Replacing platinum for catalyzing hydrogen evolution reaction （HER） in acidic medium remains great chal- lenges. Herein, we prepared few-layered MoS2 by ball milling as an efficient catalyst for HER in acidic medium...Replacing platinum for catalyzing hydrogen evolution reaction （HER） in acidic medium remains great chal- lenges. Herein, we prepared few-layered MoS2 by ball milling as an efficient catalyst for HER in acidic medium, The activity of as-prepared MoS2 had a strong dependence on the ball milling time, Furthermore, Ketjen Black EC 300J was added into the ball-milled MoS2 followed by a second ball milling, and the resultant MoS2/carbon black hybrid material showed a much higher HER activity than MoS2 and carbon black alone. The enhanced activity of the MoS2/carbon black hybrid material was attributed to the increased abundance of catalytic edge sites of MoS） and excellent electrical coupling to the underlving carbon network.展开更多
We implemented the process of producing a new Rib in three different ways, and we selected the process that was the most affordable and required the least labor, and we did it. This paper also considers the influence ...We implemented the process of producing a new Rib in three different ways, and we selected the process that was the most affordable and required the least labor, and we did it. This paper also considers the influence of the cost of the form from MDF, Alumina and Steel on the quality of the product.展开更多
Developing noble-metal-free oxygen evolution reaction(OER)electrocatalysts with stable performance at large working current is an imperative and yet formidable challenge for practical large scale water splitting.In th...Developing noble-metal-free oxygen evolution reaction(OER)electrocatalysts with stable performance at large working current is an imperative and yet formidable challenge for practical large scale water splitting.In this study,by inheriting hierarchical nanostructure and elemental homogeneity of Prussian blue analogues,a series of medium entropy transition metal phosphides(METMP)OER catalysts with high cost-effectivity,efficiency and stability were precisely prepared.Specifically,the METMP-based((FeCoNi)P/Ni_(2)P-NF)catalyst demonstrates exceptional performance with an overpotential of only 232 mV at 50 mA·cm^(-2)and a Tafel slope of 52.7 mV·dec^(-1),significantly superior to its less entropy counterparts and commercial RuO_(2-).Moreover,it even maintains stability at the industrial standard current density of 500 mA·cm^(-2)for over 200 h.Density functional theory(DFT)calculations indicates that the synergistic effect of Fe,Co,Ni modulates electronic structure of METMPs,which effectively reduces the energy barrier for the rate-determining HOO*formation step,thereby considerably enhancing catalytic activity.This work not only contributes to the fundamental understanding of the role of medium/high entropy in catalysis but also paves the way for the development of next-generation electrocatalysts for energy-related applications.展开更多
基金the financial support from the Ministry of Science and Technology of China (grants 2012CB215500 and 2013CB933100)the National Natural Science Foundation of China (grants 21573222 and 21103178)
文摘Replacing platinum for catalyzing hydrogen evolution reaction （HER） in acidic medium remains great chal- lenges. Herein, we prepared few-layered MoS2 by ball milling as an efficient catalyst for HER in acidic medium, The activity of as-prepared MoS2 had a strong dependence on the ball milling time, Furthermore, Ketjen Black EC 300J was added into the ball-milled MoS2 followed by a second ball milling, and the resultant MoS2/carbon black hybrid material showed a much higher HER activity than MoS2 and carbon black alone. The enhanced activity of the MoS2/carbon black hybrid material was attributed to the increased abundance of catalytic edge sites of MoS） and excellent electrical coupling to the underlving carbon network.
文摘We implemented the process of producing a new Rib in three different ways, and we selected the process that was the most affordable and required the least labor, and we did it. This paper also considers the influence of the cost of the form from MDF, Alumina and Steel on the quality of the product.
基金the National Natural Science Foundation of China(Nos.52372170 , 92163209)the Beijing Natural Science Foundation(No.2232068)the Beijing-Tianjin-Hebei Basic Research Cooperation Special Project(No.B2024204027).
文摘Developing noble-metal-free oxygen evolution reaction(OER)electrocatalysts with stable performance at large working current is an imperative and yet formidable challenge for practical large scale water splitting.In this study,by inheriting hierarchical nanostructure and elemental homogeneity of Prussian blue analogues,a series of medium entropy transition metal phosphides(METMP)OER catalysts with high cost-effectivity,efficiency and stability were precisely prepared.Specifically,the METMP-based((FeCoNi)P/Ni_(2)P-NF)catalyst demonstrates exceptional performance with an overpotential of only 232 mV at 50 mA·cm^(-2)and a Tafel slope of 52.7 mV·dec^(-1),significantly superior to its less entropy counterparts and commercial RuO_(2-).Moreover,it even maintains stability at the industrial standard current density of 500 mA·cm^(-2)for over 200 h.Density functional theory(DFT)calculations indicates that the synergistic effect of Fe,Co,Ni modulates electronic structure of METMPs,which effectively reduces the energy barrier for the rate-determining HOO*formation step,thereby considerably enhancing catalytic activity.This work not only contributes to the fundamental understanding of the role of medium/high entropy in catalysis but also paves the way for the development of next-generation electrocatalysts for energy-related applications.
