The ST NFC Sensor app demonstrate the Energy Harvesting feature.
You can read data, in one shot mode, from any system running the FP-SNS-SMARTAG1 firmware package, like the STEVAL-SMARTAG1 evaluation board.

The energy harvesting feature of the embedded ST25DV series Dynamic NFC Tag means you can even deploy the STEVAL-SMARTAG1 without a battery and still read sensor data in one shot mode.

For more information, visit the STEVAL-SMARTAG1 and FP-SNS-SMARTAG1 web pages on www.st.com