TRANSITION METAL CHEMISTRY
·
2023
·Vol. 48
·期 2
·125-133
·
IF 1.7
Hu Yi,Xu Jingsong,Zhang Tianzhu,Zhong Hang,Chen Jun,Liu Xinai,Pan Qifa,Liu Ruidong,Jiang Chunli,Chen Jun
Electrocatalytic water splitting to produce hydrogen is a promising route to provide green hydrogen on a large scale. To explore non-noble metal electrocatalysts with high performance is still a challenge. Herein, a one-step electrodeposition way is developed to construct the heterostructural (NiO-La 2 O 3 )/(Ni-La)/NiO/Ni electrocatalysts on Ni foam. The dark Ni-La coating was prepared by co-electrodeposition from an aqueous solution containing LaCl 3 and NiCl 2 with a molar concentration ratio of 1:5. Among these heterostructural Ni-based electrocatalysts, an excellent HER activity is achieved: an overpotential of 22 mV at the current density of 10 mA cm −2 in 1 M KOH solution. It is demonstrated that the introduction of La significantly reduces the overpotential for HER. The higher the La content in the Ni-La coating of these electrocatalysts, the better the electrocatalytic HER performance was exhibited. This work provides a facile and inexpensive route to prepare Ni-La coating on electrodes in an aqueous solution.
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ACS Applied Energy Materials
·
2023
·
IF 6.4
Zeqing Hu,Rong Wei,Chen Yan,Han Wan,Yu Liu,Longjiu Cheng,Zhou Li,Jiming Song
In this work, carrier concentration optimization and effective mass increase of Cu2GeSe3, which were considered to be a synergetic effect of electrical transport properties, were achieved by the co-doping of Bi and Zn on the Cu site. This effect led to a higher Seebeck coefficient of ∼307.76 μV K–1 at 723 K for the Cu1.988Bi0.01Zn0.002GeSe3 sample. This effect also resulted in a higher power factor of ∼8.66 μW cm–1 K–2 at 723 K and an average power factor of ∼6.29 μW cm–1 K–2 at the temperature range of 303–723 K for the Cu1.988Bi0.01Zn0.002GeSe3 sample, which were ∼135 and ∼196% larger than those of pristine Cu2GeSe3, respectively, and are among the highest value of the Cu2GeSe3-based sample. Benefiting from simultaneous optimization of the power factor, the maximum ZT of ∼0.75 for the Cu1.988Bi0.01Zn0.002GeSe3 sample at 723 K was obtained, which is ∼288% higher than that of Cu2GeSe3.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Dongdong Xu,Zhigao Xue,Lei Han,Kai Tao
Bimetallic sulfides with superior electrochemical activity are extensively explored as electrode materials for electrochemical energy related applications. However, their utilizations are impeded due to unfavorable faradaic reaction kinetics and poor electrochemical stability. To overcome these defects, this study reports interface engineering of heterogeneous nanosheet arrays on Ni foam (NF) through surface modification of metal-organic framework (MOF)-derived zinc cobalt sulfide (Zn/Co-S) with CeO 2 nanoparticles (NPs). MOF-derived porous Zn/Co-S nanosheets have highly exposed electrochemical active sites and abundant channels for charge transport. The strong interfacial coupling between Zn/Co-S and defective CeO 2 leads to fast charge transfer, thereby improving electrochemical activity. The CeO 2 can also prevent Zn/Co-S from degrading in KOH solution. Moreover, the self-supported electrode shows high electronic conductivity and strong adhesion with the conductive substrate. Therefore, the specific capacity and electrochemical stability of resulting Zn/Co-S@CeO 2 /NF are significantly higher compared with Zn/Co-S/NF. Furthermore, an asymmetric supercapacitor (ASC) based on Zn/Co-S@CeO 2 /NF and activated carbon (AC) exhibits high energy storage capability (42.4 Wh kg −1 ) and outstanding operating durability (91.1 % after 8000 cycles). These results demonstrate that the as-prepared electrode is a superior candidate for electrochemical devices .
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Small
·
2023
·Vol. 19
·期 20
·2207569
·
IF 13.3
Yakun Tian,Ming Wen,Aijian Huang,Qingsheng Wu,Zhiguo Wang,Quanjing Zhu,Tao Zhou,Yongqing Fu
High stability and efficiency of electrocatalysts are crucial for hydrogen evolution reaction (HER) toward water splitting in an alkaline media. Herein, a novel nano-Pt/Nb-doped Co(OH) 2 (Pt/Nb Co(OH) 2 ) nanosheet is designed and synthesized using water-bath treatment and solvothermal reduction approaches. With nano-Pt uniformly anchored onto Nb Co(OH) 2 nanosheet, the synthesized Pt/Nb Co(OH) 2 shows outstanding electrocatalytic performances for alkaline HER, achieving a high stability for at least 33 h, a high mass activity of 0.65 mA µg −1 Pt, and a good catalytic activity with a low overpotential of 112 mV at 10 mA cm −2 . Both experimental and theoretical results prove that Nb-doping significantly optimizes the hydrogen adsorption free energy to accelerate the Heyrovsky step for HER, and boosts the adsorption of H 2 O, which further enhances the water activation. This study provides a new design methodology for the Nb-doped electrocatalysts in an alkaline HER field by facile and green way.
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MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Mengyao Liu,Taotao Gao,Hongmei Li,Bo Xie,Chunqiong Hu,Yong Guo,Dan Xiao
Based on the incidence of diabetes, developing glucose sensors of superior performance with low-cost transition metals (TMs) has been the direction of many researchers, amorphous TMs with highly efficient electrocatalytic properties have attracted our interest. On this basis, amorphous nickel–cobalt bimetallic N -doped carbon nanoparticles on carbon cloth (a-Ni 2 /Co 1 -NC/CC) were fabricated from ZIF-8, which was then used to fabricate an enzyme-free glucose sensor. It was found that the a-Ni 2 /Co 1 -NC/CC had the best response to glucose in 0.4 M NaOH at 0.55 V (vs Hg/HgO). As compared to crystal Ni 2 /Co 1 nanoparticle on carbon cloth (c-Ni 2 /Co 1 NPs/CC), cyclic voltammetry (CV) and chronoamperometry studies revealed that the a-Ni 2 /Co 1 -NC/CC showed a significant increase in the efficient of electrochemical oxidation of glucose under optimal conditions, exhibiting a high sensitivity of 2.455 mA mM −1 cm −2 with a low detection limit of 0.15 μM (S/N = 3). Furthermore, the constructed sensor based on a-Ni 2 /Co 1 -NC/CC also has long-term stability and can be used to detect glucose accurately in beverages (pure milk, coffee drinks, tea drinks, and soda water) with reasonable recovery from 95.6 % to 105.6 %. This study provides a simple and feasible method for the construction of a highly sensitive non-enzyme glucose electrochemical sensor based on amorphous TMs.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Liuxin Xu,Ya Pan,Hongmei Li,Ruichao Xu,Zhihu Sun
The presence of interfacial sites between Pt-group metals and transition metal oxides can effectively improve the catalytic activity of Pt-group catalysts, but under moisture-rich conditions they suffer from severe deactivation due to water poisoning of the active sites. Here, we propose for the first time a Lanthanum (La)-doping strategy to improve the water-resistance of the Pt-based catalysts. We synthesized a Pt-CoO/Al 2 O 3 catalyst that is active for CO oxidation under dry conditions but deactivates rapidly under moisture. This rapid deactivation is overcome by La-doping, which delivers boosted activity (100 % CO conversion at 15 °C) and long-term on-stream stability. In situ X-ray absorption fine-structure and in situ diffuse reflectance infrared Fourier transform spectra revealed that the doped La, in the form of La 2 O 3 , plays dual roles of suppressing the carbonate formation on the active sites and modifying the electronic structure of Pt. The synergetic effects between La 2 O 3 and the active Pt−O−Co interfacial sites in La-doped Pt-CoO/Al 2 O 3 lead to the outstanding activity under the moisture-rich condition.
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Crystals
·
2023
·Vol. 13
·期 3
·460
·
IF 2.7
Danni Huang,Tong Xiao,Beibei Fu,Shoulei Xu,Yuyang Huang,Wen Deng,Zhukun Zhou
ZrO2is an attractive host matrix for luminescence material because of its excellent physical properties, such as low phonon energy and wide band gap. In this work, the highly transparent Tm2O3and Yb2O3co-doped yttria stabilized zirconia (YSZ) (abbreviated as Yb/Tm: YSZ) single crystals were grown by the optical floating zone method. The Yb/Tm: YSZ samples were stabilized in the cubic phase at room temperature when Yb3+and Tm3+replaced Y3+. The influence of Yb3+co-doping on the up-conversion luminescence properties of the crystals was systematically studied. A total of 0.5 mol% Tm2O3and 2.0 mol% Yb2O3co-activated YSZ single crystal (abbreviated as 2.0Yb/Tm: YSZ) has the maximum luminous intensity. There were seven absorption peaks located at around 358, 460, 679, 783.3, 850–1000, 1200, and 1721.5 nm that were observed in the absorption spectrum of the 2.0Yb/Tm: YSZ single crystal. There were three up-conversion peaks at around 488, 658 and 800 nm that were observed when the Yb/Tm: YSZ samples were excitated at 980 nm. The fluorescence lifetime of Tm3+for the1G4→3H6transition of the 2.0Yb/Tm: YSZ sample is 7.716 ms as excited with a 980 nm laser. In addition, the oscillator strength parameters Ωλ(λ = 2, 4 and 6) of this sample were derived by the Judd–Ofelt theory to evaluate the laser performance of the host materials. The ratio Ω4/Ω6of this sample is 0.80, implying its excellent laser output. Therefore, the 2.0Yb/Tm: YSZ single crystal is a considerable potential material for laser and luminescence applications.Keywords:YSZ single crystal;Yb3+and Tm3+co-activated;optical floating zone method;up-conversion luminescence;Judd–Ofelt theory
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2023
·Vol. 27
·期 5
·1261-1268
·
IF 2.5
Deng Hao-chen (Preston),Hao Qingzhu,Wang Yuhang
The COVID-19 pandemic that is still prevalent around the globe each day consumes massive disposable face masks and consequently lays a heavy burden on waste management. Meanwhile, the incineration of these medical wastes further escalates the already overwhelming carbon emission that leads to global warming and climate change. To offer a potential solution addressing medical waste and CO 2 emission challenges, we herein develop a synthetic protocol to upgrade face masks into Ni, N-doped graphene (Ni–N-C) sheet catalysts for selectively reducing CO 2 into CO electrochemically. The high specific surface area and the uniform dispersion of Ni active sites of the catalyst derived from a regular disposable face mask enable a near-unity CO Faradaic efficiency (FE) at the current density of 200 mA cm −2 . This study offers outside-of-the-box thinking to address environmental issues by turning medical wastes into CO 2 reduction catalysts.
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Chem
·
2023
·
IF 23.5
Wenchao Ma,Shunji Xie,Biao Zhang,Xiaoyang He,Xi Liu,Bingbao Mei,Fanfei Sun,Zheng Jiang,Li Lin,Qinghong Zhang,Bin Ren,Gang Fu,Xile Hu,Ye Wang
Electrocatalytic upgrading of CO to value-added multi-carbon (C 2+ ) compounds is a promising approach to efficient carbon utilization. However, current full-cell systems have low energy conversion efficiencies under practical conditions due to the requirement of high cell voltages for an industrially relevant current density. Here, we present a lattice tension strategy to enhance CO chemisorption and carbon–carbon coupling on copper catalysts at high CO coverages, which usually cause excessive dipole-dipole repulsion and are detrimental to C–C coupling. A current density of 1.0 A cm −2 with 84% Faradaic efficiency of C 2+ compounds is achieved at 2.4 V on a spindle-shaped copper with 4% lattice tension. The C 2+ products are formed with nearly 100% selectivity and in a 41% single-pass yield (on a molar carbon basis). This work demonstrates a great potential of electrocatalytic CO reduction for the practical synthesis of high-value chemicals from CO 2 and abundant carbon resources.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Hao Zhang,Guanghui Guo,Ziyue Wang,Qian He,Xiaohui He,Hongbing Ji
Cost-effective catalysts for the complete oxidation of formaldehyde (HCHO) are essential for indoor air purification and human health. Here, we report a precursor atomization strategy to synthesize cobalt single-atom catalysts (Co SACs), and the Co SACs show complete conversion of 50 ppm HCHO at room temperature and the catalysts are stable during at least 120 h. The HCHO oxidation activity of Co SACs outperforms all the reported non-noble catalysts at room temperature. DFT calculations and isotope experiments reveal the mechanism of HCHO removal over Co SACs that the decomposition of formate intermediates is the kinetically rate-determining step. The excellent formate intermediate decomposition ability of Co SACs is the key factor in achieving excellent HCHO oxidation performance. Considering the facile and versatile SACs synthesis approach, remarkable performance in HCHO abatement, as well as cheap cost, it is believed that this study may open a window for Co SACs industrial application.
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JOURNAL OF MATERIALS RESEARCH
·
2023
·Vol. 38
·期 9
·2359-2368
·
IF 2.7
Ma Junjie,Liu Hangcheng,Tao Zeyu,Liu Jianfeng,Yuan Binxia,Pan Weiguo,Shi Zhengrong
In order to reveal the relationship between the structure and the electrochemical oxygen reduction reaction (ORR) activity of different double transition metal decorated catalysts, three different double transition metal and N co-doped carbon material cathode catalyst materials (FeCo–NC, FeNi–NC and CoNi–NC) were prepared in this study. The FeCo–NC catalysts synthesised in this study still showed high ORR activity under alkaline conditions, with a half-wave potential of 0.783 V RHE , a mass activity (MA) of 11.36 A/g (0.77 V RHE ) and an ultimate current density of − 4.46 mA cm −2 ; after 30,000 cycles, the half-wave potential only decreased to 99.3% of the initial potential. Meanwhile, we employ MS to establish three different double transition metal and N co-doped graphene catalysts and to calculate and analyse their desorption properties, leading to the FeCo–NC material being the model with the highest ORR activity, which is consistent with the experimental results. Graphical Abstract
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Chemistry-An Asian Journal
·
2023
·Vol. 18
·期 10
·e202300150
·
IF 4.1
Lianghao Song,Jing Zhang,Chengyu Huang,Chenfei Zhao,Xuemin Yin,Hongli Long,Yang Liu,Yufeng Zhao
Graphical A novel ZIF-assisted strategy was developed to synthesize Co nanoparticles loaded on mesoporous N-doped carbon support of hollow cubic nanobox constructed by pyrolysis of TA-treated ZIF-67 at high temperature. The Co−NC-800 NBs-based ZABs present higher power density and better stability than commercial Pt/C catalysts. Design of non-noble metal electrocatalysts with high catalytic activity and stability to replace commercial Pt/C is crucial in the commercialization development of Zn-air batteries (ZABs). In this work, Co catalyst nanoparticles coupled with nitrogen-doped hollow carbon nanoboxes were well designed through zeolite-imidazole framework (ZIF-67) carbonization. As a result, the 3D hollow nanoboxes reduced the charge transport resistance, and the Co nanoparticles loaded on nitrogen-doped carbon supports exhibited excellent electrocatalytic performance for oxygen reduction reaction (ORR, E 1/2 =0.823 V vs . RHE), similar to that of commercial Pt/C. Moreover, the designed catalysts showed an excellent peak density of 142 mW cm −2 when applied on ZABs. This work provides a promising strategy for the rational design of non-noble electrocatalysts with high performance for ZABs and fuel cells.
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