Co Nanoparticles/Co, N, S Tri-doped Graphene Templated from In Situ -Formed Co, S Co-doped g-C3N4 as an Active Bifunctional Electrocatalyst for Overall Water Splitting
Co Nanoparticles/Co, N, S Tri-doped Graphene Templated from In Situ -Formed Co, S Co-doped g-C3N4 as an Active Bifunctional Electrocatalyst for Overall Water Splitting
复制标题
以原位形成的 Co、S 共掺杂 g-C3N4 为模板的 Co 纳米粒子/Co、N、S 三掺杂石墨烯作为全水分解的活性双功能电催化剂
DOI：
10.1021/acsami.7b08138
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发表时间：
2017
影响因子：
9.5
通讯作者：
Cao Fei-Fei
中科院分区：
文献类型：
--
作者：
Zhang Geng;Wang Ping;Lu Wang-Ting;Wang Cao-Yu;Li Yong-Ke;Ding Cong;Gu Jiangjiang;Zheng Xin-Sheng;Cao Fei-Fei
开发富含稀土元素的高性能裂解电催化剂是提高其成本效益的关键。本文以蔗糖、尿素、硝酸钴和硫粉为原料，采用简单的热解方法合成了无贵金属的双功能电催化剂。在制备过程中，首先制备了Co，S共掺杂的石墨化碳氮化物(g-C3N4)，然后在随后的热解过程中，这个原位形成的模板进一步诱导了Co，N，S三掺杂石墨烯与Co纳米粒子(NPs)的耦合生成。研究了热解温度(700℃、800℃和900℃)对最终产物物理性能和电化学性能的影响。由于包覆了Co纳米粒子的石墨烯层数的增加，碳基质的石墨化度较高，以及存在分层的大/中观孔，在900℃下制备的复合电催化剂具有最好的析氢反应(HER)和析氧反应(OER)活性，并具有优异的长期耐久性。本工作为利用原位模板制备非贵金属基碳复合材料提供了一种简便的方法，也为今后的研究和应用展示了一种潜在的双功能电催化剂。
The development of high-performance electrocatalyst with earth-abundant elements for water-splitting is a key factor to improve its cost efficiency. Herein, a noble metal-free bifunctional electrocatalyst was synthesized by a facile pyrolysis method using sucrose, urea, Co(NO3)2and sulfur powder as raw materials. During the fabrication process, Co, S co-doped graphitic carbon nitride (g-C3N4) was first produced, and then this in-situ-formed template further induced the generation of a Co, N, S tri-doped graphene coupled with Co nanoparticles (NPs) in the following pyrolysis process. The effect of pyrolysis temperature (700, 800, and 900 °C) on the physical properties and electrochemical performances of the final product was studied. Thanks to the increased number of graphene layer encapsulated Co NPs, higher graphitization degree of carbon matrix and the existence of hierarchical macro/meso pores, the composite electrocatalyst prepared under 900 °C presented the best activity for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) with outstanding long-term durability. This work presented a facile method for the fabrication of non-noble-metal-based carbon composite from in-situ-formed template and also demonstrated a potential bifunctional electrocatalyst for the future investigation and application.