Edge Article
Chemical Science
(GGA+U) with PBE functional.21 The energy cutoff is set to 600
J. M. Wang, L. Liu, J. Q. Zhang and C. N. Cao, Chem.
Commun., 2011, 47, 3469.
8 (a) M. W. Kanan and D. G. Nocera, Science, 2008, 321, 1072;
eV, and the atomic positions are allowed to relax until tꢀh1e
energy and force are less than 10ꢀ4 eV and 5 ꢃ 10ꢀ3 eV A
,
˚
´
respectively. The on-site repulsion is treated within Dudarev's
approach, where the on-site Coulomb repulsion (Hubbard U)
and the atomic-orbital intra-exchange energy (Hund's param-
eter J) are simplied to one parameter Ueff (Ueff ¼ U ꢀ J ¼ 2.0 eV).
The porous Co3O4 atomically-thin sheets were simulated by
periodically repeating the CoO layers along the [001] direction
of the unit cell. Each sheet model has the thickness of half a
unit cell along the [001] direction and is separated by a vacuum
(b) R. D. L. Smith, M. S. Prevot, R. D. Fagan, Z. P. Zhang,
P. A. Sedach, M. K. J. Siu, S. Trudel and C. P. Berlinguette,
Science, 2013, 340, 60; (c) W. D. Chemelewski, H. C. Lee,
J. F. Lin, A. J. Bard and C. B. Mullins, J. Am. Chem. Soc.,
´
2014, 136, 2843; (d) R. D. L. Smith, M. S. Prevot,
R. D. Fagan, S. Trudel and C. P. Berlinguette, J. Am. Chem.
Soc., 2013, 135, 11580; (e) J. D. Blakmore, N. D. Schley,
G. W. Olack, C. D. Incarvito, G. W. Brudvig and
˚
˘
region of 15 A. An elliptical pore area by removing partial Co
R. H. Crabtree, Chem. Sci., 2011, 2, 94; (f) M. Dinca,
and O atoms on the ultrathin sheet was used to simulate the
pore. The comparison calculations for bulk Co3O4 were per-
formed within supercells constructed from a standard unit cell
of the Co3O4 lattice.
Y. Surendranath and D. G. Nocera, Proc. Natl. Acad. Sci. U.
S. A., 2010, 107, 10337; (g) I. Zaharieva, P. Chernev,
M. Risch, K. Klingan, M. Kohlhoff, A. Fischer and H. Dau,
Energy Environ. Sci., 2012, 5, 7081.
9 (a) Y. F. Sun, Z. H. Sun, S. Gao, H. Cheng, Q. H. Liu, J. Y. Piao,
T. Yao, C. Z. Wu, S. L. Hu, S. Q. Wei and Y. Xie, Nat. Commun.,
2012, 3, 1057; (b) J. B. Zhu, L. F. Bai, Y. F. Sun, X. D. Zhang,
Q. Y. Li, B. X. Cao, W. S. Yan and Y. Xie, Nanoscale, 2013, 5,
5241.
Acknowledgements
This work was nancially supported by National Natural
Science Foundation (21331005, 11079004, 90922016, 21201157,
11321503), Chinese Academy of Science (XDB01020300), 10 Y. F. Sun, H. Cheng, S. Gao, Q. H. Liu, Z. H. Sun, C. Xiao,
Program for New Century Excellent Talents in University (NCET-
13-0546) and Fundamental Research Funds for the Central
Universities (WK2310000022).
C. Z. Wu, S. Q. Wei and Y. Xie, J. Am. Chem. Soc., 2012,
134, 20294.
11 (a) B. Radisavljevic, A. Radenovic, J. Brivio, V. Giacometti and
A. Kis, Nat. Nanotechnol., 2011, 6, 147; (b) Y. F. Sun, S. Gao
and Y. Xie, Chem. Soc. Rev., 2014, 43, 530.
12 (a) S. Ithurria, M. D. Tessier, B. Mahler, R. P. S. M. Lobo,
B. Duberttret and A. L. Efros, Nat. Mater., 2011, 10, 936; (b)
C. Schliehe, B. H. Juarez, M. Pelletier, S. Jander,
D. Greshnykh, M. Nagel, A. Meyer, S. Foerster,
A. Kornowski, C. Klinke and H. Weller, Science, 2012, 329,
550.
Notes and references
1 (a) Y. F. Sun, H. Cheng, S. Gao, Z. H. Sun, Q. H. Liu, Q. Liu,
F. C. Lei, T. Yao, J. F. He, S. Q. Wei and Y. Xie, Angew. Chem.,
Int. Ed., 2012, 51, 8727; (b) S. Y. Reece, J. A. Hamel, K. Sung,
T. D. Jarvi, A. J. Esswein, J. J. H. Pijpers and D. G. Nocera,
Science, 2011, 334, 645.
2 (a) J. Rosen, G. S. Hutchings and F. Jiao, J. Am. Chem. Soc., 13 (a) Y. Shi, Y. Wan and D. Zhao, Chem. Soc. Rev., 2011, 40,
2013, 135, 4516; (b) A. Kudo and Y. Miseki, Chem. Soc. Rev.,
2009, 38, 253.
3854; (b) J. S. Chen, T. Zhu, X. H. Yang, H. G. Yang and
X. W. Lou, J. Am. Chem. Soc., 2010, 132, 13162.
3 (a) Y. Zhao, R. Nakamura, K. Kamiya, S. Nakanishi and 14 (a) Z. L. Zhang, Z. Y. Tang, N. A. Kotov and S. C. Glotzer, Nano
K. Hashimoto, Nat. Commun., 2013, 4, 2390; (b) M. R. Gao,
Y. F. Xu, J. Jiang, Y. R. Zheng and S. H. Yu, J. Am. Chem.
Soc., 2012, 134, 2930.
4 (a) M. G. Walter, E. L. Warren, J. R. Mckone, S. W. Boettcher,
Q. Mi, E. A. Santori and N. S. Lewis, Chem. Rev., 2010, 110,
Lett., 2007, 7, 1670; (b) Z. Y. Tang, Z. L. Zhang, Y. Wang,
S. C. Glotzer and N. A. Kotov, Science, 2006, 314, 274.
15 C. Z. Yuan, L. Yang, L. R. Hou, J. Y. Li, Y. X. Sun, X. G. Zhang,
L. F. Shen, X. J. Lu, S. L. Xiong and X. W. Lou, Adv. Funct.
Mater., 2012, 22, 2560.
6446; (b) J. Wang, H. X. Zhong, Y. L. Qin and X. B. Zhang, 16 (a) Y. F. Sun, Z. H. Sun, S. Gao, H. Cheng, Q. H. Liu, F. C. Lei,
Angew. Chem., Int. Ed., 2013, 52, 5248.
5 (a) M. M. Najafpour, T. Ehrenberg, M. Wiechen and P. Kurz,
Angew. Chem., Int. Ed., 2010, 49, 2233; (b) N. S. McCool,
S. Q. Wei and Y. Xie, Adv. Energy Mater., 2014, 4, 1300611; (b)
Y. F. Sun, J. B. Zhu, L. F. Bai, Q. Y. Li, X. Zhang, W. Tong and
Y. Xie, Inorg. Chem. Front., 2014, 1, 58.
D. M. Robinson, J. E. Sheats and G. C. Dismukes, J. Am. 17 (a) Y. Y. Liang, Y. G. Li, H. L. Wang, J. G. Zhou, J. Wang,
Chem. Soc., 2011, 133, 11446.
T. Regier and H. J. Dai, Nat. Mater., 2011, 10, 780; (b)
Y. Y. Liang, H. L. Wang, J. G. Zhou, Y. G. Li, J. Wang,
T. Regier and H. J. Dai, J. Am. Chem. Soc., 2012, 134, 3517;
(c) A. J. Esswein, M. J. McMudo, P. N. Ross, A. T. Bell and
T. D. Tilley, J. Phys. Chem. C, 2009, 113, 15068; (d)
6 (a) F. Jiao and H. Frei, Angew. Chem., Int. Ed., 2009, 48, 1841;
(b) J. Wu, Y. Xue, X. Yan, W. S. Yan, Q. M. Cheng and Y. Xie,
Nano Res., 2012, 5, 521; (c) F. Jiao and H. Frei, Energy Environ.
Sci., 2010, 3, 1018; (d) C. Z. Yuan, L. Yang, L. R. Hou,
L. F. Shen, X. G. Zhang and X. W. Lou, Energy Environ. Sci.,
2012, 5, 7883.
7 (a) Y. Xu, R. Yi, B. Yuan, X. F. Wu, M. Dunwell, Q. L. Lin,
L. Fei, S. G. Deng, P. Andersen, D. H. Wang and H. M. Luo,
J. Phys. Chem. Lett., 2012, 3, 309; (b) Y. Q. Fan, H. B. Shao,
¨
¨
H. Tuysuz, Y. J. Hwang, S. B. Khan, A. M. Asin and
P. D. Yang, Nano Res., 2013, 6, 47; (e) N. H. Chou,
P. N. Ross, A. T. Bell and T. D. Tilley, ChemSusChem, 2011,
4, 1566.
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