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Chinese Chemical Letters 2024年第2期35卷 611-616页

作者： Jiawen Sun Hui Xue Jing Sun niankun guo Tianshan Song Yi-Ru Hao Qin Wang College of Chemistry and Chemical Engineering Inner Mongolia UniversityHohhot 010021China

Modulating surface charge redistribution based on interface and defect engineering has been considered as a resultful means to boost electrocatalytic ***,the mechanism of synergistic regulation of heterojunction and vacancy defects remains ***,a Vs-CoP-CoS_(2)/C n-n heterojunction with sulfur vacancies is successfully constructed,which manifests superior electrocatalytic activity for oxygen evolution,as demonstrated by a low overpotential of 170 mV to reach 10 mA/cm^(2).The experimental results and density functional theory calculations testify that the outstanding OER performance of Vs-CoP-CoS_(2)/C heterojunction is owed to the synergistic effect of sulfur vacancies and built-in electric field at n-n heterogeneous interface,which accelerates the electron transfer,induces the charge redistribution,and regulates the adsorption energy of active intermediates during the *** study affords a promising means to regulate the electrocatalytic performance by the construction of heterogeneous interfaces and defects,and in-depth explores the synergistic mechanisms of n-n heterojunction and vacancies.

关键词： Charge redistribution n-n Heterojunction Built-in electric field Sulfur vacancy Oxygen evolution reaction

Co-Construction of Sulfur Vacancies and Heterogeneous Interface into Ni_(3)S_(2)/MoS_(2) Catalysts to Achieve Highly Efficient Overall Water Splitting

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Chinese Journal of Structural Chemistry 2022年第8期41卷 37-43页

作者： Zhaoyang An Hui Xue Jing Sun niankun guo Tianshan Song Jiawen Sun Yi-Ru Hao Qin Wang College of Chemistry and Chemical Engineering Inner Mongolia UniversityHohhot 010021China

Integrating the advantages of anion vacancies and heterostructures into the catalytic materials may increase the binding affinities to intermediates, provide more active sites, and significantly promote the activity of overall water splitting. However, the successful assembly of anion vacancies and heterostructures for high-efficiency water splitting performance is still challenging. In this work, we ingeniously present the co-construction of sulfur vacancies and heterogeneous interface into Ni_(3)S_(2)/MoS_(2) catalysts on nickel foam(NF). The introduction of sulfur vacancies and Ni_(3)S_(2)/MoS_(2) heterostructures can significantly improve electron and ion transport, effectively improve structural stability, and enhance overall water splitting activity. The obtained VSNi_(3)S_(2)/MoS_(2) catalysts(VS stands for sulfur vacancies) exhibit superior OER and HER activities,and the overpotentials for OER and HER are 180 and 71 mV at 10 mA·cm^(-2), respectively. Furthermore, a low water splitting voltage of 1.46 V is required at 10 mA·cm^(-2) for the VS-Ni_(3)S_(2)/MoS_(2) catalysts, which is considerably lower than most that of water splitting electrocatalysts currently reported. This work offers an effective mean for the preparation of catalysts with both anion vacancies and heterostructures for achieving high-performance alkaline overall water splitting.

关键词： sulfur vacancies heterostructures transition metal chalcogenides overall water splitting

Synergy of phosphorus vacancies and build-in electric field into NiCo/NiCoP Mott-Schottky integrated electrode for enhanced water splitting performance

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Chinese Chemical Letters 2024年第2期35卷 604-610页

作者： Xiaochen Zhang Hui Xue Jing Sun niankun guo Tianshan Song Jiawen Sun Yi-Ru Hao Qin Wang College of Chemistry and Chemical Engineering Inner Mongolia UniversityHohhot 010021China

Vacancy engineering and Mott-Schottky heterostructure can accelerate charge transfer,regulate adsorption energy of reaction intermediates,and provide additional active sites,which are regarded as valid means for improving catalytic ***,the underlying mechanism of synergistic regulation of interfacial charge transfer and optimization of electrocatalytic activity by combining vacancy and Mott-Schottky junction remains ***,the growth of a bifunctional NiCo/NiCoP Mott-Schottky electrode with abundant phosphorus vacancies on foam nickel(NF)has been synthesized through continuous phosphating and reduction *** obtained NiCo/NiCoP heterojunctions show remarkable OER and HER activities,and the overpotentials for OER and HER are as low as 117 and 60 mV at 10 mA/cm^(2) in 1 mol/L KOH,***,as both the cathode and anode of overall water splitting,the voltage of the bifunctional NiCo/NiCoP electrocatalyst is 1.44 V at 10 mA/cm^(2),which are far exceeding the benchmark commercial *** theoretical calculation results confirm that the phosphorus vacancies and build-in electric field can effectively accelerate ion and electron transfer between NiCo alloy and NiCoP semiconductor,tailor the electronic structure of the metal centers and lower the Gibbs free energy of the ***,the unique self-supported integrated structure is beneficial to facilitate the exposure of the active site,avoid catalyst shedding,thus improving the activity and structural stability of NiCo/*** study provides an avenue for the controllable synthesis and performance optimization of Mott-Schottky electrocatalysts.

关键词： Mott-Schottky Build-in electric field Phosphorus vacancies Phosphides Overall water splitting

Revealing the interfacial electron modulation effect of CoFe alloys with CoC_(X) encapsulated in N-doped CNTs for superior oxygen reduction

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Advanced Powder Materials

Advanced Powder Materials 2022年第3期1卷 11-17页

作者： Jing Sun niankun guo Tianshan Song Yi-Ru Hao Jiawen Sun Hui Xue Qin Wang College of Chemistry and Chemical Engineering Inner Mongolia UniversityHohhot010021PR China

Rationally designing and developing robust and durable electrocatalytic materials for oxygen reduction/evolution are essential for metal-air ***,an effective approach is proposed to fabricate high-performance electrocatalysts based on CoFe alloy and CoC_(X) nanoparticles sandwiched in nitrogen-doped carbon *** preparation of CoFe-CoC_(X)@NCNT is achieved by the calcination of CoFe_(2)O_(4) spinel and dicyandiamide under reducing *** CoFe-CoC_(X)@NCNT catalyst exhibits remarkable oxygen reduction reaction(ORR)performance with the onset and half-wave potential of 1.01 V and 0.89 V,respectively,exceeding the commercial Pt/C ***,the Zn-air battery using CoFe-CoC_(X)@NCNT as air cathode shows a power density of 175 mW cm-2,which is also higher than that of the industrial Pt/C t RuO_(2).The super electrocatalytic performance is attributed to the multiple heterointerface and strong coupling effect among CoFe,CoC_(X),and NCNT,which can regulate conductivity and electron structure of the *** study supplies a practical strategy to exploit active and low-cost catalytic material for Zn-air batteries,and presents an in-depth insight into the designing of efficient green energy storage devices.

关键词： Electronic structure Interfacial Synergistic effect Oxygen reduction Zinc-air battery

Cu_(3)P辅助诱导Ni_(2)P电荷定向转移和表面重构以获得高效析氧活性

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物理化学学报 2024年第3期40卷 31-32页

作者：邢雅娟薛辉孙静郭念坤宋天山孙佳雯郝翊茹王勤内蒙古大学化学化工学院呼和浩特010021

与助催化剂形成异质结,通过调整活性位点的电子结构和电荷输运来提高Ni_(2)P的电催化活性是一种可行的方法。本文成功构建了一种高效的Cu_(3)P/Ni_(2)P异质结催化剂,其中Cu_(3)P本身仅作为助催化剂,通过调节Ni_(2)P的电子转移和表面重... 详细信息

与助催化剂形成异质结,通过调整活性位点的电子结构和电荷输运来提高Ni_(2)P的电催化活性是一种可行的方法。本文成功构建了一种高效的Cu_(3)P/Ni_(2)P异质结催化剂,其中Cu_(3)P本身仅作为助催化剂,通过调节Ni_(2)P的电子转移和表面重构来提高电催化活性。结果表明,在10 mA·cm^(-2)的电流密度下,Cu_(3)P/Ni_(2)P具有优异的析氧反应(OER)活性,过电位为213 mV。结合实验结果和理论计算可知,Cu_(3)P助催化剂可以有效调整Ni中心的电子结构,实现电荷重分布,降低反应能垒,从而显著提高OER催化活性。此外,Cu_(3)P助催化剂诱导的丰富的晶界和晶格畸变促进了表面重构,形成Ni5O(OH)9,为OER提供了有效的活性位点。本工作通过引入助催化剂构建了一种新型异质结电催化剂,为优化过渡金属磷化物的电催化性能提供了一条有效途径。

关键词：磷化物异质结助催化剂表面重构析氧反应

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某斜坡场地抗浮设防水位探究

江西建材 2024年第3期 175-177页

作者：张建华张恒源郭念坤苏红青岛福瀛勘测技术有限公司山东青岛266510 青岛建勘工程技术有限公司山东青岛266510 青岛纬测地理信息集团有限公司山东青岛266510 莱西市城市化建设服务中心山东青岛266600

我国地下结构抗浮设防水位研究处于发展阶段,各地区研究成果虽然丰富,但有明显的差异性。根据现行规范和标准,文中以青岛地区某斜坡场地为例,基于青岛地区抗浮经验,可采用三步分区法,或利用CASS软件,采用三角网法,绘出抗浮设防水位等值... 详细信息

我国地下结构抗浮设防水位研究处于发展阶段,各地区研究成果虽然丰富,但有明显的差异性。根据现行规范和标准,文中以青岛地区某斜坡场地为例,基于青岛地区抗浮经验,可采用三步分区法,或利用CASS软件,采用三角网法,绘出抗浮设防水位等值线图,以期为类似的抗浮设计工作提供参考。

关键词：抗浮设防水位抗浮标准等值线图