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An amorphous carbon nitride/NiO/CoN-based composite: a highly efficient nonprecious electrode for supercapacitors and the oxygen evolution reaction.
Nanoscale ( IF 5.8 ) Pub Date : 2020/02/04 , DOI: 10.1039/d0nr00001a Huifang Yang 1 , Haoran Guo , Kanglei Pang , Peidong Fan , Xinpan Li , Wenlu Ren , Rui Song
Nanoscale ( IF 5.8 ) Pub Date : 2020/02/04 , DOI: 10.1039/d0nr00001a Huifang Yang 1 , Haoran Guo , Kanglei Pang , Peidong Fan , Xinpan Li , Wenlu Ren , Rui Song
Affiliation
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Due to their features of low cost, good corrosion resistance and environmental friendliness, transition metal oxides/nitrides are among the most promising materials for energy storage and conversion. Meanwhile, graphitic carbon nitride is a non-metallic polymer that has been widely used in the environmental and energy conversion fields due to its abundant precursor species and simple process of synthesis. In this study, an amorphous carbon nitride/NiO/CoN-based composite (Ni-Co-CN) is in situ fabricated via simple one-step pyrolysis; it displays high capacitive performance and efficient electrocatalytic capability for the oxygen evolution reaction (OER). Specifically, the optimized Ni-Co-CN electrode shows an ultra-high areal specific capacitance of 18.8 F cm-2 at 2 mA cm-2 in 3 M KOH electrolyte, and it retains 91.4% of its areal specific capacitance even after 10 000 cycles of CV scans. Upon being used as an electrocatalyst in the OER process, the overpotential of Ni-Co-CN can reach 195 mV versus a reference hydrogen electrode (RHE) at 10 mA cm-2, which is far lower than those of most reported Ni/Co-based catalysts. Additionally, the potential loss of Ni-Co-CN electrode is less than 1% after a long-term durability test over 60 h. The experimental results integrated with density functional theoretical calculations reveal that the excellent performance of the Ni-Co-CN self-supported electrode can be ascribed to the fast redox reduction of multi-valent transition metal ions, abundant surface defects and plentiful nano-scaled porous structures. This work provides a promising strategy for exploring methods to combine economic Ni/Co-based compounds with carbon-based materials to obtain low-cost yet efficient electrode materials for electrochemical energy storage and conversion.
中文翻译：
一种基于氮化碳/ NiO / CoN的无定形复合材料：一种用于超级电容器和氧释放反应的高效非贵金属电极。
由于其低成本，良好的耐腐蚀性和环境友好性，过渡金属氧化物/氮化物是用于能量存储和转换的最有前途的材料之一。同时，石墨氮化碳是一种非金属聚合物，由于其丰富的前体种类和简单的合成工艺，已广泛用于环境和能量转换领域。在这项研究中，通过简单的一步热解原位制备了非晶态氮化碳/ NiO / CoN基复合材料（Ni-Co-CN）。它显示出高的电容性能和对氧释放反应（OER）的有效电催化能力。具体而言，优化的Ni-Co-CN电极在3 M KOH电解质中的2 mA cm-2处显示18.8 F cm-2的超高面积比电容，并且保留91。即使经过1万次CV扫描，其面积比电容仍为4％。在OER工艺中用作电催化剂后，相对于参比氢电极（RHE）在10 mA cm-2时，Ni-Co-CN的过电势可以达到195 mV，这远低于大多数报道的Ni / Co的电势。基催化剂。此外，经过60小时的长期耐久性测试后，Ni-Co-CN电极的电势损失小于1％。结合密度泛函理论计算的实验结果表明，Ni-Co-CN自支撑电极的优异性能可归因于多价过渡金属离子的快速氧化还原，表面缺陷丰富和纳米级多孔。结构。
更新日期：2020-04-03
中文翻译：
一种基于氮化碳/ NiO / CoN的无定形复合材料：一种用于超级电容器和氧释放反应的高效非贵金属电极。
由于其低成本，良好的耐腐蚀性和环境友好性，过渡金属氧化物/氮化物是用于能量存储和转换的最有前途的材料之一。同时，石墨氮化碳是一种非金属聚合物，由于其丰富的前体种类和简单的合成工艺，已广泛用于环境和能量转换领域。在这项研究中，通过简单的一步热解原位制备了非晶态氮化碳/ NiO / CoN基复合材料（Ni-Co-CN）。它显示出高的电容性能和对氧释放反应（OER）的有效电催化能力。具体而言，优化的Ni-Co-CN电极在3 M KOH电解质中的2 mA cm-2处显示18.8 F cm-2的超高面积比电容，并且保留91。即使经过1万次CV扫描，其面积比电容仍为4％。在OER工艺中用作电催化剂后，相对于参比氢电极（RHE）在10 mA cm-2时，Ni-Co-CN的过电势可以达到195 mV，这远低于大多数报道的Ni / Co的电势。基催化剂。此外，经过60小时的长期耐久性测试后，Ni-Co-CN电极的电势损失小于1％。结合密度泛函理论计算的实验结果表明，Ni-Co-CN自支撑电极的优异性能可归因于多价过渡金属离子的快速氧化还原，表面缺陷丰富和纳米级多孔。结构。
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