Unadulterated carbon as robust multifunctional electrocatalyst for overall water splitting and oxygen transformation
Unadulterated carbon as robust multifunctional electrocatalyst for overall water splitting and oxygen transformation
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DOI：
10.1007/s12274-020-2622-2
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发表时间：
2020-01
期刊：
影响因子：
9.9
通讯作者：
F. Kong;Y. Qiao;Chaoqi Zhang;Xiao-hong Fan;A. Kong;Y. Shan
中科院分区：
文献类型：
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作者：
F. Kong;Y. Qiao;Chaoqi Zhang;Xiao-hong Fan;A. Kong;Y. Shan
利用廉价、丰富的资源开发高效、耐用的非贵金属电催化剂对燃料电池、金属-空气电池等能量转换和储存技术的广泛应用具有重要意义。本文采用硼酸-水热法和热解法制备了具有多种本征缺陷活性位的海绵状纯碳管-石墨烯复合物（D/G-CTs-1,000）。D/G-CTs-1,000中开放的纳米管与少层石墨烯之间的紧密接触或接合构成了具有丰富通道、较大表面积和出色导电性的分级网络。结果表明，所制备的D/G-CTs-1，000电催化剂对氧还原反应（ORR）、析氧反应（OER）和析氢反应（HER）表现出优异的三功能电催化性能。使用D/G-CTs-1，000作为电极材料的一次锌空气电池和整体水分解系统提供了优于先进的Pt/C基电池的更高功率密度，以及与使用非贵金属/碳基材料作为电极的电池相当的整体水分解性能。本工作为制备高活性、长寿命的纯碳三功能电催化剂提供了一种通用、高效的合成策略，促进了无金属电催化剂在可持续能源转换技术中的广泛应用。
Developing the highly efficient and durable non-precious metal electrocatalysts by taking advantage of inexpensive and abundant resources is of paramount importance for the widespread application of energy conversion and storage techniques such as fuel cells and metal-air batteries. Herein, the sponge-like unadulterated carbontube-graphene complexes (D/G-CTs-1,000) with multifarious intrinsic defect active sites are fabricated by boric acid-hydrothermal and pyrolysis treatments. The close contact or juncture between open nanotubes and few-layer graphene in D/G-CTs-1,000 constructs the hierarchical networks with plentiful channels, the larger surface area and outstanding conductivity. As a result, the as-prepared D/G-CTs-1,000 electrocatalyst exhibits an excellent trifunctional electrocatalytic performance for oxygen reduction reaction (ORR), oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). The primary Zn-air batteries and overall water splitting system using D/G-CTs-1,000 as the electrode materials delivers higher power density outperforming the advanced Pt/C-based batteries and the overall water splitting performance comparable to those using the non-precious metal/carbon-based materials as electrode. This work provides a universal and efficient synthetic strategy to produce the unadulterated carbons with high activity and long-time durability as trifunctional electrocatalysts and promote the widespread applications of metal-free electrocatalysts in sustainable energy conversion technology.