Citation: SUN Dun, HE Jian-Ping, ZHOU Jian-Hua, WANG Tao, DI Zhi-Yong, DING Xiao-Chun. Galvanic Replacement Strategy for a Core-Shell Like Ni-Pt Electrocatalyst with High Pt Utilization[J]. Acta Physico-Chimica Sinica, 2010, 26(05): 1219-1224. doi: 10.3866/PKU.WHXB20100507
电化学置换法制备高Pt利用率的类核壳型Ni-Pt电催化剂
采用电化学置换法, 在Vulcan XC-72表面制备得到了活性高和分散性好的纳米Ptshell-Nicore电催化剂. 该方法先以NaH2PO2为还原剂, 化学沉积得到Ni核, Pt在Ni核表面通过原位置换形成Ni-Pt类核壳型结构. 通过透射电镜(TEM)、X射线衍射(XRD)、紫外-可见光光谱(UV-Vis)和循环伏安(CV)测试证明了Pt壳层完全包覆在Ni核的表面. 电化学氢吸/脱附测试结果显示, Ptshell-Nicore/XC-72的电化学活性面积为Pt/C(JM)的1.2倍, 而其理论Pt担载量只为Pt/C (JM)的40%. 这表明, 核壳型Ni-Pt纳米粒子可以显著提高Pt的催化活性和利用率.
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关键词:
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电催化剂
- / Ptshell-Nicore/XC-72
- / 类核壳结构
- / Pt利用率
English
Galvanic Replacement Strategy for a Core-Shell Like Ni-Pt Electrocatalyst with High Pt Utilization
A highly active and well-dispersed nanoscale Ptshell-Nicore/XC-72 electrocatalyst was synthesized. The Ni-core was reduced by NaH2PO2, followed by an in situ galvanic replacement to yield a Ni-Pt core-shell like structure. Complete coverage of the Ni core by a Pt shell was confirmed by various techniques including transmission electron microscopy (TEM), X-ray diffraction (XRD), UV-visible (UV-Vis) spectrophotometry, and cyclic voltammetry (CV). A probe reaction of hydrogen electrooxidation showed that the electrocatalytically active surface area of Ptshell-Nicore/XC-72 is 1.2 times as large as that of Pt/C (JM), even though its theoretical Pt loading is only 40% that of Pt/C (JM). This improvement in activity is attributed to the interaction between the Pt shell and the Ni core.
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Key words:
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Electrocatalyst
- / Ptshell-Nicore/XC-72
- / Core-shell like structure
- / Pt utilization
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