It was expected that the Nexus 5 would work with the old Nexus Wireless Charging Orb that was sold for a while on the Google Play Store, but it was never officially confirmed by Google, likely because there is a new charging pad that is expected to be released that will be compatible with the Nexus 5 and Nexus 7. But, we can confirm that the Nexus 5 does work with the old Charging Orb...
Source: http://www.phonearena.com/news/Confirmed-the-Nexus-5-does-work-with-the-Nexus-Wireless-Charging-Orb_id49049
Source: http://www.phonearena.com/news/Confirmed-the-Nexus-5-does-work-with-the-Nexus-Wireless-Charging-Orb_id49049