, providing abundant active sites; (ii) good conductivity, accelerating the electrons transfer; and (iii) the unique stable “double-carbon” structures (metal–S–C–C), preventing the agglomeration of metal sulfide, building new quick transfer pathway, and forming the strong electron coupling ability and synergistic effect.
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Journal of Energy Chemistry
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2020
·
IF 7.216
Wei Liu,Peng Geng,Shiqing Li,Wenhui Liu,Dayong Fan,Huidan Lu,Zhenhuan Lu,Yongping Liu
Modulate the electronic structure and surface energy by nanostructure and heteroatom doping is an efficient strategy to improve electrocatalytic activity of hydrogen evolution reaction (HER). Herein, nickel incorporated WP 2 self-supporting nanosheet arrays cathode was synthesized on carbon cloth (Ni-WP 2 NS/CC) by in-situ phosphating reduction of the Ni-doped WO 3 . It shows that heteroatom doping and the three-dimensional (3D) nanosheet arrays morphology both facilitate to reduce the interfacial transfer resistance and increase electrochemical-active surface areas, which effectively improve electrocatalytic hydrogen evolution reaction (HER) activity. The optimized catalyst, 1% Ni-WP 2 NS/CC, exhibits an outstanding electrocatalytic performance with an overpotential of 110 mV at 10 mA cm −2 and a Tafel slope of 65 mV dec −1 in the acid solution. DFT calculations further demonstrate the nickel doping can adjust the intrinsic structure of electronics, lower the Gibbs free energy of adsorption of hydrogen (Δ G H* ), and effectively improve the HER performance.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
·
IF 7.489
Ying Gao,Yihui Wu,Hanwei He,Wenyu Tan
Development of cost-effective and efficient earth-abundant catalysts for hydrogen evolution reaction (HER) is a great challenge. In this study, by one-step potentiostatic electrodeposition, the Ni–Se–Cu electrocatalyst on nickel foam was fabricated as a binder-free HER electrocatalyst. As compared with Ni–Se electrocatalysts, such fabricated Ni–Se–Cu electrocatalyst exhibited prominent electrocatalytic activity to the HER in alkaline electrolyte. This Ni–Se–Cu electrocatalyst exhibits a small overpotential of 136 mV to achieve a current density of 10 mA·cm −2 and high electrochemical stability. The remarkable HER properties of Ni–Se–Cu electrocatalyst mainly originate from high electronic conductivity induced by Cu-doping. This work shows a cheap and simple avenue to develop high efficient non-noble electrochemical electrocatalysts for HER.
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ACS Sustainable Chemistry & Engineering
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2020
·
IF 7.632
Qingqing Zha,Mingxia Li,Zihao Liu,Yonghong Ni
Metal–organic frameworks (MOFs) have attracted much interest in electrocatalysis as promising catalysts in recent years. However, it still remains a challenge to directly use MOF-based materials as bifunctional electrocatalysts for overall water splitting. Herein, a hierarchical Co,Fe-MOF-74/Co/carbon cloth (CC) three-layer hybrid electrode is synthesized by a simple electrochemical deposition technology with subsequent solvothermal treatment. Electrochemical performance investigations show that the as-constructed Co,Fe-MOF-74/Co/CC electrode exhibits impressive electrocatalytic activity for full water splitting, which only requires a low overpotential of 226 mV@20 mA cm–2 for the oxygen evolution reaction (OER) and 94 mV@–10 mA cm–2 for the hydrogen evolution reaction (HER), respectively. Employing the as-constructed electrode as the anode and cathode in a two-electrode setup simultaneously, only 1.65 V of the voltage is needed to deliver the current density of 20 mA cm–2. The above excellent electrochemical performances should be attributed to the specific architecture, the synergistic effect of the Co and Fe species, and the superhydrophilic surface of the catalyst. More importantly, further investigations uncover that metal hydroxides and oxyhydroxides produced in situ during electrochemical tests are the veritable active species, which promote the high catalytic activity of the present catalyst.
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Fan Zhang,Renjie Ji,Yonghong Liu,Zhijian Li,Zheng Liu,Shuaichen Lu,Yating Wang,Xinlei Wu,Hui Jin,Baoping Cai
Exploring the low-cost and high-efficient electrocatalysts with Pt-like activity for alkaline hydrogen evolution through water splitting is imperative yet challenging. Herein, a simple synthesis combined with electrodeposition and facile electro-oxidation is developed to construct the hollow dendritic self-supported electrode (HDSE). X-ray photoelectron spectroscopy (XPS), X-ray absorption fine structure (XAFS), and electron paramagnetic resonance (EPR) reveal that the surface of HDSE contains the abundant NiO, which is further decorated by fluorine (F)-doped and oxygen vacancies after electro-oxidation process. The resultant HDSE achieves an excellent electrocatalytic performance for hydrogen evolution reaction (HER) in alkaline condition, leading to the extremely low overpotential of 13 mV to drive a current density of −10 mA·cm −2 , and exhibits the long-time stability at the current density of −100 mA·cm −2 and −500 mA·cm −2 , which is superior to the electrocatalytic ability of Pt/C. Density functional theory (DFT) calculations illustrate the NiO modulated by F-doping and oxygen vacancy, could synergistically improve the charge distribution, enhance the conductivity of NiO structure, and optimize the adsorption energy for intermediates of HER, thus accelerating the electrocatalytic ability for hydrogen evolution. This work opens up a new avenue toward the reasonable design of high-efficient and low-cost electrocatalysts for alkaline hydrogen evolution reaction.
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Sustainable Energy & Fuels
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2020
·Vol. 4
·期 6
·2775-2781
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IF 5.503
Lingjie Li,Liu Cao,Qiudong He,Bo Shang,Jinlong Chen,Jinglei Lei,Nianbing Li,Fusheng Pan
To improve the electrocatalytic performance of CuCo hybrid oxides, here we report a novel and facile strategy to simultaneously tailor the morphology and electronic structure of CuCoOx by incorporation of CeO2. The as-synthesized CeO2-CuCoO/NF shows urchin-like morphology that is composed of numerous nanofibers, endowing the surface with superaerophobicity and massive active sites. Density functional theory calculation elucidates the crucial role of CeO2 in boosting the electron transfer and decreasing the free energy of intermediates during water splitting. As expected, CeO2-CuCoO/NF shows attractive bifunctional electrocatalytic activity with overpotentials of 266 and 93 mV at 10 mA cm−2 for oxygen and hydrogen evolution reactions in 1 M KOH, respectively, which are superior to most reported catalysts. A water-splitting electrolyzer consisted of CeO2-CuCoO/NF electrodes as both anode and cathode displays better performance than the noble-metal counterpart IrO2/NF‖Pt/C/NF. The present work undoubtedly sheds new insight on designing advanced bifunctional catalysts for practical water splitting.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
·
IF 14.229
Ge Ma,Qi Xue,Jingyi Zhu,Xiaoyu Zhang,Xin Wang,Hongchang Yao,Guofu Zhou,Yu Chen
Heterostructured noble metal/transition metal nanohybrids have attracted increasing attention in energy/environment-related electrocatalysis field due to their high activity. In this work, the ultrathin NiO nanosheets (NiO-NSs) decorated with ultrafine Rh nanocrystals (Rh-NCs) electrocatalyst (termed as Rh-NCs/NiO-NSs) is successfully synthesized by using mixed-cyanogels-NaBH 4 method and succedent heat treatment. Physical characterizations confirm that as-prepared Rh-NCs/NiO-NSs have 1.6 nm thickness and a large specific surface area of 166.2 m 2 g −1 , and ultrafine Rh-NCs are uniformly dispersed on surface of NiO-NSs. Electrochemical measurements show that the incorporation of Rh-NCs can promote the generation of Ni III OOH species and accelerate the oxidation of CO, thus significantly improving the electrocatalytic performance of NiO-NSs for urea electro-oxidation reaction (UEOR). The UEOR current at Rh-NCs/NiO-NSs achieves the 616 mA mg −1 at 1.55 V potential, which is 11.5 times bigger than that at NiO-NSs in 1 M KOH solution with 0.33 M urea. Additionally, Rh-NCs/NiO-NSs also show excellent long-term stability due to improved structural/chemical stability and anti-poisoning capability.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
·
IF 6.361
Hong-Yan Chen,Hua-Jie Niu,Xiaohong Ma,Jiu-Ju Feng,Xuexiang Weng,Hong Huang,Ai-Jun Wang
Exploring hydrogen evolution reaction (HER) catalyst with highly catalytic features in alkaline conditions is considered as significance for water splitting. In this study, a general and simple method was developed to prepare flower-like platinum-cobalt-ruthenium alloy nanoassemblies (PtCoRu NAs) by using murexide and cetyltrimethylammonium chloride (CTAC) as the co-structure-directing agents. Benefiting from the structural advantages and multimetallic compositions , the as-prepared PtCoRu NAs displayed remarkably enhanced electrocatalytic performance for the HER in 1.0 M KOH, with a low overpotential (η, 22 mV) to drive 10 mA cm −2 , small Tafel slope (46 mV dec −1 ), and high exchange current density ( j 0 , 3.30 mA cm −2 ) during the long-term electrolysis. The as-developed strategy sheds some valuable guidelines for preparing advanced multimetallic catalysts for production of hydrogen in fuel cells.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Jianguo Yu,Dan Wei,Zhe Zheng,Wenjie Yu,Honghui Shen,Yuning Qu,Shuya Wen,Young-Uk Kwon,Yongnan Zhao
x%Pt-Naf-CV (Pt-Nafion-Cyclic Voltammetry) catalysts with homogeneously distributed platinum nanoparticles and ultra-low Pt loading are successfully synthesized by using a facile potential cycling approach. The as-synthesized 0.8%Pt-Naf-CV catalyst exhibits an enhanced electrocatalytic activity for hydrogen evolution reaction (HER) in 0.5 M H 2 SO 4 solution, which obtains a low overpotential of 34 mV at 10 mA cm −2 . The linear sweep voltammetry (LSV) curve of 0.8%Pt-Naf-CV catalyst is almost consistent with that of commercial Pt/C. However, the 0.8%Pt-Naf-CV catalyst displays a more excellent stability and durability in comparison with commercial Pt/C. Besides, the Pt loading of Pt/C (Pt–10 wt%) is about 10 times that of 0.8%Pt-Naf-CV catalyst. The improved electrocatalytic performances are derived from the synergistic effects of Pt and Nafion. The Nafion plays a significant role as a dispersant , carrier and structure directing agent on the morphology and size of the Pt catalyst. This result contributes a promising method to enhance the catalytic activity and reduce the amount of Pt.
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Chemistry-An Asian Journal
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2019
·Vol. 15
·期 1
·98-105
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IF 3.698
Guohong Ren,Zhicheng Zhang,Yajun Liu,Ying Liang,Xichen Zhang,Shishan Wu,Jian Shen
Graphical Quaternary PtPdAuTe nanowires (NWs) with a rough surface were synthesized through a template method, and different atomic-ratio NWs were obtained by adjusting the amount of precursors. Electrochemical tests show that NWs have excellent activity for methanol oxidation. Multicomponent Pt-based nanowires (NWs) have attracted widespread attention as eletrocatalysts toward direct alcohol fuel cells because of their unique one-dimensional structure and high reaction dynamics. Quaternary PtPdAuTe NWs are designed via a facile template method, and NWs with a different composition are obtained by adjusting the feed ratio of metal precursors. The direct displacement reaction of metal precursors with Te NWs and the partial oxidation of Te lead to the formation of quaternary NWs. The rough surface and abundant reactive sites deriving from the rearrangement of metal atoms on the Te NWs surface endow the PtPdAuTe NWs with a superior electrocatalytic property and durability for methanol oxidation. The Pt 20 Pd 20 Au 10 Te 50 NWs display the largest mass activity and best stability among all catalysts. The preparation of PtPdAuTe NWs could provide a viable strategy for the preparation of other multicomponent NWs.
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