Zhang Xiao, Yang Yuxiao, Guo Shengqi, Hu Fangzhong, Liu Lu
†Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering and ‡State Key Laboratory and Institute of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, P. R. China.
ACS Appl Mater Interfaces. 2015 Apr 29;7(16):8457-64. doi: 10.1021/acsami.5b00464. Epub 2015 Apr 15.
Mesoporous Ni0.85Se nanospheres grown on graphene were synthesized via the hydrothermal approach. Because of the exceptional electron-transfer pathway of graphene and the excellent catalytic ability of the mesoporous Ni0.85Se nanospheres, the nanocomposites exhibited excellent electrocatalytic property as the counter electrode (CE) of dye-sensitized solar cells. More catalytic active sites, better charge-transfer ability and faster reaction velocity of Ni0.85Se@RGO (RGO = reduced graphene oxide) CE led to faster and more complete I3(-) reduction than Pt, Ni0.85Se, and RGO CEs. Furthermore, the power conversion efficiency of Ni0.85Se@RGO CE reached 7.82%, which is higher than that of Pt CE (7.54%). Electrochemical impedance spectra, cyclic voltammetry, and Tafel polarization were obtained to demonstrate positive synergetic effect between Ni0.85Se and RGO, as well as the higher catalytic activity and the better charge-transfer ability of Ni0.85Se@RGO compared with Pt CE.
通过水热法合成了生长在石墨烯上的介孔Ni0.85Se纳米球。由于石墨烯具有优异的电子转移途径以及介孔Ni0.85Se纳米球具有出色的催化能力，该纳米复合材料作为染料敏化太阳能电池的对电极（CE）表现出优异的电催化性能。Ni0.85Se@RGO（RGO = 还原氧化石墨烯）对电极具有更多的催化活性位点、更好的电荷转移能力和更快的反应速度，导致其I3(-)还原比Pt、Ni0.85Se和RGO对电极更快且更完全。此外，Ni0.85Se@RGO对电极的功率转换效率达到7.82%，高于Pt对电极（7.54%）。通过电化学阻抗谱、循环伏安法和塔菲尔极化来证明Ni0.85Se和RGO之间的正协同效应，以及与Pt对电极相比，Ni0.85Se@RGO具有更高的催化活性和更好的电荷转移能力。
