Can this cable charge USB-C devices?

Yes, this cable can charge USB-C devices using a wall charger, car charger, or power bank.

What is the maximum data transfer speed of the StarTech USB315CC1M cable?

The maximum data transfer speed of the StarTech USB315CC1M cable is up to 5Gbps.

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StarTech USB315CC1M USB C to UCB C Cable - 3 ft / 1m - M/M - USB 3.0 (5Gbps) - USB C Charging Cable - USB Type C Cable - USB-C to USB-C Cable

Connect USB-C devices
Connect a USB 3.0 device such as a portable hard drive or docking station to a USB-C computer
Thunderbolt 3 port compatible
Charge USB-C devices w/ a wall charger / car charger / power bank
Supports data transfer rates up to 5Gbps
Power USB-C enabled laptops w/ a USB-C wall charger
USB C Cable / USB Type C Cable / USB C Charging Cable / USB 3.1 Cable / USB315CC1M/ USB315CC / 3 ft / 3ft / 3 foot / 3 foot / 3 feet / 3feet / 3' / 3 ' / 1m / 1 m