石榴状N、P共掺杂的Mo_2C@C纳米球在碱性介质中的电催化析氢

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• 英文论文题名：Pomegranate-Like N,P-doped Mo_2C@C Nanospheres as Highly Active Electrocatalysts for Alkaline Hydrogen Evolution
• 论文作者：陈裕雲 ; 张云 ; 江文杰 ; 张星 ; 胡劲松 ; 戴志晖 ; 万立骏
• 英文论文作者：Yu-Yun Chen ; Yun Zhang ; Wen-Jie Jiang ; Xing Zhang ; Jin-Song Hu ; Zhihui Dai ; Li-Jun Wan ; Institute of Chemistry ; Chinese Academy of Sciences
• 年：2016
• 作者机构：中国科学院化学研究所;
• 论文关键词：碳化钼 ; 析氢反应 ; 电催化 ; 纳米球
• 会议召开时间：2016-07-01
• 会议录名称：中国化学会第30届学术年会摘要集-第四十二分会：能源纳米材料物理化学
• 语种：中文
• 分类号：TB383.1;O643.36
• 学会代码：ZGHY
• 会议名称：中国化学会第30届学术年会-第四十二分会 ; 能源纳米材料物理化学
• 会议地点：中国辽宁大连
• 主办单位：中国化学会
• 学会名称：中国化学会
• 页数：1
• 文件大小：141k
• 原文格式：D
• 会议级别：全国

摘要

磷钼酸引发聚合吡咯单体再经热解制备出石榴状N、P共掺杂Mo_2C@C纳米球。聚合物骨架中存在分子尺寸的PMo_(12)有利于石榴状Mo_2C@C纳米球的形成,其中,多孔碳层作为"石榴"皮,高度分散的Mo_2C纳米晶作为"石榴"籽。得益于这样独特的纳米结构,Mo_2C@C纳米球用于析氢反应(HER)具有以下优势:1、导电的氮掺杂碳层和基底有效防止Mo_2C纳米晶的聚集与电荷的传输;2、大量的N、P共掺杂Mo_2C@C纳米晶提供丰富的催化活性位点;3、介孔结构利于质量转移。因此,该石榴状N、P共掺杂Mo_2C@C纳米球展现出优异的HER电催化活性:在1 M KOH中10 mA cm~(-2)对应的过电位仅有47 mV,是目前报道的钼基HER催化性能最好的催化剂之一。
Well-defined pomegranate-like N,P-doped Mo_2C@C nanospheres were prepared by simply using phosphomolybdic acid(PMo_(12)) to initiate the polymerization of polypyrrol(PPy) and as a single source for Mo and P to produce N, P-doped Mo_2C nanocrystals. The existence of PMo_(12) at molecular scale in the polymer network allows the formation of pomegranate-like Mo_2C@C nanospheres with porous carbon shell as peel and Mo_2C nanocrystals well-dispersed in carbon matrix as seeds. This unique nanostructure provides several favorable features for hydrogen evolution reaction(HER): 1) conductive N-doped carbon shell and matrix effectively prevent the aggregation of Mo_2C nanocrystals and facilitate the electron transportation, 2) plenty of N, P-doped Mo_2C nanocrystals provide abundant catalytically highly active sites, and 3) mesoporous structure allows effective mass transfer. As a result, the pomegranate-like Mo_2C@C nanospheres exhibit extraordinary electrocatalytic activity for HER in terms of an extremely low overpotential of 47 mV at 10 mA cm~(-2) in 1 M KOH, which is one of the best Mo-based HER catalysts.

引文

[1]Chen,Y.;Zhang,Y.;Jiang,W.;Zhang,X.;Hu,J.*;Dai,Z.*;Wan,L.*;Submitted