NANOTECHNOLOGY
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2023
·Vol. 35
·期 10
·105702
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IF 3.5
Xuefeng Zhang,Qin Yang,Longcheng Zhang,Jun Li,Shengjun Sun,Yingchun Yang,Yuntong Sun,Xuping Sun
Seawater splitting is a compelling avenue to produce abundant hydrogen, which requires high-performance and cost-effective catalysts. Constructing bimetallic transition metal phosphides is a feasible strategy to meet the challenge. Here, an amorphous Co–Mo–P film supported on nickel foam (Co–Mo–P/NF) electrode is developed with bifunctional properties for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline seawater. Corresponding results indicate that the introduction of Mo can improve the active sites and regulate the intrinsic activity. Such a Co–Mo–P/NF behaves with prominent electrocatalytic activity towards both HER and OER, demanding low overpotentials of 193 and 352 mV at 100 mA cm‒2 in alkaline seawater, respectively. Furthermore, the assembled electrolyzer demands a pronounced overall seawater splitting activity with a low cell voltage of 1.76 V to deliver 100 mA cm−2 presenting excellent durability without obvious attenuation after 24 h continuous stability test. This work expands the horizon to develop transition metal-phosphorus electrocatalysts with robust and efficient activity for overall seawater splitting.
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-9
·
IF 16.6
Li Bo,Cai Chuanyang,Liu Yang,Wang Fang,Yang Bin,Li Qikai,Zhang Pengxiang,Deng Biao,Hou Pengfei,Liu Weishu
Ferroelectric polymers have great potential applications in mechanical/thermal sensing, but their sensitivity and detection limit are still not outstanding. We propose interface engineering to improve the charge collection in a ferroelectric poly(vinylidene fluoride-co-trifluoroethylene) copolymer (P(VDF-TrFE)) thin film via cross-linking with poly(3,4-ethylenedioxythiophene) doped with polystyrenesulfonate (PEDOT:PSS) layer. The as-fabricated P(VDF-TrFE)/PEDOT:PSS composite film exhibits an ultrasensitive and linear mechanical/thermal response, showing sensitivities of 2.2 V kPa −1 in the pressure range of 0.025–100 kPa and 6.4 V K −1 in the temperature change range of 0.05–10 K. A corresponding piezoelectric coefficient of −86 pC N −1 and a pyroelectric coefficient of 95 μC m −2 K −1 are achieved because more charge is collected by the network interconnection interface between PEDOT:PSS and P(VDF-TrFE), related to the increase in the dielectric properties. Our work shines a light on a device-level technique route for boosting the sensitivity of ferroelectric polymer sensors through electrode interface engineering.
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Electrocatalysis
·
2023
·Vol. 14
·期 5
·776-787
·
IF 3.1
Zheng Yingping,Yu Dehua,Zhang Ke,Xu Wei,Ma Kaili,Wang Yuhang,Lou Yongbing
As a representative anodic reaction, the oxygen evolution reaction (OER) is often combined with hydrogen evolution, carbon dioxide reduction, and other cathodic reactions. Bimetallic selenides can satisfy the requirement of efficiency and economy for OER. However, the OER performance of Fe-Co-Se is less than satisfactory, restricted by the limited inherent active sites. Therefore, by doping P into Fe-Co-Se, the electron density and mass transfer were successfully adjusted. The 3D dandelion-like flower Fe-Co-Se-P/CC showed η 10 of 210 mV and the 45.3 mV dec −1 Tafel slope better than Fe-Co-Se/CC and RuO 2 . Experimental investigations demonstrated that outstanding OER activity was ascribed to the double modulation influences of P dopant both in electron environment and morphology which could not only improve conductivity but also enrich catalytic reactive sites. This work presents another choice for the design of a transition metal OER catalyzer and propels the development of electrocatalytic oxygen production to higher efficiency and lower cost. Graphical Abstract 3D dandelion-like flowers Fe - Co-Se-P structure anchored on carbon cloth has been firstly synthesized as economy and efficient OER electrocatalyst, which displays outstanding catalytic perform ance (equipped with 210 mV low overpotential at η 10 ) and stability benefited from the double modulation effect of P doping on the electronic environment and morphology.
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Journal of Physical Chemistry C
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2023
·
IF 3.7
Yumiao Dong,Qinhui Xie,Shuo Wu,Junbo Li,Lei Sun,Wei Ji
p-Mercaptobenzoic acid (4-MBA) is a typical molecular probe for a surface-enhanced Raman scattering (SERS) study of the enhancement performance of semiconductor nanoparticles. Understanding the molecular adsorption mechanism of 4-MBA on a semiconductor surface is crucial to reveal the enhancement mechanism of semiconductor SERS. Herein, two types of submicrometer-sized TiO2 particles with amorphous (denoted as a-TiO2) and anatase structures (denoted as c-TiO2) were fabricated, and their potential as SERS-active substrates with high electric-field enhancement was explored based on the near-field scattering theory and finite-element method simulation. The electric field-enhanced semiconductor SERS provide a better vision for us to study the adsorption modes of molecules on the TiO2 surface. On this basis, adsorption behaviors of 4-MBA on a-TiO2 and c-TiO2 particles were systematically studied by the semiconductor SERS and density functional theory. The results demonstrated that the adsorption mechanism of 4-MBA with TiO2 surfaces is highly dependent on the exposure of acid sites of TiO2 surfaces. 4-MBA adsorbs preferentially on Brønsted acid sites of a-TiO2 through a carboxyl group, in contrast on Lewis acid sites of c-TiO2 through a sulfhydryl group. Furthermore, 4-MBA molecules may form multilayer adsorption on TiO2 surfaces through the hydrogen bond and/or π–π stacking interaction. Research results not only provide a new insight to re-evaluate the chemical enhancement mechanism for TiO2–4-MBA systems but also provide a theoretical guidance for the modification of TiO2 surface with organic molecules containing carboxyl and sulfhydryl groups.
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Journal of Energy Storage
·
2023
·
IF 9.4
Fengzhao Hua,Yunqiang Zhang,Shilei Cao,Mei Li,Laiying Jing,Jiaxi Cui
Conductive polyaniline (PANI) is considered as a promising cathode material for aqueous zinc-ion batteries (AZIBs) due to its reversible redox properties. In this study, we prepared a binder-free PANI ( β PG-PANI-6) cathode co-doped with β -naphthalene sulfonic acid ( β -NSA), HClO 4 , and graphitic acid (GA) via a layer-by-layer self-assembled electro-polymerization method. As a soft template, β -NSA micelles can be doped with HClO 4 into PANI nanoparticles to prevent the tight accumulation of PANI chains. Moreover, β -NSA and GA adsorbed on the surface of PANI nanoparticles through layer-by-layer self-assembly contain abundant weak acid groups, which can act as internal proton reservoirs to offer protons to guarantee high redox activity. During the electro-polymerization process, the flexible GA matrix which forms N O bond closely with PANI can alleviate the volume expansion effect of PANI. As a result, the β PG-PANI-6 cathode can obtain superior discharge specific capacity (560.5 mAh/g, 0.2 A/g), excellent rate performance (251.3 mAh/g, 10 A/g). It is commendable that the AZIBs assembled by β PG-PANI-6 cathode deliver ultra-high energy density and power density (535.31 Wh/kg @ 187.16 W/kg, 184.45 Wh/kg @ 7378.01 W/kg). This study expands the doping chemistry of PANI and advances the development of conducting polymer for AZIBs to a new level.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Zhentao Li,Yanhui Fu,Qingsheng Zhu,Saijin Wei,Jie Gao,Yifu Zhu,Ting Xue,Ling Bai,Yangping Wen
Phosphorene (BP) is a rapidly rising star in two-dimensional (2D) layered nanomaterials beyond graphene, and its urgent issues of ambient instability still have to be resolved. Here, the bimetallic Pt-Pd nanoparticle on the BP surface was employed as multifunctional chemical and biochemical sensing platform for electrocatalytic detection of p -aminophenol (PAP), β-galactosidase (β-Gal), and Escherichia coli ( E. coli ). The BP-supported Pt-Pd nanoelectrocatalyst obtained by the electrodeposition of bimetallic Pt-Pd nanoparticle onto the BP surface was very stable in aqueous buffer containing oxygen, which displayed good voltammetric responses for PAP in a linear range of 0.02 -5 μmol·L -1 with a detection limit (LOD) of 1.41 × 10 −8 M and sensitivity 115.81 μA·μM -1 ·cm -2 . PAP could be obtained by the biochemical reaction of β-Gal in the presence of substrate PAP-β-galactopyranoside, which could realize for biochemical sensing of β-Gal in a linear range of 0.2 -0.8 mU·L -1 with a LOD of 9.35 nU·L -1 and sensitivity of 4.77 μA (mU·L -1 ) -1 ·cm -2 . The β-Gal is an indicator of total coliforms represented by E. coli that are induced by isopropyl-β-thiogalactopyranoside, which could applied for biochemical sensing of E. coli in a linear range of 6 × 106 –1.6 × 108 cfu·mL-1 with LOD of 6.65 × 10 5 cfu·mL -1 and sensitivity of 2.44 μA·(cfu·mL -1 ) -1 ·cm -2 . This work will provide experimental support for multifunctional chemical and biochemical sensing platform based on 2D layered nanomaterials decorated with bimetallic nanoelectrocatalysts.
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2023
·Vol. 148
·期 10
·4211-4221
·
IF 4.4
Dai Shuming,Song Ping,Jiao Ziyue,Cheng Yi,Shang Jingzhao,Leng Xuefei,Wei Zhiyong,Li Yang
A series of bisphenol A-based polyarylates was synthesized by using 2,2-bis (4-hydroxyphenyl) propane (BPA), terephthaloyl dichloride (TPC), and isophthaloyl dichloride (IPC) as raw materials and p-tert-butylphenol as a capping agent through interfacial polymerization to investigate the effect of end group structure on polymer properties. And the polymer films could be obtained by solvent casting method. The successful introduction of p-tert-butylphenol into the backbone adjusted molecular masses and achieved a regulable improvement of the polymer’s thermal properties. The thermal mass loss 5% temperature of the polymers raised above 470 °C, which indicated the thermal properties were broadly in line with that of the commercial product U-100. Besides, the addition of capping agent also improved the light transmission of the polymers and the transmittance reached above 83% at a wavelength of 450 nm. In addition, the thermal degradation mechanism of polyarylate and U-100 was investigated by simultaneous thermal analysis (STA)-IR and Py/GC–MS. It was discovered that PAR decomposed thermally at their end groups and ester groups first, followed by the breakage of their carbon–carbon bonds, which coincided with U-100’s thermal degradation mechanism. The thermal degradation mechanism of bisphenol A-based polyarylates was proposed. Graphical abstract
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FUEL PROCESSING TECHNOLOGY
·
2023
·
IF 7.5
Jie Xu,Xiaowei Liu,Rui Li,Boxiong Shen,Zijian Zhou,Lidan Deng,Lei Liu,Xinbo Zhu
Converting CO 2 into renewable fuel via photocatalysis is of significance to solving the energy crisis and climate change. However, the limited electron transfer in single catalysts always limits the reduction reaction. In this work, a p-n heterojunction was constructed between Cr doped MgAl–LDH (abbreviated as LDH) and Co 3 O 4 for visible-light-driven fuel production. Since LDH and Co 3 O 4 both have the sufficient potentials to drive CO 2 photoreduction, the constructed type-II heterojunction is more favorable for electron utilization efficiency. The optimal Co 3 O 4 /LDH heterojunction exhibited the highest CO evolution rate of 7.42 μmol•g −1 •h −1 and a CO selectivity of 90.5% with TEOA as sacrificial agent . The further characterizations highlight that the addition of Co 3 O 4 greatly improves the light absorption and the heterojunction effectively promotes the reverse migration of electrons and holes. This work investigates and verifies the designed type-II heterojunction based on MgAl–LDH, which has the guidance for the design of heterojunction catalysts and promotes the practical application of MgAl–LDH in photocatalytic region.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Ya-Nan Zhao,Kai-Sheng Yao,Ao-Zhou Wang,Wei-Wei Lu
Developing a facile green strategy to one-step prepare anisotropic bimetallic nanomaterials with hierarchical structures is preferred choice but remains technically challenge. Here, a simple ionic liquid-directed route is developed for the fabrication of Pd 3 Cu 1 alloy nano-urchins (NUs) at room temperature in aqueous solution. To achieve the synthetic protocol, water-soluble Na 2 PdCl 4 and CuCl 2 are used as the initial raw materials, ascorbic acid as the reducing agent, and a common ionic liquid 1-butyl-3-methylimidazolium chloride ([C 4 mim]Cl) is applied to guide the growth and formation of Pd 3 Cu 1 NUs, vividly demonstrating the green and cost-saving features. The various factors affecting the shapes and sizes of products are researched. The results show that [C 4 mim]Cl is vital to the formation of thorny Pd 3 Cu 1 NUs. The Pd 3 Cu 1 NUs possess uniform morphology, lots of sharp thorns, high specific surface area and 3D freestanding structures, and exhibit outstanding catalytic activity, selectivity and durability for p -nitrobenzaldehyde hydrogenation having 100% conversion and 94.6% selectivity to p -aminobenzaldehyde. It is believed that the 3D Pd 3 Cu 1 NUs would also have hopeful prospects in electrocatalysis , sensor and beyond.
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RSC Advances
·
2023
·Vol. 13
·期 11
·7614-7620
·
IF 3.9
Lei Wei,Yanhong Lu,Ruixuan Lu,Yuxin Cui
Hydrolytic dehydrogenation of ammonia borane is a significant and promising approach for on-site hydrogen production at ambient conditions, and developing highly efficient and low-cost catalysts has attracted considerable attention. Herein, waste-biomass-derived activated carbon (AC) was prepared by hydrothermal carbonization and alkali-assisted activation, and non-precious bimetal phosphides (Co–Cu–P) nanocatalysts with a series of different Co/Cu ratios were synthesized on the AC surface through in situ phosphidation method. Owing to the synergetic effects, the optimal Co0.8Cu0.2P/AC presents an outstanding turnover frequency of 26.5 min−1 (25 °C), which is much higher than that of many reported catalysts. The reaction activation energy was measured to be 34.6 kJ mol−1. Benefiting from the ferromagnetic nature of the phosphides, the Co0.8Cu0.2P/AC can be magnetically separated and reused again. After recycling six times, the catalyst still retains 72% of the initial activity, thus indicating great potential for practical applications.
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RSC Advances
·
2023
·Vol. 13
·期 17
·11530-11536
·
IF 3.9
Bin Li,Aolin Wu,Wenrui Hao,Jizhen Liu,Zhigang Hu,Ying Wang
Deep eutectic solvent (DES) was synthesized from urea (U), acrylamide (AM) and choline chloride (ChCl), sodium alginate (SA) was selected as filler, and SA/P(U-AM-ChCl) composite hydrogel was prepared by thermal initiation frontal polymerization (FP). The hydrogels were characterised by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The effects of SA on the swelling properties, mechanical properties and self-healing properties of the composite hydrogels were investigated. The results show that the swelling properties of the composite hydrogel with the addition of SA are greatly enhanced due to the large number of hydroxyl groups contained in the SA chain. The tensile strength of the hydrogel gradually increased with increasing SA content, with the maximum tensile strength increasing by a factor of 2.89. The self-healing efficiency of the composite hydrogel gradually increased with the increase of SA, and the healing rate of FP5 reached 94.4% after 48 h of healing. This study provides a simple and rapid method for the preparation of composite hydrogels with good mechanical properties and self-healing properties.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Zhaoyi Yang,Xiaofang Yang,Guangyu An,Dongsheng Wang
Optimization of Fe-based heterogeneous catalyst for enhancing PMS activation was studies by an electronic structure regulation strategy. The single atom and nano-particle Fe-catalysts were then modified by P-doping on carbon support and tested for BPA degradation. Catalysts with P-doping led to 100 % BPA degradation in 30 min, much better than single atom and nano-particle control groups (56 % and 61 %). Experimental and DFT results revealed that P-doping increased the electron density of Fe and induced the transformation of Fe 3d electron spin state from low spin to medium spin, then the Fe 3d orbitals with high energy could better overlap with O 2p orbitals of PMS, promoting the electron transfer process from Fe to PMS and generation of hydroxyl radical. This work provides a deep understanding of spin state modulation for designing high-performance PMS activation catalysts.
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