以NaH_2PO_2和Ni_2SO_4为磷源和镍源,使用一锅法合成了非晶态NiP合金及其碳纳米(乙炔黑和石墨烯)复合催化剂。用透射电子显微镜(TEM)、X射线衍射仪(XRD)、热重分析(TGA)、电感耦合等离子体光谱仪(ICP)分别对催化剂性能和组成进行了表征...以NaH_2PO_2和Ni_2SO_4为磷源和镍源,使用一锅法合成了非晶态NiP合金及其碳纳米(乙炔黑和石墨烯)复合催化剂。用透射电子显微镜(TEM)、X射线衍射仪(XRD)、热重分析(TGA)、电感耦合等离子体光谱仪(ICP)分别对催化剂性能和组成进行了表征和分析。通过线性扫描伏安对催化剂在酸性和碱性条件下的析氢性能进行了评价,研究结果表明,非晶态NiP/还原氧化石墨烯复合催化剂(NiP/RGO)展现出优异的电催化性能。在0.5 mol/L H_2SO_4中的起始过电位为89.0 m V,塔菲尔斜率为135.1 m V/decade;在1 mol/L NaOH中,起始过电位为116.1 m V,塔菲尔斜率为122.4 m V/decade,这与商业化Pt黑催化剂很接近。500次循环以后,催化剂活性没有明显下降,表明该催化剂具有良好的稳定性。该研究提供了一种简单可行的制备非贵金属磷化物方法用于电催化析氢反应。展开更多
Developing cost-effective electrocatalysts for oxygen evolution reaction (OER) in basic media is critical to hydrogen production from renewable energy. Herein, in-situ electrodeposited flower-like NiFeO x H y and NiFe...Developing cost-effective electrocatalysts for oxygen evolution reaction (OER) in basic media is critical to hydrogen production from renewable energy. Herein, in-situ electrodeposited flower-like NiFeO x H y and NiFeO x H y /rGO composite electrocatalysts on Ni foam for OER are reported. The active sites of the flower-like electrocatalysts are increased significantly due to the enhanced NiFeO x H y surface areas and numerous exposed layered edges and edge defects. Reduced graphene oxide (rGO) has been introduced to fabricate NiFeO x H y /rGO composite film, further improving the conductivity and OER performance of the flower-like NiFeO x H y . The optimized NiFeO x H y /rGO exhibits superior OER performance with a Tafel slope of 29.11 mV/decade, an overpotential of 200 mV at 10 mA/cm 2 in 1 mol/L KOH and favorable long-term stability.展开更多
基金Natural Science Foundation of Shanxi(201901D111310,201801D221057)the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi Province(2020L0478,2021L388)Natural Science Foundation of Datong(2019160).
基金Natural Science Foundation of Shanxi(201901D111310,201801D221057)Postgraduate Educational reform and research program in Shanxi province(2022YJJG255)Natural Science Foundation of Shanxi Datong University(2022K23).
基金supported by National Natural Science Foundation of China(21073113)Natural Science Foundation of Shanxi(201701D121016)+1 种基金Science,Technology Innovation Project of Shanxi Province University(2015178,2016172)Natural Science Foundortion of Datong(2015108)
文摘以NaH_2PO_2和Ni_2SO_4为磷源和镍源,使用一锅法合成了非晶态NiP合金及其碳纳米(乙炔黑和石墨烯)复合催化剂。用透射电子显微镜(TEM)、X射线衍射仪(XRD)、热重分析(TGA)、电感耦合等离子体光谱仪(ICP)分别对催化剂性能和组成进行了表征和分析。通过线性扫描伏安对催化剂在酸性和碱性条件下的析氢性能进行了评价,研究结果表明,非晶态NiP/还原氧化石墨烯复合催化剂(NiP/RGO)展现出优异的电催化性能。在0.5 mol/L H_2SO_4中的起始过电位为89.0 m V,塔菲尔斜率为135.1 m V/decade;在1 mol/L NaOH中,起始过电位为116.1 m V,塔菲尔斜率为122.4 m V/decade,这与商业化Pt黑催化剂很接近。500次循环以后,催化剂活性没有明显下降,表明该催化剂具有良好的稳定性。该研究提供了一种简单可行的制备非贵金属磷化物方法用于电催化析氢反应。
文摘Developing cost-effective electrocatalysts for oxygen evolution reaction (OER) in basic media is critical to hydrogen production from renewable energy. Herein, in-situ electrodeposited flower-like NiFeO x H y and NiFeO x H y /rGO composite electrocatalysts on Ni foam for OER are reported. The active sites of the flower-like electrocatalysts are increased significantly due to the enhanced NiFeO x H y surface areas and numerous exposed layered edges and edge defects. Reduced graphene oxide (rGO) has been introduced to fabricate NiFeO x H y /rGO composite film, further improving the conductivity and OER performance of the flower-like NiFeO x H y . The optimized NiFeO x H y /rGO exhibits superior OER performance with a Tafel slope of 29.11 mV/decade, an overpotential of 200 mV at 10 mA/cm 2 in 1 mol/L KOH and favorable long-term stability.
