Tuning the selectivity of NH 3 oxidation via cooperative electronic interactions between platinum and copper sites by Chen, L, Guan, X, Fei, Z, Asakura, H, Zhang, L, Wang, Z, Su, X, Yao, Z, Keenan, LL, Hayama, S, van Spronsen, MA, Karagoz, B, Held, G, Allen, CS, Hopkinson, DG, Decarolis, D, Callison, J, Dyson, PJ, Wang, FR