MQ Sensors

I have a project that consist of 3 mq7 sensors on Arduino Uno. My problem is getting to power up these sensors, the mq7 needs 5v and 150mA. Does using Arduino sensor shield will help me? Thank you

A shield will not help. You need an external power supply, capable of 5V and 1 Ampere to be safe. People often use phone chargers.

Don't forget to connect the grounds.