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Your search keyword '"Li, Guohua"' showing total 257 results
Start Over Author "Li, Guohua" Publisher elsevier b.v.
257 results on '"Li, Guohua"'

11. Post-traumatic stress disorder and traumatic events in China: a nationally representative cross-sectional epidemiological study

Author

Li, Weihui, Cheng, Peng, Liu, Zhaorui, Ma, Chao, Liu, Bangshan, Zheng, Wanhong, Scarisbrick, Dave, Lu, Jin, Li, Lingjiang, Huang, Yueqin, Wang, Limin, Yan, Yongping, Xiao, Shuiyuan, Zhang, Yan, Zhang, Tingting, Yan, Jie, Yu, Yaqin, Xu, Xiufeng, Wang, Zhizhong, Xu, Yifeng, Li, Tao, Xu, Guangming, Xu, Xiangdong, Xue, Meihua, Li, Guohua, Jia, Fujun, Shi, Jianfei, Zhang, Ning, Du, Xinbai, Sang, Hong, Zhang, Congpei, and Liu, Bo

Published
2023
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18. Asphalt induced highly dispersed CoP/MoO2 heterojunction embedded in porous N-doped carbon for pH-universal water splitting.

Author

Li, Guohua, Yang, Fan, Che, Sai, Liu, Hongchen, Chen, Neng, Qian, Jinxiu, Yu, Chunhui, Cheng, Jiating, Zhang, Xiaoyun, Li, Xi, and Li, Yongfeng

Subjects
*GIBBS' free energy, *COBALT phosphide, *CHARGE exchange, *METAL-organic frameworks, *DOPING agents (Chemistry)
Abstract

Designing efficient water splitting electrocatalysts in pH-universal electrolytes is vital yet poses significant challenges. Here, the CoP/MoO 2 heterogeneous interface embedded in porous N-doped carbon (CoP/MoO 2 /NC) was designed by phosphating asphalt enwrapping polyoxometalate-based metal-organic frameworks (POM/ZIF67@asphalt). The CoP/MoO 2 /NC shows excellent performances with low overpotentials of 55, 50, 99 mV for HER and 194, 185, 285 mV for OER at 10mA·cm−2 current density in 1.0 M KOH, 0.5 M H 2 SO 4 , and 1.0 M PBS, respectively. Such superior performance can be attributed to the highly dispersed nanoparticles, heterogeneous interface effect of electron transfer from CoP to MoO 2 , and optimized Gibbs free energy. The long-time stabilities for over 24 h are ensured with negligible decline in all electrolytes, which can be attributed to the excellent stability of CoP/MoO 2 and the corrosion resistance of thin carbon layer. Additionally, in overall water splitting, the CoP/MoO 2 /NC only requires voltages of 1.53 V/1.52 V/1.67 V to gain 10 mA cm−2 in alkaline medium, acidic medium and neutral medium, which exceeded the most reported non-precious catalysts. This work exhibits the excellent pH-universal electrocatalysts with high activity and stability. [Display omitted] • CoP/MoO 2 heterojunction embedded in porous N-doped carbon was prepared by using petroleum pitch as carbon source. • The unique structure of CoP/MoO 2 /NC provided the highly dispersed nanoparticles. • CoP/MoO 2 /NC had excellent catalytic performances toward HER, OER and overall water splitting over a wide pH range. [ABSTRACT FROM AUTHOR]

Published
2024
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24. The comorbidity of mental and physical disorders with self-reported chronic back or neck pain: Results from the China Mental Health Survey

Author

Xu, Yifeng, Wang, Yan, Chen, Jianhua, He, Yanling, Zeng, Qingzhi, Huang, Yueqin, Xu, Xiufeng, Lu, Jin, Wang, Zhizhong, Sun, Xian, Chen, Jing, Yan, Feng, Li, Tao, Guo, Wanjun, Xu, Guangming, Tian, Hongjun, Xu, Xiangdong, Ma, Yanjuan, Wang, Limin, Zhang, Mei, Yan, Yongping, Wang, Bo, Xiao, Shuiyuan, Zhou, Liang, Li, Lingjiang, Zhang, Yan, Chen, Hongguang, Zhang, Tingting, Yan, Jie, Ding, Hua, Yu, Yaqin, Kou, Changgui, Jia, Fujun, Liu, Jian, Chen, Zheli, Zhang, Ning, Du, Xinbai, Du, Xiangdong, Wu, Yue, and Li, Guohua

Published
2020
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33. Mo-doped CoP nanoparticles anchored on porous Co-N-C framework as an efficient bifunctional electrocatalyst for pH-universal water splitting.

Author

Li, Guohua, Yang, Fan, Che, Sai, Liu, Hongchen, Chen, Neng, Qian, Jinxiu, Yu, Chunhui, Jiang, Bo, Liu, Mengxi, and Li, Yongfeng

Subjects
HYDROGEN evolution reactions, TRANSITION metal catalysts, OXYGEN evolution reactions, CRUMB rubber, CATALYTIC activity, DOPING agents (Chemistry), NANOPARTICLES
Abstract

• Mo-CoP/Co-N-C was first prepared by using petroleum pitch as a carbon source in a simple one-pot method. • The unique structure of Mo-CoP/Co-N-C provided a high specific surface area with abundant active sites. • Mo-CoP/Co-N-C had excellent catalytic performances toward HER, OER, and overall water splitting over a wide pH range. Designing highly active and stable noble-metal-free electrocatalysts for water splitting over a wide pH range is critical yet remains significantly challenging. In this work, Mo-doped CoP nanoparticles (Mo-CoP) supported and enwrapped by porous single-atomic-Co doped carbon framework (Co-N-C) were designed and prepared by a simple one-pot pyrolysis method. The Mo-CoP/Co-N-C electrocatalyst exhibits superior performance with low overpotentials of only 45 mV for hydrogen evolution reaction (HER) and 201 mV for oxygen evolution reaction (OER) in 1 M KOH at 10 mA cm–2 current density. Such excellent catalytic activity can be ascribed to enhanced intrinsic activity, large surface area, and highly exposed active sites. Meanwhile, an extremely small overpotential of only 250 mV is required for a large current density of 500 mA cm–2 in HER, which exceeds the performance of benchmark 10% Pt/C. Besides, Mo-CoP/Co-N-C also exhibits superior HER performance in acidic and neutral mediums, with overpotentials of only 41 and 98 mV in 0.5 M H 2 SO 4 , and 1 M PBS, respectively, thus achieving efficient water splitting at a wide pH range. The long-term stabilities are guaranteed with no significant decline of catalytic activities for more than 24 h in all electrolytes, which can be ascribed to the carbon layer encapsulation structure. Additionally, in overall water splitting, the electrocatalytic cell consisting of the as-synthesized Mo-CoP/Co-N-C only requires a cell voltage of 1.611 V at 100 mA cm–2 with excellent stability, exceeding that of the benchmark Pt/C||RuO2 couple (1.645 V at 100 mA cm–2). This work not only presents a highly efficient electrocatalyst for pH-universal water splitting but also provides a new perspective for the design and construction of transition metal catalysts with excellent stability. In this work, Mo doped CoP nanoparticles supported and enwrapped by porous Co-N-C framework (single-atomic-Co doped carbon) was prepared by using petroleum pitch as carbon source in a simple one-pot method. Here, asphalt was not only used as a carbon source, but also formed a carbon layer in the pyrolysis to enwrap the active components and limit the particle size. The Mo-CoP/Co-N-C electrocatalyst shows superior HER performance (45 mV@10 mA cm−2 in 1 M KOH, 41 mV@10 mA cm−2 in 0.5 M H2SO4, 98 mV@10 mA cm−2 in 1 M PBS) and excellent OER performance in a wide pH range. Particularly, Mo-CoP/Co-N-C exhibits the low overpotential of only 250 mV for HER at a large current density of 500 mA cm-2 in alkaline media, which exceeds the benchmark of 10% Pt/C. Meanwhile, the electrocatalysts show satisfactory stability with no significant decline of catalytic activities for 24 h at all pH values. In overall water splitting, the electrocatalyst only required a cell voltage of 1.611 V at 100 mA cm-2 with an excellent stability. The outstanding performance and stability of the Mo-CoP/Co-N-C can be attributed to the following aspects: (1) the electronic structure of CoP could be adjusted by Mo doping, resulting in enhanced hydrophilicity and enhanced intrinsic activity. (2) Co-N-C as a support can not only increase the specific surface area of the material and improve the conductivity, but also change the local electrochemical environment, accelerate the charge transfer, and expose more active sites. (3) Petroleum asphalt is used as a carbon source to form the encapsulation structure and limit the agglomeration of active components, which also guarantee its long-term stability. [Display omitted] [ABSTRACT FROM AUTHOR]

Published
2023
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