Advanced Powder Materials最新文献

{"title":"Laser powder bed fusion of a Ni3Al-based intermetallic alloy with tailored microstructure and superior mechanical performance","authors":"Mingyu Liu ,&nbsp;Jiang Wang ,&nbsp;Tao Hu ,&nbsp;Songzhe Xu ,&nbsp;Sansan Shuai ,&nbsp;Weidong Xuan ,&nbsp;Shuo Yin ,&nbsp;Chaoyue Chen ,&nbsp;Zhongming Ren","doi":"10.1016/j.apmate.2023.100152","DOIUrl":"10.1016/j.apmate.2023.100152","url":null,"abstract":"<div><p>Ni₃Al-based alloys are excellent candidates for the structural materials used for turbine engines due to their excellent high-temperature properties. This study aims at laser powder bed fusion and post-hot isostatic pressing (HIP) treatment of Ni₃Al-based IC-221 ​M alloy with a high γ′ volume fraction. The as-built samples exhibits unavoidable solidification cracking and ductility dip cracking, and the laser parameter optimization can reduce the crack density to 1.34 ​mm/mm². Transmission electron microscope (TEM) analysis reveals ultra-fine nanoscale γ′ phases in the as-built samples due to the high cooling rate during rapid solidification. After HIP treatment, a fully dense structure without cracking defects is achieved, which exhibits an equiaxed structure with grain size ∼120–180 ​μm and irregularly shaped γ′ precipitates ∼1–3 ​μm with a prominently high fraction of 86%. The room-temperature tensile test of as-built samples shows a high ultimate tensile strength (<em>σ</em>_UTS) of 1039.7 ​MPa and low fracture elongation of 6.4%. After HIP treatment, a significant improvement in ductility (15.7%) and a slight loss of strength (<em>σ</em>_UTS of 831.7 ​MPa) are obtained by eliminating the crack defects. Both the as-built and HIP samples exhibit retained high <em>σ</em>_UTS values of 589.8 ​MPa and 786.2 ​MPa, respectively, at 900 ​°C. The HIP samples exhibita slight decrease in ductility to ∼12.9%, indicating excellent high-temperature mechanical performance. Moreover, the abnormal increase in strength and decrease in ductility suggest the critical role of a high γ′ fraction in cracking formation. The intrinsic heat treatment during repeating thermal cycles can induce brittleness and trigger cracking initiation in the heat-affected zone with notable deteriorating ductility. The results indicate that the combination of LPBF and HIP can effectively reduce the crack density and enhance the mechanical properties of Ni₃Al-based alloy, making it a promising material for high-temperature applications.</p></div>","PeriodicalId":7283,"journal":{"name":"Advanced Powder Materials","volume":"3 1","pages":"Article 100152"},"PeriodicalIF":0.0,"publicationDate":"2023-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772834X23000441/pdfft?md5=920cae6cedeb9df7a696f6200100a673&pid=1-s2.0-S2772834X23000441-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76167619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Balancing loading mass and gravimetric capacitance of NiCo−layered double hydroxides to achieve ultrahigh areal performance for flexible supercapacitors","authors":"Jie Zhao ,&nbsp;Cao Zhou ,&nbsp;Yue Guo ,&nbsp;Zhen Shen ,&nbsp;Geng Luo ,&nbsp;Qiang Wu ,&nbsp;Lijun Yang ,&nbsp;Xizhang Wang ,&nbsp;Zheng Hu","doi":"10.1016/j.apmate.2023.100151","DOIUrl":"10.1016/j.apmate.2023.100151","url":null,"abstract":"<div><p>Delivering high areal capacitance (<em>C</em>_A) at high rates is crucial but challenging for flexible supercapacitors. <em>C</em>_A is the product of areal loading mass (<em>M</em>_A) and gravimetric capacitance (<em>C</em>_W). Finding and understanding the balance between <em>M</em>_A and <em>C</em>_W of supercapacitor materials is significant for designing high-<em>C</em>_A electrodes. Herein, we have systematically studied the correlation between <em>M</em>_A and <em>C</em>_W of the nanosheet arrays of NiCo−layered double hydroxide (NiCo−LDH), which were electrodeposited on carbon cloth with different heights to adjust the <em>M</em>_A, accompanied by the interlayer distance regulation to improve the <em>C</em>_W. The optimal <em>C</em>_W performance is achieved at the best charge transfer kinetics for each of <em>M</em>_A series. The NiCo−LDH electrode with the suitable <em>M</em>_A (2.58 ​mg ​cm⁻²) and the relatively high <em>C</em>_W (1918 F ​g⁻¹ ​at 5 ​A ​g⁻¹ and 400 ​F ​g⁻¹ ​at 150 ​A ​g⁻¹) present a high <em>C</em>_A of 4948 ​mF ​cm⁻² ​at 12.9 ​mA ​cm⁻² and a record-high 1032 ​mF ​cm⁻² among LDHs-based flexible electrodes at an ultrahigh current density of 387 ​mA ​cm⁻². The corresponding flexible supercapacitor coupled with activated carbon delivers a high energy density of 0.28 ​mWh cm⁻² ​at an ultrahigh power density of 712 ​mW ​cm⁻², showing great potential applications.</p></div>","PeriodicalId":7283,"journal":{"name":"Advanced Powder Materials","volume":"3 1","pages":"Article 100151"},"PeriodicalIF":0.0,"publicationDate":"2023-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772834X2300043X/pdfft?md5=270ecc38af71e922386ea714fca9813a&pid=1-s2.0-S2772834X2300043X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79372818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis and modification strategies of g-C3N4 nanosheets for photocatalytic applications","authors":"Long Chen,&nbsp;Michael A. Maigbay,&nbsp;Miao Li,&nbsp;Xiaoqing Qiu","doi":"10.1016/j.apmate.2023.100150","DOIUrl":"10.1016/j.apmate.2023.100150","url":null,"abstract":"<div><p>Graphitic carbon nitride nanosheets (CNNs) become the most promising member in the carbon nitride family benefitted from their two-dimensional structural features. Recently, great endeavors have been made in the synthesis and modification of CNNs to improve their photocatalytic properties, and many exciting progresses have been gained. In order to elucidate the fundamentals of CNNs based catalysts and provide the insights into rational design of photocatalysis system, we describe recent progress made in CNNs preparation strategies and their applications in this review. Firstly, the physicochemical properties of CNNs are briefly introduced. Secondly, the synthesis approaches of CNNs are reviewed, including top-down stripping strategies (thermal, gas, liquid, and composite stripping) and bottom-up precursor molecules design strategies (solvothermal, template, and supramolecular self-assembly method). Subsequently, the modification strategies based on CNNs in recent years are discussed, including crystal structure design, doping, surface functionalization, constructing 2D heterojunction, and anchoring single-atom. Then the multifunctional applications of g-C₃N₄ nanosheet based materials in photocatalysis including H₂ evolution, O₂ evolution, overall water splitting, H₂O₂ production, CO₂ reduction, N₂ fixation, pollutant removal, organic synthesis, and sensing are highlighted. Finally, the opportunities and challenges for the development of high-performance CNNs photocatalytic systems are also prospected.</p></div>","PeriodicalId":7283,"journal":{"name":"Advanced Powder Materials","volume":"3 1","pages":"Article 100150"},"PeriodicalIF":0.0,"publicationDate":"2023-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772834X23000428/pdfft?md5=9f3e916bc55b233577cc81831e23ec14&pid=1-s2.0-S2772834X23000428-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73834735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Confined magnetic vortex motion from metal-organic frameworks derived Ni@C microspheres boosts electromagnetic wave energy dissipation","authors":"Lei Wang ,&nbsp;Mengqiu Huang ,&nbsp;Ke Pei ,&nbsp;Wenbin You ,&nbsp;Biao Zhao ,&nbsp;Limin Wu ,&nbsp;Chongyun Liang ,&nbsp;Jincang Zhang ,&nbsp;Renchao Che","doi":"10.1016/j.apmate.2023.100111","DOIUrl":"https://doi.org/10.1016/j.apmate.2023.100111","url":null,"abstract":"<div><p>Magnetic domain structure plays an important role in regulating the electromagnetic properties, which dominates the magnetic response behaviors. Herein, unique magnetic vortex domain is firstly obtained in the Ni nanoparticles (NPs) reduced from the Ni-based metal-organic frameworks (MOFs) precursor. Due to both the high symmetry spheres and boundary restriction of graphited carbon shell, confined magnetic vortex structure is generated in the nanoscale Ni core during the annealing process. Meanwhile, MOFs-derived Ni@C assembly powders construct special magnetic flux distribution and electron migration routes. MOFs-derived Ni@C microspheres exhibit outstanding electromagnetic (EM) wave absorption performance. The minimum reflection loss value of Ni@C–V microspheres with vortex domain can reach −54.6 ​dB at only 2.5 ​mm thickness, and the efficient absorption bandwidth up to 5.0 ​GHz at only 2.0 ​mm. Significantly, configuration evolution of magnetic vortex driven by the orientation and reversion of polarity core boosts EM wave energy dissipation. Magnetic coupling effect among neighboring Ni@C microspheres significantly enhances the magnetic reaction intensity. Graphitized carbon matrix and heterojunction Ni–C interfaces further offer the conduction loss and interfacial polarization. As result, MOFs-derived Ni@C–V powders display unique magnetic vortex, electronic migration network, and high-performance EM wave energy dissipation.</p></div>","PeriodicalId":7283,"journal":{"name":"Advanced Powder Materials","volume":"2 3","pages":"Article 100111"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49712256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multiscale modelling of irradiation damage behavior in high entropy alloys","authors":"Fusheng Tan ,&nbsp;Li Li ,&nbsp;Jia Li ,&nbsp;Bin Liu ,&nbsp;Peter K. Liaw ,&nbsp;Qihong Fang","doi":"10.1016/j.apmate.2023.100114","DOIUrl":"https://doi.org/10.1016/j.apmate.2023.100114","url":null,"abstract":"<div><p>The increasingly harsh environment of the nuclear reactors and the insurmountable flaws of in-service materials have created an urgent need for the development of the brand-new alloys. For last decade, the high-entropy alloys (HEAs), a novel composition-design strategy, have received much attention due to their promise for the nuclear fields. The application of the multiscale modelling is to explore the irradiation performance and underlying mechanisms of HEAs. Abundant results and data deepen the understanding of the irradiation response, and accelerate the development of advanced irradiation-resistant HEAs. This review introduces the state-of-art multiscale modelling used for studying the irradiated properties of HEAs. Representative irradiation-induced microstructures and properties, as well as damage, are summarized. By strengthening the application of multiscale modelling, a rational design of high irradiation-resistant HEAs is expected.</p></div>","PeriodicalId":7283,"journal":{"name":"Advanced Powder Materials","volume":"2 3","pages":"Article 100114"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49733633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Correlating O-deficiency and luminescence property of Tb3+ doped SrO","authors":"Kaina Wang ,&nbsp;Jipeng Fu ,&nbsp;Shuqin Chang ,&nbsp;Xuan Sun ,&nbsp;Tianyi Sun ,&nbsp;Su Zhang ,&nbsp;Ran Pang ,&nbsp;Lihong Jiang ,&nbsp;Xiaojun Kuang ,&nbsp;Evan Wenbo Zhao ,&nbsp;Chengyu Li ,&nbsp;Shiqing Xu ,&nbsp;Mingxue Tang","doi":"10.1016/j.apmate.2023.100112","DOIUrl":"https://doi.org/10.1016/j.apmate.2023.100112","url":null,"abstract":"<div><p>Cubic rock salt can lower down or break the rare earth transition barrier through interstitial or vacancy defects owing to its great deformation and rotation flexibility. Here, we demonstrate that oxygen vacancies in SrO are induced by proper oxidization and atmosphere adjustment, resulting in defects with various depths and crystal field distortion. The thermally assisted tunneling from defects to ⁵D₄ state and electronic population decrease on ⁵D₃ state of Tb³⁺ are observed by the deformation of adjacent oxygen octahedral structure. Finally, the as-prepared SrO: 0.01 ​Tb³⁺ phosphors, commercial BaMgAl₁₀O₁₇: Eu²⁺ blue phosphor, and CaAlSiN₃: Eu²⁺ red phosphor are mixed and coated onto 280 ​nm deep-ultraviolet LED chip to assemble white light-emitting LED device. The LEDs show CCT of 3850 ​K, 4136 ​K, and 4741 ​K, with color rendering index of 90.3, 90.8, and 92.1, respectively. These insights will advance the fundamental knowledge of crystal engineering in cubic rock salt, and enable new ways to manipulate energy transfer and electronic transition via defects.</p></div>","PeriodicalId":7283,"journal":{"name":"Advanced Powder Materials","volume":"2 3","pages":"Article 100112"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49711913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Underwater laser directed energy deposition of NV E690 steel","authors":"Mingzhi Chen ,&nbsp;Kun Yang ,&nbsp;Zhandong Wang ,&nbsp;Shibin Wang ,&nbsp;Erke Wu ,&nbsp;Zhonghua Ni ,&nbsp;Jinzhong Lu ,&nbsp;Guifang Sun","doi":"10.1016/j.apmate.2022.100095","DOIUrl":"https://doi.org/10.1016/j.apmate.2022.100095","url":null,"abstract":"<div><p>Powder-based laser direct metal deposition (DMD), one of the directed energy deposition, was applied in air and underwater to repair pre-machined NV E690 steel plates. Systematic investigations on the effects of underwater environment and ambient pressures (0.01–0.35 MPa) on the microstructure evolution, phase transformation, and mechanical properties were conducted. The water quenching effect refined the grain size and increased the dislocation density and lath martensite content. The theoretical models of the underwater pressurized nitriding process and the precipitation kinetics of (Ti, V)N particles were established. Moreover, the microstructure evolution and the mechanical properties of other underwater DMD repaired samples did not show obvious relation with the underwater ambient pressures. This investigation not only provides a candidate for the underwater restoration technique but also bridges marine engineering and emerging DMD technology.</p></div>","PeriodicalId":7283,"journal":{"name":"Advanced Powder Materials","volume":"2 3","pages":"Article 100095"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49712407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Phase selection-oriented mechanical properties tailoring for β-type TiNbZrTaSi alloy fabricated by laser powder bed fusion","authors":"Xuan Luo ,&nbsp;Tao Song ,&nbsp;Feng Wang ,&nbsp;Haizhou Lu ,&nbsp;Limei Kang ,&nbsp;Hongwei Ma ,&nbsp;Dongdong Li ,&nbsp;Annett Gebert ,&nbsp;Chao Yang","doi":"10.1016/j.apmate.2023.100118","DOIUrl":"https://doi.org/10.1016/j.apmate.2023.100118","url":null,"abstract":"<div><p>The morphology and distribution of silicides in α/α+β type titanium alloys impress on their properties. Nevertheless, the types of silicide precipitates and their formation mechanisms remain unclear in β-type Ti–Nb–Zr–Ta alloys. In this study, we report the precipitation behavior of silicides formed upon aging treatment of a laser powder bed fusion (LPBF)-fabricated β-type Ti–34.5Nb–6.9Zr–4.9Ta–1.4Si (wt%, TNZTS) alloy. We further discuss their underlying formation mechanism and silicide selection-oriented mechanical properties tailoring for LPBF-fabricated TNZTS alloy. Two novel silicide precipitates were formed: a supersaturated Si–rich β–Ti matrix in the form of a network that can further transform into the (Ti, Zr)₂Si (S2) phase with the increase of aging temperature; and a short, rod-like S2 precipitate adjacent to pre-existing dot-shaped S2. The former results from the aggregation of Si solute atoms towards to the dislocation walls/microbands and the subsequent precipitation reaction, while the latter arises from the considerable micro-strain around the phase boundary between the dot-shaped S2 and β-Ti owing to the large difference in their thermal expansion coefficients. The aging-treated TNZTS alloy exhibits a good combination of tensile strength (1083 ​± ​5 ​MPa) and fracture strain (5.6% ​± ​1.0%), which is attributed to precipitation strengthening, grain-boundary strengthening, and discontinuous intergranular silicide derived from phase selection. The obtained results provide a basis for the design and fabrication of biomedical Si-containing β-type Ti alloys with excellent mechanical properties.</p></div>","PeriodicalId":7283,"journal":{"name":"Advanced Powder Materials","volume":"2 3","pages":"Article 100118"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49712413","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Novel experimental strategy towards temperature inhomogeneity during spark plasma sintering of metallic glasses","authors":"Huaping Ding ,&nbsp;Xiaoqian Bao ,&nbsp;Mao Zhang ,&nbsp;Junsong Jin ,&nbsp;Lei Deng ,&nbsp;Kefu Yao ,&nbsp;Atefeh Solouk ,&nbsp;Pan Gong ,&nbsp;Xinyun Wang","doi":"10.1016/j.apmate.2023.100109","DOIUrl":"https://doi.org/10.1016/j.apmate.2023.100109","url":null,"abstract":"<div><p>Despite the importance of temperature distribution in spark plasma sintering of metallic glasses, its quantification has been experimentally laborious. This work proposes an experimental strategy to determine the sintering temperature by establishing a quantitative relationship between the temperature-thermal signal. We reproduced the thermal profiles of spark plasma sintering by isothermal annealing and found a correlation between annealing temperature and isothermal crystallization time. This strong correlation indicates the temperature-dependent structural evolution of glassy powders. Using isothermal crystallization time as the measuring gauge, we correlated the annealing temperature to the sintering temperature and obtained the sample temperature map. The sample temperature is at least 19 ​°C higher than the nominal temperature of 425 ​°C measured by the thermocouple. Meanwhile, the sample temperature shows a hump-shaped pattern closely correlated with the current density. The maximum temperature of 453 ​°C occurs on the sample/punches contact surfaces. Temperature heterogeneity within the sample induces diverse microstructures and porous structures. We elucidate that the temperature inhomogeneity is intrinsic, given the presence of contact interfaces. Contact resistances affect the current distribution and heat transfer, resulting in a larger temperature gradient than the traditional powder metallurgy process.</p></div>","PeriodicalId":7283,"journal":{"name":"Advanced Powder Materials","volume":"2 3","pages":"Article 100109"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49734189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Construction of hollow binary oxide heterostructures by Ostwald ripening for superior photoelectrochemical removal of reactive brilliant blue KNR dye","authors":"Hongchao Ma ,&nbsp;Fanyue Zhao ,&nbsp;Ming Li ,&nbsp;Pengyuan Wang ,&nbsp;Yinghuan Fu ,&nbsp;Guowen Wang ,&nbsp;Xinghui Liu","doi":"10.1016/j.apmate.2023.100117","DOIUrl":"https://doi.org/10.1016/j.apmate.2023.100117","url":null,"abstract":"<div><p>Although the Ostwald ripening approach is often utilized to manufacture single hollow metal oxide, constructing hollow binary oxide heterostructures as potent photoelectrochemical (PEC) catalysts is still obscure and challenging. Herein, we reveal a general strategy for fabricating hollow binary oxides heterostructures (Co₃O₄-δ-MnO₂ and Co₃O₄–SnO₂) utilizing Ostwald ripening. Hollow Co₃O₄-δ-MnO₂ nano-network with the structure evolution process was systematically explored through experimental and theoretical tools, identifying the origin of hollow binary oxides due to the interfaces acting as landing sites for their growth. In addition, the structural evolution, from hollow Co₃O₄-δ-MnO₂ to Co₃O₄-α-MnO₂, can be observed when the time of secondary hydrothermal reaches 96 ​h due to the topotactic layer-to-tunnel transition process. Notably, optimized Co₃O₄-δ-MnO₂-48 exhibits a superior PEC degradation efficiency of 96.42% and excellent durability (20,000 ​min) under harsh acid conditions, attributed to the massive hollow structures' vast surface area for high intently active species. Furthermore, density functional theory simulations elucidated the Co₃O₄-δ-MnO₂’ electron-deficient surface and high d-band center (Co₃O₄-δ-MnO₂, -1.06; Co₃O₄-α-MnO_2, -1.49), strengthening the interaction between the catalyst's surface and active species and prolonging the lifetime of active species of •O₂⁻ and ¹O₂. This work not only demonstrates superior PEC degradation efficiency of hollow Co₃O₄-δ-MnO₂ for practical use but also lays the cornerstone for constructing hollow binary oxides heterostructures through Ostwald ripening.</p></div>","PeriodicalId":7283,"journal":{"name":"Advanced Powder Materials","volume":"2 3","pages":"Article 100117"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49711916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}