TY - JOUR
T1 - Interconnected nanoparticle-stacked platinum-based nanosheets as active cathode electrocatalysts for passive direct methanol fuel cells
AU - Wang, Guoliang
AU - Jiang, Jingjing
AU - Huang, Qinghong
AU - Zhou, Yi
AU - Zou, Zhiqing
AU - Yang, Hui
N1 - Publisher Copyright:
© 2018
PY - 2018/11/1
Y1 - 2018/11/1
N2 - Interconnected nanoparticle-stacked two-dimensional Pt and porous PtNi alloy nanosheets are synthesized via galvanic replacement of Ni nanobelts. The Pt and porous PtNi nanosheets achieve a factor of approximately 1.3 and 2.3 enhancement in mass activity at 0.9 V versus RHE for oxygen reduction reaction relative to commercial Pt black, respectively. The practicability of Pt and porous PtNi nanosheets used as cathodic electrocatalysts for passive direct methanol fuel cells (DMFCs) is investigated. The passive DMFCs with Pt nanosheets (1.0 mg(Pt) cm−2) and porous PtNi nanosheets (0.8 mg(Pt) cm−2) exhibit excellent performance with satisfactory stability at 25 °C, which is slightly higher than that of the conventional cell with 2.0 mg(Pt) cm−2. The performance improvement of cells with Pt and porous PtNi nanosheets is attributed to the enhanced electrocatalytic activity and decreased charge transfer resistance of the cathodic catalyst layer. Benefiting from the porous structure of the PtNi nanosheets, the cell's performance is further boosted due to an increased Pt utilization. This work may provide an applicable approach to develop two-dimensional electrocatalysts for passive DMFCs, revealing a new strategy to decrease the usage of platinum.
AB - Interconnected nanoparticle-stacked two-dimensional Pt and porous PtNi alloy nanosheets are synthesized via galvanic replacement of Ni nanobelts. The Pt and porous PtNi nanosheets achieve a factor of approximately 1.3 and 2.3 enhancement in mass activity at 0.9 V versus RHE for oxygen reduction reaction relative to commercial Pt black, respectively. The practicability of Pt and porous PtNi nanosheets used as cathodic electrocatalysts for passive direct methanol fuel cells (DMFCs) is investigated. The passive DMFCs with Pt nanosheets (1.0 mg(Pt) cm−2) and porous PtNi nanosheets (0.8 mg(Pt) cm−2) exhibit excellent performance with satisfactory stability at 25 °C, which is slightly higher than that of the conventional cell with 2.0 mg(Pt) cm−2. The performance improvement of cells with Pt and porous PtNi nanosheets is attributed to the enhanced electrocatalytic activity and decreased charge transfer resistance of the cathodic catalyst layer. Benefiting from the porous structure of the PtNi nanosheets, the cell's performance is further boosted due to an increased Pt utilization. This work may provide an applicable approach to develop two-dimensional electrocatalysts for passive DMFCs, revealing a new strategy to decrease the usage of platinum.
KW - Electrocatalysis
KW - Membrane electrode assembly
KW - Oxygen reduction reaction
KW - Passive direct methanol fuel cell
KW - Two-dimensional nanosheet
UR - http://www.scopus.com/inward/record.url?scp=85053473597&partnerID=8YFLogxK
U2 - 10.1016/j.jelechem.2018.09.035
DO - 10.1016/j.jelechem.2018.09.035
M3 - 文章
AN - SCOPUS:85053473597
SN - 1572-6657
VL - 828
SP - 50
EP - 58
JO - Journal of Electroanalytical Chemistry
JF - Journal of Electroanalytical Chemistry
ER -