Fabricating Core-Shell WC@C/Pt Structures and its Enhanced Performance for Methanol Electrooxidation
Fabricating Core-Shell WC@C/Pt Structures and its Enhanced Performance for Methanol Electrooxidation
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DOI：
10.1063/1674-0068/30/cjcp1703026
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发表时间：
2017-09
影响因子：
1
通讯作者：
Zhao-yang Chen;L. Duan;Y. Chu;Jiangfeng Sheng;Wen-Feng Lin;Chun’an Ma
中科院分区：
文献类型：
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作者：
Zhao-yang Chen;L. Duan;Y. Chu;Jiangfeng Sheng;Wen-Feng Lin;Chun’an Ma
在800℃下，采用喷雾干燥法制备的W/铂多层分离球可通过典型的碳化生成机理制备出离散的核壳WC@C/铂催化剂。与以往的WC/铂合成研究不同，本文所观察到的反应在600℃下通过间接退火机理进行，物种扩散，从而形成核壳结构，铂纳米粒子在尺寸/形状上成功地分散在原位生成的C球上并随机分散。然而，通过直接碳化或在较高的初始氢氯铂酸浓度下，并未观察到与核壳微球的完全反应。间接渗碳减少了碳化钨颗粒较大的键所感受到的应变，并允许碳在碳化钨和铂纳米颗粒周围的运动被保留，影响了对甲醇氧化的电催化性能和稳定性。
The spray-dried spheres within a W/Pt multi-separation can be used to prepare discrete core-shell WC@C/Pt catalysts through a typical carburization production mechanism at 800 °C. In contrast with previous studies of the WC/Pt synthesis, the reaction observed here proceeds through an indirect annealing mechanism at 600 °C wherein species diffuse, thereby resulting in core-shell structure, and Pt nanoparticles were successfully dispersed in size/shape and randomly scattered across the in situ produced C spheres. Through direct carburization or at higher initial hydrochloroplatinic acid concentrations, however, complete reaction with core-shell spheres was not observed. Indirect carburization reduces the strain felt by the bonds featuring the larger WC particles and allows the motion of carbon around WC and Pt nanoparticles to be reserved, influencing the electrocatalytic performance and stability toward methanol oxidation.